Research on the Joint Slope Fuzzy Faliure Probability Based on General Hoek-Brown Criterion
详细信息
- 责任者：Wang Yu (Key Laboratory of Engineering Geomechanics ; Institute of Geology and Geophysics ; Chinese Academy of Science ; Beijing 100029 ; China) ; Li Xiao
- 刊名：Hydrogeology and Engineering Geology
- 出版年：2013
- 卷期：40(3)
- 关键词：节理岩体 ; jointed rock mass ; 边坡稳定性 ; slope stability
- 页码：p.41-47
- 图表：illus., 6 tables, 14 refs.
- 分类号：1702
- issnNo：ISSN1000-3665
- isbnNo：CN11-2202/P
摘要
The General Hoek-Brown(GH-B) strength criterion is used as a half experience criterion for confirmation of full rock or joint rock shear strength,which has become the most widely used criteria in the field of mass strength prediction and numerical calculation.Empirical formulas involve three material parameters,mb,s and a,which are relative to the characteristics of the rock mass.In practical application,they cannot be calculated directly,and they are only determined through the middle variable or with geological experience.In order to eliminate the H-B experience accumulative error during the middle variables derivation as much as possible and eliminate the deviation of the slope stability assessment results,a new method is put forward.We can examine the basic random variables,considering the fuzziness and the randomness of the basic variables.Through the fuzzy reliability theory,the slope failure probability and potential risk degree are analyzed and evaluated comprehensively.Starting from the four basic parameters GSI,σci,mi and D,which are middle variables to the GH-B experience formula,we use the fuzzy number to fuzzed the random variables,introduce them to the H-B experience formula,and use the modified fuzzy point estimation method to translate the slope limit equation.The translation takes the fuzzy set to ordinary random set.The fuzzy probability of the slope is solved.