| As the national economy increases, the project of construction makes rapid progress. In order to meet the demand of groundsill intension, deformation and anti-seismic, the crude soft soil must be dealt with artificially.Nowadays,Composite foundation is one of the most widely used soil improvement technologies. With higher and higher demand to soil improvement,composite foundation technology is developing continuously.Plain concrete pile composite foundation has been developed recently because of its high bearing capacity,little settlement,wide adaptation,good economical and social benefit.This dissertation has summarized the application,development and research of composite foundation and introduced the basic concept and the mechanism.At the same time,there are some analyses and discussions about the test research,finite element analysis and theory analysis.(1) Simply introduces the background of composite foundation and the definition, classification, mechanism and application and development situation.(2) Based on the field tests of the plain concrete pile composite ground of Long Hu century.the paper introduces the condition of the field test in detail and lists the main test results first.Then the test results of the pile-soil stress, stress of the pile and soil are analyzed. Conclusions:with the increase of the upper structure load pile top pile soil pressure and pressure are gradually increasing, pile-soil stress than also increase gradually, and approximate linear rule. Along the axial force pile of pile body first.(3) The finite element software of ANSYS is used to simulate the plain concrete pile composite foundation.By contractting with the measured data,correctness and rationality are proved.Based on this, comparative analysis of various factors affectting the reciprocity of the pile and soil is made.,such as load, cushion thickness, cushion modulus; pile length and the pile spacing,and the law of reciprocity of the pile and soil are obtained.
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