基于广义Hoek-Brown准则的多参数强度折减法在边坡稳定性分析中的应用

岩体边坡稳定性问题是岩石力学领域一个长期存在的课题,基于有限元强度折减法的边坡稳定性分析,由只考虑内摩擦角与黏聚力的传统抗剪强度折减法,发展到包括变形参数和强度参数在内的多参数协调折减方法.针对有限元强度折减法研究成果及其存在的不足,考虑岩体弹性模量的沿深度递增关系,基于Hoek-Brow n准则提出一种针对弹性模量进行折减的方案;结合边坡算例进行稳定性计算,通过ANSYS建立有限元模型,以塑性区贯通作为边坡失稳判据,模拟岩石边坡的渐进劣化失稳破坏.将计算安全系数与传统抗剪强度折减法所得到的安全系数进行比较,证明所提出的折减方法用于边坡劣化折减计算切实可行.

Discussion on Applications of the Multi-parameter Reduction Method for Analyzing Slope Stability Based on the Generalized Hoek-Brown Criterion

The stability of rock slope is a long-standing problem in the field of rock mechanics. The slope stability analysis based on the finite element strength reduction method has developed from the traditional shear strength reduction method which only considers the internal friction angle and cohesion to the multi parameter coordinated reduction method including deformation parameters and strength parameters. According to the research results of finite element strength reduction method and its shortcomings, considering the increasing relationship of elastic modulus along the depth of rock mass, based on Hoek Brown criterion, a reduction scheme for elastic modulus is proposed. Combining with the slope calculation example, the finite element model is established by ANSYS, and the progressive deterioration failure of rock slope is simulated by taking the plastic zone penetration as the slope instability criterion. Compared with the safety factor obtained by traditional shear strength reduction method, it is proved that the proposed reduction method is feasible for slope deterioration reduction calculation.