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.