基于非线性Barton-Bandis准则的岩质边坡可靠度研究  

Study on Reliability of Rock Slope Based on Nonlinear Barton-Bandis Criterion

作　　者：罗伟[1,2] 荣耀 刘安 耿大新 曾润忠[1] LUO Wei;RONG Yao;LIU An;GENG Da-xin;ZENG Run-zhong(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang Jiangxi 330013,China;Jiangxi Transportation Institute,Nanchang Jiangxi 330200,China;Jiangxi Transportation Consulting Co.,Ltd.,Nanchang Jiangxi 330008,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]江西省交通科学研究院,江西南昌330200 [3]江西交通咨询有限公司,江西南昌330008

出　　处：《公路交通科技》2020年第4期32-36,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51078359);江西省交通运输厅科技项目(2016C0007,2016C0058);江西省青年科学基金项目(20171BAB216048);江西省岩土工程基础设施安全与控制重点实验室项目(20161BCD40010)。

摘　　要：岩质边坡稳定性分析是岩土工程研究领域的热点问题之一,采用线性Mohr-Coulomb破坏准则和确定性分析方法研究岩质边坡稳定性存在一定的局限性。基于Hoek和Bray提出的典型平面岩质边坡破坏模式,采用Barton-Bandis非线性破坏准则,考虑岩质边坡滑动过程静力平衡条件,推导出岩质边坡安全系数表达式,并结合可靠度理论,通过MATLAB编程优化计算得到岩质边坡可靠度指标。算例分析结果表明:可靠度理论与数值模拟的计算结果吻合良好,证明本研究方法的可行性和有效性;Barton-Bandis非线性破坏准则中摩擦角φb、结构面粗糙系数JRC和结构面有效抗压系数JCS对岩质边坡稳定性有着显著影响,且岩质边坡稳定性随着φb,JRC和JCS的增加而提升;随机变量参数φb,JRC和JCS对岩质边坡稳定性影响程度不一,其中φb和JRC对岩质边坡稳定性的影响较为显著,而JCS对岩质边坡稳定性的影响相对较小;岩质边坡稳定性随着φb,JRC和JCS变异系数的增加而降低;后缘裂缝地下水位上升,岩质边坡的失效概率显著增大,坡体内部应该设置完善的排水系统。The analysis on stability of rock slope is one of the hottest topics in the research of geotechnical engineering. It is sure that limitations exist in the research by using linear Mohr-Coulomb failure criterion and deterministic analysis method. Based on the failure mode of typical planar rock slope proposed by Hoek and Bray, by adopting Barton-Bandis nonlinear failure criterion and considering the static equilibrium condition of sliding process of rock slope, the expression of safety factor of rock slope is derived. Combining with reliability theory, the reliability indicator of rock slope is obtained through MATLAB programming optimization. The example analysis result indicates that the result of reliability theory is in good agreement with that of numerical simulation, which proves the feasibility and effectiveness of the proposed method;In the Barton-Bandis nonlinear failure criterion, friction angle φb, structural plane roughness coefficient JRC and structural plane effective compression coefficient JCS have significant influences on the stability of rock slope, and the slope stability increases with φb, JRC and JCS;These 3 random variable parameters affect the stability of rock slope differently, among them, the influences of φb and JRC on the slope stability are more significant, while JCS has relatively less influence on it;The stability of rock slope decreases with the increase of φb, JRC and JCS;The failure probability of rock slope increases significantly with the rise of groundwater level in the trailing edge crack, thus, a refined drainage system should be set up inside the slope.

关 键 词：道路工程 边坡稳定性 可靠度理论 岩质边坡 Barton-Bandis准则 

分 类 号：U418.52[交通运输工程—道路与铁道工程]