长期重复荷载作用下土体与邻近桩基相互作用研究  

Study on soil-pile interaction subjected to long-term repeated surcharge loads

作　　者：杨敏[1] 周洪波[2] 朱碧堂[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]广东省建筑设计研究院,广州510010

出　　处：《岩土力学》2007年第6期1083-1090,共8页Rock and Soil Mechanics

基　　金：上海市科委重点资助基础研究课题(No.02DJ14062);教育部高等学校博士学科点专项科研基金资助项目(No.20020247003)

摘　　要：在前人研究的基础上,基于临界状态土力学理论,在Carter模型中引入临界重复应力的概念形成改进Carter模型;该模型概念明确、参数简单,可以合理地反映重复加卸载作用下土体主要特性。利用改进Carter模型,编制平面应变有限元程序,对长期重复加卸载作用下土体与临近桩基相互作用进行系统分析,探讨了长期重复加卸载作用下有桩和无桩时土体沉降和侧移的变化规律,并讨论了软土屈服面衰减系数、临界重复应力水平、临近桩基刚度等变化时桩土相互作用性状的变化,得出一些有益的结论。The characteristics of soils under long-term repeated surcharge loads are discussed in detail by studying the relevant results reported in the references. The concept of introducing critical repeated stress level into the Carter Model is expounded based on the critical state soil mechanics; and the Carter Model is modified. The modified Carter Model can reflect reasonably the main characteristics of soils under long-term repeated surcharge loads. Then, the soil and pile foundation interaction under long-term repeated loading is analyzed in detail using the plane strain FEM program. In the program, the characteristics of soils under long-term repeated surcharge loads are simulated by the modified Carter Model. The law of settlements and displacements of soils and piles under long-term repeated loading is discussed; then the influences of several factors such as the magnitude of θ, critical repeated stress level and pile stiffness, etc., are discussed. Finally, some useful conclusions are drawn.

关 键 词：长期重复荷载 临界状态土力学 被动桩 相互作用 有限元 

分 类 号：TU443[建筑科学—岩土工程]