高速铁路浅埋大跨度隧道下穿公路施工安全性分析

Analysis on Construction Safety of Shallow Large-span Tunnel Passing through the Road for High-speed Railway

摘要:

成都至贵阳客运专线南厂沟浅埋大跨度隧道下穿公路，重载车辆繁多，对隧道施工安全及道路行车安全造成威胁。采用FLAC3D软件分别对无行车条件下和行车荷载作用下施工过程进行了数值模拟，对比分析了两种工况下的受力及变形，结果表明，行车荷载对该隧道施工影响较小。下穿施工过程及监测数据分析表明，南厂沟隧道下穿公路数值模拟是合理的，为顺利施工提供了有益指导。

关键词:浅埋大跨度隧道;下穿公路;行车荷载;南厂沟隧道

Abstract:

In the construction of Nanchanggou shallow large-span tunnel which passed through the road for the passenger dedicated line of Chengdu to Guiyang, various heavy vehicles posed threat to the tunnel construction and road traffic safety. FLAC3D was used for numerical stimulation of construction progress under the conditions of no traffic and with traffic load respectively to analyze the stress and deformation under the different working conditions. The results showed that the traffic load had little effect on the tunnel construction. The analysis on the tunnel passing process and the monitoring data show that the numerical stimulation of under-passing Nanchanggou tunnel is reasonable, which provides useful guidance for construction.

Key words:shallow large-span tunnel; under-passing road; traffic load; Nanchanggou tunnel