强震条件下谢家店滑坡碎屑流发生机制试验研究

An experimental study of the initiation mechanism of landslide debris flow under a strong earthquake

摘要: 谢家店滑坡是5.12汶川大地震触发的较为典型的高速远程滑坡之一。通过滑坡岩体碎屑动荷载力学试验以及微结构特征分析,初步探讨了强震条件下滑坡碎屑流发生的动力学机制。结果表明:红色正长花岗岩的空隙和裂隙的发育程度均高于黑褐色砂岩;随着应变速率的增加,两种岩石的抗剪强度都有相应增加的趋势,且黑褐色砂岩的强度高于红色正长花岗岩;在加载速率持续增长的情况下,两种试样抗剪断强度拟合直线斜率相同,故强度增长速率相等;汶川地震使两种岩石均达到了其抗剪强度,所以岩体的剪切破坏是导致该滑坡发生的主要原因之一。

Abstract: The Xiejiadian landslide,a typical landslide located in Longmen County,was triggered by the 2008 Wenchuan earthquake with high speed and long run-out.A preliminary study of the dynamic mechanics of landslide debris under strong earthquake by landslide debris rock dynamic load mechanics tests and analyses of micro-structural features were carried out.The results show that the red syenogranite is a long gap and the degree of development of fractures in the rock is higher than that in the black-bro...