考虑岩土体参数变异性的边坡确定性及概率性分析  

Deterministic and Probabilistic Analysis of Slopes Considering Variability of Geotechnical Parameters

作　　者：韩娜娜 缪文鼎 陈雪玲 胡强 Han Nana(Guizhou Equipment Manufacturing Vocational College,Guiyang,Guizhou 551499;Guizhou Transportation Planning Survey&Design Academe Co.Ltd.,Guiyang,Guizhou 550001)

机构地区：[1]贵州装备制造职业学院,贵州贵阳551499 [2]贵州省交通规划勘察设计研究院股份有限公司,贵州贵阳550001

出　　处：《江西建材》2024年第12期232-235,共4页

基　　金：贵州装备制造职业学院院级重点课题《二元结构边坡开挖稳定性分析及变形监测研究》(项目编号:ZBKY2024-2)

摘　　要：岩土体的物理力学参数一般表现出一定的空间变异性,其对准确计算边坡的安全系数有一定影响。传统的边坡设计,通常使用确定性岩土体的参数。对此,文中提出了一种评价覆盖层岩质边坡稳定性评价的有效框架。用数值方法建立了覆盖层岩质边坡模型,进行确定性分析;基于极限平衡法,采用拉丁超立方体采样法(LHS)计算覆盖层岩质边坡的破坏概率。结果表明,与黏聚力相比,内摩擦角的变异性对失效概率的影响更大;黏聚力与内摩擦角相关系数对边坡稳定性有明显的影响,岩体参数具有强相关性有利于边坡的稳定,忽略相关系数可能会高估边坡的破坏概率。The physico-mechanical parameters of geotechnical bodies generally exhibit some spatial variability,which has an impact on the accurate calculation of the factor of safety of slopes.And usually the parameters of deterministic geotechnical bodies are used in the traditional slope design.To address this,an effective framework for evaluating the stability assessment of overburden rocky slopes is proposed in this paper.The overburden rocky slope model was established by numerical methods for deterministic analysis;based on the limit equilibrium method,the damage probability of the overburden rocky slope was calculated by the Latin Hypercube Sampling(LHS)method.The results show that the variability of the internal friction angle has a greater influence on the failure probability compared with the cohesion;the correlation coefficient between the cohesion and the internal friction angle has a significant influence on the slope stability,and the strong correlation of the rock parameters is beneficial to the stability of the slopes,and ignoring the correlation coefficient may overestimate the damage probability of the slopes.

关 键 词：堆积体边坡 变异系数 相关系数 

分 类 号：TU43[建筑科学—岩土工程]