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    顺层岩质滑坡渐进破坏进入加速的能量学判据

    唐朝晖 余小龙 柴波 张淑杞 孙晓鑫

    唐朝晖, 余小龙, 柴波, 张淑杞, 孙晓鑫, 2021. 顺层岩质滑坡渐进破坏进入加速的能量学判据. 地球科学, 46(11): 4033-4042. doi: 10.3799/dqkx.2019.960
    引用本文: 唐朝晖, 余小龙, 柴波, 张淑杞, 孙晓鑫, 2021. 顺层岩质滑坡渐进破坏进入加速的能量学判据. 地球科学, 46(11): 4033-4042. doi: 10.3799/dqkx.2019.960
    Tang Zhaohui, Yu Xiaolong, Chai Bo, Zhang Shuqi, Sun Xiaoxin, 2021. Energetic Criterion of Entering Acceleration in Progressive Failure Process of Bedding Rockslide: A Case Study for Shanshucao Landslide. Earth Science, 46(11): 4033-4042. doi: 10.3799/dqkx.2019.960
    Citation: Tang Zhaohui, Yu Xiaolong, Chai Bo, Zhang Shuqi, Sun Xiaoxin, 2021. Energetic Criterion of Entering Acceleration in Progressive Failure Process of Bedding Rockslide: A Case Study for Shanshucao Landslide. Earth Science, 46(11): 4033-4042. doi: 10.3799/dqkx.2019.960

    顺层岩质滑坡渐进破坏进入加速的能量学判据

    doi: 10.3799/dqkx.2019.960
    基金项目: 

    国家自然科学基金项目 41572256

    国家自然科学基金项目 41877253

    中央高校基本科研业务费专项资金资助项目 CUGL160408

    详细信息
      作者简介:

      唐朝晖(1964-), 女, 教授, 主要从事工程地质与环境岩土工程的教学科研工作.E-mail: zhtang@cug.edu.cn

      通讯作者:

      柴波, Email: chai1998@126.com

    • 中图分类号: P64

    Energetic Criterion of Entering Acceleration in Progressive Failure Process of Bedding Rockslide: A Case Study for Shanshucao Landslide

    • 摘要: 顺层岩质滑坡是最常见的斜坡灾害,研究其渐进破坏过程、建立预报判据对于防灾减灾具有重要意义.以秭归杉树槽滑坡为例,在野外调查和室内岩石试验的基础上,利用JRC-JCS模型及GSI法估算得出滑坡基本力学参数;通过FLAC3D模拟滑坡渐进破坏过程,分析顺层岩质滑坡变形破坏的发展规律;基于能量守恒和虚功原理,提出了顺层岩质滑坡迈入加速变形的能量学判据.研究表明:杉树槽滑坡由后缘向前渐进破坏,后缘变形累积的总位移值不断增大,前缘切层段的锁固作用使变形迅速降低,当临近破坏时,前缘位移由前向后发展,滑面快速贯通;滑体沿滑动方向应变曲线可近似表示为"S"型曲线,随渐进破坏该曲线向坡下发展;以滑体动能增量大于0作为滑坡迈入加速变形的能量学判据,其结果符合滑坡地质演化观点,与FLAC3D模拟结果吻合.

       

    • 图  1  杉树槽滑坡平面图

      Fig.  1.  Map of Shanshucao landslide

      图  2  钻探取心照片

      Fig.  2.  Pictures of drilling coring

      图  3  杉树槽滑坡A-A’剖面图

      Fig.  3.  Section (A-A') of Shanshucao landslide

      图  4  杉树槽滑坡渐进破坏与水力作用

      Fig.  4.  Water pressure developing with progressive failure process of Shanshucao landslide

      图  5  滑坡模型示意

      Fig.  5.  Schematic diagram of landslide model

      图  6  三轴压缩试验

      Fig.  6.  Triaxial compression test

      图  7  结构面形态及产状现场测量

      Fig.  7.  On-site measurement of structural plane shape and occurrence

      图  8  滑坡演化过程结构面塑性区发展状况

      Fig.  8.  Development situation of plastic zone of structure plane during landslide evolution process

      图  9  数值模拟不同演化阶段滑体位移及应变曲线

      Fig.  9.  Displacement and strain curves of slide mass at different evolution stages by numerical simulation

      图  10  应变渐进演化曲线模型

      Fig.  10.  Curve model for progressive evolution of strain

      图  11  位移、应变曲线推导结果与模拟结果对比(第三阶段)

      Fig.  11.  Comparison of displacement and strain curve derivation results with simulation results (third stage)

      图  12  函数H(λ)曲线图

      Fig.  12.  Diagram of H(λ)

      图  13  滑坡变形阶段及其能量判别

      Fig.  13.  Landslide energy in different evolution stages

      表  1  滑坡模拟力学参数建议

      Table  1.   Proposed mechanical parameters for landslide simulation

      位置 Ρ(kg∙m-3) K(GPa) G(GPa) $ \varphi $(°) c(Mpa)
      滑床 2 550 17.14 6.7 38 4.37
      滑体 2 550 11.08 4.25 33 4.2
      后缘 2 500 1.27 1.27 33 0.11
      后缘侧壁 2 500 1.17 1.17 33 0.23
      前缘侧壁 2 500 0.87 0.87 30 0.32
      顺层滑面 2 500 0.66 0.66 25~19 0.23~0.02
      切层滑面 2 500 0.99 0.99 30~21 0.32~0.02
      下载: 导出CSV

      表  2  滑面贯通位置与参数表征值对应表

      Table  2.   Table of correspondence between location of sliding surface failure and parameter characteristic value

      滑面贯通位置λ 0 160 260 300
      参数表征值b 90 115 135 160
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2019-12-01
    • 网络出版日期:  2021-12-04
    • 刊出日期:  2021-11-30

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