摘要
裂隙岩质高边坡稳定性的变形破坏模式实际上取决于其岩体结构特征所控制的潜在路径形式。在复杂裂隙岩体结构边坡中,不同类型和规模的陡缓结构面交切组合将其破坏路径更加不确定化。复合岩体技术(synthetic rock mass,SRM)可有效实现受结构控制的滑移破坏。遵循该理念指导,以西南某水电工程复杂裂隙岩质高边坡为例,采用颗粒离散元PFC软件平台研发的SRM技术,解决了利用均质区划分为基础的非均匀分布的规模不同的陡缓结构面复杂网络模型构建、考虑颗粒尺寸效应范围的不同工程地质性状岩石材料模型构建、以及结合重度增加法计算复合岩体模拟裂隙岩质高边坡潜在失稳路径的技术难题,收效颇丰。模拟结果表明:该边坡潜在失稳的主要路径为陡倾的断层、岩脉与倾向坡外的长大中缓倾角裂隙组合形成阶梯状形式,其潜在失稳路径以浅表局部的剪切–拉张失稳模式为主,为该工程后续的边坡设计提供了可靠的边界范围和指导意义。本项研究方法和结论具有可观的推广价值和普适性。
The deformation failure mode of fractured rock slope is actually determined by the potential paths controlled by the structural characteristics of rock mass. In the complex fractured rock slopes,the intersections of structural planes with different types,sizes and dip angles make the damage paths more uncertain. The method of synthetic rock mass（SRM） can achieve effectively the structurally controlled sliding damage. A complex fractured high rock slope at a hydropower station in southwest China is studied in this paper with the method. The SRM developed with the Particle Discrete Element PFC software is adopted to solve a series of technical problems,including the construction of a complex discrete fracture network model in different sizes and dip angles based on the non-uniform distribution of homogeneous zones,the construction of rock material models with different geological properties considering the range of particle size effects,and the calculation of the potential failure paths of fractured rocky high slope simulated by SRM and combined with the weight increasing method. The results indicate that the potential failure paths of the slopes are mainly step-shaped and formed due to steep-dip faults,dykes,or joints,and gentle-to-middle dip joints. The potential failure paths are dominated by the shallow local shear-tension instability mode.
作者
赵伟华
黄润秋
ZHAO Weihua;HUANG Runqiu(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology Chengdu,Sichuan 610059,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2018年第8期1843-1855,共13页
Chinese Journal of Rock Mechanics and Engineering
基金
国家创新研究群体科学基金(41521002)
国家科技支撑计划(2015BAK09B01)~~
关键词
边坡工程
裂隙岩质边坡
岩体结构网络模型
复合岩体
潜在失稳路径
slope engineering： fractured rock slope： discrete fracture network
synthetic rock mass： potentialfailure path
