【摘要】 对土体抗剪强度指标因水土作用产生的影响进行了研究,指出变异后的土体抗剪强度c、φ值具有概率分布和隶属函数的不确知性,并简要探讨了获取水土作用下土体抗剪强度指标的试验模拟和经验公式推导两种办法。以悬臂式基坑支护结构的两种控制性失稳模式为例,分析水土作用对失稳极限状态函数的影响。针对水土作用下的抗剪强度指标概率分布和隶属函数的不确知性,基于非概率可靠度理论,探讨了适合水土作用状况下基于区间分析的基坑支护结构非概率可靠度模型,这种模型能分析基坑支护结构的稳定性,该方法计算简便易行,并能合理地考虑基坑工程的不确定因素。更多还原

【Abstract】 The shortage of the probability of reliability analysis to braced structures of excavation without considering water-soil interaction is pointed out,and the preconditions to considering water-soil interaction are given in this paper.After researching the influence of water-soil interaction on intensity of soil,it is suggested that the distribution parameters and fuzzy number of values of changed c and φ cannot be recognized.Two methods based on experimental process simulation and empirical formula deduction used to obtain the values of changed c and φ are briefly discussed.By taking cantilever braced structures as an example,the influence of water-soil interaction on two dominating failure margin functions is analyzed.A non-probabilistic model based on interval analysis is proposed in order to solve the uncertainty of distribution parameters and fuzzy number of values of excavation braced structures.更多还原