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基于群桩模型试验,分别对单桩和群桩沉桩时引起的超孔隙水压力的变化情况进行量测,并对超孔压的分布、消散和施工顺序的影响给予分析。试验结果表明:随着沉入土体内桩数的增加,超孔隙水压力不断积累,但累积到一定程度后增幅变缓。沉桩顺序对超孔隙水压力有影响。在水平方向,随着测点至桩轴距离的加大而呈非线性减小,超孔压的影响范围约在5倍桩径内;在桩群范围内,超孔隙水压力沿深度是不断增加的,且外侧增加幅度大于桩群区域。超孔压的消散与土体的渗透性有关,消散要经过一个缓慢的过程,群桩施工时要注意采取能使孔隙水快速排出的措施,以减小沉桩挤土效应。
Based on the group pile model test, the variation of excess pore water pressure caused by single pile and group pile driving pile driving are measured respectively. The influence of the distribution, dissipation and construction sequence of excess pore pressure is analyzed. The test results show that the excess pore water pressure accumulates with the increase of the number of piles embedded in the soil, but the accumulation increases to a certain extent and then slows down. Piling sequence has an impact on the excess pore water pressure. In the horizontal direction, with the distance from the measuring point to the pile shaft nonlinear decrease, the influence range of the excess pore pressure is about 5 times the diameter of the pile. Within the scope of the pile group, the excess pore water pressure is constant along the depth Increased, and lateral increase greater than the pile group area. The dissipation of excess pore pressure is related to the permeability of the soil. The dissipation process goes through a slow process. When group pile construction, pay attention to the measures that can quickly remove the pore water so as to reduce the pile squeezing effect.