中文摘要：

文章采用室内缩尺模型试验对基坑开挖下土压力分布、变形机制进行了分析，并研究了水体对基坑开挖效应的影响。结果表明：随着开挖深度的加大，基坑周围的应力值在减小，且与开挖深度处于同一深度的土体的应力变化幅度最大，尤其在邻水状态下，应力变化幅值曲线会有明显的拐点；基坑侧向位移逐渐增大，但增幅逐渐减小，非邻水状态下位移曲线走势平滑稳定，邻水状态下位移在开挖深度达到一定值时会有减小趋势。试验研究成果对基坑开挖效应的分析，特别是邻水基坑的研究具有一定的参考价值。

英文摘要：

The distribution of soil pressure and deformation mechanism under the condition of founda-tion pit excavation were studied by using the laboratory scale model test ,and the excavation effect of foundation pit affected by water nearby was also presented .The results show that the stress around the foundation pit decreases when the excavation depth increases .The measured soil pressure is grea-test when the soil depth is same to the excavation depth .The variation curves of stress amplitude have obvious inflection points when the excavation is approaching the river .Meantime ,the increment of lateral displacement deformation of foundation pit is tending to be great .The curves of displacement not close to the river will be steady and smooth ,however ,the curves will abruptly decrease when the pit is excavated to a certain depth close to river .The experimental results are valuable for the analysis of foundation pit excavation ,especially for the research on foundation pit close to river .