重庆甑子岩崩塌落石动力学特征及危险性分区

针对重庆市南川区甑子岩危岩体面临的崩塌地质灾害问题,分析不同高度、不同规模的危岩体对东侧居民区的落石风险及危害性。以甑子岩处岩质边坡为研究对象,根据其结构面发育情况及崩塌落石特征确定模型尺寸,运用RocFall软件对崩塌落石的能量、速度、运动轨迹、落点位置及冲击力等进行模拟计算。以此对崩塌落石区进行落石风险评估,根据崩塌落石的动量和动能,按最危险原则法将崩塌落石的危险性分区,分为Ⅰ危险性极大、Ⅱ危险性大、Ⅲ危险性一般、Ⅳ危险性较小、Ⅴ无危险五个分区,并将此分区应用于甑子岩危岩体,评价崩子岩危岩体居民区的落石风险及危险性,确保居民安全。通过对崩塌落石区的危险性分区,可以用来指导居民区的安置和防护措施。

Dynamics and hazard zoning of collapse and rockfall in Zengziyan,Chongqing

In view of the collapse geological hazard in southern Chongqing,the risk and harmfulness of dangerous rock mass with varies scales at different heights at the eastern residential area were analyzed. Taking the rock slope of Zengziyan as the case study,according to the development of the structural plane and the characteristics of the rockfall,the model size is determined,and the energy,velocity,trajectory,position and impact force of the rockfall are simulated by the Rocfall software,which is used to evaluate the risk of rockfall and to divide the risk degree. According to the study,the risk degree of rockfall can be divieded into five classes,that are class Ⅰ extremely danger,class Ⅱ great danger,class Ⅲ danger,class Ⅳ less danger and class Ⅴ safe. And the result is applied to evaluate the risk of residential area of Zengziya. The research result can be used to guide the protective of the residential area.