Study On Health State Evaluation Method Of Highway Tunnel Based On Neutrosophic Theory,
2023
School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China
Study On Health State Evaluation Method Of Highway Tunnel Based On Neutrosophic Theory, Deng Fayou, Xia Caichu, Xu Chongbang
Journal of China & Foreign Highway
The structural complexity and inherent uncertainties of highway tunnels necessitate comprehensive consideration of various uncertain factors to reasonably evaluate their health state. By introducing neutrosophic theory, which accounts for structural uncertainties, this paper proposes a health state evaluation method for highway tunnels based on neutrosophic cosine and tangent similarity measures. The proposed method was applied to evaluate the health state of 10 samples. A comparison between the actual evaluation grades and the results obtained using the proposed method shows that the evaluation results are consistent with the actual grades. This indicates that the proposed method effectively addresses uncertainties in the …
Interlayer Bonding Performance Of Wtr/Apao Composite Modified Asphalt,
2023
College of Civil Engineering, Hunan University, Changsha, Hunan 410082, China
Interlayer Bonding Performance Of Wtr/Apao Composite Modified Asphalt, Ji Hongyan, Yan Kezhen, Yuan Jian, Zhang Xuanyu
Journal of China & Foreign Highway
To investigate the bonding performance of waste tire rubber (WTR)/ amorphous α-olefin copolymer (APAO) composite modified asphalt as a waterproof bonding layer in asphalt pavements on cement concrete bridges, shear and pull-off tests were conducted. The shear strength and pull-off strength of SBS-modified asphalt, WTR-modified asphalt, and WTR/APAO composite modified asphalt were compared under different application rates and temperatures. The results show that WTR/APAO composite modified asphalt exhibits the best bonding performance, followed by WTR-modified asphalt, with SBS-modified asphalt performing the worst. Based on the shear and pull-off strengths at different temperatures, the optimal application rates were determined as 1.7 …
Optimization Study On Indoor Vibratory Compaction Curves Of Cement Stabilized Macadam,
2023
CCCC First Highway Consultants Co., Ltd., Xi’an, Shaanxi 710075, China; University of Science and Technology Beijing, Beijing 100083, China
Optimization Study On Indoor Vibratory Compaction Curves Of Cement Stabilized Macadam, Qiu Youqiang, Zhang Liujun
Journal of China & Foreign Highway
To obtain well-defined secondary convex vibratory compaction curves and reduce the need for supplemental compaction point tests, this paper uses vibratory compaction tests for cement stabilized macadam in laboratory settings. Tests were conducted for two pavement sections along National Highway 110 (Hohhot to Bikeqi), exploring the influence of predefined moisture content intervals on vibratory compaction curves under varying cement dosages. The vibratory compaction curves were also compared with heavy compaction curves for analysis. The results show that the vibratory compaction curve is significantly influenced by the predefined moisture content intervals and cement dosage. For a moisture content interval of 1%, …
Study On Treatment Of Karst Foundation By Dynamic Compaction,
2023
Hangzhou Transportation Investment and Construction Management Group Co., Ltd., Hangzhou, Zhejiang 310024, China
Study On Treatment Of Karst Foundation By Dynamic Compaction, Lyu Jiang, Zhao Hui, Yang Biao
Journal of China & Foreign Highway
Dynamic compaction is a commonly used method for treating karst foundations with cavities; however, the design parameters of dynamic compaction under different working conditions lack clear standards. This paper employs the finite element software Abaqus to simulate the effects of surrounding rock quality and karst roof thickness on the stability of karst cave roofs during dynamic compaction treatment. The results indicate that the vertical displacement and maximum tensile stress of karst cave roofs are negatively correlated with roof thickness. For Grade II and III surrounding rocks with better properties, no cave collapse occurred after dynamic compaction treatment. In contrast, for …
Research On Road Crack Recognition Model Based On Yolo V3 Deep Learning Algorithm,
2023
School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong 510000, China
Research On Road Crack Recognition Model Based On Yolo V3 Deep Learning Algorithm, Su Weiguo, Wang Jingxiao
Journal of China & Foreign Highway
To address the challenges of manual intervention in road crack detection and the inaccuracy of traditional recognition algorithms, this paper proposes a road crack recognition method based on the YOLO v3 deep learning algorithm. The dataset images were first resized to 416×416 pixels. Labelme was then used to annotate cracks in the images and convert the boundary box location information. Finally, the YOLO v3 algorithm framework was employed for model training. The results show that the YOLO v3 algorithm achieves precision, recall, and F1 scores above 95%, with an image detection speed of 0.123 seconds per image. The YOLO v3 …
Discussion On Formula Of Off‐Load Increase Coefficient Of Single‐Box Multi‐Cell Wide Girder,
2023
Harbin Institute of Technology, Harbin, Heilongjiang 150090, China
Discussion On Formula Of Off‐Load Increase Coefficient Of Single‐Box Multi‐Cell Wide Girder, Gao Qingfei, Wang Renzhi, Li Jun, Guo Binqiang, Qin Weijun
Journal of China & Foreign Highway
Single-box multi-cell wide girders are widely applied in highway and urban bridges due to their excellent integrity and large width, especially with increasing traffic volumes. However, existing methods for calculating the off-load increase coefficient of single-box multi-cell wide girders are either too complex or fail to meet engineering needs, limiting their applicability in preliminary design. This paper explores eight influencing factors of the off-load increase coefficient, calculates the coefficients using the transverse frame method, and proposes an empirical formula for the off-load increase coefficient. The proposed formula is validated using the Xiushui Street Wide Girder Bridge in Jilin City.
Study On Modification Of Phosphate Pretreated Aggregate Vegetation Porous Concrete,
2023
Shanxi Transportation Holdings Group Co., Ltd., Taiyuan, Shanxi 030000, China
Study On Modification Of Phosphate Pretreated Aggregate Vegetation Porous Concrete, Li Zhengxing, Hou Zebiao
Journal of China & Foreign Highway
To enhance the interfacial structure between aggregates and cementitious materials in vegetation porous concrete and improve its compressive strength, this paper investigates the effects of phosphate pretreatment on aggregate properties and the corresponding compressive strength of vegetation porous concrete. The performance of untreated aggregates, water-washed aggregates, and acid-treated aggregates was evaluated, and the modification mechanism was explored from the perspective of the interfacial transition zone (ITZ) using scanning electron microscopy (SEM). The results show that phosphate effectively removes impurities from the aggregate surface and increases surface roughness, thus improving the compactness and stability of the ITZ. After soaking the aggregates …
Experimental Study On Water Stability Of Sand Compound Modified Mud Road,
2023
School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; Ningbo University of Technology, Ningbo, Zhejiang 315211, China
Experimental Study On Water Stability Of Sand Compound Modified Mud Road, Chai Ruixiang, Wu Kai, Ye Wei, Cui Jinmei, Wang Jicheng, Li Zhantao
Journal of China & Foreign Highway
Sand compound modified mud, as a coupled medium of sand and soil, differs from traditional modified mud. To further investigate its water stability indicators, orthogonal design was employed to conduct indoor water stability simulation tests (surface infiltration test, underground capillary water test, and dry-wet cycle test) on sand compound modified mud. The water stability of the modified mud was characterized using the change rate of unconfined compressive strength (UCS). The results show that the unconfined compressive strength and water stability of the modified mud were significantly improved. Under different water disturbance conditions, the order of influence of factors such as …
Deformation Monitoring Of Highway Subgrade In Alpine Area Based On Spaceborne Insar,
2023
CCCC Second Highway Survey and Design Institute Co., Ltd., Wuhan, Hubei 430056, China
Deformation Monitoring Of Highway Subgrade In Alpine Area Based On Spaceborne Insar, Luo Boren, Yu Fei, Yu Shaohuai
Journal of China & Foreign Highway
The harsh geological and climatic conditions in the high-altitude alpine regions of Northwest China, including the widespread distribution of seasonal permafrost and other unfavorable geological bodies, significantly affect the service life of highways and threaten driving safety. Traditional highway deformation monitoring methods are inefficient, limited in coverage, and provide incomplete deformation information. This study employs spaceborne InSAR technology for highway deformation monitoring, enabling large-scale extraction of deformation information along highway corridors. The findings reveal the deformation patterns of highway subgrades in permafrost regions, offering fundamental data for targeted remediation of hazardous highway sections. This approach ensures the scientific construction and …
Research On Compaction Control Method Of High Water Content And High Liquid Limit Clay In Guizhou Province,
2023
China Railway 14th Bureau Group Third Engineering Co., Ltd., Jinan, Shandong 250300, China
Research On Compaction Control Method Of High Water Content And High Liquid Limit Clay In Guizhou Province, Xu Shuliang
Journal of China & Foreign Highway
To study and verify the compaction control method for high liquid limit clay subgrade in the humid and rainy regions of Guizhou Province, a series of experiments were conducted on high water content and high liquid limit clay from the Kaiyang Expressway (Kaili to Yangjia) in Guizhou. The experiments included wet heavy compaction tests, CBR strength tests, basic physical property tests, consolidation tests, thermogravimetric analysis, and trial road tests to analyze the performance of high liquid limit clay in road applications. The results show that for high liquid limit clay, increasing compaction energy does not always improve performance, as excessive …
Study On Dynamic Resilience Modulus Prediction Model Of Subgrade Fine‐Grained Soil Based On Physical Property Parameters,
2023
Southwest Municipal Engineering Design and Research Institute of China, Chengdu, Sichuan 610000, China
Study On Dynamic Resilience Modulus Prediction Model Of Subgrade Fine‐Grained Soil Based On Physical Property Parameters, Tan Wei
Journal of China & Foreign Highway
This paper investigates representative fine-grained subgrade soils from a highway project. Samples with varying water content and compaction degrees were prepared, and the effects of water content, compaction degree, plasticity index, dynamic deviator stress, and confining pressure on the dynamic resilience modulus (Mr) were analyzed using dynamic triaxial tests. Matlab’s global optimization toolbox was employed to identify the relationships between model parameters ki and physical property indices, thus constructing a prediction model for the dynamic resilience modulus based on physical properties. The predictive performance of this model was compared with conventional models outlined in existing standards. The results show that …
Study On Failure Mechanism Of Rainfall Slope Based On Full‐Scale Slope Model Experiment,
2023
Guangxi Han Geotechnical Engineering Co., Ltd., Guilin, Guangxi 541000, China
Study On Failure Mechanism Of Rainfall Slope Based On Full‐Scale Slope Model Experiment, Zhang Yongchuang
Journal of China & Foreign Highway
Field investigations in debris flow source areas reveal that granite is exposed on slope surfaces, while a thin layer of sandy, weathered residual soil is distributed at the slope tops. This paper focuses on the significant permeability differences between the slope base and the upper weathered soil layer. A full-scale slope model experiment was conducted to replicate these characteristics, including rainfall infiltration simulations under both exposed surface conditions and conditions with non-woven fabric filter mats applied. The aim was to investigate the failure mechanism of rainfall-induced debris flows. The results show that the primary trigger for debris flows is the …
Detection Method Of Rural Road Pavement Damage Based On Smart Phone,
2023
School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China
Detection Method Of Rural Road Pavement Damage Based On Smart Phone, Zhang Yang, He Li, Tang Qingzhou, Zhang Dejin
Journal of China & Foreign Highway
Automatic detection of rural road pavement damage is a critical prerequisite for scientific maintenance. To address issues such as high false detection rates, missed detection, and the inability to quantify damage when using smartphones for pavement damage detection, this paper proposes a novel detection method. The proposed method involves using a smartphone to capture pavement images. A region of interest is first selected in the image, followed by weighted least-squares filtering, Canny edge detection, and Hough transform line detection to identify the pavement, minimizing environmental interference and reducing false detection rates. Perspective transformation is then applied to the pavement region …
Analysis Of Socket Depth Between Bridge Pier And Cap With Improved Socket Connection,
2023
School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China
Analysis Of Socket Depth Between Bridge Pier And Cap With Improved Socket Connection, Ge Jiping, Lai Luqi, Wang Zhigang
Journal of China & Foreign Highway
Traditional prefabricated socket-type bridge piers are limited in engineering applications due to the requirement for deep socket connections. This paper proposes an improved socket connection design incorporating measures such as side shear keys, U-shaped anti-punching reinforcement at the pier base, high-strength non-shrink grouting materials, and large-diameter corrugated metal pipe constraints. The current formulas for calculating socket depth in socket-type connections are reviewed, and a modified calculation formula for improved socket-type piers is presented. The influence of factors such as axial compression ratio and concrete strength on socket depth is discussed. The analysis shows that the improved socket connection reduces socket …
Finite Element Model Updating Of Long Span Suspension Bridge Based On Optimized Radial Basis Function Neural Network,
2023
Guangdong Shengxiang Traffic Engineering Testing Co., Ltd., Guangzhou, Guangdong 511400, China
Finite Element Model Updating Of Long Span Suspension Bridge Based On Optimized Radial Basis Function Neural Network, Yang Wenfu, Chen Xin
Journal of China & Foreign Highway
To achieve accurate prediction and analysis of the structural behavior of long-span suspension bridges, a finite element model updating method is proposed. An optimized radial basis function neural network (RBFNN) is constructed using a genetic algorithm to map the relationship between structural responses and parameters. Using structural dynamic responses as inputs, the model updating was performed on a long-span suspension bridge using both numerical simulation data and actual data from a health monitoring system. The results show that the optimized RBFNN effectively represents the functional relationship between structural responses and parameters to be updated. Model updating via the optimized RBFNN …
Key Technology For Design Of Composition Section Of Hybrid Girder Cable‐Stayed Bridge,
2023
Sichuan Highway Planning, Survey, Design and Research Institute Co., Ltd., Chengdu, Sichuan 610041, China
Key Technology For Design Of Composition Section Of Hybrid Girder Cable‐Stayed Bridge, Tian Bo, Song Lubing
Journal of China & Foreign Highway
The main bridge of the Yibin Nanxi (Xianyuan) Yangtze River Bridge adopts an asymmetric hybrid girder cable-stayed design with a 572 m main span. The main span and the north-side span utilize hybrid girders, while the south-side span uses a concrete girder. A steel-concrete composite section is introduced between the south-side span and the main span. This paper explores multiple schemes for the location and key structural design of the steel-concrete composite section, prioritizing a full-section rib connection with a pressure-bearing shear transfer transition structure. The structural rationality and construction feasibility were verified through on-site static model tests, failure model …
Analysis And Reinforcement Measures For Unconventional Cracks In Gravity U‐Type Abutment,
2023
Zhejiang Communications Construction Group Co., Ltd., Hangzhou, Zhejiang 310000, China
Analysis And Reinforcement Measures For Unconventional Cracks In Gravity U‐Type Abutment, Cheng Kun, Du Yinguang, Liu Zhang
Journal of China & Foreign Highway
Horizontal cracking at the foundation level is uncommon in gravity U-type abutments. This paper investigates the causes and reinforcement measures for unconventional horizontal cracks in the foundation and vertical cracks in the abutment wall of a gravity U-type abutment on a highway bridge. Survey and analysis results show that the vertical cracks in the abutment wall are structural cracks caused by excessive reaction forces from permanent loads combined with the impact loads from vehicles at expansion joints. The horizontal foundation cracks result from the presence of filler interlayers at the foundation, which softened over time due to water exposure, leading …
Analysis On Vehicle‐Bridge Interaction Of High‐Pier Continuous Rigid Frame Bridge,
2023
Straits (Fujian) Transportation Engineering Design Co., Ltd., Fuzhou, Fujian 350004, China
Analysis On Vehicle‐Bridge Interaction Of High‐Pier Continuous Rigid Frame Bridge, Liu Huaquan, Yang Dehai, Cai Chengqi, Huang Zhenming, Chen Zhouqi
Journal of China & Foreign Highway
To study the dynamic response characteristics of the vehicle-bridge system under moving vehicle loads, a three-span high-pier continuous rigid frame bridge was selected as the research object. A 2-axle, 7-degree-of-freedom vehicle model was applied to explore the effects of vehicle speed, number of vehicles, and vehicle load on the dynamic response of the vehicle-bridge system. The results show that vehicle speed has minimal impact on the peak displacement response of the bridge. However, when vehicles travel at the same speed, the peak displacement response differs across bridge spans, with resonance occurring at a vehicle speed of 40 km/h. As the …
Research On Application Of Equivalent Stiffened Plate Elements In Local Stability Calculation Of U‐Shaped Stiffened Plates,
2023
Wuhan Comprehensive Transportation Research Institute Co., Ltd., Wuhan, Hubei 430000, China
Research On Application Of Equivalent Stiffened Plate Elements In Local Stability Calculation Of U‐Shaped Stiffened Plates, Chen Xiangjun
Journal of China & Foreign Highway
To address the issue of excessively large computational models in the numerical simulation of U-shaped stiffened plates in large-span flat steel box girder main girders, this paper proposes a finite element calculation theory using equivalent stiffened plate elements and a simplified method for U-shaped stiffened plates. By simplifying the U-shaped small box ribs in U-shaped stiffened plates into equivalent stiffening strips, the transverse stiffness of the cover plate is redistributed, and the effect of equivalent stiffeners on the stress of the plates is calculated. Stability analysis was conducted using Fortran language developed on the Ansys platform, and the results were …
Optimization Research Of Laying Method And Material Type Selection Of Thermal Insulation Layer For Tunnels In Cold Region,
2023
Nanjing Kuntuo Civil Engineering Technology Co., Ltd., Nanjing, Jiangsu 210041, China; School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Optimization Research Of Laying Method And Material Type Selection Of Thermal Insulation Layer For Tunnels In Cold Region, Wu Tao, Liu Zhichun, Liu Xuejiao, Zhang Hongfei
Journal of China & Foreign Highway
To address the issue of frost damage in tunnels in cold regions, research on thermal insulation and frost prevention is crucial. This paper utilizes an improved analytic hierarchy process combined with grey relational analysis to identify optimal insulation materials suitable for different laying methods that provide effective insulation. Numerical simulation methods were then used to calculate and analyze the tunnel temperature field under various combinations of insulation materials and laying methods. Based on the “composite temperature field” comparison results, the optimal insulation scheme was determined. The results show that the “off-wall laying + Furritek insulation board” combination is the optimal …
