3d Reconstruction Method Of Tunnel Surrounding Rock Fracture Based On Vtk,
2024
School of Civil Engineering , Changsha University of Science & Technology , Changsha ，Hunan 410114 , China
3d Reconstruction Method Of Tunnel Surrounding Rock Fracture Based On Vtk, Liu Houxiang, Su Heng
Journal of China & Foreign Highway
Fracture parameters are important reference factors for surrounding rock stability analysis.To realize the visualization analysis of surrounding rock fractures，this paper proposed a three-dimensional （3D） reconstruction method of surrounding rock fractures based on the visualization toolkit （VTK）.Firstly，the collected tunnel surrounding rock images were preprocessed by OpenCV for image grayscale and noise reduction.Secondly，the Otsu method and the open operation in morphology were used to segment the image，and the complete surrounding rock fracture map was obtained.Then，the median method was used to replace the linear interpolation method with the traditional Marching Cubes algorithm in VTK to calculate the equivalent point，and the improved Marching Cubes …
Experimental Study On Deformation Characteristics Of High Liquid Limit Soil Considering The Effect Of Temperature,
2024
Hainan Transportation Engineering Construction Bureau , Haikou , Hainan 570208 , China
Experimental Study On Deformation Characteristics Of High Liquid Limit Soil Considering The Effect Of Temperature, Li Bangwu, Shen Xuning, Zhang Rui, Chen Yanrong
Journal of China & Foreign Highway
In order to study the influence of temperature on the absorbed bound water and deformation characteristics of high liquid limit soil，the high liquid limit soil in Hunan and Hainan provinces were selected for test.The influence of temperature on the content of bound water was measured by a temperature-controlled water bath volumetric flask test.The consolidation test was carried out on the samples with a one-dimensional temperature-controlled consolidometer，and the variation law of high liquid limit soil deformation affected by temperature was analyzed under the modified pore ratio considering the bound water content.The results show that the absorbed bound water in the high …
Surface Grouting Reinforcement Technology For Shallowly Buried Tunnel In Coastal Zone,
2024
Nuclear Industry Huzhou Survey , Planning and Design Institute Co ., Ltd., Huzhou , Zhejiang 313000 , China ;Geotechnical Research Institute , Hohai University , Nanjing , Jiangsu 210098 , China
Surface Grouting Reinforcement Technology For Shallowly Buried Tunnel In Coastal Zone, Xiang Ze, Deng Shiping, Sheng Zhang, Zhou Ye, Wang Wei, Pei Yabing
Journal of China & Foreign Highway
The Ⅵ level surrounding rock section of a project water intake tunnel is located in the coastal zone，with thick overlying sand layers，broken surrounding rock，and other characteristics.To address these issues，laboratory tests were conducted to explore the effect of water glass volume dosing on the final setting time and strength of cement-sodium silicate （CS） liquid slurry，and field tests were carried out for a comprehensive analysis of grouting methods.The constraint-dispersion mode was finally determined to divide the grouting area into several small grouting units.Advance plastic pipe grouting reinforcement was performed according to the grouting sequence of the outermost circle hole interval first，followed by …
Comparison Analysis Of Different Settlement Prediction Models Under Small Post‑ Constructio N Load On Soft Foundation,
2024
School of Traffic & Transportation Engineering , Changsha University of Science & Technology , Changsha , Hunan 410114 ,China
Comparison Analysis Of Different Settlement Prediction Models Under Small Post‑ Constructio N Load On Soft Foundation, Han S Hanpeng, Fu Wei, Zhang Junhui, Lin Chen
Journal of China & Foreign Highway
Settlement deformatio n is a key conc ern in soft foundation construction.Since there is still a small load applied after the filling of soft foundation in the actual project,based on the settlement monitoring data of the high-fill section of Zhaoyang West Ring Expressway in Zhaotong City,Yunnan Province,three settlement prediction methods,namely the hyperbolic method,the three-point method,and the Hoshino method,were used to predict,compare,and analyze the settlement of the fill foundation,and the fitting characteristics of each model were summarized.By comparing the fitting curves and the actual settlement curves,it was found that the loading on the roadbed will cause large errors in the prediction …
Dynamic Response Analysis Of Bridge Under Combined Action Of Random Traffic Flow And Wind Based On Simpack Platform,
2024
Wuhan Company , China Railway Major Bridge Reconnaissance & Design Institute Co ., Ltd., Wuhan , Hubei 430074 , China
Dynamic Response Analysis Of Bridge Under Combined Action Of Random Traffic Flow And Wind Based On Simpack Platform, Xiong Tao, Han Yan, Ma Xingchuan, Li Qianming, Yan Naijie, Zhang Fei, Hu Peng
Journal of China & Foreign Highway
To deal with the time-consuming problem of calculating the dynamic responses of the bridge under the combined action of random traffic flow and wind，a steel box continuous girder bridge was taken as the engineering background，and the finite element model of the bridge and the vehicle model were established in the commercial software Ansys and SIMPACK，respectively.Then，the dynamic responses of the bridge subjected to the single vehicle load，wind loads，and multiple vehicle loads were calculated to verify the superposability of the dynamic responses of the bridge.On this basis，the Monte Carlo method was used to generate the random traffic flow samples.By using the verified …
Research Progress Of Rubber‑Modified Asphalt By Wet Process,
2024
School of Traffic & Transportation Engineering , Changsha University of Science & Technology , Changsha , Hunan 410114 , China ;National Engineering Research Center of Road Maintenance Technologies , Changsha , Hunan 410114 , China ;National Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment , Changsha , Hunan 410114 , China
Research Progress Of Rubber‑Modified Asphalt By Wet Process, Ge Dongdong, Jiang Xiangyang, Lyu Songtao, Zhang Honggang, Song Xiaojin
Journal of China & Foreign Highway
The application of waste tires in asphalt pavements can not only effectively reduce resource consumption but also significantly reduce environmental pollution.Crumb rubber could be obtained by processing waste tires and used as a modifier by mixing with asphalt through the wet process to improve the performance of asphalt.This paper reviewed the research progress of rubber-modified asphalt by wet process and discussed its preparation process，influencing factors of performance，and modification mechanism.By reviewing the relevant studies，the critical conditions in the preparation process and their effects on storage stability were summarized.Furthermore，the effects of rubber dosage，particle size，matrix asphalt type，and preparation parameters on the physical and …
Skid Resistance Detection Technology Of Highway Pavement Based On Tie‑Pavement Coupling Noise,
2024
China Merchants Chongqing Communications Technology Research & Design Institute Co .,Ltd., Chongqing 400067 , China
Skid Resistance Detection Technology Of Highway Pavement Based On Tie‑Pavement Coupling Noise, Ye Wei, Chen Fei, Hu Xiaoyang, Xu Zhengwei, Li Liguo
Journal of China & Foreign Highway
In order to improve the skid resistance detection technology of highway pavement，this paper summarized the advantages and disadvantages of the traditional pavement noise measurement methods，adopted the vehicle-following method to collect the tie-pavement coupling noise，and optimized the specific positional parameters of the microphone.The speed correction of the equivalent continuous A-weighted sound level was realized through the fitting of driving speed and equivalent continuous A-weighted sound level.The characteristic signal of the tie-pavement coupling noise was extracted by the principal component analysis method，and it can effectively suppress interference signals such as traffic noise，wind noise，and engine noise.The envelope noise energy （ENE） was obtained by …
Effect Of Corn Stover Oil On Rheological Properties Of Aged Asphalt And Its Regeneration Effect,
2024
College of Civil Engineering , Northeast Forestry University ，Harbin ,Heilongjiang 150040 , China
Effect Of Corn Stover Oil On Rheological Properties Of Aged Asphalt And Its Regeneration Effect, Cheng Peifeng, Bai Yue, Li Yiming, Zhang Zhanming
Journal of China & Foreign Highway
Corn stover oil，as a kind of bio-oil，is low-carbon and renewable.At the same time，it may restore the performance of aged asphalt.In order to further promote the application of corn stover oil in road engineering，this study explored the effect of corn stover oil as a kind of regeneration agent on the rheological properties of aged asphalt through laboratory experiments and analyzed the regeneration effect.On this basis，the regeneration mechanism of corn stover oil regeneration agent was revealed by using an infrared spectroscopy test and gel permeation chromatography test.The results show that the addition of corn stover oil changes the proportion of aged asphalt …
Research And Practice On Demolition Of Lane Separator In Same Direction Along Zhengzhou‒Luoyang Section Of Lianyungang‒Khorgos Expressway,
2024
CCCC Frist Highway Consultants Co .,Ltd., Xi’an, Shaanxi 710075 , China
Research And Practice On Demolition Of Lane Separator In Same Direction Along Zhengzhou‒Luoyang Section Of Lianyungang‒Khorgos Expressway, Zhang Nan, Ji Xiang, Ma Gang
Journal of China & Foreign Highway
In order to solve the problem arising after the demolition and closure of the lane separator in the same direction along the expressway，this paper systematically introduced the reconstruction method of the lane separator in the same direction by studying the overhaul project along Zhengzhou-Luoyang section of Lianyungang‒Khorgos Expressway.The paper explored the main diseases and potential safety hazards existing in the lane separator in the same direction by checking the compliance of specifications，analyzing the traffic operation status，exploring the characteristics of traffic accidents，and investigating the traffic safety facilities.On this basis，it demonstrated the feasibility of demolishing the lane separator in the same direction.According …
Mechanical Properties Of Alkali‑Activated Slag‑Fly Ash Geopolymers,
2024
School of Civil Engineering , Changsha University of Science & Technology , Changsha , Hunan 410114 , China
Mechanical Properties Of Alkali‑Activated Slag‑Fly Ash Geopolymers, Liu Yang, Wang Jizhao, Lu Naiwei, Wang Bowen
Journal of China & Foreign Highway
In order to respond to the national strategy of energy saving and emission reduction and improve the comprehensive utilization rate of industrial waste，the influence of slag content，alkali equivalent，sodium silicate modulus，and water-cement ratio on the compressive strength of slag-fly ash geopolymers was investigated by single variable and orthogonal experiment method.The compressive strength of geopolymers was analyzed by combining XRD，SEM，and porosity.The results show that the gel formation is promoted with the increase in slag content，and the structure of geopolymers is more compact，which is conducive to the development of strength.After 28 days of standard curing，the influence of various factors on the compressive strength …
Mechanical Properties Of Geopolymer‑Stabilized Recycled Aggregates From Construction Solid Wastes,
2024
China Road & Bridge Corporation ，Beijing 100001 ,China
Mechanical Properties Of Geopolymer‑Stabilized Recycled Aggregates From Construction Solid Wastes, Yuan Kaixin, He Yongjian, Zhang Laijun, Li Hai, Xu Gewei
Journal of China & Foreign Highway
In order to solve the problem of a sharp increase in construction solid wastes and insufficient utilization rate，this paper took slag-fly ash-based geopolymer as an inorganic binder，replaced natural gravels with recycled aggregates from construction solid wastes，and set urban road base layer as the target scene to study the mechanical properties of geopolymer-stabilized recycled aggregates at different contents.The results show that with the increase in geopolymer content，the maximum dry density of the mixture increases.The optimum moisture content increases.The unconfined compressive strength of the mixture increases with the increase in geopolymer content and curing age and decreases with the increase in recycled …
Comparative Experimental Study On Deformation Characteristics Of High Liquid Limit Soil Under Different Dry And Wet States,
2024
School of Traffic & Transportation Engineering , Changsha University of Science & Technology , Changsha ，Hunan 410114 , China
Comparative Experimental Study On Deformation Characteristics Of High Liquid Limit Soil Under Different Dry And Wet States, Qin Lingwei, Zhang Rui, Li Lu, Xiao Yupeng
Journal of China & Foreign Highway
In order to further reveal the internal mechanism of the influence of solid-like bound water on the deformation characteristics of high liquid limit soil，the difference in the influence of different bound water contents on the deformation of soil samples was analyzed through the comparison of dry and wet sides.Four types of high liquid limit soil with different water contents at the same dry density were used，and a low liquid limit soil was used as a comparison sample to carry out a deformation test.The volumetric flask method was used to test the content of adsorbed bound water in each test soil …
Influence Of Loading Methods On Compression Modulus Of Red Sandstone Soil Solidified With Biological Enzyme And Cement,
2024
Hunan Hengyong Expressway Construction and Development Co ., Ltd., Yongzhou , Hunan 426100 , China
Influence Of Loading Methods On Compression Modulus Of Red Sandstone Soil Solidified With Biological Enzyme And Cement, He Liang, Zhang Haixiang, Guan H Ongxin, Li Huili, Yang Hairong, Liu Hongfu
Journal of China & Foreign Highway
There are various methods to test the modulus of cement-stabilized mixtures.The stiffness performance of cement-stabilized materials will be affected after adding biological enzymes.In order to systematically analyze the influence of loading conditions on the compression modulus of the red sandstone soil solidified with biological enzyme and cement，compressive modulus tests were conducted on the red sandstone soil solidified with biological enzyme and cement by using three static modulus test methods including monotonic loading method of middle section，stepwise loading and unloading method of top surface，and stepwise loading and unloading method of middle section，as well as dynamic modulus method of top surface and …
Optimization Of Mix Proportion For New Jersey Precast Concrete Safety Barriers And Performance Tests Under Integral Concrete Vibrating,
2024
Guangxi Xinxiang Expressway Co ., Ltd., Nanning , Guangxi 530004 , China
Optimization Of Mix Proportion For New Jersey Precast Concrete Safety Barriers And Performance Tests Under Integral Concrete Vibrating, Chen Lin, Li Beian, Li Yuanrui, Zhao Zixiang
Journal of China & Foreign Highway
New Jersey safety barriers are the most commonly used form of guardrails in highway median separators due to their excellent safety protection.In response to the cost reduction and quality improvement，efficient and rapid preparation process，and quality issues of New Jersey precast concrete safety barriers，this article adopted the automation production process of New Jersey precast safety barriers，optimized concrete mix proportion for precast safety barriers，and studied their performance.The experimental results show that in the designed C 30 concrete，the compressive strength of the concrete mixed with 15% fly ash reaches 39.2 MPa，and th e slump reaches 185 mm.The concrete performance meets the requirements of …
Experimental Study On Shear Behavior Between Nrc‑Uhpc Interface,
2024
Operating Branch , Guangzhou Communications Investment Group Co ., Ltd., Guangzhou , Guangdong 511430 , China
Experimental Study On Shear Behavior Between Nrc‑Uhpc Interface, Chen Zhenkan, Li Junsheng, Shi Quan, Fang Haozhen, Mo Fan, Jiang Haibo
Journal of China & Foreign Highway
In order to investigate the effect of the screw diameter of planted bars and ultra-high performance concrete （UHPC） pouring method on the shear behavior of normal reinforced concrete （NRC） and UHPC， two groups of six push-out specimens were designed for shear behavior tests.The results show that after the failure of the concrete bonding force in the NRC-UHPC interface，the screw can maintain shear behavior so that the failure process of the specimen after the load reaches the peak shows ductile characteristics.For specimens with screw diameters of 12 mm and 16 mm，greater screw diameter indicates higher shear capacity of the specimens and …
Design And Construction Process Of Cross‑Beam Supports For Main Tower Of Changtai Changjiang River Bridge,
2024
CCCC Wuhan Harbour Engineering Design and Research Co ., Ltd., Wuhan , Hubei 430040 , China;Hubei Key Laboratory of Advanced Materials & Reinforcement Technology Research for Marine Environment Structures , Wuhan , Hubei 430040 , China
Design And Construction Process Of Cross‑Beam Supports For Main Tower Of Changtai Changjiang River Bridge, Zeng Jian, Hu Pei, Wang Chao
Journal of China & Foreign Highway
The construction of the lower cross-beam structure of the main tower of Changtai Changjiang River Bridge has the characteristics of high construction height，large amount of concrete earth volume，and difficult control of down-warping deformation.In order to implement the pouring of the lower cross-beam of the main tower，floor-type steel pipe supports were set at the lower cross-beam，which were used to support the lower cross-beam formwork and bear the load during the concrete pouring.Through the finite element software analysis and calculation，it was found that the asymmetric deformation of the main structure of the lower cross-beam could be effectively controlled，and the overall force of …
Determination Of Manufacturing Parameters Of Large Section Of Continuous Steel Box Beam With Variable Section In Shenzhen‑Zhongshan Passage,
2024
School of Civil Engineering , Changsha University of Science & Technology , Changsha , Hunan 410114 , China
Determination Of Manufacturing Parameters Of Large Section Of Continuous Steel Box Beam With Variable Section In Shenzhen‑Zhongshan Passage, Dong Chuangwen, Chen Long, Li Chuanxi
Journal of China & Foreign Highway
Accurate calculation of manufacturing parameters is the key to the efficient，high-precision，and rapid installation of large sections of continuous steel box beam bridges.Taking the steel box beam with the variable section in Shenzhen-Zhongshan Passage as the background，this paper first established a finite element model of the beam element in the whole construction process to obtain the pre-camper.Secondly，the average neutral axis position was calculated based on the height of the neutral axis of each beam section.Then，according to the deformation characteristic that the beam length remained unchanged at the mean neutral axis，the pre-camber was superimposed at the mean neutral axis to get the …
Key Technology For Construction Of New Single‑Wall Steel Suspended Box Cofferdam With High Pile Tied Beams In Deep Water,
2024
CCCC Second Harbor Engineering Company Ltd ., Wuhan , Hubei 430040 , China
Key Technology For Construction Of New Single‑Wall Steel Suspended Box Cofferdam With High Pile Tied Beams In Deep Water, Yang Jinlong, Zhao Lin, Jiang Qunlong
Journal of China & Foreign Highway
In order to ensure the safe，efficient，and economical completion of the construction of the high pile tied beam of Muping Xiangjiang River Bridge in deep water，a new type of single-wall steel suspended box cofferdam was designed to act as the water retaining and enclosure structure during high pile tied beam construction according to the characteristics of deep water level and shallow stratum cover layer at the high pile tied beam location.Through the innovative design of steel casing on the bottom of the steel suspended box cofferdam，the design height of the wall panel and the amount of steel input were reduced.On the …
Influence Factors Of Carbonization Of Tunnel Segment Structure And Life Prediction Analysis,
2024
CCCC Tunnel Bridge (Nanjing ) Technology Co ., Ltd., Nanjing , Jiangsu 211800 , China ;Tunnel Maintenance Technology R&D Center , CCCC Infrastructure Maintenance Group Co ., Ltd., Nanjing , Jiangsu 211800 , China
Influence Factors Of Carbonization Of Tunnel Segment Structure And Life Prediction Analysis, Li Dongbiao, Miao Miao, Shen Caihua, Chen Wei
Journal of China & Foreign Highway
There are many factors that affect the carbonization life of concrete segments in underwater tunnels，and the prediction methods are not uniform.In this paper，combined with actual engineering，the influencing factors and laws of carbonization of concrete segments in underwater tunnels were analyzed，and three methods for predicting the life of concrete segments were established with the crack limit as the control target.The prediction results of the three methods were compared.The results show that the influence of the temperature and CO2 concentration in the tunnel predicted by the three methods on the life of the tunnel lining structure is basically consistent with the existing …
Key Technology For Incremental Launching Construction Of Double Guide Beam Of Steel Box Girder,
2024
CCCC Second Harbor Engineering Co .,Ltd., Wuhan ,Hubei 430012 , China
Key Technology For Incremental Launching Construction Of Double Guide Beam Of Steel Box Girder, Sun Xiaoqiang, Yue Xinxing
Journal of China & Foreign Highway
By taking the incremental launching construction of the steel box girder at the 6th hole of the approach bridge of Baoji Taigu Bridge as the engineering background，the original plan adopted single-guide beam multi-point walking incremental launching technology for assembly and incremental launching on the prestressed reinforced concrete beam of the adjacent hole.Since the middle span of the concrete beam cannot withstand the concentrated force at the incremental launching points，the multi-guide beam multi-point walking incremental launching technology was finally used to arrange the incremental launching points at the transverse diaphragm plate of the end of the concrete beam.By increasing the incremental …
