三维渗流反演分析在深厚覆盖层中的应用

采用三维渗流理论对砂卵石层进行反演计算 ,根据覆盖层地质条件 ,建立三维渗流数学模型 ,然后给出一个渗透系数值 ,计算未建库前的地下水位 ,并与勘察所知的实际水位相比较 ,若两者不一致 ,则调整渗透系数 ,直至计算水位基本符合实测水位 以确定河床砂卵石层的渗透系数 ,为防渗处理提供可靠的设计依据

The application of back analysis of three-dimensional seepage flow in thick overburden

The paper discusses the determination of permeability coefficient of sand and gravel, based on the back analysis of three dimensional seepage flow theory, thus providing sound design basis for antiseepage treatment. According to the geological conditions of the overburden, a three dimensional seepage flow mathematic model is suggested, then a permeability coefficient is given, the groundwater level before the construction of the reservoir is caculated and compared with the measured water level. If the two levels are not consistent, the permeability coefficient is regulated till the calculated level conforms basically to the actual water level, and the permeability coefficient then is actual permeability coefficient of the overburden.