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随着沿海地区大规模的地下基础设施的建设,越来越多的地下连续墙和桩基础等地下结构物被建造在深层的土体中。由于这些地下构筑物的存在,对地下水渗流产生阻挡作用,原有的地下水渗流场受到影响。本文通过室内试验研究,观察对比了有构筑物阻挡和没有构筑物两种情况下地下水渗流情况的变化。研究表明地下构筑物的存在改变了水位的分布状况,并延长了地下水位稳定的时间。构筑物埋深与水力梯度变化之间的关系可采用指数曲线进行拟合,随着构筑物埋深的增加,上下游水力梯度初期增加缓慢,后期呈现快速增长。如果构筑物插入土中的深度与土层厚度之比能控制在70%以内,则地下构筑物挡水作用的影响程度可以控制较小的范围。
With the construction of large-scale underground infrastructures in coastal areas, more and more subsurface structures such as diaphragm walls and pile foundations are built in deep soil. Due to the presence of these underground structures, the groundwater seepage will be blocked, and the original groundwater seepage field will be affected. In this paper, through laboratory experiments, we observed the changes of groundwater seepage under the condition of block and no structure. Studies have shown that the presence of underground structures changes the distribution of water levels and prolongs the stabilization of groundwater levels. The relationship between the depth of the structure and the hydraulic gradient can be fitted by exponential curve. As the depth of the structure increases, the hydraulic gradient at the upstream and downstream increases slowly at the initial stage and increases rapidly at the later stage. If the ratio of the depth of the structure inserted into the soil to the thickness of the soil layer can be controlled within 70%, the influence of the retaining function of the underground structure can be controlled to a lesser extent.