摘要
基于极限分析上限法理论,并考虑地震荷载效应,对双组节理顺层岩质边坡的稳定性进行分析.结合强度折减技术给出了岩石边坡安全系数的计算公式,采用序列二次规划法(SQP)对安全系数F_s的目标函数进行优化计算;在不同地震荷载作用下,将极限分析上限法计算的结果与离散元数值模拟的结果进行对比验证,二者所计算出的安全系数较为接近,最大误差不超过4%,且滑动面也较为吻合,表明了该方法的正确性.参数分析表明:坡高、节理内摩擦角、节理倾角组合以及地震效应均对边坡安全系数及潜在临界滑裂面有重要影响.
Based on the upper bound limit analysis method and by considering the seismic load effect, the stability of two sets of jointed consequent rock slope is analyzed. Then, by integrating a strength reduction technique, a cal- culation formula of the safety factor of two sets of jointed consequent rock slope is put forward, and the objective function of the safety factor Fs is optimized by means of the nonlinear sequential quadratic programming method. Fi- nally, under different seismic loads, the slope safety factor obtained through the upper bound limit analysis method is compared with the results obtained through the discrete element method. It is found that the two kinds of results are close to each other, with a relative error of less than 4% , and the corresponding sliding surfaces are also simi- lar, which demonstrates the rationality and reliability of the proposed method. Parametric analysis shows that the slope height, the internal friction angle of the joints, the joint angle combination and the seismic loading all have significant effects on the slope safety factor and the potential critical slip surface.
作者
宋祉辰
赵炼恒
李亮
谢荣福
唐高朋
SONG Zhi-chen ZHAO Lian-heng LI Liang XIE Rong-fu TANG Gao-peng(School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第12期135-143,150,共10页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51208522)
贵州省交通运输厅科技项目(2012122033
2014122006)
中南大学研究生自主探索创新项目(2016zzts413)~~
关键词
极限分析上限法
离散元法
地震荷载
序列二次规划法
岩质边坡
安全系数
upper bound limit analysis method
discrete element method
seismic load
sequential quadratic pro- gramming method
rock slope
safety factor
作者简介
宋祉辰（1991-），男，博士生，主要从事道路与铁道工程、极限分析等研究．E-mail：songzhichen1219@163．com
通信作者：赵炼恒（1980-），男，博士后，教授，博士生导师，主要从事道路与铁道工程、岩土极限分析理论与应用等研究E-mail：zlh8076@163．com
