桩端下伏溶洞顶板稳定非概率可靠性分析方法  

Non-probabilistic Reliability Analysis Method of Karst Roof Stability under Pile Tip

作　　者：龚先兵[1,2] 赵明华[1] 张永杰[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082 [2]湖南省高速公路管理局,湖南长沙410001

出　　处：《湖南大学学报（自然科学版）》2011年第1期13-17,共5页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50878083)

摘　　要：针对桩端下伏溶洞顶板稳定性分析中所具有的不确定性,采用区间数表示计算参数不确定性取值,并综合运用区间数学理论、岩体质量分类指标RMR以及Hoek-Brown经验强度准则建立参数区间数确定方法.在现有研究基础上建立同时考虑抗冲切、抗剪与抗弯作用的桩端下伏溶洞顶板极限平衡分析模型.在探讨功能函数的合理确定方法基础上,采用非概率可靠性理论建立桩端下伏溶洞顶板稳定非概率可靠性分析方法.通过工程实例分析表明了该方法的合理性与可行性,其为桩端下伏溶洞顶板稳定性分析与评价提供了一种新的不确定性分析方法.There is uncertainty in the analysis of the stability of karst roof under pile tip. The interval numbers were used to express the calculation parameters. And the method to determine the interval numbers was proposed by the comprehensive application of interval mathematical theory, rock mass rating index （RMR） and I-toek-Brown em- pirical strength criterion. Secondly, the limit equilibrium analysis model of karst roof under pile tip was presented on the basis of the present study. The model can consider the action of punching shear, shearing and bending at the same time. Thirdly, the performance function was proposed to evaluate the reliability of the stability of karst roof under pile tip. The non-probabilistic reliability analysis method for stability of karst roof under pile tip was finally founded. This method is proved to be rational and feasible with engineering case analysis, and it provides a new uncertain analysis method for the stability evaluation of karst roof under pile tip.

关 键 词：岩土工程 岩溶 基桩 区间数 非概率可靠性 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]