车辆动载下路基土竖向动应力及扩散规律  

Research on Dynamic Stress of Subgrade Soil under Vehicle Loads and Its Diffused Rule

作　　者：刘伟[1] 汤连生[2] 张庆华[1] 

机构地区：[1]广州市城市规划勘测设计研究院,广东广州510060 [2]中山大学地球科学系,广东广州510275

出　　处：《重庆交通大学学报（自然科学版）》2012年第4期799-802,823,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(50279056);广东省自然科学基金项目(07003738);广东省科技计划资助项目(2003C33301;2004B32801002)

摘　　要：推导了车辆动载作用下路基土中竖向动应力的求解方法,提出用速度系数来表征车辆动载下路基顶面产生的竖向动应力与车辆运行速度的关系,并模拟试验确定了速度系数的取值为0.105。原位监测试验表明:车辆动载在路基顶面产生的竖向动应力值约为0～16 kPa,大小与车辆载重及运行速度等因素有关。计算分析了5种类型车辆动载下路基土中竖向动应力的扩散规律。结果显示:随着深度增加,路基土中的竖向动应力逐渐减小,当路基土的深度超过8m时,所有类型车辆荷载在路基土中产生的竖向动应力不到路基顶面的10%;车辆载重越大,竖向动应力扩散速度越慢。It put forward a method to calculate vertical dynamic stress of the subgrade under vehicle loads.Vertical stress of the subgrade soil under moving loads is different from the stress under inmobile loads,which can be described by 'speed coefficient' and its value is 0.105.The dynamic stress on the top of the subgrade caused by the vehicle loads varies from 0 kPa to 16 kPa,and it will decrease as depth increases.When the depth of subgrade soil is more than 8m,the dynamic stress caused by vehicle loads is less than 10 percents of the stress on the top of the subgade soil.As the vehicle loads is bigger,the vertical dynamic stress diffuses slower.

关 键 词：车辆动载 路基土 动应力 速度系数 扩散规律 

分 类 号：U41[交通运输工程—道路与铁道工程]