CAUSE AND PREVENTION OF ROCKFALL DISASTER FOR ROCK PAINTINGS IN HELANKOU

Collapse is the most devastating disaster in natural landscape scenic spot. There are 34 potential rockfalls distributed in different positions of Helankou. All potential rockfalls pose a serious threat to rock paintings and tourists. Firstly, we comprehensively investigated the genesis, distribution, lithology and geometric characteristics of the 34 potential rockfalls. Secondly, we used the rockfall to analyze the movement process and energy change of the rockfalls. And then we found that there was a high probability that the falling points of the rockfalls can be the rock painting area and the tourist boardwalk. So we decided to use manual cleaning methods to clean up the potential rockfall, because mechanical and blast cleaning could cause irreparable damage to rock paintings. For the large-volume rock, it was better to crush by static crushing agent first. Finally, we did the rock crushing experiment to select the optimal arrangement of static crushing agent. We had the following conclusions. (1)The reasons for the formation of the potential rockfall are the concave of thin-layer, the rock layer level, and the two sets of joints to cut the thick-layer metasandstone. (2)The rockfalls can be divided into three different types: bedrock exposed, solitary belt, and debris flow gully. (3)It is very likely that the falling rocks can fall in the rock paintings area and destroy the rock paintings. (2)The best solution for the control of rockfall is static crushing combined with manual handling. And there is an optimal arrangement of static crushing agent. In short, our study can provide a new way and reference for the prevention of the rockfall disaster in Helankou Rock Painting.