浅埋暗挖风道进主体施工技术优化分析

地铁开挖过程中引起的地表沉降对周边建筑及道路有很大的影响,浅埋暗挖风道与主体交叉段的施工是工程中的重难点工序,为控制施工过程中地表沉降量,并对施工进行指导,做出以下研究:以长春地铁解放大路换乘工程为依托,采用FLAC-3D程序数值模拟的方法对CRD风道转入PBA工法车站主体进洞施工进行优化分析;通过对比双拱挑高进洞方案、加强环梁进洞方案与直接进洞方案在风道和主体开挖阶段地表沉降量,发现在风道开挖阶段,双拱挑高进洞方案沉降量较小,而主体开挖阶段,加强环梁进洞方案沉降量较小,得到如下结论:(1)双拱挑高进洞方案在风道开挖阶段对地表沉降控制较好;(2)加强环梁进洞方案在主体开挖阶段对地表沉降控制较好。

Optimization of Construction Methods for Shallow Buried Covered Excavation Air Duct Enter Tunnel

The ground surface settlement caused by metro construction has a great influence on surrounding buildings and roads. The construction of cross section of shallow buried covered excavation air duct and metro is the key and difficult process. In order to control the surface settlement in the construction process, and to guide the construction, the paper makes the following research: for the purpose of optimization of construction methods for shallow buried covered excavation CRD air duct enter PBA tunnel, we have established the numerical simulation model of Jiefanglu Station of Changchun Metro with the program of FLAC-3D. Comparison and contrast is made among direct broken horsehead, double arch hoist and strengthened ring beam, after analysis the ground surface settlements when excavating air duct and tunnels, we find that when the air duct is excavated, the settlement of double arch hoist is minimum, and when the tunnel is excavated, the settlement of strengthened ring beam is minimum. we can get the result: (1) The cast double arch hoist is superior to other methods, when the air duct is excavated, (2) The cast strengthened ring beam is superior to other methods, when the tunnel is excavated.