金沙江“10·11”白格特大型滑坡形成机制及发展趋势初步分析

冯文凯 张国强 白慧林 周玉龙 许强 郑光

冯文凯, 张国强, 白慧林, 周玉龙, 许强, 郑光. 2019: 金沙江“10·11”白格特大型滑坡形成机制及发展趋势初步分析. 工程地质学报, 27(2): 415-425. doi: 10.13544/j.cnki.jeg.2018-392
引用本文: 冯文凯, 张国强, 白慧林, 周玉龙, 许强, 郑光. 2019: 金沙江“10·11”白格特大型滑坡形成机制及发展趋势初步分析. 工程地质学报, 27(2): 415-425. doi: 10.13544/j.cnki.jeg.2018-392
FENG Wenkai, ZHANG Guoqiang, BAI Huilin, ZHOU Yulong, XU Qiang, ZHENG Guang. 2019: A PRELIMINARY ANALYSIS OF THE FORMATION MECHANISM AND DEVELOPMENT TENDENCY OF THE HUGE BAIGE LANDSLIDE IN JINSHA RIVER ON OCTOBER 11, 2018. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 415-425. doi: 10.13544/j.cnki.jeg.2018-392
Citation: FENG Wenkai, ZHANG Guoqiang, BAI Huilin, ZHOU Yulong, XU Qiang, ZHENG Guang. 2019: A PRELIMINARY ANALYSIS OF THE FORMATION MECHANISM AND DEVELOPMENT TENDENCY OF THE HUGE BAIGE LANDSLIDE IN JINSHA RIVER ON OCTOBER 11, 2018. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 415-425. doi: 10.13544/j.cnki.jeg.2018-392

金沙江“10·11”白格特大型滑坡形成机制及发展趋势初步分析

doi: 10.13544/j.cnki.jeg.2018-392
基金项目: 

地质灾害防治与地质环境保护国家重点实验室团队项目 SKLGP2016Z001

国家自然科学基金 41572291

四川省青年科技创新研究团队专项计划项目 2017TD0018

详细信息
    作者简介:

    冯文凯(1974-), 男, 博士, 教授, 博士生导师, 主要从事区域稳定及与岩体稳定以及地质灾害评价与防治方面的教学与研究工作.Email:fwkhyl@163.com

  • 中图分类号: P642.22

A PRELIMINARY ANALYSIS OF THE FORMATION MECHANISM AND DEVELOPMENT TENDENCY OF THE HUGE BAIGE LANDSLIDE IN JINSHA RIVER ON OCTOBER 11, 2018

Funds: 

the Team Project of Independent Research of SKLGP SKLGP2016Z001

the National Natural Science Foundation of China 41572291

the Sichuan Provincial Youth Science and Technology Innovation Team Special Projects of China 2017TD0018

  • 摘要: 2018年10月11日,西藏昌都市江达县波罗乡白格村发生大规模滑坡,约有3165×104 m3的山体高速冲入金沙江形成堰塞坝,13日9时堰塞坝体被自然泄流冲开,堰塞湖威胁解除。11月3日,在时隔短短23 d后,该滑坡后缘约215×104 m3高位滑体再次发生滑动破坏,高速运动的滑体沿途铲刮坡体并冲入金沙江,再次形成堰塞坝。现场调查研究得出白格滑坡主要是受其后缘逆冲分支断层f2(不整合接触面)控制,并在长期重力卸荷、降雨和地下水的反复浸润作用影响下,最终整体失稳破坏。通过对滑坡演化过程分析得出,其变形破坏过程可分为5个阶段,即:后缘蠕滑和沉降下错阶段(Ⅰ)、坡体裂缝发展、贯通阶段(Ⅱ)、整体启动"锁固端"剪断阶段(Ⅲ)、高速凌空滑跃阶段(Ⅳ)、碰撞、破碎、堆积成坝阶段(Ⅴ)。一期变形破坏机制模式可归结为蠕滑-下错-剪断-滑跃式,破坏方式表现为推移式,后期临空条件较好,破坏将以牵引式为主。在此基础上,结合残留强变形区块(K1、K2、K3)及其周边影响区形貌特征和变形迹象,对其变形破坏特征和发展趋势进行了预测分析,认为后期强变形区总体将以渐进解体方式破坏为主。
  • 图  1  滑坡区构造纲要图

    Figure  1.  The structure outline map of landslide-hit areas

    图  2  滑坡区工程地质平面图

    Figure  2.  The geological plan of projects in landslide-hit areas

    图  3  原始斜坡结构剖面图(剖面1-1′)

    Figure  3.  The structure profile of the original slope(profile: 1-1′)

    图  4  2016~2018年滑坡附近县降雨量特征

    Figure  4.  The feature of rainfall in counties near landslide-hit areas from 2016 to 2018

    图  5  第1时段、第2时段滑坡整体特征

    Figure  5.  The overall feature of the landslide in the first and second period

    图  6  第3、4、5时段滑坡整体特征

    Figure  6.  The overall feature of the landslide in the third-fourth-fifth period

    图  7  滑坡强变形区特征

    Figure  7.  The feature of highly deformed landslide-hit areas

    图  8  滑坡变形演化过程模式图

    a.原始斜坡结构;b.后缘沉降下错阶段;c.坡体裂缝发展、贯通阶段;d.整体启动、锁固段剪断;e.高速临空滑跃阶段;f.碰撞、破碎、堆积成坝阶段

    Figure  8.  The mode pattern of evolution process of the landslide deformation

    图  9  滑坡强变形区边坡雷达观察点布置图

    Figure  9.  Layout chart of slope radar in strong deformed area of landslide

    图  10  K1强变形区位移监测情况

    Figure  10.  Monitoring of displacement in K1 deformation zone

    图  11  K2强变形区位移监测情况

    Figure  11.  Monitoring of displacement in K2 deformation zone

    图  12  K3强变形区位移监测情况

    Figure  12.  Monitoring of displacement in K3 deformation zone

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出版历程
  • 收稿日期:  2018-11-29
  • 修回日期:  2019-01-23
  • 刊出日期:  2019-04-25

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