花岗岩单节理剪切-渗流耦合特性试验研究

Experimental Study on Shear-Flow Feature of Granite Joints

在介绍JAW-1000型岩石单节理剪切-渗流耦合试验系统的结构和各项功能的基础上,应用该系统对4组花岗岩节理试件进行了常法向荷载和常法向刚度2种条件下的剪切-渗流耦合试验,分析花岗岩节理剪切过程中的剪切应力、法向位移及水力开度的变化规律。结果表明,花岗岩节理的剪切应力、法向位移及水力开度均呈现2个阶段的变化规律;随着剪切次数的增加,节理面的峰值剪切应力及残余值降低,剪胀点延迟,节理面的初始水力开度显著提高,法向位移和水力开度变化曲线逐渐趋于平缓。

The structure and functions of JAW-1000 apparatus are described. By using this experimental system, the shear-flow tests of four specimen groups of granite joints are carried out under the conditions of CNL and CNS to analyze the variation rules of shear stress, normal displacement and hydraulic aperture of granite joints. It is shown that： （a） all the shear stress, normal displacement and hydraulic aperture of granite joints present a variation rule of two-stage; and （b） with the increase of shearing number, the peak value and residual value of shear stress are decreased, the dilatancy point is delayed, the initial hydraulic aperture of joints is significantly improved, and the curves of normal displacement and hydraulic aperture are gradually flatten.