地下水封洞库灌浆止水施工技术及应用

Construction technology and application of grouting and water stop for underground water-sealed cave depot

本文利用超前预报,根据洞室开挖揭露的地质条件,合理确定施工预注浆孔和后注浆参数,采用“先预埋管、再覆盖封闭岩面,先灌外圈、后灌内圈,先灌无渗水孔、再灌小渗水孔、终灌大渗水孔”的灌浆施工程序,使洞室渗水量符合设计指标的要求。施工期间库区地下水位总体稳定,围岩变形量较小,洞室稳定安全,取得了良好工程效果。

The advanced prediction is utilized and the construction grouting hole and post-grouting parameters are rationally determined according to the geological conditions of cavern excavation exposure. The grouting construction procedure of“pipeline pre-casting followed by covering sealed rockface,outer ring grouting followed by inner ring,no-water seepage hole grouting followed by small seepage hole and large seepage hole”is adopted. The amount of cavern seepage is conformed to the designed indicator requirements. The reservoir underground water level is stable generally during construction. The surrounding rock deformation is less. The cavern is stable and safe with excellent project effect.