中巴公路陡崖块状危岩群体崩塌前兆特征

为把握中巴公路边常见的陡崖块状危岩群体特征,通过对原有的振动台进行适当的改装,开展了地震作用下陡崖块状危岩破坏模型试验研究,以模型试验重点研究陡崖块状危岩节理倾角、危岩块度、危岩群体高度及地震强度等因素对破坏的影响。结果表明:节理倾角越大,危岩体越不稳,90°特殊垂直节理倾角表现得非常脆弱不稳,崩塌一般发生在危岩体1/3高度之上,之下几乎不发生崩塌;节理倾倒角从90°减到70°时使群体破坏模式从群体崩塌转为群体滑动破坏模式,更像是岩质边坡滑动加滚动破坏。可见以上因素对该区域危岩体崩塌起决定性作用并且具有一定的规律性前兆。

Research on the cliffy lumpy?perilous rocks`s precursory characteristics of Karakorum Highway

Aiming at the common cliffy lumpy?perilous rocks`s characteristics of Karakorum Highway,experimental research was carried out on the destruction of cliffy perilous rocks under the action of earthquake by refitting the original vibration table.The research focused?on lumpiness,height,joint angle and external vibration strength of the cliffy perilous rocks and the conclusion is as follows:The bigger the joint angle, the more unstable the rock body is,the 90° special vertical joint angle is extrenmely unstable,the collapse always happen above 1/3 height,almost no collapse under it,the change of joint angle from 90° to 70° brings the change of collapse model from group collapse to group sliding collapse,which is more like rock slope sliding and rolling failure.