关键词: 劈裂砂岩, 渗流量, 凹凸高差, 节理粗糙度系数

Abstract: Taking the splitting sandstone from Yichang as the research object, the paper respectively studies about seepage flow variation rules caused by axial compressions, confining pressures, splitting surface area, concave-convex height different, trace length, 2D projected area of splitting surface, import and export length and joint roughness. The results suggest that the axial compression and seepage flow are in linear increasing relation whether the specimen is filled or not; confining pressures and seepage flow are in a relationship of logarithmic decrement when the specimen is unfilled, while in linear relation as the specimen is filled. Under non-filler condition, the seepage area has a cubic function to the seepage velocity, while there is no influence under filling condition, and at the same time, the concave-convex height difference, 2D projected area have the same rule with seepage velocity. Analysis suggests that the influence on seepage passages of the three factors is far from that caused by fillers; under non-filler condition, the trace length reduces linearly with the seepage velocity; the joint roughness coefficient shows a quadratic functional relationship with the seepage flow whether the specimen is filled or not. These rules can guide the priorities of factors in the seepage measurement, and effectively reduce the measurement of those secondary factors and provide a reference for numerical simulation of seepage.

Key words: splitting sandstone, seepage flow, concave-convex height different, joint roughness coefficient