Nonlinear Analysis On Vertical Bearing Capacity Of Cast-In-Situ Pile In Xigeda-Rock

Based on the sub-project'Testing Study on Bearing Properties of Pile Foundation in Xigeda-Rock' of the scientific research project in western transportation' Research on Highway Construction Techniques in Xigeda-Rock', and associated with the provincial scientific research project'Testing Study on Bearing Capacity of Bored Pile in Xigeda-Mudstone in Xichang-Panzhihua Expressway', this thesis makes a comprehensive research on the load transfer properties of the pile constructed in Xigeda-rock under vertical load. Mainly are as follows.1.According to the test pile load statistics in Puba area of Dechang county, this thesis analyses the distribution of the test pile's axial force,and load-displacement relations in Xigeda-rock under the vertical load.2.This thesis analyses the vertical load-transfer mechanism and the computing method of the piles under the vertical load, expresses the pile-soil interaction with the three-line load transfer function about the pile side and two-line transfer function about the pile tip. By using ANSYS software it has realized the coupling computing model about transfer function and matrix displacement.3.By using the coupling computing model about transfer function and matrix displacement it discusses the parameters on the sensitivity of P-S curve in coupling computing models, delivers the formula to adjust the parameters in the computing process. By comparing the computed and tested pile's P-S curves and column axial load curve in Puba site, it also shows the feasibility of the matrix displacement coupling computing method and the three-line vertical load transfer model.4.By further computing and analysis, it gets clear the method of getting the transfer founction parameters,the amending elementary principles and considerations of parameters in Xigeda-rock, proposes vertical load transfer function model and the parameter ranges,which is suitable to the cast-in-place pile built in the Xigeda-rock. It also cofirm vertical load transfer function model that is suitable to cast-in-place pile in Xigeda-rock.