增湿时粉土的抗剪强度特性研究  

STUDY ON SHEAR STRENGTH CHARACTERISTICS OF SILT DURING MOISTENING PROCESS

作　　者：范春青[1] 王想勤[1] 肖军华[2] 

机构地区：[1]广州市城市规划勘测设计研究院,广州510060 [2]南京工业大学土木工程学院,南京210009

出　　处：《低温建筑技术》2010年第4期20-22,共3页Low Temperature Architecture Technology

摘　　要：采用固结不排水剪切方法,对粉土进行了增湿情况下的三轴剪切试验。试验结果表明,随着初始含水率增加,粉土试样的变形破坏逐渐由脆性特征转变为延性特征;极限抗剪强度随着围压增加线性增大,随着含水率增加非线性降低;同时,随着初始含水率增加,粉土的黏聚力显著减小,但内摩擦角减少并不明显,且抗剪强度指标与初始含水率均呈负幂指数关系变化。The consolidated undrained triax.ial test was carried out on silt in the case of moistening. It is found that with the initial moisture content increased, the deformation and failure of silt specimen gradually change from the brittle characteristics to ductile characteristics. Moreover, the ultimate shear strength of silt increases linearly with the increase of the confining pressure, and decreases nonlinearly with the increase in moisture content. And the cohesion of silt reduces remarkably with the increase in moisture content, but the internal friction angle decreases insignificantly, however, the shear strength index of silt present a negative exponential relationship with the initial moisture content.

关 键 词：粉土 增湿 抗剪强度 三轴试验 

分 类 号：TU416[建筑科学—岩土工程]