【作者】 张永杰； 曹文贵； 赵明华； 赵衡；

【Author】 ZHANG Yong-Jie CAO Wen-gui ZHAO Ming-hua ZHAO Heng (Institute of Geotechnical Engineering,Hunan Univ,Changsha,Hunan 410082,China)

【机构】 湖南大学岩土工程研究所；

【摘要】 根据公路下伏岩溶顶板稳定性影响因素的随机性、模糊性以及岩土力学参数取值的区间性特征,提出采用非对称三角模糊数表示参数取值可能性分布,在此基础上建立岩溶顶板模糊极限平衡分析模型.根据计算参数取值特点,综合运用模糊数学理论、岩体质量分类指标GSI以及Hoek-Brown强度准则建立参数三角模糊数确定方法.在深入研究岩溶顶板稳定可靠性分析之合理功能函数基础上,利用模糊能度可靠性分析方法,建立了更能反映工程实际的公路下伏岩溶顶板模糊能度可靠性分析方法.工程实例分析表明,该方法具有一定的合理性,其为岩溶顶板稳定性评价提供了一种新的不确定性分析方法.更多还原

【Abstract】 Effecting factors of karst roof stability have randomness and fuzziness,and geomaterials mechan- ics parameter values have the interval feature.So asymmetry triangular fuzzy numbers were used to express the probable distributions of parameter values.The fuzzy limit balance analysis model of karst roof was presented based on these asymmetry triangular fuzzy numbers.Secondly,according to the characteristics of calculating pa- rameters,the determination method of triangular fuzzy numbers was proposed by comprehensive application of fuzzy mathematics theory,rock classification index GSI and Hock-Brown strength criterion.Finally,the rea- sonable performance function to evaluating the reliability of karst roof was suggested.And the fuzzy possibilistic reliability analysis method was used to analysis the reliability of karst roof underlying highway,which can reflect the engineering practical much more.Engineering example result indicates the feasibility of the method suggest- ed,and it provides a new uncertain analysis method for karst roof stability evaluation.更多还原