顶管桩施工对桩周土体扰动的现场试验研究

Field Experimental Research on the Disturbance of Pipe Jacking Pile Construction to the Surrounding Soil

作为一种将钻孔灌注桩和压力平衡式顶管技术结合的新型成桩方法,顶管桩可解决存在既有建筑时围护结构打设和穿高水头承压水层成桩困难等问题。通过低净空环境下顶管桩施工现场试验,对桩周土体扰动进行研究,总结地表沉降、桩周土体水平位移、桩周土体竖向位移和深层土体扰动分布及变化规律。

As a new pile-forming method combining the bored pile and the pressure-balanced pipe jacking technology,the pipe jacking piles can solve the problems of the installation of the retaining structure in the existing building and the difficulty of forming the pile in the high water head pressurized water layer.In this paper,the field test of the pipe jacking piles construction under low clearance environment is carried out,and the soil disturbance around the pile is studied.The surface settlement,horizontal displacement of soil,vertical displacement of soil and disturbance distribution and variation of deep soil are summarized.