强富水弱胶结含水层下巷道掘进防治水技术

Water disaster prevention and control technology for roadway excavating under the water-abundance and weak cementation aquifer

为了解决在强富水弱胶结含水层下巷道掘进过程中所面临的防治水和支护难题,首先采用长距离定向钻探技术对顶板含水层进行富水性探查和顶板水预疏放,针对局部隔水层较薄的区域,采用钻孔和锚杆注浆技术对顶板含水层进行加固、改造,对巷道顶板较为破碎的区域采用U型钢棚加强巷道支护。经过实践验证,掘进巷道采取综合防治水技术后,涌水量显著减小,并且避免了水害和顶板事故的发生。长距离定向钻孔对巷道充水水源的探查和疏放,结合钻孔和锚杆注浆对导水通道的封堵,最后配合U型钢棚加强巷道支护,可以有效保障复杂水文地质条件下巷道掘进的安全。

Aiming at the difficulties in water disaster prevention and control,roadway support during roadway excavation under the water-abundence and weak cementation aquifer,first of all,long distance directional drilling technology is used to prospect the water yield property and drainage the water from aquifer on the tuunel.For the area with thin aquiclude,drilling and anchor bolt grouting is used to the roof aquifer reinforcement and aquiclude reconstuction.For the area that roadway roof is broken,U-shape steel shed is used to strengthen roadway support.According to the practical verification,the water flow significantly reduced after the comprehensive prevention and control technology for roadway excavation,and the water disaster and roof accident were avoided.The safety of roadway excavation under the complex hydrogeological condition can be ensured with prospecting and drainage of roadway water filling source with long distance directional drilling,water-conductive channel sealing with drilling and anchor bolt grouting,cooperating with U-shape steel shed roadway support reinforcement.