防渗帷幕作为解决水库渗漏问题的最主要手段,在水电工程建设中被广泛应用。近年来,在我国西南地区水电工程陆续兴建,由于西南地区碳酸盐岩地层发育、岩溶条件复杂,防渗帷幕施工期,局部灌浆量大、串浆、漏浆等灌浆异常时有发生。乌东德水电站作为典型碳酸盐岩地区修建的巨型水电站,最大坝高270 m,最大挡水水头约160 m,具备帷幕规模大、水头高、地质条件复杂的特点。针对该电站大坝防渗帷幕左岸高程850 m灌浆平洞的局部灌浆异常,在利用灌浆孔、专门勘察孔、施工支洞、物探检测等传统手段的基础上,创新性依托“GEAS 3D(灌浆工程三维地质信息可视化分析系统)”,结合海量灌浆施工资料进行综合分析,查明异常区范围及工程地质特征、灌浆特征,为下一步针对性处理提供依据。研究成果提供了一种基于“地质BIM+灌浆信息化”分析管理平台的灌浆异常综合分析解决方案,可为类似工程提供借鉴。

As the most dominant means to tackle reservoir leakage, anti-seepage curtain has been broadly used in the construction of hydropower projects. In recent years, many hydropower projects have been built in southwest China where carbonate strata develops widely with complex karst conditions, giving rise to frequent grouting abnormalities such as excessive amount and leakage in construction period of anti-seepage curtain. As a giant hydropower station built in typical carbonate rock area, Wudongde hydropower station has a maximum dam height of 270 m and a largest water retaining head of about 160 m, with large curtain scale, high water head, and complex geological conditions. In view of the local grouting abnormality at 850 m grouting adit on the left bank of anti-seepage curtain of the dam, we propose to employ a “3D geological information visualization of grouting engineering analysis system (GEAS 3D)” for examining the scope of abnormal area, the engineering geological characteristics and grouting characteristics in association with traditional means such as grouting hole, special investigation hole, construction branch hole and geophysical detection so as to provide basis for targeted treatment. This paper offers a solution for grouting anomaly comprehensive analysis based on “geological BIM plus grouting information” analysis management platform, which can be used for reference for similar projects.