Rolling tests on movement characteristics of rock blocks

Taking a typical slope as the test site,176.4 m in length and with slope gradient of 39～60°,nearly 90° in local,256 times rolling tests on rock blocks with the weight of 9.5 ～92.5 kg,whose shapes are strip,flaky and square,etc.,were done.Based on the results,the effects of slope features on the rock stopping position,the moving time(The kinetic energy arriving at the slope root) and the moving track of different rock block shapes were analyzed.Meanwhile,with the orthogonal test theory,the average acceleration velocity was chosen to be the evaluation index,and three important factors including the mass,the rock block shape and the slope condition(the slope gradient and overburden) were discussed.The results showed that the slope condition was the main factor,the second was the rock block shape,and the third was the rock block mass.The average acceleration was the maximum when the mass of the flaky rock block was 15≤m<27 kg and the average slope was 59.6° and the bedrock was exposed;the average acceleration is the minimum when the mass of strip rock block was 9.5≤ m<15 kg and the average slope was 39.0°,and there was some debris.The results provided the bombardment energy for the potential unstable rock mass prevention.A new feasible method for the potential unstable rock mass prevention was put forward.It would be important and helpful to the geohazard control work.