Research Of Settlement Behavior Of Piled Groups Based On Static Load Test Of Single Pile

Presently during the design process of pile foundations in domestic and overseas, the static load test of single pile is generally performed, then the P-S curve is obtained. The curve is used to validate the design capacity of single pile, or used to perform the parameter of inversion calculation, but it is difficult to offer rational parameters for the analysis of pile group's settlement because of the complexity of pile-soil interaction. Although the P-S curve of single pile contains abundance information of pile-soil interaction, but it is not sufficiently used in settlement calculation of pile foundation. Thus it is enough space behind calculating the settlement of pile foundation from the P-S curve.This thesis is base on the P-S curve from the static load test of single pile and the interaction factors of pile to pile, pile to soil, soil to pile in pile groups, advances the method of calculating the average settlement of pile groups, and the simplified method of beam foundation supported by pile and pile raft foundation. The studies of the thesis consist of the following contents:1. Although there is little effect to limited capacity by circumstance of load test ,yet is not ignore effect to the P-S curve of single pile. So before using the curve, the thesis particular analyzes the influence factors of the P-S curve from three ordinary methods of pile load test, and amends the curve reasonable. Especially the thesis is aimed at the anchor-pile loading test, uses solve of Mindlin's problem and the method of interaction of pile to pile, amends the curve by the effect of anchor-pile's settlement.2. Advanced the reasonable method to analysis for vertical pile based on extended compatibility deformation. Considering there is dummy shear zone between pile-soil interface, based on displacement solution of Mindlin, and build up compatibility equation of pile-soil with extended compatibility deformation equation. There is shear stress and relative displacement relationship at the pile-soil interface, then equation is built up and solved by finite difference method. Relative displacement of pile-soil interface is simulated very well, and appropriate explanation of interaction of pile-soil is extracted.3. Analysis the interaction factors of pile to pile by finite element method, and build up simple formula of interaction factors of pile to pile. The paper analysis the mteraction factors of pile to pile by finite element method, which can take into account of the pile changing the character of soil, and compare the result with the Poulos's method. It is instructive to build up the mechanics model of the interaction factors of pile to pile. It is important to research of settlement behavior of piled groups based on curve of static load test of single pile.4. Since the elastic method cann't take into account of the pile changing the...