飞仙关特长隧道高压涌突水形成机制及处治技术研究

Formation and Treatment of the High-Pressure Water Inflow in the Extra-Long Feixianguan Tunnel

文章以雅康高速公路飞仙关特长隧道K23+708段高压涌突水为例,通过现场调查涌突水灾害,监测和统计涌水量历时特征,分析其形成原因与力学机制,确定了"排堵结合,限量排放"的治理原则,并结合致灾原因提出了"临时加固初期支护变形段+疏排地下水+小导管周边注浆+加强仰拱及衬砌刚度"的综合处治方案。飞仙关隧道特大涌突水成因机制分析及其处治措施研究可为其它类似隧道的高压涌突水灾害综合处治提供参考。

Using the inflow at K23＋708 of the extra-long Feixianguan tunnel on the Yakang highway as an exam- ple, the formation mechanism of the water inflow was analyzed based on data from site investigations, monitoring and statistics regarding the time-history characteristics of the inflow; it was determined to exhibit a ＂combination of draining and blocking with limited discharging.＂ A comprehensive treatment scheme is put forward that includes temporarily reinforcing the deformed primary support, draining the grouml water, employing peripheral grouting with condulets and strengthening the stiffness of inverted arch and lining.