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锁儿头滑坡属特大型断层破碎带滑坡。该滑坡滑带土主要由强风化的中、上志留统千枚岩、板岩等构成,滑带土中粒径大于2 mm的颗粒含量约为30%,在滑带土颗粒组成中占有重要地位,其强度特征对滑坡体的稳定性分析具有重要影响。为此,利用室内大型直剪仪对不同含水率下锁儿头滑坡滑带土的剪切特性进行试验研究,结果表明,在控制干密度为1.7 g/cm3情况下,不同含水率滑带土试样的剪应力-应变关系均呈现出弱应变硬化特征,而且法向压力越大,应变硬化特征越明显;在剪应变ε为10%时,相同含水率下滑带土剪切模量G0.1随法向压力的增大而增大,同一法向压力下的剪切模量G0.1与含水率间呈负线性相关关系;利用邓肯-张双曲线模型对锁儿头滑坡滑带土不同含水率下大剪试验剪应力-应变关系进行数据拟合,拟合效果良好,但该模型不能反映土的应变软化性质。
Lock child head landslide is a very large fault broken landslide. The landslide slippery zone mainly consists of strong weathered middle-upper Silurian phyllite and slate. The content of particles with a diameter of more than 2 mm in the sliding zone is about 30%, which occupies in the composition of the sliding zone soils Important position, the strength characteristics of the stability of landslide has an important impact analysis. Therefore, the shear characteristics of landslide landslide in the Jier’ertou landslide with different moisture content were studied by means of a large indoor direct shear tester. The results show that under the control of the dry density of 1.7 g / cm3, The shear stress-strain relationship of the specimens shows the characteristics of weak strain hardening, and the greater the normal pressure is, the more obvious the strain hardening characteristics are. The shear modulus G0 of soil with the same water content is the same when the shear strain ε is 10%. 1 increases with the increase of the normal pressure, and the shear modulus G0.1 under the same normal pressure has a negative linear relationship with the water content. By using the Duncan-Chang hyperbolic curve model, According to the shear stress-strain relationship of large shear tests under different water contents, the fitting results are good, but the model can not reflect the strain softening properties of soil.