基于Hoek-Brown非线性强度准则的节理岩坡稳定性分析全局优化算法  

Global optimization method for jointed rock slope stability analysis based on Hoek-Brown nonlinear strength criterion

作　　者：陈昌富[1] 朱剑锋[1] 

机构地区：[1]湖南大学岩土工程研究所,长沙410082

出　　处：《水文地质工程地质》2006年第5期17-21,共5页Hydrogeology & Engineering Geology

基　　金：教育部高校博士点基金(20050532021);湖南省科技攻关项目(03GKY3129)

摘　　要：基于Hoek-Brown非线性经验强度准则和简化Bishop法,导出了节理破碎岩体边坡新的稳定性系数计算公式。通过在简单遗传算法(SGA)中引入适应度变换技术改进其收敛性能,提出了节理破碎岩体边坡稳定性分析和最危险滑动面搜索的自适应遗传算法(AGA)。算例计算结果表明:(1)AGA能准确地搜索到边坡全局最小稳定系数及其对应的临界滑动面;(2)AGA计算效率和数值稳定性均比SGA和随机投点法有较大提高;(3)采用不同的适应度变换函数均可提高计算效率。为简便起见,推荐采用线性变换函数。Based on the Hoek-Brown nonlinear strength criterion and simple Bishop＇s method, a new computation formula of stability safety factor for the broken jointed rock slope is presented. A fitness scaling technique is introduced into simple genetic alogrithm （SGA） to improve its convergence performance and an adaptive genetic algorithm （AGA） is proposed for the stability analysis and the most dangerous slip surface search of broken jointed rock slope. The stimulating calculation results show that： （1） AGA can exactly seek out the global minimal safety factor and the corresponding critical slip surface; （2） AGA has better calculation efficiency and numerical stability than SGA and random methods;（3） the different fitness scaling functions can effectively enhance the GA＇s calculation efficiency, and for simplicity, linear fitness scaling function is suggested.

关 键 词：边坡 节理破碎岩体 稳定性分析 Hoek—Brown准则 自适应遗传算法 

分 类 号：P642.22[天文地球—工程地质学] TU45[天文地球—地质矿产勘探]