地基承载力确定的一种方法
摘要:根据三轴和直剪试验的特点并以Mohr强度理论为基础建立了Mohr包线的曲线形式。基于弹性理论导出了条形地基在均布荷载作用下塑性区方程,根据方程可以确定临塑荷载及塑性区的范围。与基于直线型Mohr-Coulomb准则建立起来的塑性区方程相比,该方程能反映土体抗剪强度增长随正应力增加逐渐趋缓的特点。算例分析表明:按两种方法计算得出的临塑荷载相差不大,塑性区连成一片时的荷载也基本一致;两种方法得出的塑性区的形状极为相似;随荷载增加,塑性区向下发展的速度比按传统方法得出的结果稍慢。
Abstract:No linear qualities of triaxiat tests results and direct shear tests results encourage a proper curve to be constructed to illustrate soils' limit equilibrium state based on Mohr envelope. With the application of elastic theory, equations are derived to calculate plastic range of ground under band-load operation, and then, critical load and plastic zone can be obtained. Several conclusions on the shape and size of plastic zone induced by band-load can be got after the comparison, which is performed between results respectively from the two methods. Even the difference between the shape and the size of the two kinds of plastic zone created by the same load is small and the two critical loads have the similar character, plastic zone increment with increasing upper load is quicker when the proposed method is applied.
中文标题：
地基承载力确定的一种方法
A Method to Determine Subgrade Bearing Capacity
作者：
李顺群1,2,王英红3,刘双菊1,2
Li Shunqun1,2,Wang Yinghong3,Liu Shuangju1,2
作者简介:李顺群,1971年生,男,汉族,河南卫辉人,博士,副教授,从事数值分析和非饱和土力学等方面的研究工作。E-mail:lishun-qun@sina.com
通讯地址：
1. 天津城市建设学院土木工程系, 天津 300384; 2. 天津市软土特性与工程环境重点实验室, 天津 300384; 3. 天津城市建设学院电子与信息工程系, 天津 300384
1.DepartmentofCivilEngineering,TianjinInstituteofUrbanConstruction,Tianjin300384; 2.TianjinKeyLaboratoryofSoftSoilCharacteristicsandEngineeringEnvironment,Tianjin300384; 3.DepartmentofElectronandInformationEngineering,TianjinInstituteofUrbanConstructiontTianjin300384,China
中图分类号:TU431
出版物：岩土工程技术
收稿日期:2008-08-25
关键词:地基承载力,Mohr强度理论,极限平衡,弹性理论
Key words:subgrade bearing capacity,Mohr strength theory,limit equilibrium,elastic theory
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基金项目：
基金项目: 天津市高等学校科技发展基金计划项目(20071005)
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