基于滑移线理论的非饱和土条形地基承载力计算  

Calculation of Bearing Capacity of Unsaturated Soil Strip Foundation Based on Slip Line Theory

作　　者：侯超群 石恭泽 孙志彬 席瑶 HOU Chao-qun;SHI Gong-ze;SUN Zhi-bin;XI Yao(School of Automobile and Transportation Engineering,Hefei University of Technology,Anhui 230009,China)

机构地区：[1]合肥工业大学汽车与交通工程学院,合肥230009

出　　处：《长江科学院院报》2020年第6期141-146,152,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51408180)。

摘　　要：为了对非饱和土平地地基的极限承载力进行理论计算和定性分析,对非饱和土条形地基的承载力进行了计算,将基质吸力和有效应力系数引入平衡方程,构建含有非饱和参数的滑移线方程,并采用滑移线法将得到的非饱和土滑移线方程改为差分方程进行求解。综合讨论了黏聚力、内摩擦角、地下水位及垂直不饱和流速对非饱和土条形地基承载力的影响,并计算了不同情况下的非饱和土条形地基承载力,得出非饱和土平地地基的极限承载力和平均承载力均要大于饱和土地基。计算所使用的基质吸力不是一个定值,更符合实际情况,研究成果为非饱和土地基承载力计算提供了一种参考。To accomplish theoretical calculation and qualitative analysis on the ultimate bearing capacity of the flat foundation of unsaturated soil,the bearing capacity of strip foundation in unsaturated soil are calculated.The matric suction and effective stress coefficient are introduced into the equilibrium equation to obtain the slip line equation containing unsaturated parameters,which is further altered into difference equation using the slip line method.The effects of cohesion,internal friction angle,groundwater level and vertical unsaturated velocity on the bearing capacity of strip foundation of unsaturated soil are discussed comprehensively,and the bearing capacity of strip foundation of unsaturated soil under different conditions is calculated.Results show that the ultimate bearing capacity and the average bearing capacity of unsaturated soil flat foundation are greater than those of saturated soil foundation.The matric suction used in the calculation is not a fixed value,but is more in line with the actual situation,hence providing a reference for the calculation of bearing capacity of unsaturated soil foundation.

关 键 词：非饱和土 条形地基 地基承载力 滑移线法 差分方程 

分 类 号：U416[交通运输工程—道路与铁道工程]