“10·10”西藏白格滑坡运动特征反演分析  

Inverse analysis on motion characteristics of"10·10"Baige landslide in Tibet

作　　者：王塞 邓建辉[1] 陈菲 高云建 姚依凡 WANG Sai;DENG Jianhui;CHEN Fei;GAO Yunjian;YAO Yifan(State Key Laboratory of Hydraulics and Mountain River Engineering(Sichuan University),Chengdu 610065,China;School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China;College of Architecture and Environment,Sichuan University,Chengdu 610042,China)

机构地区：[1]水力学与山区河流开发保护国家重点实验室(四川大学),成都610065 [2]成都大学建筑与土木工程学院,成都610106 [3]四川大学建筑与环境学院,成都610042

出　　处：《哈尔滨工业大学学报》2022年第2期162-170,共9页Journal of Harbin Institute of Technology

基　　金：国家重点研发计划项目(2018YFC1505006-03)。

摘　　要：为获取“10·10”白格滑坡运动规律与特征,基于“10·10”白格滑坡发育的3大区(启动区、堆积区、冲击区)和6个运动阶段(主体失稳破坏、牵引区启动、高速临空滑跃、冲击对岸、折返相撞及水砂射流、堆积坝次级滑移),对滑坡碎屑体堆积状态及其在四川岸的冲击形态进行分析。采用谢徳格尔法及能量转化计算方法,选取滑坡体冲击高度的5个特征点,计算滑坡碎屑体在各运动阶段的运动速度。结果表明:主滑区阻滑区滑体以2.2 m/s的初速度启动,从启动区至剪出口,速度不断增大,5个特征点达到最大速度,分别为H_(1)67.0 m/s、H_(2)73.0 m/s、H_(3)73.7 m/s、H_(4)73.2 m/s、H_(5)68.3 m/s;牵引区滑体到达剪出口时,速度为70.2 m/s;主滑区阻滑区滑体的滑动速度具有从中间向两端递减的态势,其中滑坡主滑方向的中间位置速度最高,达73.7 m/s;滑体整体剧动时所释放的能量E至少为10^(10.8)J,引起震动相当于4.0~4.7级的表层基岩地震。通过滑坡冲击地貌参数反演“10·10”白格滑坡运动特征,将有助于加深对白格滑坡动力学机制的认识,为该类高速岩质滑坡的预测和防治提供理论依据。In order to obtain the movement law and characteristics of the"10·10"Baige landslide,based on the three zones(initiation zone,accumulation zone,and impact zone)and six stages of motion(instability and failure of the main body,initiation of traction zone,high-speeding slide in the air,impact on the opposite shore,turn-backing collision and jet of water and sand,and secondary slip of the pileup dam)of the Baige landslide,the accumulation state of landslide debris body and its impact shape in the other side of the river(in Sichuan Province)were analyzed.Adopting the calculation method proposed by Sheidegger and the energy transformation calculation method,five characteristic points considering impact height were selected to calculate the velocity of landslide debris body during each motion stage.Results show that the landslide initiated with a velocity of 2.2 m/s,and the velocity of the landslide body increased constantly from the initiation zone to the shear outlet.The maximum velocities of the five characteristic points were H_(1)67.0 m/s,H_(2)73.0 m/s,H_(3)73.7 m/s,H_(4)73.2 m/s,and H_(5)68.3 m/s,respectively.When the sliding body in the traction zone reached the shear outlet,the velocity was 70.2 m/s.The velocities in main slide zone and resistance zone gradually decreased from the middle to both ends,and the velocity was the highest in the main sliding direction of the landslide,up to 73.7 m/s.The energy released at least 10^(10.8)J when the whole sliding body moved,causing vibration equivalent to the surface bedrock earthquakes of 4.0 to 4.7 magnitudes.The study of the motion characteristics of"10·10"Baige landslide on the basis of the geomorphic features of landslide impact will deepen the understanding of the kinetic mechanism of Baige landslide and provide reference for the prediction,mitigation,and prevention of similar geohazards.

关 键 词：白格滑坡 滑速 冲起高度 运动特性 能量 

分 类 号：P694[天文地球—地质学]