基于Hoek-Brown准则点安全系数的边坡稳定性分析  

Stability of point safety factor of slope based on Hoek-Brown criterion

作　　者：蒋青青[1] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2009年第3期786-790,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金重大资助项目(50490270)

摘　　要：为了采用Hoek-Brown准则分析边坡各部位的稳定程度,通过理论分析,推导Hoek-Brown参数表征的点安全系数(Fp)函数;利用FLAC3D软件建立边坡数值计算模型,编制相应Hoek-Brown点安全系数程序,分析材料参数和应力变化的影响。研究结果表明:采用自编程序计算的Fp≤1区域与采用FLAC3D软件计算的塑性区分布范围大致相同,并且点安全系数的判定标准能够表征各单元的破坏程度,优于塑性区判定标准;随着单元损伤程度的加大,点安全系数Fp逐渐减小;随着地质强度指标GSI增大,Fp逐渐增大,两者之间的关系符合3次多项式分布;Fp随完整岩石的单轴压缩强度σci的增大而增大;最大主应力σ1增大引起Fp逐渐减小,两者表现出显著的双曲线分布规律;Fp随最小主应力σ3的增大而增大,这与工程实际情况相符。In order to analyze the stability of each part in slope based on Hoek-Brown criterion, the point safety factor Fp described by Hoek-Brown criterion parameters was proposed, the three dimensional calculation model for slope was calculated by FLAC3D software, the program of Fp for Hoek-Brown criterion was compiled, and the effects of material parameters and stress variation to Fp were analyzed. The results show that, areas calculated by the self-compiled program when Fp≤1 are similar to the plastic areas calculated by FLAC3D software, which validates the correction of the self-compile program, and Fp can reflect the failure degree of each element which is superior to the plastic zone distribution standard. With the increase of damage in slope element, the point safety factor Fp decreases gradually. Fp increases with the increase of geology strength index GsI, the relationship between Fp and GSI can be well described by cubic-polynomial equation, and Fp increases with the increase of uniaxial strength of intact rock σci. Relationship between σ1 and Fp meets the hyperbola principle, while Fp increases with the increase of σ3, which is in accordance with the real situation.

关 键 词：边坡 HOEK-BROWN准则 点安全系数 数值分析 

分 类 号：TU457[建筑科学—岩土工程]