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针对北京地铁九号线区间隧道下穿既有建筑物的典型实例,在对建筑物现状及变形分析的基础上,采用数值模拟分析计算了三种不同施工方案下对建筑物地基基础及邻近地面的沉降规律,并通过对现场施工方案与监测数据进行对比分析,得出了一些规律:在计算方案中,采用隔离桩能对控制地基基础变形起到关键作用;隧道下穿的建筑物地基基础类型对变形特征有较明显的影响;对于砂卵石地层中地铁隧道下穿建筑地基基础,采用CD法施工并结合全断面外轮廓注浆等辅助措施是安全可靠的。
Aiming at the typical example of underpass existing buildings in the tunnel of Beijing Metro Line 9, based on the status quo and deformation analysis of the buildings, numerical simulation analysis was used to calculate the influence of three different construction schemes on the foundation of the building and the adjacent ground And through the comparison of the on-site construction plan and monitoring data, some rules are obtained: In the calculation scheme, the isolation pile can play a key role in controlling the deformation of the foundation; the foundation of the foundation under the tunnel The type has obvious influence on the deformation characteristics. For subway foundation under sand-pebble stratum, it is safe and reliable to construct by CD method and grouting together with full-profile outer contour.