PHC管桩在高速公路桥梁工程施工中引起的超孔隙水压力分析

根据某高速公路桥梁工程PHC管桩施工过程中的实测结果,利用各测点产生的超孔压消散曲线,结合孔压计埋设图,分析了超孔隙水压力的大小、分布、变化规律及影响范围,得出以下结论:1)随着入土深度的增大,孔隙水压力均有开始减小然后增大的过程;2)测点距离沉桩越近,孔隙水压力影响越大,且孔隙水压力数值变化越明显;3)位于深层的超孔隙水压力随着有效半径的减小明显增大。提出了减弱超孔隙水压力的措施。

Analysis on excess pore water pressure caused by installing PHC in expressway bridge

According to the results measured during construction of PHC pile in an expressway bridge engineering,the magnitude,distribution,the changing regularity and effect range of the excess pore water pressure are discussed.Some conclusions are got: with the depth increasing,pore water pressure reduces at first,and then increases;with the effective radius getting smaller,pore water pressure affects greater,and the change of the pore water pressure is more obvious;the pore water pressure in deeper layer increases more obviously with the reduction of the effective radius.Some measures are put forward in order to eliminate the effect of pore water pressure.