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北京地铁14号线蒲黄榆站为3层暗挖车站,设置了由2—1号横通道及8个小导洞,形成了立体交叉洞室群工程。车站工程区地质条件复杂,采用暗挖法施工难度大。为研究此立体交叉洞室群工程施工方案的合理性,采用FLAC3D计算软件对此立体交叉洞室群工程施工力学行为进行了三维数值模拟分析。分析了立体交叉洞室群工程开挖引起的洞室支护结构的应力分布、导洞变形、地层塑性区的分布特征及典型管线正上方地表沉降变形,并将地表沉降现场监控量测数据与计算结果进行了对比分析,结果表明该施工方法可以保证工程施工安全。
Puhuangyu Metro Station on the 14th line of the Beijing Subway is a 3-storey underground station with a horizontal crossing of No. 2-1 and 8 small pilot tunnels, forming a three-dimensional cross-over cavern project. The geological conditions in the station engineering area are complex and the construction by using the undercut method is difficult. In order to study the rationality of the construction scheme of the three-dimensional cross-over caverns, three-dimensional numerical simulation of the construction mechanics behavior of the three-dimensional cross-over caverns was carried out by FLAC3D software. The stress distribution, the deformation of the guide tunnel, the distribution of the plastic zone in the cavern and the deformation and settlement of the surface caused by excavation of the cross-over caverns are analyzed. The measured data of surface subsidence monitoring The results of calculation are compared and the results show that the construction method can ensure the construction safety.