耦合确定性与随机结构面的岩质边坡概率稳定性分析  

Probabilistic stability analysis of rock slopes with coupled determining and random discontinuities

作　　者：常志璐 向晖 余琦 钟敏 蒋水华 关宏涛 孟京京 黄发明 CHANG Zhilu;XIANG Hui;YU Qi;ZHONG Min;JIANG ShuiHua;GUAN Hongtao;MENG Jingjing;HUANG Faming(School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China;School of Resources&Environment,Nanchang University,Nanchang 330031,China;China State Construction Railway Investment&Engineering Group Co.,Ltd.,Beijing 102600,China)

机构地区：[1]南昌大学工程建设学院,南昌330031 [2]南昌大学资源与环境学院,南昌330031 [3]中建铁路投资建设集团有限公司,北京102600

出　　处：《地质科技通报》2025年第2期2-13,共12页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(52222905,42407241);江西省自然科学基金资助项目(20242ACB221001,20232ACB204031,20224ACB204019,20242BAB20241);江西省水利科技计划资助项目(202325ZDKT07,202426ZDKT12)。

摘　　要：岩质边坡广泛发育确定性结构面和随机结构面,使得岩体具有不连续性和非均质性特征,直接影响边坡的稳定性、变形特征和破坏模式。然而,目前研究较少同时考虑确定性结构面和随机结构面网络对岩质边坡概率稳定性分析和破坏机制的影响。采用离散元方法和结构面网络模拟技术,构建了边坡确定性结构面和随机结构面耦合分析模型,并基于此提出了边坡概率稳定性分析方法,最后以简化岩质边坡模型和锦屏一级水电站左岸坝肩边坡(天然和开挖工况)为例,验证了该方法的有效性。结果表明:(1)提出的方法不仅可以准确模拟确定性结构面与随机结构面网络,而且实现了结构面网络与边坡模型耦合建模;(2)同时考虑确定性结构面和随机结构面边坡概率稳定性分析方法可以获得边坡稳定系数概率分布图,计算结果更全面并符合工程实际;(3)随机结构面网络在开挖边坡工况下对边坡稳定性影响更显著,并且控制边坡的失稳路径和破坏机制。研究成果可为制定岩质边坡开挖和支护方案提供参考,同时为地质灾害防治提供理论依据。[Objective]Stability analysis of rock slopes is crucial for ensuring the normal construction and safe operation of engineering facilities.Instability of slopes can cause severe casualties and economic losses.The widespread presence of determining and random discontinuities within rock slopes leads to rock mass discontinuity and heterogeneity,significantly affecting slope stability,deformation characteristics,and failure modes.Therefore,studying the development characteristics of discontinuities and their influence on slope stability is vital for slope protection and disaster prevention.However,existing studies rarely consider both determining discontinuities and random discontinuity networks when constructing rock slope models for probabilistic stability analysis and failure mechanisms.[Methods]In this study,a three-dimensional numerical slope model was constructed using Rhino software.The discrete fracture network(DFN)model was applied to generate both determining and random discontinuity networks based on field discontinuity data.A coupling analysis model for random discontinuities was then developed by integrating the slope model and discontinuity networks via 3DEC software.A probabilistic stability analysis method was proposed to analyze the effects of random discontinuities on slope stability.Finally,the proposed method was demonstrated using a simplified rock slope model to assess the impact of random discontinuity networks on slope stability,along with a probabilistic stability analysis of the left bank shoulder slope of the Jinping I Hydropower Station under natural and excavated slope conditions.[Results]The results indicate that(1)The proposed method effectively and accurately simulates both the deterministic and random discontinuity networks,as well as coupling the discontinuity network with the rock slope model.(2)The probabilistic distribution of the slope stability coefficient can be obtained,and the results are more comprehensive and aligned with engineering practice.(3)The random discontinuity net

关 键 词：岩质边坡 随机结构面 网络模拟 确定性结构面 概率稳定性分析 

分 类 号：P642.22[天文地球—工程地质学]