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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。
Based on the model test, 3 × 3 pile and aluminum plate are used to simulate the retaining structure of foundation pit, and the effect of pile squeezing effect on the horizontal displacement, pit uplift and earth pressure near the foundation pit is studied. The test results show that the influence of the excavation by the squeezed soil effect gradually increases during pile driving. In terms of influencing factors, the larger the plane size of the foundation pit, the greater the horizontal displacement and the deformation at the bottom of the pit, and the smaller the earth pressure in the active region. When the distance between the foundation pit and the pile region decreases, the horizontal displacement of the foundation pit, Earth pressure shows an increasing trend. The test results have important guiding significance and practical value for the construction of pile sinking near the foundation pit.