Study On Design Method And Mechanism Of The Wall-pile-anchor Per-manent Retaining Structure For The Seismic Isolated Foundation Pit

Based on the construction of new Chengdu Museum,deformation properties and behavior mechanism of strengthened pile-anchor structure for permanent supporting foundation pit are ob-tained in this article using method of beam-structur FEM and equivalent-beam method. The research process covered foundation pit excavation, normal service condition, earthquake condition.In this article,the beam fern structural model and equivalent-beam model are established, and through de-signing optimization, technical parameters of pile-anchor structure are gotten.A FLAC3D model is built nextly.the above conditions are carefully verified again.At last,according to the monitoring data and calculation raeaults,it takes the result that the strengthened pile-anchor structure can assure the pit safety with meeting requirement of stability coefficient over2.0, anchor rod tension resistance coefficient over2.0, load coeffciency over1.25and the importance coefficient of safety engineering over1.1.