福建非饱和花岗岩残积土强度特性的试验研究  

Test and Study on Strength Characteristics of Unsaturated Granite Residual Soil in Fujian Province

作　　者：阙云[1] 姚晓琴[1] 陈祖鑫[1] 林登辉[1] 

机构地区：[1]福州大学土木工程学院,福州市350108

出　　处：《公路》2012年第6期185-190,共6页Highway

基　　金：福建省自然科学基金;项目编号2009J05121;2009J01249;福建省教育厅科研资助项目;项目编号JA08016;福州大学人才基金资助项目;项目编号XRC-0814

摘　　要：为了解非饱和花岗岩残积土强度特性,以福建地区典型花岗岩残积土为例,采用应变控制式三轴仪对3种土样分别进行不同含水量和围压条件下的固结不排水和不固结不排水试验,并探讨了吸力对抗剪强度的贡献。试验结果表明:花岗岩残积土的应力-应变关系为强化型;剪切破坏以轴向应变过大引起的中部鼓出为主,出现剪切破坏的较少;UU试验指标与CU指标大小之间不存在单一的关系;黏粒含量对黏聚力的影响极为显著;吸力强度与非饱和度的倒数之间呈良好的线性关系。In order to explicit the strength properties of unsaturated granite residual soil in Fujian Province,a series tri-axial consolidated un-drain tests and tri-axial non-consolidated un-drain tests for three kinds of soil samples are carried out under different water content and confining pressures by using control triaxial compression apparatus,and the contribution of the suction against shear strength are discussesed.The results show that：the type of stress-strain curves of granite residual soil belongs to strengthened;the shear failure state of granite residual soil is mainly because of excessive axial strain and bloating in middle;the indexs between UU test and CU test does not exist single relations;clay contend has significant effects on cohesion;there is a linear relationship between suction strength and reciprocal of saturation.

关 键 词：花岗岩残积土 强化型 三轴剪切试验 吸力强度 饱和度 

分 类 号：U414.103[交通运输工程—道路与铁道工程]