长江某水电站库区HP村浸没问题研究

长江某水电站库区HP村处于长江Ⅰ级阶地平台,地势低平,分布大量耕地和民房,水库蓄水后浸没问题突出.通过研究该岸段水文地质结构及天然地下水流场、土层毛管水上升带高度、耕植层厚度、房屋基础类型、埋深、地基土体天然、饱和状态下力学特性并分析地下水位上升对地基安全影响深度等,综合确定浸没临界地下水埋深标准值;采用有限元法分析预测水库蓄水后稳定、非稳定流地下水回水特征.以此为基础进行浸没判别,确定浸没影响区范围和影响程度,为水库影响区范围界定提供可靠依据.此浸没研究方法和技术成果可供类似工程参考.

Study on HP Village Immersed in A Reservoir Area of the Yangtze River

HP village is located at the reservoir area of a hydropower station, which is situated on the first stage terrace of Changjiang River. Due to the low and flat terrain of the village and the fact that legions of farmlands and civil houses are in and around the village, the reservoir immersion will be a serious problem. The standard critical groundwater depth of reservoir immersion is comprehensively determined by researching the hydrogeological mechanics, the natural groundwater flow field, the lifting height of capillary water in soil stratum, the thickness of the cultivation layer, the type and the burial depth of the foundation, the mechanical properties of foundation soil mass under the natural state and saturated state in the area of the village, the influential depth of the foundation with the fluctuation of groundwater, etc. The features of the steady flow and unsteady flow backwater after the reservoir runs are analyzed and anticipated by using finite element method. The immersion discrimination and the determination of the level of immersion effect and impact the area are based on the above-mentioned methods. The reliable basis of determining the reservoir affected zone is provided by using this discrimination. The study methods and technological achievements can be the reference for similar projects.