复杂岩层坝基排水异常原因分析及渗控处理技术

针对某在建水库坝基白云岩细微裂隙发育、岩体强度低、基础承压水丰富、施工过程中出现了帷幕灌浆质量难以控制和坝基排水孔出水量大等问题,通过分析工程地质条件、监测数据和施工质量,提出在确保水库正常蓄水和坝体稳定的前提下,采用灌注湿磨水泥浆、适当加大灌浆压力、延长灌后闭浆时间等帷幕补强措施,取消或缩短坝基排水孔、在大坝下游增设适量承压水减压孔,达到了消除复杂岩层坝基排水异常的目的,相关技术可供类似工程借鉴。

Cause Analysis of Drainage Anomalies of Complex Rock Foundation and Technology of Seepage Control and Treatment

The foundation of a certain reservoir dam under construction has developed fine cracks in the dolomite,the rock mass has low strength,and the foundation dam has abundant confined water.During the construction process,the curtain grouting quality is difficult to control and the dam foundation drainage hole has a large amount of water.By analyzing the geological conditions,monitoring data and construction quality of the project,mitigating measures were proposed under the premise of ensuring the normal storage of the reservoir and the stability of the dam such as the use of wet grinding cement slurry,appropriately increasing the grouting pressure and extending the closing time after grouting,canceling or shortening the drainage holes of the dam foundation,and adding an appropriate amount of pressure relief holes downstream of the dam.These measures has achieved the purpose of eliminating the abnormal drainage of the dam foundation in complex rock formations.These technologies can be used for the similar projects.