侧向应力对裂隙渗透性的影响

Effect of lateral stress on rock fracture permeability

摘要: 目前不同试验者得出的侧向应力对裂隙渗透性影响的结果存在矛盾,其根本原因在于侧向应力对裂隙有多方面的影响。侧向应力引起裂隙开度增加、壁面磨损、充填物压缩。这些对裂隙渗透性有不同的影响。根据裂隙是否存充填物,建立了相应的三维应力对裂隙渗透性影响的表达式。当不存在充填物时,裂隙渗透性与侧向应力呈指数关系,当存在较多充填物时呈负指数关系。把两种情况写成统一的指数形式,认为裂隙存在少量充填或者裂隙壁面磨损时也是适合的。利用已有的试验成果对结果进行了验证,表明本文建立的表达式与试验结果符合得比较好。

Abstract: There are contradiction conclusions from different experimenter of the influence of lateral stress on rock fracture permeability.The reason for this is that the lateral stress has multi-aspect influences on a fracture.The lateral stress may cause crack opening increase,fracture wall attrition and filing compression.All of these have different influences on the fracture permeability.Expression of the influences of three-dimensional stress on the fracture permeability has been established accordin...