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受花岗岩残积土遇水软化崩解特性影响,滨海高水位区地铁异形深基坑施工一直是不可逾越的复杂工程。针对厦门地区花岗岩残积土开展了基本力学特性试验,并在此基础上,结合厦门地铁1号线吕厝站基坑工程,采用Flac3D软件建立该T型换乘站的三维地质模型,考虑基坑高水位条件下开挖时岩土地层的水-力耦合效应,对比分析土体不同开挖顺序对应工况下支护结构的力学性状,重点研究地连墙水平位移变化、钢支撑轴力及其周边土体的沉降规律,由此得到高水位条件下花岗岩残积土地层中地铁异形基坑最为合理的施工方法,为类似工程施工方案的优化提供一定的借鉴与参考。
Affected by the softening and disintegration characteristics of granite residual soil with water, the construction of special-shaped deep foundation pit with high water level in the coastal area has been an insurmountable complex project. Based on the basic mechanics characteristic test of granite residual soil in Xiamen area and on the basis of this, combined with the construction project of Lvcuo Station foundation pit in Line 1 of Xiamen Subway, the three-dimensional geological model of T-transfer station is established by Flac3D software, The water-force coupling effect of rock strata during excavation at high water level is analyzed. The mechanical properties of the supporting structure under different excavation sequence are compared and analyzed. The horizontal displacement of the wall, the axial force of steel support and The settlement rule of the surrounding soil, and thus the most reasonable construction method of the underground special-shaped foundation pit in granite residual soil stratum under the condition of high water level is obtained, which can provide some reference and reference for the optimization of similar construction plans.