Fuzzy Reliability Analysis of Resistant Heave Stability for Deep Foundation Pit Based on Deformation

It is difficult to study the resistant heave stability of deep foundation pit in the geotechnical engineering field.Fuzziness and randomness are two main influence factors in the study of stability of deep foundation pit against basal heave failure,so it is necessary to develop fuzzy reliability approach in stability analysis of deep foundation pit for geotechnical engineering.Considering the randomness of physical and mechanical parameters and the fuzziness on the failure criterion,the two-aespect researches are developed to study stability analysis of deep foundation pit for the Subway of the Mid Ring of Xian-xia Road in Shanghai as follows:(1) based on ABAQUS,the contract model between deep foundation pit structure and earth mass is studied,and the non-linear finite element model,which analyzes the stability of resistant heave for deep foundation pit based on deformation,is established;(2) based on deformation,the [δ]-δ ultimate limit state model is built up to reflect the failure process of deep foundation pit.In the course of analysis,the fuzzy mathematics and reliability analysis method is used to set up fuzzy reliability finite element method to analyze the resistant heave stability of deep foundation pit.The study shows that ABAQUS has powerful capacity to analyze the contract problems in geotechnical engineering,the resistant heave failure ultimate limit state model based on deformation of deep foundation pit can effectively analyze stability of deep foundation pit,and the study can provide valuable reference for the stability analysis of foundation pit.