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地下连续墙和水泥搅拌防越流墙的共同作用,可以防止多层含水层越流补给,从而起到保护周边环境和降低沉降的作用。以天津某地铁车站基坑开挖工程为例,通过数值模拟计算和实际工程应用,分析了不同埋置深度的水泥搅拌防越流墙在越流含水层基坑降水过程中对基坑周边含水层水位变化和地面沉降变化的影响,得出以下结论:(1)地基土存在越流含水层时,水泥搅拌防越流墙在基坑工程降水过程中能够有效降低基坑周边含水层水位的变化和基坑周边地面沉降的变化;(2)随着围护结构埋置深度的增加,基坑周边含水层水位变化最大值和地面沉降最大值均减小,通过数值模拟可以计算具体工程围护结构的最优埋置深度;(3)随着围护结构埋置深度的增大,基坑周边地面沉降影响半径逐渐减小;(4)在基坑降水施工过程中,水泥搅拌防越流墙能够有效减小基坑降水对地表沉降以及对周边含水层的影响。
The joint action of the diaphragm wall and the cement mixing anti-slippery wall can prevent the multi-layer aquifer from flowing backward to protect the surrounding environment and reduce the settlement. Taking the foundation pit excavation project of a metro station in Tianjin as an example, numerical simulation and practical engineering application were used to analyze the effect of cement mixing overpass walls with different embedment depths on the water content around the foundation pit The following conclusions can be drawn: (1) When the overflowing aquifer exists in the foundation soil, the cement mixing anti-slip wall can effectively reduce the water level around the foundation pit during the process of foundation pit dewatering (2) With the increase of embedment depth of embankment, the maximum change of aquifer water level and the maximum of land subsidence around foundation pit both decrease. By numerical simulation, (3) As the embedment depth increases, the influence radius of ground subsidence around foundation pit gradually decreases; (4) In the process of foundation pit dewatering, cement mixing is prevented Flow-wall can effectively reduce the impact of foundation pit dewatering on surface subsidence and surrounding aquifers.