Stability Analysis Of High And Steep Bank Slope Of Jinqi Bridge On Wudang‑Changshun Expressway,
2024
China Railway First Survey and Design Institute Group Co ., Ltd., Xi’an，Shaanxi 710043 , China
Stability Analysis Of High And Steep Bank Slope Of Jinqi Bridge On Wudang‑Changshun Expressway, Wang Hao
Journal of China & Foreign Highway
Jinqi Bridge on the Wudang-Changshun Expressway in Guizhou Province crosses the Maotiao River，and the poor geological conditions such as dangerous rock mass and collapse accumulation body on the bank slope of the river are relatively developed，which seriously affects the site selection and safety of the bridge.In order to study the stability of the high and steep bank slope of the bridge，the paper explored the main poor geological conditions in the bridge site through a comprehensive air-ground investigation.By means of numerical analysis，InSAR，and other technologies，the movement range of dangerous rock mass on the bank slope was quantitatively evaluated.The stability and deformation mode …
Shear Creep Characteristics And Slope Deformation Mechanism Of Siliceous Slate,
2024
Hubei Communications Planning and Design Institute Co . Ltd., Wuhan , Hubei 430051 , China ;Hubei Provincial Engineering Research Center for Highway Geological Hazard Informatization and Intelligent Prevention and Control , Wuhan , Hubei 430051 , China
Shear Creep Characteristics And Slope Deformation Mechanism Of Siliceous Slate, Li Jian, Yan Liangyu, Yu Kaibing, Li Ming, Yan Tingzhou, Zhao Jia
Journal of China & Foreign Highway
To study the time-dependent creep effect of siliceous slate and the deformation and failure evolution law of high slope，in this paper，the shear creep test of indoor rock mass was carried out to plot the shear creep duration curves of siliceous slate under different normal stresses，the shear displacement-time curve，and the creep rate-time curve under different normal loads and shear loads.The average creep rate and shear load variation of siliceous slate were studied，and the long-term shear strength parameters of siliceous slate were determined by the steady-state creep rate method.The results show that in the creep test，the sensitivity of cohesion is significantly greater …
Rotating Wheel Tracking Tester And Torsional Resistance Of Asphalt Mixtures,
2024
Petroleum Processing Research Center , East China University of Science and Technology , Shanghai 200237，China ;Shanghai Urban Construction NichiReki Special Asphalt Co ., Ltd., Shanghai 2004 36，China
Rotating Wheel Tracking Tester And Torsional Resistance Of Asphalt Mixtures, Yao Hongru, Wang Qiang, Lu Guangyan, Zhou Xiaolong
Journal of China & Foreign Highway
Asphalt pavement is prone to pla stic deformation and aggregate raveling when it is in torsion.At present，there is no standard test method and equipment to evaluate the torsional resistance of asphalt mixtures.In order to study the effective evaluation method for the torsional shear resistance of asphalt mixtures，this paper introduced the structures and working principles of three kinds of equipment developed in Japan.The torsional resistance of five typical asphalt mixtures was evaluated by rotating wheel tracking tests，and factors affecting the torsional resistance of asphalt mixtures were analyzed.The results show that the types of structures and binders of asphalt mixtures have an …
Construction Of Carbon Emission Monitoring And Management System For Commercial Vehicles,
2024
Research Institute of Highway Ministry of Transport ，Beijing 100088，China
Construction Of Carbon Emission Monitoring And Management System For Commercial Vehicles, Chang Zheng, Song Yan, Ji Meichen, Liu Yuqing, Wang Jing
Journal of China & Foreign Highway
To construct a comprehensive carbon emission monitoring and management system for commercial vehicles，firstly，this article described the background and significance of carbon emission monitoring and management of commercial vehicles and summarized the research in relevant fields in China and abroad.Then，this article expounded on the carbon emission monitoring system for commercial vehicles，which covered three major levels：monitoring target layer，monitoring implementation layer，and monitoring summary layer，so as to achieve comprehensive and accurate carbon emission monitoring.Finally，combined with the carbon emission monitoring data of commercial vehicles，this article put forward a carbon emission management system for commercial vehicles based on data information，including carbon emission data sharing and opening，data …
Experimental Study On Reinforced Geogrid Of Construction And Demolition Wastes Based On Dic Technology,
2024
China Road & Bridge Corporation , Beijing 100011 , China
Experimental Study On Reinforced Geogrid Of Construction And Demolition Wastes Based On Dic Technology, Tan Peng, Li Hai, Li Xiangping, Gu Fan, Zhang Junhui
Journal of China & Foreign Highway
In order to control differential settlement caused by new and old subgrade connections after expressway reconstruction and expansion，this paper proposed a layered treatment structure for the loose steps of the old road with high water content.A layer of construction and demolition waste was laid on the step surface of the old road to wrap the geogrid.The treatment effect was compared with that of sand wrapping and lime mixing，and the digital speckle correlation （DIC） was used to observe the reinforced influence zone，so as to determine the thickness of different layers of the subgrade wrapped by construction and demolition wastes.The particle rotation …
Working Performance Of Rigid Airfield Runway Considering Influence Of Cavity Depth,
2024
School of Transportation Science and Engineering , Civil Aviation University of China , Tianjin 300300 , China ;Shandong Engineering Research Center of Civil Aviation Digital Innovation , Taian , Shandong 271000 , China
Working Performance Of Rigid Airfield Runway Considering Influence Of Cavity Depth, Dai Xuan, Li Zhao, Cai Jing, Li Yue, Liu Guoguang, Qi Lin
Journal of China & Foreign Highway
In order to analyze the influence of cavity depth on runway safety，a numerical simulation was carried out using the finite difference method.A total of 208 sets of different working conditions were designed by taking into account factors such as different aircraft types，runway dimensions，and cavity depth and area.Based on the runway life model considering the exponential decay of the structural condition，an analytical method was proposed to evaluate the impact of the cavity on the runway life.The results show that the bending and stress of the runway increase gradually with the increase in the cavity depth，but the growth rate is getting slower …
Intelligent Compaction Of Asphalt Pavement And Its Key Influencing Factors,
2024
Zhejiang Transportation Group Expressway Quzhou Management Center , Quzhou，Zhejiang 324000 , China
Intelligent Compaction Of Asphalt Pavement And Its Key Influencing Factors, Zhu Huifang, Wang Liang
Journal of China & Foreign Highway
Intelligent compaction，as a new type of road construction quality monitoring and management technology，has been widely used in the compaction process of asphalt pavement.However，due to the lack of understanding of the compaction process and the interaction mechanism between asphalt mixture particles，the problems of over-compaction and non-uniformity of compaction often occur in the actual construction，which seriously affects the quality of road construction and service performance.In this study，through the combination of the engineering field and indoor tests，the variation characteristics of asphalt mixture compaction with the number of compaction were analyzed by using the semi-variance function of the geostatistical model，and the effect of temperature …
Influence Of Lateral Constraint Conditions And Compactness On Compression Characteristics Of Compacted Loess In Northern Shaanxi,
2024
Yulin Highway Bureau , Yulin，Shaanxi 719199 , China
Influence Of Lateral Constraint Conditions And Compactness On Compression Characteristics Of Compacted Loess In Northern Shaanxi, Chang Yinghong, Zhao Jinpeng, Zhang Xiaozhou, Yang Hao, Li Zhe, Shao Dengfeng, Liu Lulu
Journal of China & Foreign Highway
In recent years，with the rapid development of road engineering construction，subgrade settlement caused by vertical compression of compacted loess has become increasingly serious.The previous research on the deformation of compacted loess mostly focuses on moisture content，porosity，saturation，and other aspects，ignoring the influence of lateral constraint conditions and different compaction on compacted loess.To address these issues，based on the reconstruction and expansion project of G 307 road in northern Shaanxi，this paper selected compacted soil samples of subgrade on site to carry out indoor compression tests.By applying different lateral constraint conditions，the stress-strain curves of compacted loess subjected to vertical multistage load under different compactness and confining …
Performance Of Composite Modified Permeable Concrete With Nano‑Silicon And Polypropylene Fiber,
2024
Shandong Road & Bridge Construction Group Co ., Ltd., Jinan , Shandong 250000 , China
Performance Of Composite Modified Permeable Concrete With Nano‑Silicon And Polypropylene Fiber, Liu Benli, Zhang Peng, Shan Jingsong, Zhao Haijian, Su Benjun, Li Chao
Journal of China & Foreign Highway
In order to improve the comprehensive performance of permeable concrete，nano-silicon and polypropylene fiber were added to permeable concrete to study the performance of the composite modified permeable concrete.Firstly，the influence of single-doped nano-silicon on the performance of cement paste and permeable concrete was studied，and the content of nano-silicon and the optimal water-to-binder ratio were determined.On this basis，different proportions of polypropylene fiber were mixed，and the reasonable content of polypropylene fiber was determined.The results show that nano-silicon improves the porosity of permeable concrete and increases the optimal water-to-binder ratio.When the content of nano-silicon is 0.5%，and the water-to-binder ratio is 0.32，the compressive strength of …
Oxygen Diffusion Behavior In Asphalt Film Based On Molecular Dynamics Simulation,
2024
Zhangjiagang Municipal Transportation Bureau , Zhangjiagang ，Jiangsu 215638，China
Oxygen Diffusion Behavior In Asphalt Film Based On Molecular Dynamics Simulation, Zhang Yu, Li Zheng, Fang Long, Han Bo, Wang Weicheng, Mao Zigen, Liu Qi, Yu Bin
Journal of China & Foreign Highway
Asphalt aging is one of the most important concerns during the use of asphalt pavement.However，asphalt usually exists in the form of a film in the mixture.Oxygen diffusion is an important factor affecting asphalt aging.To investigate the oxygen diffusion behavior in asphalt film under different working conditions，an oxygen-asphalt-aggregate （OAA） model was developed in this study to simulate the state of the asphalt film on the aggregate surface under real conditions.Oxygen diffusion and asphalt component migration in the OAA model were investigated under different conditions of time，temperature，oxygen concentration，and aggregate type.The influence of each factor on the molecular behavior of the model was …
Force Analysis Of Open Web Triangular Area Of Ganxi Super Bridge During Construction,
2024
CCCC Second Highway Engineering Co ., Ltd.，Xi’an, Shaanxi 710065，China
Force Analysis Of Open Web Triangular Area Of Ganxi Super Bridge During Construction, Sun Keqiang, Li Baifu, Xue Qilin
Journal of China & Foreign Highway
Ganxi Super Bridge is an open web continuous rigid frame bridge with a main span of 300 m，and the upper chord box girder in the open web triangular area adopts the post support of a few telescopic columns with the hanging basket for suspension casting.The lower chord box girder adopts the full cable-stayed buckle method with a hanging basket for suspension casting.To analyze the force characteristics of the temporary structural system in the triangular area during the construction process using this method，the force variation law during the construction process of the temporary structural system in the triangular area was summarized …
Value Of Effective Length Coefficient Of Pier Of Long‑Span Continuous Rigid Frame Bridge,
2024
China Railway Eryuan Engineering Group Co ., Ltd., Chengdu ，Sichuan 610031 , China
Value Of Effective Length Coefficient Of Pier Of Long‑Span Continuous Rigid Frame Bridge, Tang Like, Song Suidi, Zhang Yang
Journal of China & Foreign Highway
The effective length coefficient of a pier is a controlling factor affecting the safety and economic index of bridge structures.The values of the effective length coefficient of compression members in Chinese and foreign codes are basically similar，and they are only applicable to ideal boundary conditions.In practical application，it is necessary to make appropriate adjustments according to the specific structural form.In order to get the value closer to the actual situation of the structure，this paper analyzed the overall stability of the structure and investigated the influence laws of different factors on the effective length coefficient of the continuous rigid frame bridge in …
Calculation Of Slag Weight In Shield Construction Based On Compound Continuous Belt Conveyor,
2024
China Railway 16th Bureau Group Road and Bridge Engineering Co ., Ltd., Beijing 101500 , China
Calculation Of Slag Weight In Shield Construction Based On Compound Continuous Belt Conveyor, Zhou Biao, Ding Xiaobin, Sun Wenjian, Ren Xufeng
Journal of China & Foreign Highway
Based on the construction data of continuous belt conveyors in shield construction，this paper evaluates two common calculation methods of slag weight （slag weight calculation based on loosening coefficient and slag weight calculation based on external additives ） to accurately manage slag in shield construction.According to the law of slag discharged from each ring in shield construction，an improved slag weight estimation method in shield construction was proposed.The results show that there is a big error in the slag weight calculation based on the loosening coefficient.When slag weight calculation based on external additives is used，the calculated value is always smaller than the …
Comparative Study On Dynamic Effect Of Basic Longitudinal Section Alignment,
2024
Tongji Architectural Design (Group ) Co., Ltd., Shanghai 200092 , China
Comparative Study On Dynamic Effect Of Basic Longitudinal Section Alignment, Du Yongping, Wang Peng
Journal of China & Foreign Highway
To improve the alignment in the old road reconstruction project，stress analysis was carried out，and the alignment and smoothness parameters were used as the major variables in the dynamic equation.A “human-vehicle-road ” dynamic analysis model was established，and alignment comparison groups were set，with only one group set with easing vertical curves.The Newmark- β method was used for programming and calculating the dynamic effects generated by the basic alignment with a radius of 7 000 m.The vibration indicators such as peak acceleration，root mean square of acceleration，vibration period，and frequency were used to analyze the dynamic effects of the basic alignment group.By analyzing the causes …
Mechanism Of Anti‑Collision Guardrails To Snow Drift Disasters On Highways,
2024
Xilingol League Qiantu Traffic Design Co ., Ltd., Xilinhot , Inner Mongolia 026000 , China
Mechanism Of Anti‑Collision Guardrails To Snow Drift Disasters On Highways, Peng Guodong, Xi Jianfeng, Zhang Siyuan, Li Min, Liu Ziwei, Xing Ruimin
Journal of China & Foreign Highway
With the continuous promotion of China ’s strategy of building the country with a strong transportation network，the proportion of high-grade highways in the road network continues to increase，and the number of traffic safety facilities is increasing.Xilingol League in the Inner Mongolia Autonomous Region has a long winter and strong wind，which is one of the typical areas in China deeply affected by snow drift disasters.Through field investigation，it is found that “road snow resistance ” “visual range obstacle ” and other snow drift disasters caused by traffic safety facilities are also increasingly prominent，which seriously restricts the effective play of road transportation functions …
Innovative Exploration For Green Construction Of Highway Bridges In Dense Urban Areas,
2024
China Academy of Transportation Sciences , Beijing 100029 , China
Innovative Exploration For Green Construction Of Highway Bridges In Dense Urban Areas, Liu Xuexin, Zeng Lei, Meng Yuanying, Hao Guojun, Chen Yao
Journal of China & Foreign Highway
In order to improve the green construction level of highways in dense urban areas，the project characteristics and engineering requirements of the Nansha-Zhongshan Expressway were analyzed，and the concept of green development was implemented in the whole life cycle of highway design，construction，operation，maintenance，and management.The research and development of ten innovative technologies in four categories were highlighted，including industrial intelligent construction of highway bridges，comprehensive utilization of highway resources，environmental protection of highways in coastal wet areas，and integrated design of transportation and tourism in the Guangdong-Hong Kong-Marco Greater Bay Area.Among them，the prefabricated beam annular production line and non-standard eight-lane were the unprecedented technologies first used in the …
Comparison Of Chinese ， Ame Rican， And Bangladeshi Criteria For Liquefaction Judgment O F Fine‑Grained Soil,
2024
Research and Development Center on International Engineering Standards , CCCC， Wuhan，Hubei 430056，China ;CCCC Second Highway Consultant Co., Ltd., Wuhan , Hubei 430056 , China
Comparison Of Chinese ， Ame Rican， And Bangladeshi Criteria For Liquefaction Judgment O F Fine‑Grained Soil, Wu Zi
Journal of China & Foreign Highway
The criteria for liquefaction judgment of fi ne-grained soil in current seismic design codes of China，the United States，and Bangladesh are quite different.In order to propose the judgment criteria for engineering application and Chinese code revision，this paper compared the judgment processes and criteria of the three countries.After analyzing the formation process，based on the application of the criteria for liquefaction judgment of 168 fine-grained soil samples collected in Dhaka，Bangladesh and surrounding cities，the rationality of each judgment process and criteria was evaluated comprehensively.Finally，a set of judgment processes and result criteria for fine-grained soil liquefaction integrating all criteria were put forward.
Bonding Performance Of Chip Seal Containing Waste Tire Rubber Particles,
2024
Hunan Provincial Communications Planning Survey & Design Institute Co ., Ltd., Changsha , Hunan 410200 , China
Bonding Performance Of Chip Seal Containing Waste Tire Rubber Particles, Chen Jianmin, Liu Donghai, Wang Jinyu, Liu Haozhi
Journal of China & Foreign Highway
In order to promote the reuse of waste tires and reduce environmental pollution，chips were replaced with the same volume of waste tire rubber particles to prepare a new rubber particle chip seal pavement.In order to ensure the bonding between asphalt and aggregate of the rubber particle chip seal，the surface of rubber particles was processed，and the texture characteristics of chip seal specimens with different aggregate particle sizes and rubber content were evaluated.The five indexes of rubber particle content，aggregate particle size ratio，shedding rate，structural depth，and pendulum friction coefficient were correlated and evaluated by SPSS，and the MMLS 3 test was conducted to simulate the …
Monetary Policy Impact On Stock Returns For Selected South Asian Countries,
2024
University of Sri Jayewardenepura - Sri Lanka
Monetary Policy Impact On Stock Returns For Selected South Asian Countries, Neluka Devpura, Paresh Kumar Narayan, Navin Perera
Bulletin of Monetary Economics and Banking
In this paper, we examine the monetary policy impact on the stock market returns and volatility for four major South Asian countries (Bangladesh, India, Pakistan, and Sri Lanka). We test our hypothesis that monetary policy influences both the first and second order of stock returns by using monthly data. The short-term interest rate and the Treasury bill rate are employed as proxies for monetary policy. Controlling for industrial production, inflation, exchange rates (vis-à-vis the US dollar), US interest rate, and money supply, our findings indicate that there exists a statistically significant impact of short-term interest rates on stock returns only …
Gender-Specific Mental Health Outcomes In Central America: A Natural Experiment,
2024
Ursinus College
Gender-Specific Mental Health Outcomes In Central America: A Natural Experiment, Thea Nagasuru
Computer Science Summer Fellows
While COVID lockdown measures have had varying effects on the mental health of different demographics, several bodies of research have noted their disparate effect on women. Why is women's mental health more negatively impacted by lockdown measures, and how much more are they impacted than men? How can we predict and mitigate these negative effects on women? This paper aims to contribute to answering those questions by comparing COVID stringency measures and their effect on the gap in depression rates between men and women in two neighboring countries: Nicaragua and Honduras.
