ABSTRACT
Rockfall and collapse caused a huge threat to the safe operation of the highway, especially in the deep canyon area. It is not uncommon for expressway rockfall and collapse reported at home and abroad, such as Gui-Xin expressway rockfall stabbing incident, Chu-Da highway rockfall blocking road events. At present, the collapse and rockfall mainstream algorithm is using the limit equilibrium analysis method, and this method can provide the basic design parameters for the in-line, low unstable rock and collapse treatment or design. But, for the on-line and high collapse of unstable rock, it is difficult to make a good assessment by the limit equilibrium analysis. Because of the occurred by chance and the randomness of the trajectory of rockfall, to evaluate on-line and high unstable rock by risk assessment is a better suitability method.
