THE ACCIDENTS CAUSED BY FALLING ROCKS AND ITS BEHAVIOR IN KOCHI PREFECTURE

This report aim is to evaluate and study the critical behavior of falling rocks situated along the road in the mountain. According to the reporters who met the accident caused by falling rock, it occurred about ten times in one year. It damaged vehicles. Here, we gather three cases and each cases man was killed by the falling rock. Therefore, the location, the geological rock bed, rock slope were traced. It was studied through determining the critical velocity and maximum projectile distance from falling slope by calculation. By experimental data, maximum velocity and projectile distance from falling slopes were obtain. Comparing the values with the unpredictable falling rocks value, effect of trees were evaluated. At last, it clarified that the effect of the natural trees lessen the falling rocks' characteristic in motion.