娄邵铁路扩能改造工程隧道洞门选择探讨

Summarize of Railway Tunnel Portal for Capacity Expansion Project in Rebuilding Lou Shao Railway

娄邵铁路扩能改造工程隧道洞门形式主要有喇叭口倒斜切式洞门、帽檐斜切式洞门及墙式洞门。设计中优先采用斜切式洞门,以满足安全、环保及乘客舒适性要求。局部地形较陡洞口采用喇叭口倒斜切式洞门,根据现场地形、地质条件可采用明做、明洞暗做等工法,充分考虑隧道洞门的稳定因素,优化洞门设计。

Reversal bamboo-cutting bell mouth portal、the capping eaves type portal、wall tunnel portal are used for capacity expansion project in rebuilding lou shao railway.Based on safety、pro-environment and cosiness of passengers,the capping eaves type portal is more used than other portals.Reversal bamboo-cutting bell mouth portal is used in steep land form of some tunnel exits.Based on landform and geological situation,open excavation method、undermining method of open hole are used after mulling stabilizing factors of portals,which makes the designing of portals more perfect.