黔中水利枢纽左岸岩溶管道处理时机选择

Timing Selection of Karst Pipeline Treatment on Left Bank of Qianzhong Water Conservancy Project

黔中水利枢纽一期工程水源平寨水库位于乌江南源三岔河上,坝区河谷为横向谷,横向发育了多条地下水岩溶管道系统,管道系统规模较大,其中有3条与左岸防渗帷幕交叉,交叉部位采用混凝土封堵。由于左岸防渗帷幕工程量大,灌浆耗时长,需经多个丰枯季节,为保证管道系统处理效果和帷幕运行安全,管道系统处理时机选择很重要,既要考虑丰枯季节影响,又要注意与周围灌浆孔实施的先后顺序。工程将管道系统作为排水通道,先行实施管道两侧灌浆孔,选择枯季对管道系统进行封堵处理,经蓄水验证,帷幕运行效果良好。

The water source Pingzhai reservoir is located in Sanjiahe River on the south bank of the Wujiang River. The dam area is a horizontal valley, and several groundwater karst piping systems are developed horizontally. The pipeline system is large in size, and three of them are separated from the left bank Curtain cross, cross the use of concrete block. Due to the large amount of anti-seepage curtain on the left bank, the time of grouting is long and needs to go through many season. In order to ensure the safety of the pipeline system and the safety of the curtain operation, it is very important to consider the timing of the pipeline system. Pay attention to the order in which the surrounding grouting holes are implemented. The pipeline system is used as the drainage channel, and the grouting hole on both sides of the pipeline is implemented first. The dry season is selected to block the pipeline system, and the curtain operation is effective.