基于Hoek-Brown准则的三维边坡变形稳定性分析  

Deformation stability of three-dimensional slope based on Hoek-Brown criterion

作　　者：林杭[1] 曹平[1] 李江腾[1] 江学良[1] 何忠明[1] 

机构地区：[1]中南大学资源与安全工程学院,长沙410083

出　　处：《岩土力学》2010年第11期3656-3660,共5页Rock and Soil Mechanics

基　　金：高等学校博士学科点专项科研基金(No20060533071);中国博士后科学基金资助项目(No20060400264);中南大学博士后科学基金资助项目

摘　　要：采用Hoek-Brown准则,分析三维边坡在开挖扰动下的变形稳定性。以某露天矿边坡为工程背景,利用快速拉格朗日差分法(FLAC3D)建立三维数值分析模型,并在边坡中布置若干监测点,利用FISH语言编制相应位移插值程序,探讨边坡开挖引起的动静态位移响应,从宏观角度揭示出边坡开挖后,不同区域的变形,为工程实践提供指导;介绍了强度折减技术在Hoek-Brown准则中的实施方法,采用计算不收敛失稳判据,计算边坡安全系数,从而进一步推广Hoek-Brown强度折减法在三维边坡稳定性分析中的应用。The deformation stability of three-dimensional slope is analyzed based on Hoek-Brown criterion.Rock slope at a surface mine is chosen as the analysis object.Three-dimensional numerical analysis model is established by fast Lagrangian explicit-finite-difference code of continua（FLAC3D）;and some monitoring points are located in the slope.In order to obtain the accurate values of displacements for these monitoring points,an internal routine（FISH） is developed to calculate the interpolation displacements.The static and dynamic displacements after slope excavation are analyzed,which reveals the slope macroscopic deformations in different zones and gives guidance for engineering practices.Finally,the strength reduction method in the Hoek-Brown criterion is applied to calculating the safety factor of slope after excavation.In the analysis,the non-convergence of calculation is chosen to describe the failure of slope.The calculation further extents the application of strength reduction method of Hoek-Brown criterion in three-dimensional slope stability analysis.

关 键 词：边坡稳定性 三维数值模拟 强度折减法 HOEK-BROWN准则 

分 类 号：TU457[建筑科学—岩土工程]