隧道采空区突泥涌水处理技术

龙岩江山隧道施工中在K3＋370-500段先后出现特大突泥涌水地质灾害，施工中采取了管棚加固、双液注浆封堵、分段花管排水等综合措施，隧道施工安全通过了涌水段，通过营运3a的监测证明了治理是成功的。对于采空区在塌腔顶形成高压水的塌体施工宜采用随挖随堵、逐榀逐环、稳扎稳进的开挖支护方法。

Techniques for the Treatment of Mud Outburst and Water Gushing in the Mined Zone of the Tunnel

During the construction of the Jiangshan Tunnel, some serious geological disasters of mud outburst and water gushing occurred in Section K3q-370-500. During the construction taken were some comprehensive measures such as grouted pipe-roofing, double grout sealing and segment perforated pipe drain- age, etc. , which ensured the safe construction in the water gushing section. After three years＇ monitoring of the operation of the tunnel, it is found that the treatment is successful. Practice proves that in the mined zone, for the construction of the collapsed body where high pressure water is formed on the top of the collapsed cavity, the following excavation and support methods should be adopted： excavating with the blocking done at the same time, using steel supports section by section and performing safe and steady excava- tion and supporting step by step.