南河坝区岩溶地下水流场分析

ANALYSIS OF FLOW FIELD OF KARST GROUNDWATER IN NANHE DAM AREA

本文在划分岩溶含水介质类型的基础上，对坝区岩溶地下水流场受降雨和库水位因素影响的动态特征、流场性质及与工程的关系进行分析，并建立地下水动态的预测模型。

Karst water.bearing mediah Nanhe dam area can be divided into three basic types:solu-tion fissure,crack of fracture zone and solution conduit.Analysis of monitoring data indi-cates that karst groundwater level changes dynamically due to the variations in rainfall andreservoir water-level, and the dvnamic characteristics and features of the flow field are con-trolled by the type of water-bearing medium. Very high hydraulic head would form whenrainfall with great intensity happens in wet season,which would be a potential threat to thesafety of the dam, Crack flow of fractured zone F_(92) at the right dam abutment rnay havesomething to do with around-dam leakage. Water level of basic solution fissure flow at re-taining wall is low and steady, which means that serial engineering measures taken for theslope behind the power plant have had obvioug effects. As for the karst dam area,establish-ment of the dynamic prognostic model for underground water,in consideration of the influ-ence of rainfall and reservoir water-level,has practical value.