交通荷载下路基土中动应力响应特征分析  

Response characteristics of dynamic stress of subgrade soil under vehicle loads

作　　者：汤连生[1,2] 林沛元[1,2] 吴科[1] 邓锡斌[1] 邓钟尉[1,2] 李海洋[1] 

机构地区：[1]中山大学地球科学系,广东广州510275 [2]广东省地质过程与矿产资源探查重点实验室,广东广州510275

出　　处：《岩土工程学报》2011年第11期1745-1749,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(40872205);广东省自然科学基金项目(07003738);广东省科技计划项目(2008B030303009)

摘　　要：为分析路基土的动力响应特征,结合层状黏弹性体系理论,借助黏弹性运动方程和用复柔量表征应力应变关系的本构方程,采用传递矩阵法建立层状黏弹性路基土响应行车荷载的力学行为分析模型,利用实测数据对模型进行了验证。基于该模型和静力学理论,考察了路基土中动静应力随深度的分布规律,探讨车辆荷载强度、荷载频率、循环加载次数、路基深度、土层复柔量、土层密度等因素对路基土中竖向动应力的大小及分布特征的影响,得到了一些有益的结论。In order to analyze the dynamic response characteristics of subgrade soil,based on the theory of the layered visco-elasticity system and the dynamic equation and constitutive equation which employs complex compliance to represent the dynamic stress-strain features,an analytic model for the mechanical behaviors of the subgrade soil subjected to vehicle loads is established by means of the transfer matrix method.The model is validated by the observed data.According to the proposed model and the theory of static mechanics,the distribution rules of dynamic and static stresses with depth are investigated.The influences of vehicle loads,load frequency,loading times,soil depth,soil complex compliance and soil density the values and distribution rules of the vertical dynamic stress in subgrade soil are discussed.Some meaningful conclusions are drawn.

关 键 词：交通荷载 路基土 动应力 层状黏弹性体系 

分 类 号：TU470[建筑科学—结构工程]