基于PLAXIS的车辆荷载作用下基坑支护模拟研究
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摘要
随着城市化进程的不断发展,呈现出车流量越来越大和基坑越来越深的趋势,交通主干道上行驶的车辆荷载会对邻近的基坑稳定性和安全性产生一定的影响。通过PLAXIS有限元软件进行不同车速、作用时间、作用距离的车辆荷载作用下基坑支护结构变形的影响研究,结果表明支护结构的最大水平位移和车速呈正比关系,且随着车速的增大其增幅越来越大;和作用距离呈反比关系,随着作用距离的减小而增大。同时车辆荷载的影响随作用时间有累积效应,累积到一定程度后不再变化。研究成果可为实际工程中车辆荷载作用时支护结构的稳定性分析和变形计算提供参考。
With the continuous development of urbanization, the trend of increasing traffic volume and deeper foundation pits is becoming more and more popular, the load of vehicles on the main roads of traffic will have a certain impact on the stability and safety of adjacent foundation pits. The PLAXS finite element software is used to study the influence of the deformation of the foundation pit under different vehicle load including different vehicle speeds,time of action and working distance. The results show that the maximum horizontal displacement of the supporting structure is proportional to the speed of the vehicle and increases larger and larger with the speed of the vehicle; it is inversely proportional to the action distance and increases with the decrease of the action distance. At the same time, the influence of vehicle load has a cumulative effect with the action time, and it does not change after accumulating to a certain extent. The research results can provide reference for the stability analysis and deformation calculation of the supporting structure during the vehicle load in actual engineering.
With the continuous development of urbanization, the trend of increasing traffic volume and deeper foundation pits is becoming more and more popular, the load of vehicles on the main roads of traffic will have a certain impact on the stability and safety of adjacent foundation pits. The PLAXS finite element software is used to study the influence of the deformation of the foundation pit under different vehicle load including different vehicle speeds,time of action and working distance. The results show that the maximum horizontal displacement of the supporting structure is proportional to the speed of the vehicle and increases larger and larger with the speed of the vehicle; it is inversely proportional to the action distance and increases with the decrease of the action distance. At the same time, the influence of vehicle load has a cumulative effect with the action time, and it does not change after accumulating to a certain extent. The research results can provide reference for the stability analysis and deformation calculation of the supporting structure during the vehicle load in actual engineering.
引文
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[14]刘志祥,张海清. PLAXIS 3D基础教程[M].北京:机械工业出版社, 2015.
[2] LOMBAERT G, DEGRANDE G, CLOUTEAU D. Numerical modelling of free field traffic-induced vibrations[J]. Soil dynamics&earthquake engineering, 2000, 19(7):473-488.
[3]张友葩,高永涛,方祖烈,等.交通载荷下挡土墙的失稳分析[J].北京科技大学学报, 2003(1):18-22.
[4]王直民,张土乔,吴小刚.不平整路面上的车辆等效动载系数[J].浙江大学学报(工学版), 2007(6):1007-1011.
[5]孙吉书,梅林健,杨辉,等.车辆动态荷载系数的主要影响因素分析[J].低温建筑技术, 2017, 39(12):60-62.
[6] WATTS G R, KRYLOV V V. Ground-borne vibration generated by vehicles crossing road humps and speed control cushions[J].Applied acoustics, 2000, 59(3):221-236.
[7]陶向华,黄晓明.车辆动载荷的频域模拟计算与分析[J].土木工程与管理学报, 2003, 20(4):47-50.
[8]黄仰贤.路面分析与设计[M].北京:人民交通出版社, 1998.
[9]许朝阳,周锋,吕惠,等.动荷载下桩承式路堤的承载特性及机制研究[J].岩土力学, 2014, 35(11):3231-3239.
[10]邱培勇.车辆荷载作用下地下连续墙的响应分析[D].西安:西安科技大学, 2016.
[11]王家全,张亮亮,赖毅,等.加筋土挡墙静动力学特性大模型试验研究[J].岩土力学, 2019, 40(2):1-9.
[12]田飞,褚进晶.交通荷载特性及其模拟方法研究[J].水利与建筑工程学报, 2014(4):66-71.
[13]邓宗伟.山区高速公路轻型支挡结构的力学机理与应用研究[D].长沙:中南大学, 2007.
[14]刘志祥,张海清. PLAXIS 3D基础教程[M].北京:机械工业出版社, 2015.