Research On Seism-bearing Properties Of Pile-anchor Supporing Structure For Deep Foundation Pit

Pile-Anchor Supporting Structure for deep foundation pit is widely used because of itscharacteristics such a low cost, space saving, bering depth and adjustment to variable topsoil,butthe study on anti-seismic property and corresponding specifications have not been done. Thissituation is unable to adapt the development of pile-anchor supporting structure for deepfoundation pit. For China, the mainland locates at the edge of the two most active seismic zone–Pacific and Eurasian zone, which leading intense and frequent seismic activity. In this paper, theseism-bearing properties of Pile-Anchor Supporting Structure for deep foundation pit mainlyanalyzed. Based on finite element numerical simulation, soil mechanics is analyzed the characterduring excavation and the deformation of Pile-anchor Supporting Structure. Besides, withapplying seismic performance, the study on its dynamic and anti-seismic characteristics isdetailed.Work and the results obtained in this paper:(1) Soil is a material relating to stress path. Its deformation characteristics under excavationis different from general pressurization. During simulating the pit excavation, we must considerreasonable soil models and precise parameters to simulate a more correspondent situation.(2) By using the PLAXIS2-dimension Hardening-soil small model, compared the axialforce, bending moment, shearing force on the pile. Discussed the difference of pit-wallhorizontal displacement, pit-back surface subsidence and axial-forced displacement and internalforce on the anchor bolt. Which show the deformation character and laws of pile-anchorsupporting structure for deep foundation pit.(3) Acceleration response, Stress distribution, internal character of pile and spectrum effectunder horizontal seismic performance are discussed; evaluated the anti-seismic property ofpile-anchor supporting structure.