超长隧道斜井工区大规模突泥涌水泄水处治关键技术

Key Technologies for Treating Large-scale Water and Mud Inrush in Inclined Shaft Work Area of Super-long Tunnels

云南省华丽高速公路营盘山特长隧道2号斜井工区施工至ZK26+188时掌子面突发大规模持续性突泥涌水。针对“188”突泥涌水造成淹井和斜井口长时间涌水外流,对突水机理进行分析研究,综合比较3种处治方案,提出“暂且搁置斜井、正洞工区高压泄水、分阶段实施、稳步向斜井水头逼近”的泄水处治方案,成功攻克泄水难题,实现斜井积水的安全排放。实践表明,处治方案安全,经济等综合效益显著,可为类似特长高压富水岩溶隧道地质灾害处治提供指导和借鉴作用。

When the construction of the 2#inclined shaft work area of the super-long tunnel of Yingpanshan on the Huaping-Lijiang Expressway in Yunnan Province is tunnelled to ZK26+188,a large-scale continuous water and mud inrush occurred at the tunnel face.In response to shaft flooding and long-term water inflow at the inclined shaft mouth caused by water and mud inrush at ZK26+188,the mechanism of water inrush is analyzed and studied.Three treatment plans are comprehensively compared,and a water discharge treatment plan of"temporarily put aside the inclined shaft,discharge high-pressure water from main tunnel work area,implement the plan in phases,and steadily approach the head of the inclined shaft"is proposed.The water discharge problem is successfully overcome,and the water in the inclined shaft is safely discharged.The treatment plan has significant comprehensive benefits such as safety and economy,and can provide guidance and reference for the treatment of geological disasters in similar su⁃per-long,high-pressure,water-bearing karst tunnels.