After Grouting Technology To Improve The Test Of The Pile Bearing Capacity Of Large Diameter

Engineering character of the side and underlying soils decide the pile bearing capacity, the research shows , the pile bearing capacity can be unproved by improving and consolidating the side and underlying soils. So, this paper rely on Zhengzhou Huanghe River NO.2 bridge , through field bearing capacity test of six piles, analysis the piles' bearing capacity under no cement-inject ,side cement-inject, underlying Cement-inject and side and underlying both inject , the results show Latter Cement-inject technique can apparently improve bearing capacity of large diameter cast-in-place pile, so the pile length can be reduced by Latter Cement-inject technique and cut project cost .and in the test , self-balance loading method adopt integrated electro-mechanical design, all the date can be auto-collected, operate simply, and save cost, and application prospect widely.