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四川宝兴张家沟危岩体稳定性及运动学分析

陈锡锐 刘虹强 杨剑红 艾其凯 钟波 蔡国军

陈锡锐,刘虹强,杨剑红,等. 四川宝兴张家沟危岩体稳定性及运动学分析[J]. 中国地质灾害与防治学报,2023,34(0): 1-9 doi: 10.16031/j.cnki.issn.1003-8035.202209043
引用本文: 陈锡锐,刘虹强,杨剑红,等. 四川宝兴张家沟危岩体稳定性及运动学分析[J]. 中国地质灾害与防治学报,2023,34(0): 1-9 doi: 10.16031/j.cnki.issn.1003-8035.202209043
CHEN Xirui,LIU Hongqiang,YANG Jianhong,et al. Analysis of stability and kinematics of the dangerous rock mass in Zhangjiagou, Baoxing, Sichuan Province[J]. The Chinese Journal of Geological Hazard and Control,2023,34(0): 1-9 doi: 10.16031/j.cnki.issn.1003-8035.202209043
Citation: CHEN Xirui,LIU Hongqiang,YANG Jianhong,et al. Analysis of stability and kinematics of the dangerous rock mass in Zhangjiagou, Baoxing, Sichuan Province[J]. The Chinese Journal of Geological Hazard and Control,2023,34(0): 1-9 doi: 10.16031/j.cnki.issn.1003-8035.202209043

四川宝兴张家沟危岩体稳定性及运动学分析

doi: 10.16031/j.cnki.issn.1003-8035.202209043
基金项目: 国家重点实验室自主课题(SKLGP2019Z017)、四川省科技计划(No.2019YJ0403)
详细信息
    作者简介:

    陈锡锐(1997-),男,助理工程师,硕士,主要从事地质工程与岩土工程方面研究工作。E-mail:719039252@qq.com

    通讯作者:

    刘虹强(1983-),男,高级工程师,硕士,主要从事水工环相关研究。E-mail:93053219@qq.com

  • 中图分类号: P462.22

Analysis of stability and kinematics of the dangerous rock mass in Zhangjiagou, Baoxing, Sichuan Province

  • 摘要: 张家沟危岩体于“6·1”芦山地震后被发现,稳定性差,严重威胁下方居民生命财产安全。基于稳定性计算及离散元数值分析方法对危岩体进行评价,选取稳定性最差的地震工况进行运动学分析,在上述研究基础上结合解析解与数值解成果设计相应防护措施。主要结论有:(1)张家沟危岩体结构破碎,发育顺坡向控制性结构面,破坏模式为滑移式;(2)稳定性计算与数值模拟结果皆表明张家沟危岩体在天然、暴雨、地震工况下均会失稳,其中地震工况下运动距离最长;(3)地震工况下危岩体的破坏模式为震裂—滑移式,运动过程中块石以滑移为主,跳高较小,同时坡面形态显著影响着落石运动特征;(4)落石间相互碰撞挤压会改变其运动特征及冲击动能大小,在一定程度上可增加其致灾范围。成果可为类似灾害防治提供参考。
  • 图  1  张家沟危岩体全貌图

    Figure  1.  Overview map of the Zhangjiagou dangerous rock mass

    图  2  张家沟危岩体剖面图

    Figure  2.  Cross-sectional diagram of the Zhangjiagou dangerous rock mass

    图  3  斜坡前部东河

    Figure  3.  Aerial view of the East River area at the front of the slope

    图  4  危岩体赤平投影

    Figure  4.  Stereographic projection of the Zhangjiagou dangerous rock mass

    图  5  张家沟危岩体数值计算模型

    Figure  5.  Numerical calculation model of the Zhangjiagou dangerous rock mass

    图  6  三种工况下危岩体总位移云图

    Figure  6.  Total displacement nephogram of the dangerous rock mass under three working conditions

    图  7  地震工况下张家沟危岩体运动特征

    Figure  7.  Movement characteristics of the Zhangjiagou dangerous rock mass under seismic working condition

    图  8  监测点水平与竖直位移曲线

    Figure  8.  Horizontal and vertical displacement curves of the monitoring points

    图  9  监测点速度与水平位移曲线图

    Figure  9.  Monitoring point velocity and horizontal displacement curve

    图  10  落石冲击动能与水平位移关系曲线

    Figure  10.  Relationship curve between the kinetic energy of rockfall impact and horizontal displacement

    图  11  既有拦石墙被摧毁

    Figure  11.  Site photo of destroyed existing barricade wall

    图  12  拦石墙拦挡效果模拟

    Figure  12.  Simulation of the blocking effect of the rockfall protection retaining wall

    表  1  岩体力学基本参数取值(天然)

    Table  1.   Fundamental mechanical parameters of rock mass (natural)

    岩性密度/(kg/m3节理刚度/(MPa)内摩擦角/(°)粘聚力/(MPa)
    花岗岩275047.511.2
    基岩296058.215.7
    L12.230.50.8
    L22.224.90.6
    L32.225.30.7
    下载: 导出CSV

    表  2  稳定性计算参数选取

    Table  2.   Selection of calculation parameters for stability analysis

    计算
    工况
    重度
    (Kn/m3
    后缘陡倾裂隙
    深度h(m)
    裂隙或滑面充水
    高度hw(m)
    滑面长度
    l(m)
    裂隙水压力
    V(Kn/m)
    软弱结构面
    倾角$ \theta $ ( °)
    地震水平
    系数ζe
    结构面综合
    粘聚力$ c $ (Mpa)
    结构面综合
    内摩擦角(°)
    天然26.956.681.9625.3219.24500.6531
    暴雨27.456.682.2525.3225.34500.6127
    地震26.956.681.9625.3219.2450.160.6531
    下载: 导出CSV

    表  3  稳定性计算结果

    Table  3.   Stability analysis calculation results

    计算工况破坏模式稳定性系数k稳定状态
    天然滑移式1.18欠稳定
    暴雨滑移式1.00欠稳定
    地震滑移式0.93欠稳定
    下载: 导出CSV
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  • 收稿日期:  2022-09-27
  • 录用日期:  2023-04-21
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