夯实高饱和度地基土的强度特性  

Strength behaviour of unsaturated compacted silt with high-saturated degree under controlled suction conditions

作　　者：李占强[1] 杨为民[2] 赵常州[1] 

机构地区：[1]中国地质大学工程技术学院,北京100083 [2]安徽理工大学资环系,淮南232001

出　　处：《北京科技大学学报》2005年第2期150-155,共6页Journal of University of Science and Technology Beijing

基　　金：河北省建设科技研究资助项目(No.2003-249)

摘　　要：运用改进的非饱和土三轴仪,对某地税大楼强夯后高饱和度地基土进行了控制吸 力条件下的固结排水剪切实验.实验结果表明,基质吸力对非饱和土的强度特性有重要影响, 抗剪强度参数有效内聚力和有效内摩擦角都与吸力呈良好的线性关系.随吸力增加,有效内 聚力呈线性增加,而有效内摩擦角则相应地减小.在实验吸力的范围内,有效内聚力受吸力 的影响比有效内摩擦角更明显.而实验土的破坏包线并不是平面,它随净平均应力和吸力的 增高而呈收敛状,说明对这种高饱和度击实粉土,当围压加至300kPa以上时,吸力对强度的 增长不再明显,此时围压将起主导作用.Under controlled suction conditions, CD shear tests were conducted using a modified triaxial shear apparatus on dynamic compacted unsaturated silt from the foundation of the Local-Tax Building in Shijiazhuang city, China. The test results clearly demonstrated that suction severely influences the shear strength of the soil. The relationships of the effective cohesion and the friction angle to the suction are well linear. The effective cohesion increases and the friction angle decreases with increasing suction. In a given suction range, the influence of the suction on the effective cohesion is more evident than the friction angle. The failure envelope of the compacted silt is not a plane, which shows convergent with increasing the net average stress and the suction. When the confining pressure is higher than 300 kPa, it plays the leading role on strength, not the suction.

关 键 词：非饱和土 吸力 夯实粉土 应力应变关系 强度 

分 类 号：P642.116[天文地球—工程地质学]