陡崖块状危岩崩塌破坏时间的地震模型试验

Earthquake model test on collapse time of cliff massive dangerous rock

危岩失稳崩塌是地震诱发的最严重的地质灾害之一,将造成巨大的灾害且难以预警。通过振动台模拟不同类型的地震荷载作用下块状危岩的失稳破坏,研究陡崖危岩体的破坏性质。利用高速摄影机记录危岩群发生失稳的过程,研究失稳破坏模式,发现危岩群的潜在破坏性。采用控制变量法比对各组试验数据,分析危岩块底边长、高宽比、节理倾角3个因素在不同地震荷载作用下对危岩群失稳破坏时间的影响。针对危岩群崩塌破坏时间的试验研究,以期实现对崩塌灾害进行评估、控制和采取应急措施的目的。

Unstable rock mass collapse is one of the most serious types of geological disaster induced by earthquakes.It is unpredictable to prevent and will cause tremendous catastrophes.To simulate the failure of massive rock masses under earthquakes with a vibration table and to deeply probe into the failure nature of potential unstable rock masses in the steep cliff,experiments were conducted.With the use of a high-speed camera,the process of failure was recorded in order to study instability modes and potential damage in rock masses.Under different earthquake loads,the influence of three factors on the failure time of unstable rock mass was analyzed by controlling variables and comparing the data recorded in each group.In the light of the experiments on the failure time of unstable rock masses,it was expected to realize the purpose of evaluating,controlling collapse disasters and taking emergent measures.