水库裂隙岩体渗透系数张量的确定

通过裂隙在空间展布状况的测量,用统计学方法初步确定裂隙岩体的渗透系数张量,获得渗透系数张量的主值及主方向。考虑到裂隙测量的误差,根据野外压水试验得到的单位吸水量,利用巴布什金公式计算岩体的各向同性渗透系数,对其进行修正,从而得到研究区裂隙岩体的修正渗透系数张量。并运用上述方法对蒲石河抽水蓄能电站上水库坝址区裂隙岩体的渗透系数张量进行了计算。结果表明,该方法能较好地反映裂隙岩体渗透性的各向异性特征,可为岩体渗透性分区及防渗帷幕的优化提供科学依据。

Determination of hydraulic conductivity tensor of fractured rock mass in reservoir

Based on the measurement of spatial distribution of fractures,the hydraulic conductivity tensor of fractured rock mass was determined using statistical method, and the values and directions of hydraulic conductivity tensors were obtained.In view of the measurement error of fractures,this hydraulic conductivity tensor is modified by the isotropic hydraulic conductivity determined by the Babuskin formula according to the field water pressure test.This method is applied to determine the hydraulic conductivity of the rock mass in the upper reservoir of Pushi River Pumped-Storage Power Station.The result shows that the method can reflect the anisotropic characteristics of the permeability of fractured rock mass,and provides scientific basis for zoning permeable rock mass and optimizing the impervious curtain.