采空区汽车荷载作用下的路基基础破坏机理初步分析.pdf

第八届全国振动理论及应用学术会议论文集，上海，2003 年 11 月 采空区汽车荷载作用下的路基基础破坏机理初步分析 汤爱平，关海燕，武一雪 （哈尔滨工业大学土木工程学院，哈尔滨 150090） 摘 要： 不平整的路面和汽车速度的变化，产生了汽车对路基基础的随机动力作用。当路基下存在采空 区时，在这种随机的动荷作用下，路基极易产生开裂、沉降、滑塌等破坏。本文针对鸡西市某采空区路段路 基的破坏情形，通过建立破坏路段的地质模型和路基与采空区的空间分布模型，利用岩土的损伤理论和损伤 累积理论，探讨了该路段在汽车动荷载作用下的路基基础破坏机理，提出了采空区路基的三种失效机制，并 建议了相应的治理方法。研究表明，道路路基的破坏与与汽车动力荷载、采空区地质情况、岩土介质的损伤 与累积密切相关。 关键词： 汽车荷载；损伤理论；破坏机理；道路系统；采空区 Damage Mechanism of Road Foundation under Vehicle Dynamic Load in Mined-out Area TANG Ai-ping, GUAN Hai-yan , WU Yi-xue (School of Civil Engineering, Harbin Institute of Technology, Harbin, 1500090) Abstract: Due to the uneven of pavement surface and the change of vehicle speed, the dynamic load will be brought when the vehicle run on the pavement surface. The dynamic load damages not only the pavement, but also the foundation; it has shown that the foundation has a greater damage possibility in mined-out areas than that in other area. Because there is a lot of mined-out area in China, as the development of traffic networks, these mined-out areas have to have been developed for building the railway and express road. It has been proved that a lot of accidents have taken place in mined-out area because of the damage of foundation, so, it is necessary to study the damage mechanism of road foundation under vehicle dynamic load in mined-out area to ensure the traffic safety,. The paper presents the researching progresses in this way. At first, 基金资助：国家自然科学基金（No 作者简介：汤爱平（1968－），男，湖南人，副教授，博士 1 the vehicle dynamic load, which is the function of vehicle speed and uneven levels of pavement surface, is simulated by a stochastic function based on the experiment and spot survey; the un