青藏高原东端甘肃舟曲牙豁口滑坡复活机理研究

为深入研究青藏高原古滑坡复活机理,以甘肃舟曲县东山镇牙豁口滑坡为对象,通过对INSAR监测数据和现场地表监测数据的深入分析,探讨了舟曲县东山镇牙豁口滑坡的滑动变形阶段,并揭示其复活驱动机理。鉴于牙豁口滑坡最先启动块体高陡的后壁和侧壁失稳下滑形态可知,降雨可能只是一个诱发因子,真正触发牙豁口滑坡复活的根本原因是滑坡后缘岩土体的崩落和坪定-化马断裂带错动的影响。根据现场调查显示,目前牙豁口滑坡HI1后壁的稳定性依然较差,存在多个潜在变形区,一旦这些潜在变形体发生崩塌破坏,必然造成牙豁口滑坡的再次复活,并形成堰塞湖。通过对牙豁口滑坡复活的现场勘查与触发因子分析,为今后该区滑坡灾害的防治减灾提供必要的借鉴和依据,也对古滑坡复活机理研究提供了新的参考。

The Reactivation Mechanism of Yahuokou Landslide at the Eastern End of Qinghai-Tibet Plateau,Zhouqu County,Gansu Province,China

In order to study the mechanism of the resurrection of ancient landslides on the Qinghai-Tibet Plateau,we take the Yahuokou Landslide in Dongshan Township,Zhouqu County as the object.Through in-depth analysis of the INSAR monitoring data and field surface monitoring data,the sliding deformation of the Yahuokou landslide is discussed,and its reactivation driving mechanism is revealed.In view of the instability and sliding morphology of the trailing and both sides of broken walls of Yahuokou Landslide,it can be known that rainfall may be only an inducing factor.The fundamental reason for the revival of Yahuokou Landslide is the collapse of rock and soil mass at the back edge of the landslide and the activities of Pingding-Huama Fault Zone.According to the field investigation,the stability of back wall of HI1 slope is still poor,and there are many potential landslides.Once these landslides collapse,it will inevitably lead to the revival of Yahuokou Landslide and the formation of barrier lake.Through the field investigation and trigger factor analysis of Yahuokou Landslide,it provides a new reference for the prevention and mitigation of landslide disasters in this area and the study of the reactivation mechanism of ancient landslides.