岩土力学2009，Vol.30Issue(7)：2031-2036,6.
考虑坑壁位移和土压力方向的直撑力学特性
Mechanical characteristics of straight brace considering displacement of foundation pit and direction of earth pressure
摘要
Abstract
It is generally realized that earth pressure will change with the deformation and displacement of foundation pit. But at present the design of straight brace does not almost consider earth pressure changing with displacement of foundation pit. Firstly, the researches and achievements on the nonlinear relation of earth pressure and the displacement of foundation pit are summarized. Secondly, the rules on earth pressure changing with the displacement and movement of the side of foundation pit are discussed. On the basis of the present researches and the change rules on earth pressure changing with displacement of foundation pit, new formulas of axial force and deformation of straight brace considering the rotation or movement of the side of foundation pit are presented. At last, the curves of axial force and deformation of straight brace changing with some factors are obtained. Those factors include different initial displacement of foundation pit, supporting location of straight brace, friction angle of soil and retaining structure, resultant force action point of earth pressure. Conclusions can be drawn as follows from these curves: axial force and deformation of straight brace will diminish with the increase of displacement of foundation pit, supporting location height of straight brace and friction angle of soil and retaining structure. The height enhancement of resultant force action point of earth pressure will improve axial force and deformation of straight brace. But the initial displacement of the side of foundation pit has no influence on axial force and deformation of straight brace.关键词
支撑/直撑/基坑/土压力/位移Key words
brace/ straight brace/ foundation pit/ earth pressure/ displacement分类
建筑与水利引用本文复制引用
宋明健,汤连生,胡辉,王大志,徐通..考虑坑壁位移和土压力方向的直撑力学特性[J].岩土力学,2009,30(7):2031-2036,6.基金项目
国家自然科学基金资助项目(No. 40872205) （No. 40872205）
全国高等学校博士学科专项科研基金资助项目(No. 20070558032) （No. 20070558032）
广东省自然科学基金资助项目(No. 07003738) （No. 07003738）
广东省科技计划资助项目(No. 2008B030303009). （No. 2008B030303009）
