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基于滑面分区段力学模型的高速滑坡运动过程能量转化研究

刘艺梁 陈健翔 高晨曦 宋琨 唐玄

刘艺梁, 陈健翔, 高晨曦, 宋琨, 唐玄. 基于滑面分区段力学模型的高速滑坡运动过程能量转化研究[J]. 地质科技通报, 2022, 41(2): 139-146. doi: 10.19509/j.cnki.dzkq.2022.0061
引用本文: 刘艺梁, 陈健翔, 高晨曦, 宋琨, 唐玄. 基于滑面分区段力学模型的高速滑坡运动过程能量转化研究[J]. 地质科技通报, 2022, 41(2): 139-146. doi: 10.19509/j.cnki.dzkq.2022.0061
Liu Yiliang, Chen Jianxiang, Gao Chenxi, Song Kun, Tang Xuan. Energy conversion of the high-speed landslide movement process based on a sliding surface partition mechanical model[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 139-146. doi: 10.19509/j.cnki.dzkq.2022.0061
Citation: Liu Yiliang, Chen Jianxiang, Gao Chenxi, Song Kun, Tang Xuan. Energy conversion of the high-speed landslide movement process based on a sliding surface partition mechanical model[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 139-146. doi: 10.19509/j.cnki.dzkq.2022.0061

基于滑面分区段力学模型的高速滑坡运动过程能量转化研究

doi: 10.19509/j.cnki.dzkq.2022.0061
基金项目: 

国家自然科学基金项目 41807294

湖北省自然科学基金项目 2018CFB400

防灾减灾湖北省重点实验室开放基金项目 2017KJZ04

详细信息
    作者简介:

    刘艺梁(1985—),男,讲师,主要从事滑坡灾害致灾机理与防治研究。E-mail:lyl@ctgu.edu.cn

    通讯作者:

    陈健翔(1997—),男,现正攻读地质资源与地质工程专业硕士学位,主要从事滑坡运动致灾机理研究。E-mail:2419457681@qq.com

  • 中图分类号: P642.22

Energy conversion of the high-speed landslide movement process based on a sliding surface partition mechanical model

  • 摘要: 高速滑坡具有运动速度快、波及范围广的灾害特征, 因此对滑坡启动、加速和静止整个运动过程进行研究很有必要。基于滑面力学特性将滑面分为弹性介质区和应变弱化区, 构建了高速滑坡二维力学模型, 提出了滑坡启动动能计算公式和滑坡运动过程的能量计算公式; 以千将坪滑坡为例, 采用启动动能计算公式得出滑坡的启动速度为2.35 m/s; 依据滑面形态将其运动轨迹划分为快速加速、平稳加速、平稳减速、急剧减速4个阶段, 进行运动过程分析, 得出滑坡最大速度为16.8 m/s, 以滑坡前缘高程所在平面为势能基准面, 分析不同能量与总能量占比的变化情况, 在滑坡的4个运动阶段中, 动能占比分别为9.1%, 25.6%, 15.1%, 0%;摩擦损耗能量占比分别为: 5.5%, 58.8%, 81.7%, 95.5%;势能占比分别为: 85.2%, 14.2%, 0%, 0%;其他阻力能耗占比分别为: 0.2%, 1.4%, 3.2%, 4.5%。研究结论对高速滑坡致灾机制和风险分析具有重要意义。

     

  • 图 1  二维滑坡力学模型图

    Figure 1.  2D mechanical model of reservoir landslide

    图 2  千将坪滑坡全貌

    Figure 2.  Overview of Qianjiangping landslide

    图 3  千将坪滑坡滑动后2-2′工程地质剖面图

    Qcol.崩塌堆积层;Qdel.滑坡堆积层; J1-2n.中-下侏罗统聂家山组碎屑岩

    Figure 3.  Engineering geological profile of 2-2′ section Qianjiangping landslide after sliding

    图 4  滑坡运动路径图

    l1~l4.滑坡滑面第1~4段的滑动距离;H1~H3.第1~3段高程差;β1~β4.第1~4段滑面倾角

    Figure 4.  Landslidemovement path diagram

    表  1  滑带土抗剪强度[29]

    Table  1.   Shear strength of sliding zone soil

    位置 参数 直接剪切 反复剪
    弹性介质区 c/kPa 28.3 13.8
    φ/(°) 18.2 17.6
    应变软化区 c/kPa 20.5 5.0
    φ/(°) 19.0 18.4
    下载: 导出CSV

    表  2  滑坡启动速度参数表[27]

    Table  2.   Parameters of landslide′s starting speed

    参数 量值 参数 量值
    应力软化区段长度L1/m 750 应力软化区段面积S1/m2 27 500
    弹性介质区段长度L2/m 450 弹性介质区段面积S2/m2 24 500
    滑坡岩土体天然或饱和重度γ/(MN·m-3) 0.025,0.029 后缘拉裂槽宽度lf/m 1.4
    后缘滑面倾角β/(°) 30 滑面平均倾角α0/(°) 12
    下载: 导出CSV

    表  3  千将坪滑坡运动各阶段计算结果

    Table  3.   Calculation results of Qianjiangping landslide′s different movement stages

    滑坡运动阶段 水平位移/m 瞬时速度/ (m·s-1) 瞬时势能/ 总能量/% 瞬时动能/ 总能量/% 瞬时摩擦能耗/ 总能量/% 其他阻力能耗/ 总能量/%
    阶段一 15.0 10.0 85.2 9.1 5.5 0.2
    阶段二 127.5 16.8 14.2 25.6 58.8 1.4
    阶段三 52.5 12.9 0 15.1 81.7 3.2
    阶段四 30.0 0 0 0 95.5 4.5
    下载: 导出CSV

    表  4  不同分界点高程各阶段速度对比

    Table  4.   Velocity comparison in different stages of different boundary point elevations

    分界点滑面高程/m 启动速度/ (m·s-1) 第一阶段速度/(m·s-1) 第二阶段速度/(m·s-1) 第三阶段速度/(m·s-1)
    205 0.84 8.6 14.1 11.35
    210 1.92 9.3 15.5 12.1
    215 2.35 10.0 16.8 12.9
    220 3.99 10.8 17.8 13.5
    225 4.74 11.1 18.5 14.6
    下载: 导出CSV
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