| 引用本文: | 王塞,邓建辉,陈菲,高云建,姚依凡.“10·10”西藏白格滑坡运动特征反演分析[J].哈尔滨工业大学学报,2022,54(2):162.DOI:10.11918/202009039 |
| WANG Sai,DENG Jianhui,CHEN Fei,GAO Yunjian,YAO Yifan.Inverse analysis on motion characteristics of "10·10" Baige landslide in Tibet[J].Journal of Harbin Institute of Technology,2022,54(2):162.DOI:10.11918/202009039 |
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| “10·10”西藏白格滑坡运动特征反演分析 |
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王塞1,邓建辉1,陈菲2,3,高云建1,姚依凡1
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(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)
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| 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H1 67.0 m/s、H2 73.0 m/s、H3 73.7 m/s、H4 73.2 m/s、H5 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1010.8J,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。 |
| 关键词: 白格滑坡 滑速 冲起高度 运动特性 能量 |
| DOI：10.11918/202009039 |
| 分类号:P694 |
| 文献标识码:A |
| 基金项目:国家重点研发计划项目(2018YFC1505006-03) |
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| Inverse analysis on motion characteristics of "10·10" Baige landslide in Tibet |
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WANG Sai1,DENG Jianhui1,CHEN Fei2,3,GAO Yunjian1,YAO Yifan1
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(1.State Key Laboratory of Hydraulics and Mountain River Engineering (Sichuan University), Chengdu 610065, China; 2.School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China; 3College of Architecture and Environment, Sichuan University, Chengdu 610042, China)
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| Abstract: |
| 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 H1 67.0 m/s, H2 73.0 m/s, H3 73.7 m/s, H4 73.2 m/s, and H5 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 1010.8 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. |
| Key words: Baige landslide sliding speed flushing height motion characteristics energy |
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