The Application And Research Of Flexible Protection Technology In The Rock Slope Collapse And Rockfall Hazard Management Project

The rockfall has become the most important problem in some high-steep rock slope engineering. Taking the rockfall at xiangshan geological disaster management project as an example,the influence factors of rockfall,the rockfall movement track,and the interaction mechanism between the rockfall and the slope are analyzed. An orthogonal experiment based back-analysis confirmed that the normal and tangential restitution coefficients of the rockfall are the main factors affecting the maximum horizontal displacement of the rockfall,and the parameter for the rockfall analysis is determined. At the same time,the probability method is used to predicate the slope where the situ test taken induced rockfall, and the strength and geometry parameters of barriers are designed according to the spatial and kinetic distribution of the rockfall.Rock fragmentation is frequently observed during rockfall events and several authors have raised issues related to the impact of fragments on the protection structure. However, this phenomenon is not accounted for when designing the protection barriers. The paper presents the results of 20 rockfall tests to provide new insight into the fragmentation phenomenon, especially in the case of foliated materials. The results have shown that the impacting angle plays a key role in the fragmentation of foliated rocks whereas the effect of the impacting energy tends to be of second order. No threshold in impacting energy could be defined to explain what triggers the fragmentation. It has been noticed that the proportion of impacting energy dissipated during fragmentation is relatively constant and depends on the choice of the normal restitution coefficient.