Establishment of shear-flow coupling test and GIS numerical model of rock joint

1.研制了岩石节理剪切流试验装置，并完成了该装置的工作程序。通过控制两个千斤顶，尽管岩石节理形状不规则，但在剪切作用下仍施加正应力。耦合测试是通过让水流过下套管的注入孔来进行的。利用该装置成功地完成了正应力控制试验和保持结构面平行状态的正位移控制试验，并与渗透性试验同步进行。然后允许水通过孔流出到边缘。在流过迷宫式闸门后，水流量自动测量。在0.3MPa的正应力下，剪切峰值明显，而在其它正应力阶段，剪切峰值不明显。随着法向应力的增大，残余剪应力也增大.直到0.6MPa的正常应力时才发生扩张。之后，正常位移逐渐减小。在法向应力为0.3MPa时，随着剪切位移的增加，渗透系数迅速增大，约为2个数量级.利用激光轮廓仪测量了剪切流耦合试验过程中结构面的三维粗糙度，并给出了三维结构面分布图。对岩石节理的剪流耦合过程进行了模拟，得到了节理的力学行为特征。

1. Shear-flow testing apparatus of rock joint has been developed and accomplished for its procedure of operation. By controlling the two jacks, normal stress is applied under shearing despite the irregular rock joint shape. The coupling test is conducted by allowing water to flow through the injection hole of the lower specimen.2. By using the apparatus developed, the normal stress control test and the normal displacement control test that is the keeping of parallel condition of discontinuities, has been successfully accomplished with permeability test simultaneously. The water is then allowed to flow out to the edge through an aperture. After flowing over the labyrinth gate, water flow rate is automatically measured. At a normal stress of 0.3MPa, the peak shear is clearly shown, but at other normal stress stages, it does not appear. It also shows that with increasing the normal stress, residual shear stress increases. The dilation occurred until 0.6MPa of normal stress. After that, the normal displacement is gradually decreasing. At a normal stress of 0.3MPa, the hydraulic conductivity rapidly increases to about 2 orders of magnitude with increasing shear displacement.3. 3D asperities of discontinuities has been measured by laser profile apparatus and presented the 3D discontinuity distribution map during shear-flow coupling test. The simulation of shear-flow coupling process of rock joint is faithfully carried out and gotten the characteristics of the behavior of joint.