为确保地铁施工期间邻近建筑物的安全使用,在综合考虑邻近建筑物使用现状、相应规范和受力特点的基础上,运用位移反分析和有限元方法对其进行结构安全分析,并据此确定邻近建筑物变形控制指标.在某地铁车站附属结构施工前,应用该方法对2栋邻近砌体结构建筑物的安全性分析表明:当差异沉降小于10mm时,建筑物上部结构和基础底板能够满足正常使用的要求,根据两栋建筑物分别已有6.59和7.01 mm的差异沉降现状,给出2栋建筑物沿既有最大倾斜方向的允许新增差异沉降控制值分别为3和2mm.依此标准,建筑物在附属结构施工结束后结构完好,验证了该工前安全性分析方法的合理性.%In order to ensure the safe use of the adjacent buildings during subway construction, based on comprehensively considering the current status of building application, the corresponding norms of the building and structural characteristics, structure safety analysis was made on the adjacent buildings by displacement back analysis and finite element method, and accordingly the deformation control indexes for adjacent buildings were determined. The building safety analysis of the two adjacent masonry buildings before the construction of the subway station accessory structures was carried through. Analyses show that, the upper structure and foundation slab can meet the requirements for normal use when differential settlement is less than 10 mm. Based on the current status that two buildings already have 6. 59 and 7. 01 mm differential settlement respectively, the control values for the allowable newly increased differential settlement are respectively given as 3 and 2 mm along the largest existing dip directions. According to this standard, the building structures are safe and in good condition after the construction of the accessory structures, which has validated the rationality of the pre-construction safety analysis method.
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