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Articles 301 - 330 of 623

Full-Text Articles in Materials Science and Engineering

Experimental Study On Static And Dynamic Mechanical Properties Of Pva Fiber‑Reinforced Coral Concrete, Zhou Jinyi, Long Zhilin, Guo Ruiqi, Kuang Dumin, Cai Yang, Chen Shasha, Chen Jinjie May 2024

Experimental Study On Static And Dynamic Mechanical Properties Of Pva Fiber‑Reinforced Coral Concrete, Zhou Jinyi, Long Zhilin, Guo Ruiqi, Kuang Dumin, Cai Yang, Chen Shasha, Chen Jinjie

Journal of China & Foreign Highway

To enhance the mechanical properties of coral concrete，static mechanical tests were conducted at five polyvinyl alcohol fiber volume fractions （0，0.5%，1%，1.5% and 2%）.The impact compression properties were investigated under four strain rates using a split Hopkinson pressure bar with a diameter of 100 mm.The results show that the incorporation of an appropriate number of fibers can significantly improve the static compressive strength and splitting tensile strength of concrete.Dynamic mechanical tests show that coral concrete has an obvious strain rate effect，and the incorporation of fibers can improve the sensitivity of the dynamic reinforcement factor to strain rate，with the reinforcement effect becoming saturated …

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Influence Of Warm‑Mixed Flame Retardant Technology On Construction Environment Of Asphalt Pavement In Long Tunnel, Xian Jianglin, Li Yanxiang, Yang Qingyang May 2024

Influence Of Warm‑Mixed Flame Retardant Technology On Construction Environment Of Asphalt Pavement In Long Tunnel, Xian Jianglin, Li Yanxiang, Yang Qingyang

Journal of China & Foreign Highway

With the long tunnel as the research object，the variation of volatile organic compound （VOC） volume fraction，CO volume fraction，and illuminance in the construction area of the middle of the tunnel under the conditions of hot mix technology and warm-mixed flame retardant technology was tested respectively，and the influence of warm-mixed flame retardant technology on the construction environment of asphalt pavement in long tunnels was analyzed and evaluated.The results show that when the pavement of a long tunnel adopts hot mix technology，the mass concentration of asphalt fume in the whole operation area is relatively high，and that in some areas exceeds the threshold value.The …

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Influence Of Concrete Barrier Slope Parameters On Protective Effect Against Vehicle Collision, Gong Shuai May 2024

Influence Of Concrete Barrier Slope Parameters On Protective Effect Against Vehicle Collision, Gong Shuai

Journal of China & Foreign Highway

In order to study the influence of concrete barrier slope parameters on the protective effect against vehicle collision，the vehicle models and concrete barrier models were established.The validity of these models was verified using the real vehicle test data.Then，the collision analysis was conducted on the single-slope concrete barrier with different slopes，improved concrete barrier with different slope parameter combinations，and reinforced concrete barrier with anti-climbing function by using the validated models，respectively.The results show that the slope is the key parameter that affects the protective performance of the single-slope barrier，and vehicles cannot be effectively protected if the slope is too small or too large.The …

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Evaluation Of Long‑Term Water Stability Of Acidic Diorite Asphalt Mixtures In Different Environments, Cao Zhonglu, Chen Ping, Liu Xuewen, Tan Bo May 2024

Evaluation Of Long‑Term Water Stability Of Acidic Diorite Asphalt Mixtures In Different Environments, Cao Zhonglu, Chen Ping, Liu Xuewen, Tan Bo

Journal of China & Foreign Highway

The short-term water stability of acidic diorite asphalt mixtures with acid-alkaline composite aggregates mixed with cement （2% cement instead of mineral powder ），slaked lime （30% slaked lime water for stone immersion ），and anti-spalling agent （modified asphalt with 0.3% anti-spalling agent ） was evaluated by Marshall test of immersion，freeze-thaw splitting test，and rutting test.Then，by repeated freeze-thaw splitting test，repeated freeze-thaw and baking splitting test，and repeated acid-etching freeze-thaw splitting test，the long-term water stability of the treated acidic diorite asphalt mixtures in different environments was tested.The results show that the physical and mechanical properties of acidic diorite meet the specification requirements；the short-term water stability of …

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Test And Analysis On Stress And Deformation Of Assembled Geocell Retaining Wall, Kong Yongbo, Li Hao, Zhang Jianwei, Li Junjie, Yang Xiaohua May 2024

Test And Analysis On Stress And Deformation Of Assembled Geocell Retaining Wall, Kong Yongbo, Li Hao, Zhang Jianwei, Li Junjie, Yang Xiaohua

Journal of China & Foreign Highway

The variable cross-section geocell retaining wall of the Chengdu –Yibin Expressway test road in Sichuan Province of China was studied.First，the construction method of the new-type assembled geocell retaining wall was introduced，and the new-type glass fiber reinforced plastic lightweight panel was used to effectively solve the problem that the panel of the retaining wall is not neat and easy to be damaged.Secondly，the supporting effect of the retaining wall was analyzed by field monitoring.The field monitoring results show that the earth pressure at different parts of the retaining wall is nonlinearly distributed along the height of the retaining wall.The earth pressure at …

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Reasearch On Fatigue Failure Law In Tension‑Shear Zone Behind Wheel In Rigid And Flexible Composite Pavement, Cheng Xiaoliang, Deng Fuhao, Wang Yang, Han Leilei, Zhou Wujun May 2024

Reasearch On Fatigue Failure Law In Tension‑Shear Zone Behind Wheel In Rigid And Flexible Composite Pavement, Cheng Xiaoliang, Deng Fuhao, Wang Yang, Han Leilei, Zhou Wujun

Journal of China & Foreign Highway

In order to study the slippage mechanism of asphalt concrete overlay on continuous reinforced concrete composite pavement （CRCP），the structure of the composite pavement was modeled using the elastic layered system，and the interlayer bonding state of the model was calibrated by the measured data of the road.In the analysis of interlayer mechanical behavior，it was found that when the horizontal force coefficient was 1，there existed a tension-shear zone behind the wheel，which may lead to the failure of this zone prior to the position of the maximum interlayer shear stress.Relevant test data analysis shows that when the horizontal force coefficient is 1，under the …

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Experimental Research On Anti-Uv Aging Performance Of Tire Pyrolysis Carbon Black （Tpcb） Modified Asphalt, Yang Wansheng, Yi Shuaibing, Dai Tianle, Li Tiantian, Gan Youwei May 2024

Experimental Research On Anti-Uv Aging Performance Of Tire Pyrolysis Carbon Black （Tpcb） Modified Asphalt, Yang Wansheng, Yi Shuaibing, Dai Tianle, Li Tiantian, Gan Youwei

Journal of China & Foreign Highway

To investigate the anti-ultraviolet （UV） aging performance of waste tire pyrolysis carbon black （TPCB）-modified asphalt，TPCB-modified asphalt was prepared and subjected to UV aging tests alongside the base asphalt at various intervals.The micro changes and surface roughness of two kinds of asphalt surfaces were studied by atomic force microscopy （AFM）.The behavior changes in ductility，softening point，and penetration of two asphalts before and after UV aging were tested by asphalt performance tests.The results show that the reduction height of TPCB-modified asphalt is smaller than that of base asphalt，and the surface roughness is larger than that of base asphalt at each time.The performance change …

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Structure And Material Of Rigid‑Flexible Composite Pavements And Development, Liu Zhaohui, Huang You, Yu Shiqing, Liu Jingyu, Li Sheng, Liu Li, Pan Yu May 2024

Structure And Material Of Rigid‑Flexible Composite Pavements And Development, Liu Zhaohui, Huang You, Yu Shiqing, Liu Jingyu, Li Sheng, Liu Li, Pan Yu

Journal of China & Foreign Highway

The rigid-flexible composite pavement，as a kind of durable pavement structure，has been widely used for heavy-duty traffic，special geological conditions，bridge tunnel paving，etc.In order to promote the application of durable rigid-flexible composite pavements and clarify the key research issues and development directions，relevant research progress of rigid-flexible composite pavements in China and abroad was reviewed.Based on the structure design theory and construction technology of rigid-flexible composite pavements，the structural mechanical behavior characteristics of rigid-flexible composite pavements were described，and the stress induced by load and temperature of asphalt surface layer and rigid base layer，as well as their interactions were analyzed.The asphalt surface layer on the rigid …

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Experimental Study On Double‑Mixture Solidification And Ratio Optimization Of Dredger Fill Sludge, Qin Liang, Chen Zhimin, Lu Yongfei May 2024

Experimental Study On Double‑Mixture Solidification And Ratio Optimization Of Dredger Fill Sludge, Qin Liang, Chen Zhimin, Lu Yongfei

Journal of China & Foreign Highway

In order to study the optimal r atio of cement and calcium oxide by double-mixture solidification for improving dredger fill sludge，the soil modification results by double-mixture solidification were analyzed based on orthogonal experiments.Finally，the fuzzy comprehensive evaluation method was used to quantitatively optimize each ratio scheme.The results show that：① Under the same addition ratio （addition amount of 1.0%‒4.0%），there is a positive linear correlation between the optimal moisture content and the addition amount，and there is a negative linear correlation between the optimal moisture content and the maximum dry de nsity.Under non-equal addition ratios，the law is not obvious.However，compared to cement，the water-reducing effect of …

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Road Performance Of Reclaimed Asphalt Mixture Mixed With Bagasse Fibers And Rubber‑Modified Asphalt, Jiang Xin May 2024

Road Performance Of Reclaimed Asphalt Mixture Mixed With Bagasse Fibers And Rubber‑Modified Asphalt, Jiang Xin

Journal of China & Foreign Highway

Given the potential resource value of rec laimed asphalt pavement，waste rubber powder，and bagasse fibers，it is meaningful to develop the cooperative utilization of various solid wastes.This paper studied the microstructure and thermal characteristics of bagasse fibers，carried out the mix design of a reclaimed asphalt mixture with bagasse fibers and rubber-modified asphalt，and evaluated its road performance.At the same time，the test road was paved successfully and observed for a time.The results show that the hollow lumen with multilayer fiber structure in bagasse fibers contributes to absorbing free asphalt in mixtures and enhances the adhesion between bagasse fibers and asphalt.The thermal properties of bagasse …

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Feasibility Of Sandstone Used In Asphalt Pavement Of Expressways, Lou Jianmin, Meng Xiandong, Song Zhike, Zhao Lidong, Bai Julong, Zhao Shengli, Zhu Jishuang May 2024

Feasibility Of Sandstone Used In Asphalt Pavement Of Expressways, Lou Jianmin, Meng Xiandong, Song Zhike, Zhao Lidong, Bai Julong, Zhao Shengli, Zhu Jishuang

Journal of China & Foreign Highway

In order to explore the feasibility of applying sandstone in the asphalt pavement of expressways，the physical and mechanical indexes of sandstone and limestone aggregate were compared，and the high temperature performance，low temperature performance，and water stability of asphalt mixture were studied from the aspects of grading type，asphalt type，and aggregate lithology.The results show that the road performance of asphalt mixture synthesized by clean and regular sandstone aggregate meets the requirements of current specifications.At the same time，the comprehensive road performance of sandstone asphalt mixture with 1% anti-stripping agent has been improved.

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Key Construction Techniques For Emended Cap Unsealed Bottom Of Deep‑Water Hard Rock, Zeng Jian, Guan Xiaohui, Guo Zhiwei May 2024

Key Construction Techniques For Emended Cap Unsealed Bottom Of Deep‑Water Hard Rock, Zeng Jian, Guan Xiaohui, Guo Zhiwei

Journal of China & Foreign Highway

In the construction of a deep-water embedded cap foundation，it was required to excavate the mud surface to the depth below sealing concrete and clean the bottom carefully，ensuring the height and quality of bottoming concrete.For hard rock under good geological conditions，there exist such problems as difficulty in excavation，long excavation time consumption，and high construction cost.Based on the construction of the main pier caps of the Chongqing Jiahua Metro Bridge，this paper adopted the method of combining theoretical analysis，numerical calculation，and engineering implementation verification，which developed an emended cap unsealed bottom key construction techniques for deep-water hard rock.This construction technology used the method of excavating the …

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Influence Of Blasting Point Position And Foundation Pit Height On Blasting Vibration During Foundation Pit Blasting Excavation, Liu Kuan, Xu Zhihao, Tang Yuan, Shen Jun, Bao Xiaohua, Shen Pinghuan, Ou Yang May 2024

Influence Of Blasting Point Position And Foundation Pit Height On Blasting Vibration During Foundation Pit Blasting Excavation, Liu Kuan, Xu Zhihao, Tang Yuan, Shen Jun, Bao Xiaohua, Shen Pinghuan, Ou Yang

Journal of China & Foreign Highway

In view of inaccurate vibration prediction of foundation pit blasting，the influence of blasting point position and foundation pit height on vibration during foundation pit blasting excavation was studied by using finite element simulation software.First，based on the foundation pit blasting excavation of the Mawan Cross-Sea Passage，a numerical simulation was carried out to verify the applicability of the model.Then，under unchanged blasting center distance，the distance from the blasting point to the edge of the foundation pit and the foundation pit height were changed respectively，and the influence of these two factors on surface vibration was studied.The results show that a greater distance from the …

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Excavation Method For Ⅴⅴ‑Grade Surrounding Rock Of Double‑Hole Eight‑Lane Super‑Long‑Span Tunnel, Shi Youzhi, Liu Xudong, Yong Jinzhu May 2024

Excavation Method For Ⅴⅴ‑Grade Surrounding Rock Of Double‑Hole Eight‑Lane Super‑Long‑Span Tunnel, Shi Youzhi, Liu Xudong, Yong Jinzhu

Journal of China & Foreign Highway

In order to reduce the adverse effect of back heading blasting on the completed supporting structure at the entrance of a double-hole eight-lane super-long-span tunnel with Ⅴ-grade surrounding rock，the Niuzhaishan tunnel project in Pingtan was taken as an example.The original design of the double-side heading method is easy to cause the collapse of the temporary steel support that has been completed when blasting happens near the back heading.In view of this，this paper put forward scheme 1 of canceling the temporary transverse support and the up-and-down step method with vertical support （scheme 2）.It then used the finite element method to calculate …

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Design And Evaluation Of Land‑Saving And Beautiful Median Barriers, Li Jingjun, Wa Ng Xin, Qi Jie, Wang Zijian, Liu Siyuan May 2024

Design And Evaluation Of Land‑Saving And Beautiful Median Barriers, Li Jingjun, Wa Ng Xin, Qi Jie, Wang Zijian, Liu Siyuan

Journal of China & Foreign Highway

During the construction and expansion of expressways and national and provincial highways，more diversified requirements have been put forward for the median barrier，including reliable protective performance，small footprints，beautiful traffic environments，and economic costs.However，the existing median barrier achievements still have some shortcomings.In order to better meet the design and use needs of median barriers for highways，theoretical analysis，computer simulation，and full-scale impact tests with real vehicles were adopted，and the force characteristics of different types of median barriers were analyzed.A new design concept of beam-column integration was put forward.Through systematic research on the barrier height，width，beam，column，foundation，and other structures，a land-saving and beautiful median barrier was developed.The median barrier had …

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Multi-Region Plane Fitting Algorithm For Texture Depth Of Asphalt Pavements, Zhu Feng, Feng Xingle, Wu Chuan, Lin Xiaoyong May 2024

Multi-Region Plane Fitting Algorithm For Texture Depth Of Asphalt Pavements, Zhu Feng, Feng Xingle, Wu Chuan, Lin Xiaoyong

Journal of China & Foreign Highway

The existing calculation methods for texture depth of asphalt pavements are easily affected by external and human factors.Therefore，a multi-region plane fitting algorithm for the texture depth based on three-dimensional （3D） linear laser data was proposed.The algorithm preprocessed the collected 3D height data matrix of the pavement and derived a slope-based adaptive filtering algorithm for point cloud data.Then, the 3D height matrix was divided into multiple regions，and the local extremum of the center point was determined.Finally，with the three-point and one-surface plane fitting algorithm as the core，the texture depth of asphalt pavements was calculated.The experimental results show that the correlation between this …

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Key Technology And Numerical Simulation Of Cast‑In‑Place Construction Of Main Arch Ring Of Reinforced Concrete Arch Bridge Based On Suspension Steel Arch Method, Su Xueping, Xia Zhengzhi, Lyu Songgang, Duan Pengjie, Lyu Yigang May 2024

Key Technology And Numerical Simulation Of Cast‑In‑Place Construction Of Main Arch Ring Of Reinforced Concrete Arch Bridge Based On Suspension Steel Arch Method, Su Xueping, Xia Zhengzhi, Lyu Songgang, Duan Pengjie, Lyu Yigang

Journal of China & Foreign Highway

Steel arch frame replaced such construction methods as floor bracket or segment cantilever assembly and it was applied to arch circle cast-in-place across deep water canyons in mountainous areas，which had certain advantages and was worth promoting and applying.By introducing the key construction technologies of Sanchahe Bridge，including steel arch frame cantilever fastener method assembly，arch water tank method precompression，and main arch ring layered pouring，the common problems in the construction process of crossing the deep water canyon were solved effectively.Based on Midas Civil overall modeling of finite elements，the key construction technologies adopted by the bridge were numerically simulated and analyzed，and the successful construction …

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Guardrail Improvement For Old Bridges In Expressways, Liu Xinping, Zhang Shihui, Shang Zhongping, Han Yue, Zhang Qiang May 2024

Guardrail Improvement For Old Bridges In Expressways, Liu Xinping, Zhang Shihui, Shang Zhongping, Han Yue, Zhang Qiang

Journal of China & Foreign Highway

In view of the insufficient protection grade of the guardrail in old bridges，a combined guardrail suitable for the low concrete wall guardrail in the old bridge was designed and developed by using finite element analysis while not damaging the main structure of the bridge.The protection grade was verified to reach SA grade through a full-scale vehicle collision test.The guardrail was designed with new high-strength alloy steel，with light weight and beautiful appearance.There was no need to dismantle the original concrete foundation in the old bridge，which is convenient for construction and requires low cost.Therefore，it is worth being popularized and applied in the …

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Improvement Of Gravelly Laterite And Cement Stable Disposal In West Africa, Jin Haibing, Yi Zicheng, Zhuo Rong May 2024

Improvement Of Gravelly Laterite And Cement Stable Disposal In West Africa, Jin Haibing, Yi Zicheng, Zhuo Rong

Journal of China & Foreign Highway

Owing to poor gradation and high liquid limit and plasticity index，the application of gravel laterite on road paving is limited in West Africa.To overcome this issue，laterite granule combined with sand at different content was explored.The performance including the particle composition，limit water content and CBR value was investigated.The results indicate that sand treatment can improve the gradation，enhance the compactness，and reduce the plasticity index.The improved gravel laterite can meet the requirements of subbase，cushion，and base courses.Cement treatment can improve the mechanical properties of laterite grains.Cement and sand content affect the unconfined compressive strength significantly，with an optimal sand content range identified.Specifically，laterite granules mixed with …

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Key Construction Techniques For Incremental Launching And High Falling Beam Of Long‑Span Simply Supported Steel Box Girder, Wu Yanbin, Lyu Maofeng, Yin Qijia, Yu Guanqiu Mar 2024

Key Construction Techniques For Incremental Launching And High Falling Beam Of Long‑Span Simply Supported Steel Box Girder, Wu Yanbin, Lyu Maofeng, Yin Qijia, Yu Guanqiu

Journal of China & Foreign Highway

Based on the overpass project over Beijing-Hong Kong-Macao Expressway on Changsha Pan-Pan Road，this paper proposed a construction method of large-slope walking-type incremental launching and high falling beam of steel box girder given the difficulties in busy traffic under the bridge，large pushing slope，and great total height of falling beam.After the steel box girder assembly was completed，some bridge deck ancillary facilities were constructed in advance in the preassembly yard and the weight was allocated.The steel box girder was pushed synchronously，thereby reducing the aerial work on the bridge in the later stage.During the incremental launching construction of the steel box girder above the …

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Different Forms Of Nano‑Sio2 In Emulsified Asphalt And Their Effects On Emulsion Storage Stability, Ji Chao, Cao Yuanhao, Li Zhigang Mar 2024

Different Forms Of Nano‑Sio2 In Emulsified Asphalt And Their Effects On Emulsion Storage Stability, Ji Chao, Cao Yuanhao, Li Zhigang

Journal of China & Foreign Highway

The insufficient storage performance of emulsified asphalt has always been a problem affecting its application，and there have been studies in China on nano-SiO2 particles as additives to improve the stability of emulsified asphalt，but the effect is not obvious.Based on the principle of Pickering emulsion，nano-SiO2 with surface modification was used as an emulsifier to directly emulsify matrix asphalt，and whether its stability improvement effect on emulsified asphalt is better than nano-SiO2 as a modified additive was explored.Firstly，three emulsified asphalt were prepared，namely ordinary modified emulsified asphalt A，emulsified asphalt B with nano-SiO2 as a modified additive，and emulsified asphalt C based on the new nano-SiO2 …

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Study On Test Methods Of Wheel Sticking‑Free Emulsified Asphalt, Wang Peng, Qin Yongchun, Wang Jie, Xiong Weiming, Chang Rong, Fu Chongfeng, Feng Guoli Mar 2024

Study On Test Methods Of Wheel Sticking‑Free Emulsified Asphalt, Wang Peng, Qin Yongchun, Wang Jie, Xiong Weiming, Chang Rong, Fu Chongfeng, Feng Guoli

Journal of China & Foreign Highway

The wheel sticking-free emulsified asphalt is a key material to solve the wheel sticking problem in the process of asphalt pavement construction，with the wheel sticking-free effect as the core index.The accurate evaluation of the wheel sticking-free effect is important for the popularization and application of wheel sticking-free emulsified asphalt.Based on the research results in China and abroad，two test methods for wheel sticking-free effects （counterweight method and indenter method ） were innovatively proposed，and the wheel sticking-free effects of various emulsified asphalt were evaluated.The test results show that the two test methods can accurately evaluate the wheel sticking-free performance of emulsified asphalt，and …

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Study On Mobilization Rate Of Rap Aged Asphalt Based On Ftir, Zou Xiaoyong, Li Ning, Wu Wenxiu, Wang Xin, Xu Xiaohe Mar 2024

Study On Mobilization Rate Of Rap Aged Asphalt Based On Ftir, Zou Xiaoyong, Li Ning, Wu Wenxiu, Wang Xin, Xu Xiaohe

Journal of China & Foreign Highway

During the preparation of the recycled asphalt mixture，part of the aged asphalt is first transferred from the surface of the recycled material to the new aggregate and then diffused and fused with the new asphalt，in which the percentage of transferred aged asphalt plays a key role in the final regeneration effect.In order to study the degree of transfer of aged asphalt in reclaimed asphalt pavement （RAP ），the mobilization rate （RMR） was calculated and analyzed based on the Fourier transform infrared spectroscopy （FTIR ）.The AC-13 graded recycled asphalt mixture was mixed and sieved to separate the new aggregate and RAP.The recycled …

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Deflection Variation Rule Of Main Girder For A Concrete Cable‑Stayed Bridge Based On Combined Static And Dynamic Modification, Li Qi, Qi D Ongchun, Yang Hu, Zhao Zhiguo Mar 2024

Deflection Variation Rule Of Main Girder For A Concrete Cable‑Stayed Bridge Based On Combined Static And Dynamic Modification, Li Qi, Qi D Ongchun, Yang Hu, Zhao Zhiguo

Journal of China & Foreign Highway

In order to solve the problem of continuous downward deflection of the main girder for a concrete cable-stayed bridge during its service life，the deflection variation of the main girder for a long-span concrete cable-stayed bridge during its service was analyzed based on the modified model.A dual-objective optimization problem was constructed by using the combined static and dynamic finite element model modification method and was solved by the non-dominated sorting genetic algorithm （NSGA- Ⅱ）.The Pareto optimal solution set was obtained，and the coordinated optimal solution was found in the Pareto optimal solution set，so as to modify the finite element model.The calculated values …

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Construction Technology Of Reactive Powder Concrete Prestressed Box Girder, Wang Xiaojie Mar 2024

Construction Technology Of Reactive Powder Concrete Prestressed Box Girder, Wang Xiaojie

Journal of China & Foreign Highway

At present，high-strength and high-performance concrete has some disadvantages，such as low flexural strength，large brittleness，and poor volume stability.Reactive powder concrete （RPC ） is a new type of material，which has good mechanical properties and high impermeability.It can reduce the amount of concrete to a greater extent and reduce the weight of the structure，achieving the purpose of safety，reliability，and cost saving.This paper applied RPC to highway prestressed box girder.Through the innovation and optimization of mix ratio，the change in traditional transportation technology，and curing technology research of steam curing shed，it effectively shortens the pouring time of RPC，ensuring the pouring quality and strength.

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Fragilit Y Analysis Of Continuous Rigid Frame Bridge With High Piers And Long Span Subjected To Near‑Field Earthquakes, Sun Yongjiang Mar 2024

Fragilit Y Analysis Of Continuous Rigid Frame Bridge With High Piers And Long Span Subjected To Near‑Field Earthquakes, Sun Yongjiang

Journal of China & Foreign Highway

Near-field earthquakes are more destructive to the continuous rigid frame bridge with high piers and long span.Based on a new-built continuous rigid frame bridge with high piers and long span，considering the seismic demand probability of bridges under near-field earthquakes，this paper utilized OpenSees to analyze the time history of the bridge.The structure response of the bridge under near-field earthquakes was obtained by the nephogram method，and the vulnerability of the bridge under earthquake was analyzed based on the curvature demand probability model of the structure.The results show that the probability response of curvature demand of a continuous rigid frame bridge with high …

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Lightweight Replacement Technology For Existing Soft Subgrade Based On Over‑Consolidated State, Huang Baotao, Zhang Mudan, Huang Xiangshuo, Fang Mingshan, Feng Jianxue, Huang Lizhen Mar 2024

Lightweight Replacement Technology For Existing Soft Subgrade Based On Over‑Consolidated State, Huang Baotao, Zhang Mudan, Huang Xiangshuo, Fang Mingshan, Feng Jianxue, Huang Lizhen

Journal of China & Foreign Highway

In order to solve the differential settlement of soft subgrade in coastal areas，based on the elastic deformation theory of overconsolidation stress ratio，the calculation and analysis of artificial overconsolidation stress ratio and the new technology of lightweight replacement were carried out to reduce the additional stress of vehicle load and structure weigh.The results show that the replacement thickness of the lightweight material with suitable density can make the additional stress at the bottom of the subgrade less than the deadweight stress of the original soft soil，and the additional stress is less than the initial flow stress of the soft soil.The resulting …

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Analysis Of Stress And Drainage Characteristics Of Water Film Between Tire And Road Surface And Influence Of Groove Parameters, Sun Zhenhao, Chen Jun Mar 2024

Analysis Of Stress And Drainage Characteristics Of Water Film Between Tire And Road Surface And Influence Of Groove Parameters, Sun Zhenhao, Chen Jun

Journal of China & Foreign Highway

In order to study the stress characterist ics of water film on cement concrete road surface under the action of the tire and the influence of grooves，the finite element model of tire-water film-road surface was constructed using SolidWorks and Ansys Workbench.Based on computational fluid dynamics （CFD ） control equation and fluid-structure coupling theory，the flow law of water film on road surface under the action of the tire and the influence of water film thickness，driving speed，groove width，groove spacing，and groove direction on the hydrodynamic lift of tire were analyzed.The results show that the hydrodynamic lift of the tire increases with the increasing …

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Influence Of Rap Content On Mechanical Properties And Pavement Performance Of Warm Recycled Asphalt Mixture, Ren Ruibo, Yin Liyang, Xu Qiang, Zhao Pinhui, Ma Shidong Mar 2024

Influence Of Rap Content On Mechanical Properties And Pavement Performance Of Warm Recycled Asphalt Mixture, Ren Ruibo, Yin Liyang, Xu Qiang, Zhao Pinhui, Ma Shidong

Journal of China & Foreign Highway

Warm recycling technology is an effective new technology for recycling recycled asphalt pavement （RAP ）.In order to improve the pavement performance of warm recycled asphalt and effectively enhance the recycling rate of RAP，the influence of RAP content on the performance of warm recycled asphalt mixture was investigated through mechanical properties and pavement performance analysis，and the correlation between dynamic stability and mechanical parameters of creep tests under repeated loading was discussed.The results show that with the increase in RAP content，the high-temperature stability，shear resistance，and elastic deformation resistance of warm recycled asphalt mixture are improved，but the low-temperature crack resistance and water stability are …

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Expressway Traffic Flow Prediction Based On Data From Multiple Related Toll Stations, Zhang Yang, Yao Fangyu, Yang Shumin Mar 2024

Expressway Traffic Flow Prediction Based On Data From Multiple Related Toll Stations, Zhang Yang, Yao Fangyu, Yang Shumin

Journal of China & Foreign Highway

The strong inter-economic connection makes a spatial correlation between traffic data from multiple related toll stations between urban cluster regions，and an accurate description of this connection can improve the accuracy of expressway traffic flow prediction.However，due to many uncertainties，the correlation is difficult to be captured and quantified.To solve this problem，an ATGCN-ResGRU deep learning-based expressway traffic flow prediction method was proposed.By combining attention mechanisms，three graph convolutional networks （GCN ） topological networks with high，medium，and low attention levels were constructed，and spatial learning data was obtained according to the weighted attention level of each network.The connection of multiple related toll stations was quantified and graded.At …

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