Experimental research on the normal closure deformation of infilled rock joints
The normal closure of rock joint is one of the key factors affecting the mechanical and seepage behaviours of rock masses,and sand particles or other gouges are often filled in natural rock joint to form an infilled rock joint.However,there are abundant researches on the normal closure deformation of clean rock joints,while few researches on the normal closure of infilled rock joints have been reported.In this study,artificial rock joints with the morphology of the 5th and 8th Barton's standard profiles were prepared by using rock-like materials,and quartz sand was chosen as the filling material to prepare artificial sand-infilled rock joint specimens with nine filling degrees.Then laboratory normal closure tests were conducted on these artificial sand-infilled rock joint specimens and their normal closure curves were obtained.According to the experimental results,the influences of infilled material on the normal closure of sand-infilled rock joints were analysed,and the power function was used to fit the normal closure curve and the maximum normal closure of sand-infilled rock joints with different filling degrees,thus establishing the empirical normal closure model and the empirical maximum normal closure formula of the infilled rock joint,respectively.
rock mechanicsinfilled rock jointnormal closure deformationfilling degree
NETL
NSTL
万方数据
