反复动载下土体的动应力累积效应及量化模型研究  

Research on accumulation effect of dymanic stress in plastic soil under repeated dynamic loads and its quantitative model

作　　者：张庆华[1,2] 汤连生[1] 吴玉刚 尹敬泽 

机构地区：[1]中山大学地球科学系,广州510275 [2]广州市城市规划勘测设计研究院,广州510060 [3]广东省公路建设有限公司,广州510600

出　　处：《水文地质工程地质》2009年第6期76-79,共4页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金资助项目(40872205);全国高等学校博士学科专项科研基金资助项目(20070558032);广东省自然科学基金资助项目(07003738);广东省科技计划资助项目(2008B030303009,2004B32801002,2003C33301)

摘　　要：土体受到反复动载作用时,土中产生的动应力在一个周期荷载结束后不会立刻释放,而是需要一定的扩散时间,其中部分应力将逐次叠加到下一次荷载产生的动应力之中,随着动载次数的增加而逐渐积累,形成动应力"累积效应"。试验结果表明,动应力累积总量与土体性质、荷载产生的动应力强度、动载频率及动载次数等因素有关,在反复动载作用下,土中产生的动应力包括单次动载产生的动应力与反复动载产生的动应力累积两部分。Accumulation effect of dynamic stress is put forward for the first time according to model simulating test. It will take a long time for the dynamic stress in plastic soil caused by repeated dynamic loads to release absolutely, and part of the dynamic stress will gradually add to the dynamic stress caused by next dynamic loads, which is the ＂accumulation effect＂ of dynamic stress. The accumulative dynamic stress lies on soil＇ s character, dynamic stress intensity caused by the loads, frequency and times of the loads. The dynamic stress in subgrade soil under repeated dynamic loads composed of stress caused by single load and accumulated stress caused by repeated loads.

关 键 词：反复动载 动应力 累积效应 量化模型 

分 类 号：TU441.8[建筑科学—岩土工程]