摘要:
本文提出了一种既能反映裂隙岩体的渗透特性,又相对准确的确定裂隙岩体渗透张量的方法。首先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张量,获得渗透主值及主方向,然后根据野外压水试验得到的岩体透水率,利用巴布什金公式计算各试段岩体的渗透系数,求出修正系数,从而得到研究区裂隙岩体的修正渗透张量。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张量进行了计算。结果表明,该方法能较好地刻画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。
Abstract:
A method for determination of permeability tensor of fractured rock was presented,which not only can reflect the permeability characteristic of fractured rock,but also is relative accurate.First based on the measurement of spatial spread status of fractures,the permeability tensor of fractured rock was determined preliminarily using statistics method,the principle values and directions of which were obtained,then according to the permeability rate of rock from field water pressure test,the hydraulic conductivity of rock was calculated with Babushijin formula,and the correction coefficient was computed,thus the modified permeability tensor of fractured rock in the research area was obtained.Besides,the permeability tensor of fractured rock in dam site of upper reservoir of Pushihe pumped-storage power station was calculated with above method.The result shows that the method can better depict the anisotropic character of the permeability of fractured rock,and can provide scientific basis for the permeability zoning of rock and optimization of impervious curtain.
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