Study On Risk Assessment And Mitigation Decision-making Method Of Rockfall

In this paper,a risk assessment and mitigation decision-making method of rockfall is established starting from rockfall hazard probability and it will cause people and economic losses. And an example for Caidigou perilous rock Wanzhou is analyzed by using the method.The main results in this paper are as follows:(1) Through different shapes, different quality rockfall model experiments on different slope shape, different slope surface slopes showed that the horizontal movement distance of rockfall in the other conditions are the same increased with the initial velocity increasing; except cuboid rockfall,the horizontal movement distance of the other shape rockfall on the above steep below slow slope is the maximum, the second is on the step slope, and the minimum is on the above slow below steep slope; setting buffer layer on the steps of step slope can reduce the horizontal movement distance of rockfall; the motor ability of different shapes rockfall is sphere is greater than cylindrical than spherical square,and the cuboid is the minimum; the horizontal movement distance of cube and sphere rockfall increased with the mass increasing. In the case of Offset Ratio, there are no obvious rules to follow, but its value is all in the 0.5 range, in the 0.4 range is 96.7%, in the 0.3 range is 89.3%, within the 0.2 and accounted for 72.2% and 38.9% in the 0.1 range.(2) Based on comprehensive analysis existing qualitative and quantitative method to assessment the possibility of perilous rock instability and it arrival endangering area, change these qualitative and quantitative description to the possibility of perilous rock instability and it arrival endangering area, and a quantitative computational method is introduced.(3) According to the hazard characteristics of single perilous rock, combined with endangering area forecasting of single perilous rock, analysis of the vulnerability of disaster bodies, raised the death and economic loss from the two sides after the avalanche hazard evaluation of single boulders the seriousness of the consequences of the method.(4) Based on acceptable risk of the dam and landslide risk management at home and abroad, combined with rockfall hazard's characteristics,gives recommended values of risk of economic and life. (5) Tkae Caidigou perilous rock Wanzhou Chongqing city for example, research into how to use this method, solve practical engineering rockfall hazard assessment and control of decision-making.