Analysis Of Influence Parameters Of Steel Corrugated Plate‐Concrete Composite Arch Culvert,
2023
Shanxi Transportation Planning, Survey and Design Institute Co., Ltd., Taiyuan, Shanxi 030012, China
Analysis Of Influence Parameters Of Steel Corrugated Plate‐Concrete Composite Arch Culvert, Zhang Haijun
Journal of China & Foreign Highway
In order to explore the parameter effect of a composite arch culvert with corrugated steel plate and concrete, based on the engineering background of a composite arch culvert, the influence rules of four parameters, namely fill height, pipe diameter, wall thickness, and uneven settlement, on the stress and deformation of the arch culvert were analyzed based on the control variable method. The results show that the deformation and stress of the arch culvert are positively correlated with the fill height h and pipe diameter R. When h < 25 m, the deformation and stress increase linearly with the increase in the fill height, and when h > 25 m, the deformation and stress increase in a curve form. When R …
Research On Reasonable Completion State And Construction Stage Of Fenghuang Road Bridge,
2023
Chengdu Engineering Corporation Limited, Chengdu, Sichuan 610000, China
Research On Reasonable Completion State And Construction Stage Of Fenghuang Road Bridge, Chen Qiang, Gao Libao, Du Hongliang
Journal of China & Foreign Highway
In order to study the reasonable completion state of Fenghuang Road Bridge and analyze the construction stage, the finite element model was first established by Midas/Civil, and the correlation matrix was extracted. The minimum strain energy of Fenghuang Road Bridge was used as the objective function, and the mathematical optimization model was established by Matlab to determine the reasonable completion state and construction sequence of the bridge. To ensure reasonable cable force of the bridge, the construction cable force was solved by the forward assembly iteration, and the law of the construction cable force was basically the same as that …
Research On Damage Location Based On Time Reversal And Ultrasound‐Probability Imaging Algorithm,
2023
School of Civil Engineering, Changsha University of Science & Technology, Changsha, Hunan 410114, China
Research On Damage Location Based On Time Reversal And Ultrasound‐Probability Imaging Algorithm, Yin Xinfeng, Yang Jinyi, Zhang Ming
Journal of China & Foreign Highway
In order to study the location of structural damage, an improved time-reversal (TR)-based ultrasound-probabilistic imaging (TRPDI) algorithm was proposed in this paper. The electrical signal was applied to the piezoelectric ceramics (PZT) attached to the surface of the aluminium plate to generate an ultrasonic Lamb wave with good propagation performance in the aluminium plate. Based on Lamb wave theory and TR theory, the damage index was optimized, and the damage imaging algorithm was used to analyze the damage degree of the specimen and locate the damage. Three different data processing methods were used to obtain the active components in the …
Experiment Research Of High Pressure Jet Grouting Pile On Ultra‐Shallow Buried Tunnel In Strong Weathered Stratum,
2023
Guangdong Yunmao Expressway Co., Ltd., Guangzhou, Guangdong 510623, China
Experiment Research Of High Pressure Jet Grouting Pile On Ultra‐Shallow Buried Tunnel In Strong Weathered Stratum, Lu Liyang, Liu Huan, Li Pinpin
Journal of China & Foreign Highway
By taking the ultra-shallow buried construction of Xinwu Tunnel in Luoding–Xinyi Expressway in Guangdong Province as the engineering background, the key construction parameters and formation reinforcement effect of high-pressure rotary churning pile in ultra-shallow buried tunnel surrounding rock of fully weathered strata were compared. The results show that: ① slurry pressure, rotary churning speed, and lifting speed have obvious effects on the static load bearing capacity of a single pile. Under the same static load condition, greater slurry pressure indicates a lower cumulative settlement value of a single pile and a smaller increase in cumulative settlement value, and the change …
Study On Parameter Optimization Of Feet‐Lock Anchor Pipes Of Tunnels In Unconsolidated Formation,
2023
Nanjing Branch, CCCC Third Harbor Engineering Co., Ltd., Nanjing, Jiangsu 210011, China
Study On Parameter Optimization Of Feet‐Lock Anchor Pipes Of Tunnels In Unconsolidated Formation, Tang Heqing, Jiang Xishan, Yang Peng
Journal of China & Foreign Highway
In order to give full play to the supporting role of the feet-lock anchor pipe in the tunnel with unconsolidated formation, it is necessary to obtain the optimal construction parameters of the feet-lock anchor pipe. Based on a tunnel project on the Huaping–Lijiang Expressway in Yunnan Province, this paper conducted numerical simulation and field test analysis. By comparing the arch subsidence and horizontal convergence of the supporting structure when the feet-lock anchor pipe with different parameters was constructed, the paper explored the characteristics and causes of the influence of construction parameters on the feet-lock effect. The results show that the …
Simulation Study On Flame Retardant Effect Of Warm‐Mixed Flame Retardant Pavement In Highway Tunnel,
2023
Changsha University of Science and Technology
Simulation Study On Flame Retardant Effect Of Warm‐Mixed Flame Retardant Pavement In Highway Tunnel
Journal of China & Foreign Highway
In order to obtain the flame retardant effect of the warm-mixed flame retardant asphalt pavement in highway tunnels, based on the finite element method and thermodynamics theory, the thermal analysis module of Ansys finite element software was used to study the flame retardant effect of ordinary asphalt pavement, flame retardant asphalt pavement, and warm-mixed flame retardant asphalt pavement under different fire scales. The maximum temperature of the three types of pavement increased with the increase in the fire scale. Under any fire scale, the flame retardant effect of the warm-mixed flame retardant asphalt pavement was increased by 4.9%–8.5% compared with …
Study On Arrangement Law Of Grouting Bolt In Mountain Tunnel,
2023
Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 10607, China; 2. No. 3 Engineering Co., Ltd., China Railway 19th Bureau Group Corporation Limited, Shenyang, Liaoning 110136, China
Study On Arrangement Law Of Grouting Bolt In Mountain Tunnel, Zhao Licai
Journal of China & Foreign Highway
In the sandy soil area with abundant water content, grouted bolts can solve the problems of poor stability of surrounding rock and groundwater erosion in tunnel construction. However, the unreasonable arrangement of grouted bolts will cause the waste of slurry and fail to achieve the predetermined grouting effect. Based on the differential equation of slurry diffusion, this paper realized the numerical simulation of grouted bolts in a tunnel through software secondary development. Combined with mathematical statistics, the influence of the distance of grouted bolts, tunnel radius, and grouting time on the formation of grouting rings in mountain tunnels was studied. …
Experimental Study On The Diagonal Shear Of Asphalt Mixture At Micro‐Surfaces,
2023
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. National & Local Joint Engineering Research Center of Transportation and Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China
Experimental Study On The Diagonal Shear Of Asphalt Mixture At Micro‐Surfaces, Huang Weirong, Yang Yuzhu, Wang Cheng, Huang Feng, Yang Bo
Journal of China & Foreign Highway
A new 45° diagonal shear test was conducted to study the shear properties of the SBR-modified emulsified asphalt mixture at the micro-surface under the influence of different loading rates, different interface states, and different temperatures and water. The shear failure forms at the micro-surface at different temperatures were explained, and the effects of viscous layer oil, soil, and water on the shear strength at the micro-surface were analyzed. The results show that a faster loading rate at the micro-surface indicates higher shear strength. The shear failure mode of micro-surface at normal temperature is mainly an interlayer shear failure, while that …
Uniaxial Shear Test And Mesoscopic Numerical Simulation Of Cemental Soil Based On Pfc2d Method,
2023
Nanning Vocational and Technical University, Nanning, Guangxi 530003, China
Uniaxial Shear Test And Mesoscopic Numerical Simulation Of Cemental Soil Based On Pfc2d Method, Yang Zhihui, Li Shanhua
Journal of China & Foreign Highway
Uniaxial compression tests were carried out on stable soft soil samples with different cement contents. Based on the test results, a mesoscopic numerical simulation of PFC2D discrete element particle flow during soil sample deformation was conducted to analyze the mechanical behavior and displacement field distribution of cement soil after failure. The results show that with the increase in cement content, the uniaxial shear strength and elastic modulus of the solidified soft soil sample show an exponential function and rise, and the failure strain shows a quadratic function with the increase in cement content. The mechanical parameters and stress-strain curves of …
Study On Thermal Property Of Fast Growing Grass Fiber And Its Asphalt Mortar,
2023
Southern Green Road Research Institute, Central South University of Forestry & Technology, Changsha, Hunan 410004, China
Study On Thermal Property Of Fast Growing Grass Fiber And Its Asphalt Mortar, Xia Chaoming, Jiang Kang, Wu Chaofan, Liu Kefei
Journal of China & Foreign Highway
In order to investigate the thermal properties of fast-growing grass fiber and its asphalt mortar, the physical properties and thermal properties of bamboo fiber, reed fiber, and its asphalt mortar were tested and compared with those of lignin fiber and its asphalt mortar by physical property test, thermal weight loss test, and differential scanning calorimetry test. The results show that the addition of plant fiber can effectively improve the high temperature performance of asphalt, but it has a slight inhibition effect on the low temperature performance of asphalt. The quality loss of plant fiber in different temperature ranges is the …
Study On Pavement Performance Of Waterborne Epoxy Emulsified Asphalt And Its Application In Micro‐Surface,
2023
Hubei Liantou Exian Investment Co., Ltd., Ezhou, Hubei 436000, China
Study On Pavement Performance Of Waterborne Epoxy Emulsified Asphalt And Its Application In Micro‐Surface, Jiang Hai, Liu Dachang
Journal of China & Foreign Highway
In order to improve the pavement performance at micro-surface, waterborne epoxy resin was used to modify the emulsified asphalt, and the compatibility, microstructure, mechanical properties, rheological properties, and pavement performance of mixtures of the modified emulsified asphalt were studied. The storage stability test shows that the epoxy emulsion has good compatibility with emulsified asphalt. With the increase in waterborne epoxy resin content, the modified emulsified asphalt tends to form an epoxy resin-dominated skeleton structure. At the same time, with the increase in waterborne epoxy resin content, the adhesion and mechanical properties of emulsified asphalt and aggregate are significantly improved. At …
Evaluation Of Anti‐Cracking Performance Of Recycled Concrete With Recycled Rubber/Sbs Composite Modified Asphalt,
2023
Qinghai Xihu Expressway Management Co., Ltd., Xining, Qinghai 810000, China
Evaluation Of Anti‐Cracking Performance Of Recycled Concrete With Recycled Rubber/Sbs Composite Modified Asphalt, Li Xiaobin
Journal of China & Foreign Highway
In order to improve the crack resistance of recycled asphalt mixture, a new styrenic block copolymer (SBS)/rubber composite modified asphalt with excellent crack resistance was proposed for the regeneration of reclaimed asphalt pavement (RAP). Based on the creep of low temperature bending beam, confined temperature stress, and four-point bending fatigue test, the low temperature cracking resistance and fatigue cracking performance of composite modified asphalt and SBS-modified asphalt were studied. The results show that the addition of rubber can improve the low temperature and medium temperature crack resistance of recycled asphalt concrete, which may be related to the propagation of micro-cracks …
Study On Anti‐Scattering Performance Of Asphalt Concrete On Aggregate Scattering Pavement Of Highway,
2023
Zhejiang Communications Group Testing Technology Co., Ltd., Hangzhou, Zhejiang 310000, China
Study On Anti‐Scattering Performance Of Asphalt Concrete On Aggregate Scattering Pavement Of Highway, Yang Siyuan, Chen Guiliang
Journal of China & Foreign Highway
Due to the lack of quantitative evaluation methods for aggregate scattering degree of expressway asphalt pavement in China and abroad, according to the disease characteristics of surface layer spalling, this paper adopted the Cantabro standard dispersion test to sample the concrete of the section with aggregate scattering of Huangqunan Expressway (G3) in Zhejiang Province. The dispersion impact damage modes of the mixture with different severity were analyzed, and the anti-dispersion performance of concrete was evaluated by mass loss rate and water absorption rate. The results show that aggregate scattering will reduce the density of the concrete structure at the surface …
Study On The Effect Of Quicklime On The Properties Of Cold Mix Asphalt,
2023
Jiangxi Communications Investment Group Co., Ltd., Nanchang, Jiangxi 330025, China;
Study On The Effect Of Quicklime On The Properties Of Cold Mix Asphalt, Liu Tao, Yi Ming, Song Tao
Journal of China & Foreign Highway
The low initial strength of cold mixed asphalt mixture leads to the delay of traffic opening time, and the large void ratio leads to poor water stability and other problems, which seriously hinder the development of cold mixed environment-friendly construction mode. In this paper, based on the principle that the heat of quicklime in the presence of water promotes the rapid loss of water in the cold mixed mixture, the mixing test and cohesion test of the MS-3 slurry cold mixed asphalt mixture with quicklime were carried out to explore the influence of quicklime on the demulsification time and cohesion. …
Research On Design Process Of Toll Interchange‐Expressway In The Area Of Funiu Mountain,
2023
Henan Provincial Communications Planning & Design Institute Co., Ltd., Zhengzhou, Henan 450000, China
Research On Design Process Of Toll Interchange‐Expressway In The Area Of Funiu Mountain, Zhang Jie, Yang Qing, Chai Xiaolong
Journal of China & Foreign Highway
Currently, the expressways under construction in Henan Province are mainly concentrated in the Funiu Mountain area in the west, such as Yaoshan–Luanchuan–Xixia Expressway, Xixia–Xichuan Expressway, Yingchi–Luanchuan Expressway, and Luanchuan–Lushi Expressway. These projects are characterized by complex terrain conditions, difficult design, large-scale engineering, and a cluster of long tunnels and grand bridges. Under such complex conditions, how to arrange the interchange reasonably and ensure the optimal project plan becomes the key point of successful project design. This paper summarized the typical characteristics of toll interchange in Funiu Mountain area in recent years and put forward the design process of design preparation, …
Variable Speed Limit Control Method For Highway Under Dense Fog,
2023
School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
Variable Speed Limit Control Method For Highway Under Dense Fog, Sun Jiancheng, Qiao Jiaxing
Journal of China & Foreign Highway
In order to solve the problem of traffic safety on expressways under dense fog and change the original fixed speed limit measures, a variable speed limit control method based on the safe allowable speed was proposed. The speed limit value was calculated based on the regulations in road traffic safety law on the speed under dense fog by considering that the traffic law does not mention the road alignment conditions, road conditions, and other factors, and the monitor data was used to approximate replace the data of individual vehicles for data optimization, and the safe speed and safe distance of …
Study On Dynamic Allocation Optimization Of Highway Pavement Maintenance Funds,
2023
Jiangxi Ganyue Expressway Engineering Co., Ltd., Nanchang, Jiangxi 330069, China
Study On Dynamic Allocation Optimization Of Highway Pavement Maintenance Funds, Zou Yi
Journal of China & Foreign Highway
The conflict between the lack of maintenance funds and the growth of maintenance demand restricts the improvement of highway pavement technologies. In this paper, the state space of pavement maintenance demand was defined by the technical condition of the pavement, and the state of demand under different maintenance measures was designed as a Markov decision process. The dynamic allocation optimization model of highway pavement maintenance funds was established, and the corresponding genetic algorithm was designed. Finally, an example was given to simulate the optimized model. The results show that the Markov decision process can dynamically allocate highway pavement maintenance funds, …
The Calculation Theory Of Humidity For Subgrade ：A Perspective Review,
2023
Changsha University of Science and Technology
The Calculation Theory Of Humidity For Subgrade ：A Perspective Review
Journal of China & Foreign Highway
Subgrade humidity has a significant impact on its stiffness, deformation, and other properties. The theoretical calculation method of humidity field has always been one of the key issues in road engineering as a research method to evaluate its evolution law and mechanism. This paper reviewed and summarized the control equation of subgrade humidity calculation, hydraulic characteristics of unsaturated subgrade soil, and influencing factors of humidity. It was found that there were few studies on the coupling effects of multiple fields and factors such as stress, seepage, vegetation, and atmosphere in the whole calculation method system. It is suggested to carry …
Field Experiment On Deep Response Of Slope Subjected To Different Rainfalls In Plateau Mountainous Area Of Northwest Yunnan,
2023
Yunnan Institute of Transportation Planning and Design, Kunming, Yunnan 650041, China; 2. Yunnan Communications Investment & Construction Group Co., Ltd., Kunming, Yunnan 650103, China; 3. Yunnan Key Laboratory of Digital Transportation, Kunming, Yunnan 650000, China
Field Experiment On Deep Response Of Slope Subjected To Different Rainfalls In Plateau Mountainous Area Of Northwest Yunnan, Chen He, Lu Zhiqiang, Li Guo, Chen Zhengyu
Journal of China & Foreign Highway
In order to investigate the characteristics and mechanism of deep response of slopes subjected to different rainfalls in plateau mountainous area of Northwest Yunnan, remote real-time monitoring devices were deployed to carry out slope prototype field tests, analyze the effects of natural rainfalls in different forms and intensities on deep displacement and groundwater level changes, and put forward suggestions for landslide monitoring and early warning. The results show that the characteristics of heavy rainfall, steep slope, and rock fragmentation during flood season can induce the frequent fluctuation of groundwater level in the deeper part of the slope, which results in …
Experimental Study On Shear Strength Of Ehp Piles,
2023
Anhui Survey & Design Institute of Water Resources & Hydropower Co., Ltd., Hefei, Anhui 230088, China
Experimental Study On Shear Strength Of Ehp Piles, Wang Nanjiang, Liu Jianlong, Qiu Chengchun, Zhang Yuting, Tao Xiaoyu
Journal of China & Foreign Highway
The new environmental homogeneous plastic (EHP) pile improves the construction technology of traditional soil-cement mixing piles. It mixes the soil-cement slurry evenly in advance and then pours it into holes, so as to form piles with controllable physical properties. In order to test the strength of EHP piles, direct shear tests were carried out on field core sampling, field stirring sampling, and laboratory sampling, and the effects of pile depth, cement content, age, and curing conditions on shear strength were discussed. The test results show that the shear stress-displacement curve of the in-situ core sample is strain-softening; the shear strength …
