船闸室喀斯特地下水处理研究

Study on Treatment of Karst Groundwater in Lock Chamber

大藤峡船闸工程3号喀斯特地下水出水口位于闸室左边墙第4块与第5块之间,桩号约为航下0+116,出口顶部高程约-2.00m,底部高程不明,涌水处水面高程为-5.00m,水面宽度约7m,涌水流量约为1600m3/h,坡面内肉眼可见喀斯特空腔长约8m,宽约5m,高约5m。上述涌水严重影响船闸混凝土浇筑施工,现为满足混凝土干地施工要求,采用自流引水和抽排相结合、混凝土封堵的方案进行分阶段处理,有效完成船闸闸室3号喀斯特地下水封堵,保证船闸大体积混凝土浇筑质量和安全。

No.3 Karst groundwater outlet of Datengxia Lock Project is located between Block 4 and Block 5 on the left side wall of the lock chamber.The pile number is about 0+116 under navigation.The elevation at the top of the outlet is about-2.00m.The elevation at the bottom is unknown.The water elevation at the water burst is-5.00m,the water width is about 7m,and the water burst flow is about 1600 m3/h.A Karst cavity can be observed by naked eyes on the slope surface,it is as long as about 8m,as wide as about 5m and as high as about 5m.The above water burst has seriously affected the concrete pouring construction of the lock.Now,the scheme of combining self-drainage water diversion and pumping drainage as well as concrete sealing is adopted for phased treatment in order to meet the requirements of concrete dry ground construction so as to effectively complete the sealing of No.3 Karst groundwater in the lock chamber and ensure the quality and safety of mass concrete pouring of the lock.