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青秀山站是南宁轨道交通3号线从北到南的第17个站,由于地面地势起伏较大,青秀山站隧道埋深较大,达47米。因此,青秀山站采用站厅明挖、站台暗挖的分离式岛式站台,明挖站厅通过从底板斜向下的扶梯斜通道与站台层横通道中部相通,扶梯斜通道夹在平行站台层隧道中间。站台层的这种复杂隧道群暗挖施工的工程案例非常罕见,隧道群相贯岔口处的施工是整个工程中最为关键和危险的环节。为了研究复杂隧道群岔口施工的安全性及对隧道结构的影响,通过有限元分析软件Abaqus对隧道群的施工进行数值模拟。结果表明:对比无岔口影响的标准断面,岔口处施工的不利影响非常明显;不同的岔口施工方式的影响效应也有明显不同。施工中针对不同的岔口施工方式采取相应的加强支护措施是十分必要的。
Qingxiunshan Station is Nanning Metro Line 3 from north to south of the first 17 stations, due to the larger terrain ups and downs, Qingxiunshan tunnel depth greater, up to 47 meters. Therefore, the Qingxiunshan station using open excavation stations, site excavation separate island-style platform, Ming dug station hall through the ramp from the bottom obliquely connected to the ramp with the platform horizontal cross-channel middle, ramp entrainment ramp in the parallel platform Middle of the tunnel The engineering cases of this kind of complicated tunnel group excavation at the platform level are very rare. Construction at the intersection of the tunnel group is the most critical and dangerous part of the whole project. In order to study the safety of construction of complex tunnel junction and its influence on tunnel structure, the construction of tunnel group is simulated by finite element analysis software Abaqus. The results show that compared with the standard section without the influence of the fork, the unfavorable influence of the construction at the fork is obvious. The influence of different fork ways is obviously different. Construction for different construction methods to take the appropriate fork to strengthen support measures is necessary.