地质科技通报2025，Vol.44Issue(2)：2-13,12.DOI:10.19509/j.cnki.dzkq.tb20240388
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
摘要
Abstract
[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 network has a greater impact on slope stability under excavated slope conditions and alters the failure path and instability mechanism of the rock slope.[Conclusion]The research results provide references for excavation and support schemes for rock slopes in engineering practice and offer a theoretical basis for geological disaster prevention and control.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Key words
rock slope/random discontinuity/network simulation/determining discontinuity/probabilistic stability analysis分类
天文与地球科学引用本文复制引用
常志璐,向晖,余琦,钟敏,蒋水华,关宏涛,孟京京,黄发明..耦合确定性与随机结构面的岩质边坡概率稳定性分析[J].地质科技通报,2025,44(2):2-13,12.基金项目
国家自然科学基金项目(52222905,42407241) （52222905,42407241）
江西省自然科学基金资助项目(20242ACB221001,20232ACB204031,20224ACB204019,20242BAB20241) （20242ACB221001,20232ACB204031,20224ACB204019,20242BAB20241）
江西省水利科技计划资助项目(202325ZDKT07,202426ZDKT12) （202325ZDKT07,202426ZDKT12）
