深基坑隆起稳定性的模糊可靠度参数分析

Fuzzy Reliability Analysis of Deep Foundation Pit Heave Stability

通过模糊概率与可靠度分析法相结合,引入深基坑抗隆起破坏分析的普朗特尔公式,建立了两随机变量的模糊可靠度简化模型,对隆起破坏进行了模糊可靠度评价,并对插入比、围护结构长度、地面超载、粘聚力、内摩擦角等参数进行了分析。通过实例,计算了深基坑隆起失稳的模糊破坏概率和模糊可靠度,验证了简化计算模型的实用性。结果表明,隆起破坏的失效概率与内摩擦角呈指数函数递减关系,模糊随机方法能够合理地反映基坑的实际稳定性。

By introducing Prandtl Formula for analyzing heave damage of deep foundation pit through combining fuzzy probability and reliability analysis,the simplified fuzzy reliability model of two random variables has been established to evaluate fuzzy reliability of heave damage and analyze insertion ratio,enclosure structure length,ground overload,cohesion,inner friction angle etc..Through examples,the fuzzy failure probability and fuzzy reliability of deep foundation pit heave are calculated,which verified the practicability of simplified model.The results show that the probability of heave damage is decreasing with inner friction angle by exponential function.Therefore,fuzzy random method can reasonably reflect the actual stability of foundation pit.