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新疆下坂地水利枢纽坝基覆盖层深达147.95 m,其结构较为复杂,主要由冰碛层、冲洪积砾石层和砂土层透镜体组成。坝基透水性强,易坍塌和漏浆,块石坚硬,基础防渗处理难度为国内外罕见。工程可行性研究阶段坝基处理推荐“上墙下幕”的垂直防渗形式,为了验证这个方案的合理性和可行性,以确保能够给初步设计提供可靠的依据,有关单位配合对下坂地水库坝基基础垂直防渗处理进行了现场试验,并取得了试验成功。
The cover of Xibazandi Hydro Project in Xinjiang reaches a depth of 147.95 m. Its structure is complicated and mainly composed of moraine layer, alluvial-gravel layer and sand layer lens. Dam foundation permeability, easy to collapse and leakage of slurry, block rock hard, the basic anti-seepage treatment difficulty rare at home and abroad. In order to verify the rationality and feasibility of this project to ensure that it can provide a reliable basis for the preliminary design, the relevant units cooperate with the foundation of the Xiabandi Reservoir Dam Foundation Base vertical anti-seepage treatment conducted on-site test, and achieved a successful test.