金坪子滑坡Ⅱ区千枚岩碎屑土滑带土工程特性研究

摘要

通过对金坪子滑坡Ⅱ区千枚岩碎屑土滑带土的室内试验,分析含水率对滑带土剪切强度的影响规律.这对研究滑带土的工程特性,分析滑坡及滑动带的强度具有重要意义.研究表明:该滑带土伊利石含量较高,强度受水影响较大；三轴剪切破坏后没有明显的剪切面；应力应变曲线总体上表现为硬化型,且呈现出明显的非线性；滑带土粘聚力c和内摩擦角ψ与含水率均成线性关系,随着含水率的增大,粘聚力c和内摩擦角ψ 都是是线性减小的,并通过线性回归计算得出了抗剪强度随含水率的线性关系式.%By testing the phyllite clastic soil from the sliding soil at Jinpingzi Sliding Zone II , the effect of moisture content on sliding soil's shear strength is studied. The results are of great significance to study the engineering characteristics of sliding soil and analyze the strength of landslide and sliding area. The research results show that this sliding soil has the high content of illite, its shear strength is highly affected by water, there is no clear shear damage plane during triaxi-al test, and the stress-strain relation curves show hardening feature and nonlinear modulus. Both of the cohesive strength c and friction angle φ are linearly correlated with the moisture content of sliding soil, and both of them are decreased with the increasing of moisture content. Then, the linear relation functions of shear strength and moisture content are derived by linear regression calculations.