湖南镇大坝右坝肩地下渗流变化规律分析

湖南镇大坝右坝肩地下水位长期偏高,相关统计分析结果库水位是主要影响因素;较高库水位时的渗流场分析表明,库水渗过18~22坝段和右灌浆平洞基础,直接对右坝肩地下水进行补给;水文地质条件和地下水质分析揭示出,18坝段以右坝基存在深层防渗薄弱部位,应采取帷幕加深补强灌浆并辅以排水等措施,降低右坝肩地下水位,以保证右坝肩和大坝的长期安全稳定。

Analysis on change pattern of groundwater seepage in the right abutment of Hunanzhen dam

The groundwater level in the right abutment of Hunanzhen dam is slightly higher for a long time.The related statisical analysis indicates that the reservoir water level is the main effect element.The seepage field analysis at the higher reservoir level shows that the reservoir water seeps through the blocks No.18 and 22 and the foundation of the right grouting adit,directly replenishes the groundwater of the right abutment.The geohydrological condition and the groundwater quality analysis reveal that the foundation from the right of the block No.18 exists in the deep-layer anti-seepage weakened part.The measures should be taken to deepen curtain grouting for rehabilitation and to drain water in order to decrease the groundwater level and ensure the long-term safety and stability of the right abutment and the dam.