新建隧道开挖下穿既有高速公路数值模拟分析

Numerical Simulation Analysis on Excavation of New Tunnel Underpass An Existing Expressway

采用有限元计算软件MIDAS/GTS对某城市新建隧道下穿既有高速公路的开挖过程进行数值模拟,判断高速公路沉降值是否满足规范要求、是否需要采取防护措施。根据数值模拟分析结果,新建隧道下穿既有高速公路段采用超前大管棚支护、双侧壁导坑法施工,高速公路地表沉降对正常运营不产生影响。

Making numerical simulation upon the excavation of a new tunnel underpass an existing expressway by finite element analysis software MIDAS / GTS to determine whether a highway subsidence value meet standard requirements and weather protective measures should be taken. According to the result of numerical simulation,if the excavation of a new tunnel underpass an existing expressway adopting the advance large tubular tents supporting,double side drift method,highway ground surface settlement will not affect the normal operation.