粘性土剪切带破坏研究

The research of the damage in shear zone of viscous soil

压实粘性土是静水压力和应变率相关性材料,在低围压下表现出软化现象,在高围压下表现出硬化现象。在同一含水率,不同围压下粘性土随周围压力的增大,同一轴向应变所对应的偏应力也越大;压实度一定时,含水率越高,粘聚力越大,而摩擦角越小,粘性土的抗剪强度越弱;含水率一定时,压实度越高,粘聚力越大,而摩擦角越小,抗剪强度也越大。利用TSZ10-1.0型应变控制式三轴仪,对四川绵阳地区粘性土进行了常规三轴压缩试验,研究了不同围压和含水率下粘性土的应力-应变关系、抗剪强度指标,并对粘性土的剪切带破坏进行了拟合分析。

Compacted cohesive soil is contacted with the pressure of static water and strain rate, under low confining pressure showing soften, in high confining pressures showing harden. In the same water content, cohesive soil under different confining pressure along with the increase of confining pressure, the same axial strain corresponding to partial stress increases, degree of compaction for some time, moisture content is higher, the greater the cohesion, friction angle is smaller, the shear strength of cohesive soil is weaker;fixed water content, compaction degree taller, cohesion and friction angle is bigger, smaller, shear strength is greater. Use of type TSZIO - 1.0 strain control type three axis instrument, Sichuan Province of cohesive soil in Mianyang area were conventional triaxial compression tests, were studied in different confining pressure and water content of cohesive soil under the relationship of stress and strain, shear strength index, and the viscous soil shear zone is used to simulate the failure analysis.