砾质滑带土剪切特性试验研究

Experimental Study on Shear Characteristics of Gravelly Slip Soil

砾质滑带土在三峡库区内的滑坡中广泛存在,其剪切特性对滑坡的稳定起着控制作用。采用人工重塑土样模拟三峡库区某典型滑坡中的砾质滑带土,进行直剪试验,探讨了砾石含量、砾石级配、砾石种类等因素对砾质滑带土剪切强度参数及剪切强度的影响,并根据正交试验理论,采用极差分析法,获得了各影响因素对砾质滑带土剪切强度参数的敏感性大小排序。对于内摩擦角,各因素影响大小排序为:砾石含量>砾石级配>砾石种类;对于黏聚力,各因素影响大小排序为:砾石级配>砾石含量>砾石种类。

The gravelly slip soils widely exist in the landslide of the Three Gorges Reservoir area,and its shear properties determine the stability of landslide.Gravelly slip soils from a typical landslide in the Three Gorges Reservoir Area typical were simulated by the artificial remolded sample.A direct shear test was carried out to discuss the effect of gravel concentration,gravel grading and gravel type on the shear strength parameters and shear strength of gravelly strip soil.According to the orthogonal test theory and range analysis,the sensitivity of the shear strength parameters in gravelly slip soil was ranked for each factor.For the internal friction angle,the influence ranking of each factor is:gravel concentration > gravel grading > gravel type;and for the cohesion,ranking is:gravel grading > gravel concentration > gravel type.