Development of Shear-Flow Coupling Test Apparatus of Rock Joints

以放射性废物处置场为代表的地下利用问题，使得研究裂隙岩体的水流特性变得更加重要，从这个角度出发，开发了一种新的测试装置，以实现剪切-流动耦合测试。该装置用于研究峰值应力后残余节理的剪胀流动特性。(1)研制了允许大剪切位移和高法向应力的剪流耦合试验装置，并建立了控制和测量的试验程序。(2)利用该装置，研究了人工节理硬花岗岩试件的剪切变形对节理导水率的影响。(3)在所有范围内，导水率随着剪切位移的增加而增加，认为是由于凹凸体的骑行和断裂导致裂隙开度的增加。(4)试验获得的剪切流动特性与某些预测相符，考虑了理论和物理开度、裂隙表面。

The subject of underground utilizations whose representative is radioactive waste disposal sites has enhanced the importance of investigating water flow characteristics of fractured rock masses.From this point of view, a new testing apparatus has been developed to enable shear-flow coupling testing. This apparatus is employed for investigating the shear-dilation-flow characteristics of joints extending over the residual regions after a peak stress.(1) A Shear-flow coupling test apparatus which allows large shear displacement and high normal stress was developed, and a testing procedure for control and measurement was established.(2) Using this apparatus, the effect of shear deformation on hydraulic conductivity of a joint has been investigated for artificial jointed hard granite specimens.(3) Hydraulic conductivities increased with increases of shear displacement at all ranges of considered to be an increasing of fracture aperture due to the riding and the break of asperities.(4) Shear-flow characteristics obtained from the test agree with certain predictions, which take account of the theoretical and physical apertures, fractured surfaces.