滑带土残余强度参数试验研究

研究目的：评估滑带土残余强度，为滑坡稳定性研究和滑坡防治工程设计提供可靠的强度参数。 研究方法：滑坡现场调研，以现场大剪试验与室内土工试验为主，理论分析为辅。 研究结果：滑带土的峰值强度和残余强度比较接近，成线性关系；塑性指数能较好的用来估算残余强度。 研究结论：沿古滑坡滑动带复活或滑坡存在一定的蠕动变形情况下，滑带土的抗剪强度可近似采用残余强度值。现场试验表明，剪应力一剪位移曲线具有明显的峰值，且经过一定的剪切位移后，残余强度才出现。残余强度试验值与反算法得出的参数值较为吻合，现场试验被证明是评估滑带土残余强度的有效途径。

Experimental Research on the Residual Strength Parameters of Slip Soils

Research purposes: This paper estimates the residual strength of slip soil to provide liable strength parameters for landslide stability research and control design.Research methods:Field investigation of landslide,the field and laboratory tests are basic research methods,and theoretical analysis is secondary.Research results:Residual strength of slip soil has linear regression with peak strength;plastic index can be better used to estimate residual strength.Research conclusions:Under condition of ancient landslide revival and certain creep deformation,residual strength can be substituted for shear strength.The field test shows that there has obvious peak strength in curve of shear stress and shear displacement,residual strength appears after certain shear displacement.The strength parameters of laboratory and reverse calculation are consistent,thus it is proved that field laboratory is a good way to estimate residual strength of slip soil.