块石空间分布对土石混合体边坡稳定性的影响

土石混合体是自然界中分布广泛的一种地质材料, 受组分多样性, 块石粒径大小不一和块石空间分布位置随机等因素的影响, 其物理力学性质十分复杂。在土石混合体边坡的稳定性分析中, 以往大多将其简化为均匀地质体结构而不考虑块石的影响。该文采用有限元强度折减法, 对土体和四种不同类型块石分布的土石混合体边坡分别在自重状态(准静态)和打桩作用(动态)下的稳定性进行了分析, 探讨了块石空间分布对剪切带和边坡稳定性的影响。计算结果表明, 土石混合体边坡内的剪切带具有明显的绕石效应, 位于土石混合体边坡内部不同位置处的块石对边坡稳定性产生的影响不同。

EFFECTS OF ROCK SPATIAL DISTRIBUTIONS ON STABILITY OF ROCK-SOIL-MIXTURE SLOPE

Soil-rock-mixture is widely distributed in nature. Due to its variety in component, difference in rock’s size and random distribution of rocks, the physical and mechanical properties of soil-rock-mixture are very complex. In previous studies of stability analysis of soil-rock-mixture slope, the slope was usually simplified as homogeneous soil materials without considering the influence of rocks. In the present work, the shear band of soil and four different kinds of soil-rock-mixture slopes under gravity (quasi-static case) and pile driving load (dynamic case) are analyzed, respectively. Using the strength reduction method in the finite element simulation, the influences of rocks and their spatial distributions on the slope stability are discussed. The results show that the shear band of soil-rock-mixture slope has obvious rounding rock effect, and different locations of rocks have different effects on the stability of rock-soil-mixture slope.