车辆动荷载作用下黄土暗穴对路基稳定性影响的数值分析  

Numerical Analysis of Subgrade Stability Influenced by Hidden Holes in Loess Under Dynamic Load of Vehicles

作　　者：彭建兵[1] 陈立伟[1] 邓亚虹[2] 范文[1] 

机构地区：[1]长安大学地质工程与测绘工程学院,陕西西安710054 [2]浙江大学建筑工程学院,浙江杭州310027

出　　处：《中国公路学报》2006年第4期17-22,共6页China Journal of Highway and Transport

基　　金：国家西部交通建设科技项目(200131881213);中国博士后科学基金项目(2004036055)

摘　　要：针对车辆动荷载作用下黄土暗穴对路基稳定性的影响,运用有限元方法对其进行了动力响应分析。分析中将车辆通过时路面所承受的动荷载简化为落锤式弯沉仪(FWD)产生的动态冲击荷载,考虑了路面的实际结构体系以及车速、洞径、埋深和偏移距离等主要因素的影响。找出了临界洞室埋深随洞径和偏移距离变化的规律,并确定出了路基下伏暗穴治理范围,同时对动、静荷载效应进行了对比分析。结果表明:在实际计算中,可以将静载乘以某一“放大系数”作为计算荷载进行拟静力分析。Aiming at the subgrade stability problem influenced by hidden holes in loess under dynamic load of vehicles, dynamic response analysis was performed by finite element method. The dynamic load of vehicles was simplified as impact load caused by FWD. The actual structure system of pavement, the effect of the main factors, such as the speed of vehicles, the diameter and depth of caves and the deviation distance were taken into account during analysis. The law of critical depth varying with diameter and deviation distance and the hidden holes handling range under subgrade were found out; also the effects of dynamic and static load were compared. The results show that the dynamic stability analysis can be replaced by quasi-static method with the static load multiplying an amplification factor in calculation.

关 键 词：道路工程 路基 有限元方法 黄土暗穴 车辆动荷载 动力响应 

分 类 号：U416.169[交通运输工程—道路与铁道工程]