块体理论与数值模拟结合应用于块裂岩质边坡稳定性分析

Combined Application of Block Theory and Numerical Simulation in the Stability Analysis of Rocky Slope with Block Fracture

由于结构面的存在,块裂岩质边坡的完整性遭到破坏,并且岩体的力学性质和应力分布也直接受到影响,因此块裂岩质边坡稳定性分析十分复杂。块体理论是近年来发展和完善的一种适合于岩体稳定性分析的较行之有效的分析方法。但块体理论不能充分反映岩体结构面间的相互作用,而数值分析模拟具有可充分考虑岩体结构面间的相互作用的特点。应用块体理论,判识可移动块体类型及失稳模式,在确定可移动块体的基础上,结合数值分析模拟,对边坡稳定性进行分析,并且揭示块裂岩质边坡的失稳机理,为块裂岩质边坡稳定性分析提供一条新途径。

The existence of structural planes destroys the integrity of rocky slope with block fracture, which can directly affect the mechanical properties and stress distribution of rock mass, making the stability analysis of such slope very complex. The block theory is an efficient analysis method suitable for rock mass stability, which has been developed and improved in recent years. However, the block theory can not fully reflect the interaction between the structural planes of rock mass while numerical simulation can give a full consideration to this. In this paper, the block theory is used to identify the type and instability mode of movable blocks and, on the basis of the determination of movable blocks, the numerical simulation is also used to assist the analysis of slope stability and reveal the instability mechanism of rocky slope with block fracture, thus providing a new approach to the stability analysis of such slope.