低饱和度非饱和土的抗剪强度理论及其应用  

Study on shear strength of the unsaturated soils in pendular state and its application

作　　者：贾其军[1] 赵成刚[2] 韩子东 

机构地区：[1]北京国道通公路设计研究院,北京100053 [2]北京交通大学土木建筑工程学院,北京100044 [3]北京中咨华科交通工程技术有限公司,北京100037

出　　处：《岩土力学》2005年第4期580-585,共6页Rock and Soil Mechanics

摘　　要：从非饱和土的微观结构入手,提出并推导了土颗粒间毛细吸力引起的基质吸力与附加有效应力关系的近似解,并进一步得到了低饱和度非饱和土的抗剪强度公式。通过试验资料和理论分析验证了所推公式的合理性、正确性。最后分析了土颗粒半径差异、土体平均粒径大小对非饱和土强度的影响。Based on the micromechanical structure, an approximate equation between the increase of normal stress and suction due to capillarity in unsaturated assemblies of unequal-sized spheres is proposed and derived; and then the shear strength of unsaturated soils in pendular stage is derived also. All the equations derived have been verified by experiments and theoretical analysis. At last, the effect of soil gradation on the shear strength of unsaturated soils is analyzed qualitatively.

关 键 词：非饱和土 气连通状态 基质吸力 有效应力 抗剪强度 

分 类 号：TU411.3[建筑科学—岩土工程]