岩溶区导流洞汛前封堵风险分析与对策措施

Risk analysis and measures of blocking diversion tunnel in karst region before the flood season

为实现平寨水库汛前下闸蓄水目标,对导流洞开挖揭露的溶洞及裂隙、临近汛期洪水量级大、水库水位上升快,由此可能出现衬砌结构失稳破坏、涌水量大导致封堵失败进行了风险分析。经充分论证和精心施工,完成了导流洞提前封堵,为类似强岩溶发育区大断面导流洞汛前下闸蓄水提供参考。

To achieve the goal of restaining water of Pingzhai Reservoir before the flood season, the risk of blocking diversion tunnel unsuccessfully was analyzed. It caused by the cave and fissure from excavating the diversion tunnel, reservoir water level rising quickly, the unstability of the lining structure and large water inrush. Due to full demonstration and careful construction, blocking diversion tunnel was accomplished beforehand which provided a reference for restaining water of diversion tunnel before the flood season of the large section of similar strong karst area.