摘要
应用Midas/GTS数值分析软件对车辆动荷载作用下基坑支护体系的动力响应进行了模拟分析。通过调整车速和车辆行驶位置系统地分析了不同车速行驶动荷载作用下基坑支护结构的内力及位移变化情况。研究发现,基坑桩锚支护体系中锚杆轴力随车速提升呈先增大后减小的规律,支护桩整体结构在车速动荷载影响下与锚杆轴力呈相同变化趋势,汽车在一定行驶速度范围内,随着车速的提升支护桩位移逐渐增大,达到波动峰值后位移变小;车辆距离基坑边线的行驶位置与桩锚支护结构受力变化呈非线性关系,距离越近影响变化越明显。结合具体工程实例,通过对现场监测数据分析并与数值模拟结果进行对比,结果表明,数值模拟与现场监测得到的基坑支护体系内力及位移变化规律一致,数值模拟技术工程指导效果显著。
The dynamic response of foundation pit supporting system under vehicle dynamic load was simulated and analyzed by using Midas/GTS numerical analysis software.By adjusting the vehicle speed and vehicle driving position,the changes of internal force and displacement of foundation pit supporting structure under different speed dynamic load were analyzed systematically.The results showed that the axial force of anchor in the pile-anchor supporting system of foundation pit increased at first and then decreased with the increase of vehicle speed,and the whole structure of supporting pile changes in the same trend as the axial force of anchor under the influence of vehicle speed and dynamic load.Within a certain range of driving speed,the displacement of the supporting pile increased gradually with the increase of the vehicle speed,and became smaller after reaching the fluctuating peak value.There is a nonlinear relationship between vehicle driving position and stress change of the pile-anchor supporting structure.The closer the distance was,the more obvious the change was.Combined with a specific engineering example,through the analysis of the on-site monitoring data,compared with the numerical simulation results,the results showed that the internal force and displacement of the foundation pit supporting system obtained by numerical simulation and on-site monitoring were consistent.The engineering guidance effect of numerical simulation technology was remarkable.
作者
赵桐德
李二超
闫继业
宋胜利
石振彤
杨文峰
ZHAO Tongde;LI Erchao;YAN Jiye;SONG Shengli;SHI Zhentong;YANG Wenfeng(School of Mechanics&Civil Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;The First Geological Institute of the China Metallurgical Geology Bureau,Langfang 065201,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2020年第3期216-222,共7页
Earthquake Engineering and Engineering Dynamics
基金
中央高校基本科研业务费专项基金项目(2010YL01)。
关键词
车辆荷载
基坑支护
车速
内力位移
数值模拟与监测
vehicle load
foundation pit support
vehicle speed
internal force displacement
numerical simulation and monitoring
