多轴应力作用下砂砾岩单裂隙渗流规律试验研究

用劈裂的方法在砂砾岩块上制造裂隙来模拟天然岩体的张性裂隙,在自行研制渗流-多轴应力耦合试验机上开展了一系列单裂隙渗流应力耦合试验,分别研究了垂直于裂隙面加载、平行于裂隙面加载对裂隙渗透能力的影响规律,对单裂隙岩体在多轴应力作用下的渗流规律作了探讨.成果表明,法向应力和侧向应力对裂隙的渗透系数有着明显的影响,共同决定着渗透系数的变化.

Experiment Research on the Laws of Seepage in Calcirudite Rock within Single Fracture under Multiaxial Stresses

A single fracture in calcirudite rock was formed by splitting to simulate the natural extension fracture.A series of coupling experiments on stress and seepage of the rock with single fracture were carried out through "testing machine on coupling seepage and multiaxial stresses".The effects of normal loading and lateral loading on the permeability coefficient of fracture were studied.The experimental achievements show that the normal stress and the lateral stress have remarkable effect on the permeability coefficient of fracture.When the fracture keeps stable,the pore hydraulic pressure and normal stress play a more important role than lateral stress.It is also found that the effect on the fracture permeability coefficient caused by creep deformation should not be neglected in most cases.