第三系富水泥质弱胶结粉细砂岩隧道施工关键技术

The Key Technology of the Construction of the Tertiary Water-rich and Weakly Cemented Sandstone Tunnel

针对兰渝铁路桃树坪和胡麻岭隧道第三系富水泥质弱胶结粉细砂岩施工中出现的问题,通过对围岩物性、力学参数和特殊复杂水稳特性的研究,揭示了第三系富水泥质弱胶结砂岩工程特性和水稳特性;结合现场工程试验,确定了"重降水、密导管、强支护、辅注浆、快挖快支快封闭"的关键施工技术,确保了施工安全.

In view of the problems existing in the construction of the tertiary water-rich and weakly cemented sandstone in Taoshuping Tunnel and Humaling Tunnel on Lanzhou-Chongqing Rail- way, the surrounding rock properties, mechanical parameters and special complex water stability are studied to reveal the characteristics of engineering and water stability of the tertiary waterrich and weakly cemented sandstone. Combined with the field engineering test,the key construc- tion techniques of valuing precipitation, dense conduit, strong support, auxiliary grouting, quick excavation,quick support and quick closure are determined so as to ensure the safety of construc- tion.