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为了深入研究有孔管桩群桩沉桩引起的超孔隙水压力变化规律,基于室内模型试验,对无孔管桩群桩和3种布孔方式的有孔管桩群桩沉桩时引起的超孔隙水压力进行了监测,分析了沉桩顺序、布孔方式等因素对超孔隙水压力时空消散的影响,获得了无孔管桩群桩和3种布孔方式的有孔管桩群桩沉桩时超孔隙水压力随时间、深度、径向距离和沉桩顺序的变化规律。通过对比分析可知,有孔管桩群桩沉桩产生的超孔隙水压力小于无孔管桩群桩,表明有孔管桩群桩在一定程度上能降低超孔隙水压力,其中星状布孔方式的有孔管桩群桩沉桩产生的超孔隙水压力峰值最小,消散速率最快,最有利于减小沉桩挤土效应,沉桩效应最佳。
In order to deeply study the variation rule of excess pore water pressure caused by pile driving with perforated pipe pile group, based on the indoor model test, it is found that when there are three kinds of perforated pipe pile groups The effect of excessively pore water pressure on the spatial and temporal dissipation of excess pore water pressure was analyzed. The effects of pore pile grouping and three kinds of perforated pipe pile groups were obtained Variation of excess pore water pressure with time, depth, radial distance and pile driving sequence during pile driving. Through comparative analysis, it can be seen that the excess pore water pressure produced by the pile with perforated pipe pile group is less than that of the non-perforated pipe pile group pile, which indicates that the pile group with perforated pipe pile can reduce excess pore water pressure to a certain extent, The method of pile perforated pile with perforated pipe group produced the smallest pore water pressure peak, the fastest dissipation rate, the most conducive to reducing pile squeeze soil effect, the best pile effect.