单组裂隙压水试验的一个非稳定渗流模型

Non-steady Flow Model of Water Injecting Tests on A Group of Facture

非稳定渗流资料在常规压水试验中往往被忽略,也缺少成熟的分析方法,但可以提供裂隙渗流和变形特征的重要信息。借助于地下水动力学概念,考虑裂隙水流的连续性、应变渗透耦合效应、隙间串流、裂隙水贮存量变化等裂隙行为特征,建立了单组裂隙压水试验的非稳定渗流控制方程。在假设参数恒定的情况下,得到简化模型的解析解,并用于分析某花岗岩压水试验中的流量动态曲线,求出了裂隙导水系数、贮水系数和隙间串流参数。模型解释了常规压水试验中单位吸水量、参考渗透系数和实际渗透系数之间的关系。

Data of non-steady flow in normal water injecting tests is always ignored and is also lack of well-established analytical method. However, it can provide significant information of fracture seepage and deformation. By introducing concepts in groundwater hydraulics, considering characteristics of facture behaviors, such as continuity of flow in a fracture, coupling effect of seepage and deformation, flow across factures and storage change of fracture water, the governing equation of non-steady flow in a group of facture under injecting tests is developed. In a simplified condition of constant parameters, the analytical solution of the model is obtained and applied to analyze the transient flow rate in an injecting test of some granite, then the transmissivity, storage coefficient and parameter of flow across factures are determined. Relationships between absorption rate, referenced hydraulic conductivity and actual hydraulic conductivity for injecting tests are interpreted.