MJS工法群桩施工对周边土体影响实测分析

FIELD MEASUREMENT AND ANALYSIS OF THE INFLUENCE ON THE SURROUNDING SOIL INDUCED BY MJS PILE GROUP CONSTRUCTION

结合苏州某基坑工程,现场实测并分析了坑内土体,全方位高压喷射工法(以下简称MJS工法)群桩加固施工引起的土体孔隙水压力、土压力、深层土体水平位移、分层沉降、地表沉降等的变化规律。结果表明MJS工法桩施工时,引起的超孔隙水压力和土压力增量总体较小且随与施工桩的距离增加而减小;MJS工法桩群桩实行跳打施工,可降低和防止施工对周边环境影响的群桩效应。

Combined with a foundation pit project in Suzhou,the changes of soil pore water pressure,earth pressure,horizontal displacement of deep soil,layered settlement,surface settlement,etc.caused by the all-round high-pressure injection method(hereinafter referred to as MJS method)in the pit were measured and analyzed on site.The results show that the increase in superpore water pressure and earth pressure caused by MJS pile construction is generally small and decreases with the increase of distance from the pile.MJS pile group construction method implements jump construction,which can reduce and prevent the pile group effect of construction on the surrounding environment.