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

1. 研制并完成了节理剪切流试验装置的工作程序。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。耦合试验采用下试件注入孔允许水流的方式进行。利用所研制的装置，成功地完成了法向应力控制试验和法向位移控制试验（即保持结构面平行状态）与渗透率试验同时进行。然后让水通过一个孔流到边缘。水流过迷宫闸门后，自动测量流量。在0.3MPa法向应力阶段，峰值剪切清晰可见，而在其他法向应力阶段，峰值剪切不出现。随着法向应力的增大，残余剪应力也随之增大。在正常应力为0.6MPa时发生扩张。之后，法向位移逐渐减小。在0.3MPa的法向应力下，随着剪切位移的增加，水力导率迅速增加到约2个数量级。利用激光剖面仪测量了结构面三维凹凸不平度，给出了剪切-流动耦合试验中的三维结构面分布图。对岩石节理剪切-流动耦合过程进行了真实的模拟，得到了节理的行为特征。

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.