中文摘要：

土石混合体是一种由强度较高岩块、强度较低的土体充填成分及相应孔隙等多相体系组成的复杂地质材料。我国中西部地区诸多地质灾害的发生均与其抗剪强度密切相关。影响土石混合体力学性能的因素很多。本文采用柔性边界条件下的大型剪切实验,从含石量、块石排列、块石尺寸三个方面研究了块石对土石混合体力学性能的影响。通过正交实验确定了3种因素对土石混合体抗剪强度的影响顺序及各因素的显著性水平,研究发现在这3个影响因素中,块石尺寸对土石混合体抗剪性能的影响最大,含石量次之,块石排列的影响最小。

英文摘要：

Soil-rock mixture,which is made from such as high strength rock-block,low strength soil filling ingredient and corresponding pores,is a kind of complex multi-phase geological materials.Many geological disasters occurred in Chinese central and western regions are close related with its shear strength.The mechanical properties of soil-rock mixture are affected by many factors.In this paper,using large-size shear test under flexibility boundary condition,the influence of rock on shearing strength of soil-rock mixture was studied from three aspects： such as rock content,rock arrangement and size of block-stone.Through orthogonal test,the essentiality and its significance of above-mentioned three factors were studied.Results show that among three factors the size of block-stone has most important influence on the shear properties of soil-rock mixture,the stone content takes the second position,and the arrangement of block-rocks takes the third one.