Analysis Of Stress Deformation Of Pile Anchor Supporting Applied In China Satellite Building Foundation Pit Engineering

Through analysing and processing the engineering construction and test data, includinggeological data, expanded head bolt basic pull-out test data, anchor shaft force test data,correlation displacement data and excavation or support progress of china satellitecommunications building foundation pit engineering, at the same time, by numerical simulationmethod, the stress and deformation characteristics of pile anchor supporting structure applied indeep foundation pit were studied. Research has made the following main results and conclusion:(1) Based on half share allocation method, the actual detected anchor shaft force value isreversely calculated into soil pressure value, to discuss the related distribution parameter m ofthe medium hardness clay soil pressure distribution of Terzaghi and Peck. The biger M value is,the smaller soil pressure value is, and then the design calculation is more dangerous. Usually m=1, if the geotechnical parameters is correct, the project get m=3.5, the structure is still safe andreliable.(2) Researching the interaction mechanism expanded head bolt and the soil, the calculationmodel of it is amended,and the key of calculation locates on experimental measurable soilpoisson’s ratio.Through the analysis of the pull-out basic test, expanded head bolt has goodengineering performance from the curve development.(3) The horizontal displacement of pile body and the pile top is closely related withexcavation or support condition, the pile body displacement shows two different convergencesituation.(4) Through numerical simulation analysis of the south wall of foundation pit, internalforce diagram of pile anchor structure changes with the length and angle of anchor. And the pileanchor structure internal force and soil displacement change with excavation or supportsituation. From the cloud picture and the curve extracted from corresponding node value, thedevelopment situation of numerical simulation and actual situation are basicly consistent.