Abstract
For a project in Nanjing Jiangbei New Area, after excavation of foundation pit and foundation plate pouring, water inrush between side wall of foundation plate and wall occurred in foundation pit. At this time, the water level of confined water observation wells in 2-4 and 2-5 silty fine sand layers in foundation pit can meet the requirements of safe water level control. According to the analysis, the inrush water is inrush water from 3-4e and 3-4 coarse sand layers in deep layer. It is difficult to treat the floor slab in the pit due to the completion of construction. In order to solve the problem of water inrush in the pit, the measures of precipitation outside the pit are adopted, but precipitation causes rapid settlement of the ground in adjacent areas. In order to reduce the ground settlement, a recharge well is specially designed, the recharge test is organized, the structure of the recharge well is optimized, and the spacing between the two layers is arranged according to the test results. The problem of recirculation between pumping and recharging outside the pit is solved. Finally, settlement was successfully controlled. Without water-stop curtain, the project carries out precipitation and recharge outside the pit at the same time, which not only solves the inrush water, but also controls the settlement. In addition, the foundation pit is deep and inrush water is large. During the process, the analysis is carried out first, and then the test is carried out, so that the purpose of recharge can be achieved. It has reference value, so it is concluded in writing.
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