南水北调中线沙河段砂卵石地基渠段衬砌稳定处理方案探讨

Research for the Concrete Lining Scheme of the Pebble Foundation in the South-to-North Water Diversion Project

沙河市砂卵石地基渠段是南水北调工程河北段水文地质条件较为特殊的渠段，该段长度约1．8km，主要分布在南沙河南岸，地下水位常年位于渠底以上。为保证渠道衬砌结构稳定，提出结合工程地质及水文地质条件，依据渗流原理，采用三维模型对渠道抗浮稳定进行验算，对南水北调中线工程河北省沙河市砂卵石地基渠段衬砌稳定处理方案进行了筛选分析。

As a special canal section for hydro-geological condition, the foundation of Shahe City featured sand and gravel with a length of about 1.8 km in Hebei province, mainly located in the south bank of the South-ghahe River, and the section＇s groundwater level maintained above the channel bottom yearly. To ensure the stabilization of canal lining structure, this paper analyzes the processing so- lutions for Shahe City＇s canal section in Hebei province of the South-to-North water diversion middle Route Project. Based on percolation theory and considering both Engineering geological and hydro-geological conditions, the canal＇s anti-floating stability was checked by three-dimensional model experiments.