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达（县）成（都）铁路炮台山隧道全长3078m。隧道通过的地层为第四系坡、洪、残、堆、崩积以及上更新统冰水堆积层之砂粘土和碎块石土,下伏白垩系下统天马山组之砂岩夹泥岩砾岩,不穿过煤系地层。已建成的与炮台山隧道相距不远且地质条件类似的11座铁路隧道和2座高等级公路隧道,均未发现天然气。然而,1994年4月3日～4日,却在炮台山隧道出口平行导坑发生了瓦斯爆炸,造成重大伤亡事故。这是我国铁路隧道施工中,第一起在浅层（埋深约350m）穿越非煤系地层的瓦斯爆炸事例。
Da (county) Cheng (all) Railway Fortress Tunnel length of 3078m. The strata through which the tunnel passes are sands of clayey, underlain, piled, disintegrated, and uplifted ice-water deposits of sand and clayey rocks, underlain by the Lower Cretaceous Tianmashan Formation sandstone and mudstone conglomerate , Not through coal strata. No natural gas has been found in the 11 railway tunnels and two high-grade road tunnels that are close to the Fortress Hill Tunnel and have similar geological conditions. However, from April 3 to April 4, 1994, a gas explosion occurred at the parallel pilot pit exit of the Fortress Hill Tunnel, causing heavy casualties. This is the first case of gas explosion in China’s railway tunnel construction crossing the non-coal strata in the shallow layer (about 350 m in depth).