Research on groundwater level variation and ground subsidence caused by foundation pit dewatering at the Wuhan first terrace
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摘要: 武汉一级阶地地层具有典型的二元结构特征，从浅层至深层土体渗透性逐渐增加，在基坑工程开挖降水过程中，随着疏干含水层水位的下降，各层土体水位变化特点各不相同，水位的变化影响着土体固结的压缩变形。采用现场群井抽水试验的方法，通过在抽水试验期间对不同深度含水层水位的观测及不同深度土体沉降的监测，结合各层土体性质及相关理论对武汉一级阶地基坑降水引起的土层水位变化及压缩变形规律进行研究。结果表明，武汉一级阶地基坑降水水位变化存在着明显的时空效应，沉降与水位变化密切相关，且沉降过程中土层中出现架空效应。Abstract: Layers in the Wuhan first terrace have the typical characteristics of the binary structural stratum, whose permeabilities increase gradually from the superficial layer to the deep layer. In the foundation pit dewatering engineering, with the fall of groundwater level in the objective aquifer, the laws of each groundwater level variation are different. What’s more, the variation in groundwater level affects the consolidation settlement of soil deformation. In this paper, the field group pumping test is used, and during the pumping test, groundwater levels at different depths of the aquifers are observed. In the same time, the ground subsidence at different depths is monitored. Combining with the properties of soil and the correlation theory, the groundwater level variation and ground subsidence caused by foundation pit dewatering at the Wuhan first terrace are examined. The results show that in the Wuhan first terrace, there is significant “time-space effect” on groundwater level variation, and ground subsidence is closely related to groundwater level variation, and there is “aerial effect” in ground subsidence.
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