考虑土体材料二维空间变异特性的边坡可靠度分析  

Reliability analysis of slope stability considering two-dimensional spatial variability of soil

作　　者：褚雪松[1] 李亮[1] 吕惠[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《水利水电科技进展》2015年第2期32-36,66,共6页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51274126;51008167);大连理工大学海岸与近海工程国家重点实验室开放基金(LP1214)

摘　　要：为了更合理地分析边坡的可靠性,提出了考虑土体二维空间变异特性的边坡可靠度分析方法,将边坡区域离散为系列单元,假设单元内土体材料参数完全相关,通过假定的自相关函数确定单元之间土体材料参数的相关系数,采用子集模拟法抽样,运用和声搜索算法搜索最小的安全系数作为该次抽样的结果。将提出的可靠度分析方法应用于两个边坡实例的可靠度分析中,并与已有结果进行对比分析,结果表明,考虑土体材料参数的空间变异特性后,边坡的破坏概率降低,边坡可能的破坏区域逐渐增多。A method for slope system reliability analysis considering spatial variability of soil is developed to rationally evaluate the reliability of slope stability. The basic idea is that the slope domain is discretized into a series of＂elements＂,within each of which the soil property is fully correlated. The correlation coefficient among soil properties from different elements is obtained assuming autocorrelation function. Sets of random samples are generated by subset simulation,and harmony search algorithm is adopted to search the minimum factor of safety as the corresponding output. The method is applied to two examples to analyze the reliability and then compare it with existing results. Overall,the results show that the failure probability is lower than the case without considering the spatial variability and the potential failure modes are greater than that without taking into account the spatial variability.

关 键 词：边坡稳定 空间变异特性 可靠度分析 子集模拟方法 极限平衡法 破坏概率 

分 类 号：TU43[建筑科学—岩土工程]