沉桩挤土效应对临近基坑影响的试验研究

基于模型试验,采用3×3群桩和铝板模拟基坑围护结构的方式,研究了沉桩挤土效应对临近基坑的水平位移、坑底隆起和土压力的影响。试验结果表明,沉桩过程中,基坑受挤土效应的影响逐渐增大。就影响因素而言,基坑平面尺寸越大,其水平位移和坑底隆起变形越大,主动区土压力越小;基坑距桩区距离减小时,基坑水平位移、坑底隆起变形和土压力呈现增大的趋势。试验结果对临近基坑场地上沉桩施工具有重要的指导意义和实用价值。

Experimental Study on Effect of Pile Soil Compaction on Adjacent Foundation Pit

Based on the model experiment,3×3 group pile and aluminous sheet were used to simulate foundation pit support structure,so that the effect of the pile soil compaction on the horizontal displacement,bottom heave and earth pressure of the adjacent foundation pit was studied.The experiment results show that the pile soil compaction effect on pit is gradually increasing with the process of pile driving.As far as influencing factors are concerned,the larger the pit plane size,the greater the horizontal displacement and bottom heave,and the smaller the earth pressure in the active zone.The distance from foundation pit to the pile area is decreased;the horizontal displacement,bottom heave and the earth pressure show an increasing trend.The experiment results have important guiding significance and practical value to pile construction near the pit site.