嵩明县八家村水库扩建工程防渗处理方案及效果评述

Anti-seepage Treatment Scheme and Performance Review on Bajiacun Reservoir Expansion Project in Songming County

八家村水库地质条件复杂,库区基岩系石灰岩及砂页岩组成,岩溶发育(尤其左岸),断层裂隙交错,为典型的喀斯特碳酸盐岩地区,库底和坝址没有相对隔水层。水库扩建时为节省工程投资,防渗处理方案为比较节俭的悬挂式帷幕灌浆。通过观察、观测灌浆前后老坝背水面、坝脚和左岸山体下游的渗漏情况,分析渗漏量大小及其变化趋势,查找渗漏通道,进行补强灌浆,使防渗处理取得较好的效果。

The geological conditions in Bajiacun reservoir are complex. The bedrock of the reservoir area consists of limestone and sandshale. With karst development （especially on the left bank） and interlaced fault fissure, the reservoir is located in typical karst carbonate area, and there is no water barrier between the bottom of the reservoir and the dam site. In order to save investment, the low-cost suspended curtain grouting method is selected as the anti-seepage treatment scheme in the expansion of the reservoir. By observing the leakage on the back surface and the dam toe of the original dam as well as the downstream of the mountain on the left bank, the amount of leakage and its trend are analyzed, leakage passage is searched, and then strengthening grouting is conducted, thus obtaining satisfying anti-seepage performance.