中南大学学报（自然科学版）2016，Vol.47Issue(12)：4189-4196,8.DOI:10.11817/j.issn.1672-7207.2016.12.030
线性吸力下非饱和土地基临界荷载统一解
Unified solution of critical load for foundation in unsaturated soils under linear suction
摘要
Abstract
On the basis of the unified solution of shear strength for unsaturated soils in the plane strain condition, a unified solution of critical load for foundation in unsaturated soils under linear suction was derived, which took both matric suction and intermediate principal stress into account and was suitable for any lateral pressure coefficient. Comparability analysis and parametric studies were carried out. The unified solution of critical load obtained in this study can be reduced to many existing results, particularly for uniform suction, and thus has a broad applicability. The results show that the effect of matric suction and its distribution on critical load is significant, and the effect with linear suction is not as obvious as that with uniform suction;the strength theory effect for critical load is important, and the design and construction of foundation with use of Mohr-Coulomb failure criterion are theoretically conservative;for unsaturated soils under normal consolidation or general over-consolidation, the critical load with lateral pressure coefficient of 1 is higher;the intermediate principal stress effect should be fully considered and an appropriate lateral pressure coefficient is to be chosen;the matric suction and its distribution should be monitored in situ and some effective measures are adopted to ensure the stability of matric suction. This proposed result can provide a theoretical basis for the bearing capacity determination and optimization design of foundation in unsaturated soils, and therefore has a good prospect of engineering applications.关键词
非饱和土/临界荷载/吸力分布/中间主应力/侧压力系数Key words
unsaturated soils/critical load/suction distributions/intermediate principal stress/lateral pressure coefficient分类
建筑与水利引用本文复制引用
张常光,范文,赵均海,曾开华..线性吸力下非饱和土地基临界荷载统一解[J].中南大学学报（自然科学版）,2016,47(12):4189-4196,8.基金项目
中国博士后科学基金资助项目(2016T90879)；陕西省自然科学基础研究计划项目(2015JM4146)；江西省自然科学基金资助项目(20142BAB206001)；江西省教育厅科学技术研究项目(GJJ151117)(Project(2016T90879) supported by the China Postdoctoral Science Foundation （2016T90879）
Project(2015JM4146) supported by the Natural Science Foundation for Basic Research of Shaanxi Province, China （2015JM4146）
Project(20142BAB206001) supported by the Natural Science Foundation of Jiangxi Province, China （20142BAB206001）
Project(GJJ151117) supported by the Science and Technology Program for Jiangxi Educational Committee, China) （GJJ151117）
