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Abstract The visible resistance of trees to rolling rock is the efficient measurement to prevent potential unstable rock mass. Based on the theory analysis of collision probability between rolling rock and trees，resistance effect experiment of trees on rolling rock is designed. Through the experiment，the collision probability between rolling rock and trees，rolling rock displacement after collision，and the change of velocity and kinetic energy due to the collision are studied. And the calculation and analysis method are attained for the collision probability between rolling rock and single row or several rows of trees，for the probability of at least k times collision between rolling rock and trees，and for the number of tree row needed to collide k times，and the correctness is verified through another experiment. Based on the analysis of the change of rolling rock movement displacement after collision to trees，it shows gets that rolling rock movement displacement on platform could decrease by 80%–100% after collision to trees，which accountes for 44.86% of collision in total to trees. The proportion more than 20% is up to 85.11%. After anyone collision，the velocity of rolling rock could decrease to 55% of that before the collision，and corresponding kinetic energy could decrease to 30%. So the number of tree row needed could be calculated when trees are used as the passive prevention measurement to dangerous rock mass. These conclusions provide proof to determine the number of tree row that is needed to prevent rolling rock，and they have practice significant to the prevention of slope geohazards.
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Received: 16 December 2008
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