基于统一强度理论的地基极限承载力公式  

Formula of ultimate bearing capacity of shallow foundation based on unified strength theory

作　　者：范文[1] 白晓宇[1] 俞茂宏[2] 

机构地区：[1]长安大学地质工程与测绘工程学院,西安710054 [2]西安交通大学建筑工程与力学学院,西安710049

出　　处：《岩土力学》2005年第10期1617-1622,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助研究项目(No.59924033);国土资源部岩土工程开放研究实验室资助项目(No.KF011)。

摘　　要：现有的地基临塑荷载及极限承载力公式均以Mohr-Coulomb强度理论为基础建立的,没有考虑中间主应力的效应,其计算结果一般偏小,没有充分发挥土体强度潜能。基于统一强度理论考虑中间主应力的影响,以Terzaghi公式的假设与原理为基础,导出地基极限承载力公式的一般形式,太沙基地基极限承载力公式是其特例。由于考虑中间主应力的影响,计算的地基承载力比太沙基地基极限承载力要大,可发挥土体的强度潜能,得到一系列的解答。Based on Mohr-Coulomb strength theory, the effect of intermediate principal stress is ignored by the critical pressure and the formula of ultimate bearing capacity of shallow foundation, so its results are usually smaller than real values and that the potential of soil＇s strength is not fully utilized. From unified strength theory that considers the effect of intermediate principal stress, the common formula of ultimate bearing capacity of foundation was deduced and the unified solutions was obtained. The formula of Terzaghi ultimate bearing capacity of foundation is the specific case of the unified formula. Through changing parameter of unified strength theory, a series of solutions can be obtained. The results indicate that bearing capacity of foundation is greater than Terzaghi ultimate bearing capacity of foundation because of the effect of intermediate principal stress.

关 键 词：强度理论 统一强度理论 极限承载力 中间主应力 

分 类 号：TU456[建筑科学—岩土工程]