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含构造节理的崩塌体动力破碎特征分析

臧佳园 常文斌 邢爱国 张耀明 王春玲 金凯平 沈凌铠 于文罡

臧佳园,常文斌,邢爱国,等. 含构造节理的崩塌体动力破碎特征分析[J]. 中国地质灾害与防治学报,2023,34(0): 1-11 doi: 10.16031/j.cnki.issn.1003-8035.202209035
引用本文: 臧佳园,常文斌,邢爱国,等. 含构造节理的崩塌体动力破碎特征分析[J]. 中国地质灾害与防治学报,2023,34(0): 1-11 doi: 10.16031/j.cnki.issn.1003-8035.202209035
ZANG Jiayuan,CHANG Wenbin,XING Aiguo,et al. Analysis of dynamic fragmentation characteristics of rock avalanche with tectonic joints[J]. The Chinese Journal of Geological Hazard and Control,2023,34(0): 1-11 doi: 10.16031/j.cnki.issn.1003-8035.202209035
Citation: ZANG Jiayuan,CHANG Wenbin,XING Aiguo,et al. Analysis of dynamic fragmentation characteristics of rock avalanche with tectonic joints[J]. The Chinese Journal of Geological Hazard and Control,2023,34(0): 1-11 doi: 10.16031/j.cnki.issn.1003-8035.202209035

含构造节理的崩塌体动力破碎特征分析

doi: 10.16031/j.cnki.issn.1003-8035.202209035
基金项目: 国家重点研发计划课题(2018YFC1504804);国家自然科学基金(41530639)
详细信息
    作者简介:

    臧佳园(1996-),男,江苏常州人,土木水利专业,硕士,主要从事地质灾害研究。E-mail:shangdengweifengzjy@sjtu.edu.cn

    通讯作者:

    常文斌(1995-),男,山西运城人,土木工程专业,博士,主要从事工程地质和地质灾害等研究。Email:changwenbin@sjtu.edu.cn

  • 中图分类号: P642.21

Analysis of dynamic fragmentation characteristics of rock avalanche with tectonic joints

  • 摘要: 近年来西南地区崩塌灾害频发,严重影响区域生态环境和人类活动。为明确崩塌体运动过程中的破碎特征,基于对纳雍县鬃岭崩塌的野外地质勘察,使用离散元颗粒流方法模拟了鬃岭崩塌在破坏及堆积阶段的动力破碎过程,并对崩塌体中破碎体的最大弗雷特直径(Feret’s diameter)分布特征进行统计分析。结果表明:1. 重力作用下鬃岭崩塌内部构造节理迅速贯通,将崩塌体分割为大量破碎块体,最终沿顺倾节理面滑下。2. 在崩塌前期破坏及后续堆积过程中均存在明显的破碎现象,具体表现为初始破坏时的大范围解体与后续堆积过程中的摩擦拉裂破碎。3. 采用双参数Weibull分布模型及分形几何理论拟合了不同时刻破碎体粒径分布曲线,结果显示崩塌体在堆积阶段(t = 21.7~72.4 s)的破碎程度弱于前期破坏阶段(t = 0~21.7 s)的破碎程度,破碎体的分形维数及细粒径破碎体的占比在整个运动过程中不断增大,再次论证了崩塌体破坏及堆积全过程中的破碎解体现象。研究结果为揭示鬃岭崩塌的动力破碎机理提供了理论依据,为西南山区崩塌灾害的防治提供了科学指导。
  • 图  1  纳雍县鬃岭崩塌

    Figure  1.  Aerial view of the Zongling rock avalanche: (a) satellite photograph of the rock avalanche in Zongling Town, Nayong County; (b) stratum lithology in the Zongling avalanche area; (c) photo of the avalanches from the panoramic view[19]

    图  2  鬃岭崩塌工程地质剖面图

    1—碎石土;2—粉砂岩;3—灰岩;4—泥岩;5—泥质粉砂岩;6—燧石灰岩;7—节理裂隙;8—飞仙关组;9—长兴-大隆组;10—龙潭组;11—第四系

    Figure  2.  Engineering geological cross-section of the Zongling rock avalanche

    图  3  合成岩石试样(SMRS)的单轴压缩试验应力-应变曲线

    Figure  3.  Stress-strain curve of synthetic rock mass specimen (SMRS) under unconfined compression test

    图  4  鬃岭崩塌PFC2D模型

    Figure  4.  A two-dimensional numerical model of the Zongling rock avalanche

    图  5  崩塌体的破坏过程

    Figure  5.  Failure process of the Zongling rock avalanche

    图  6  崩塌体的堆积过程

    Figure  6.  Accumulation process of the Zongling rock avalanche

    图  7  鬃岭崩塌现场破碎体

    Figure  7.  The fragments at the Zongling rock avalanche site

    图  8  破碎体的最大弗雷特直径

    Figure  8.  Maximum Feret's diameter of fragments

    图  9  破碎体粒径-累计体积分数分布曲线

    Figure  9.  Particle size of feret’s diameter-cumulative volume fraction distribution curve of fragments

    图  10  破碎体粒径-数目级配曲线

    Figure  10.  Particle size of feret's diameter-number size distribution curve of fragments

    表  1  合成岩石试样(SRMS)微观参数

    Table  1.   Micromechanical parameters of synthetic rock mass specimen(SMRS)

    关键参数名称参数值
    颗粒密度 ρ/(kg/m32 200
    颗粒粒径R/(m)0.002-0.003
    颗粒有效模量emod/(N/m27e9
    刚度比kratio1.5
    胶结有效模量pb_emod/(N/m21.21e10
    胶结刚度比pb_kratio1.5
    胶结抗拉强度pb_ten/(N/m28.1e8
    胶结粘聚力pb_coh/(N/m24.6e8
    胶结内摩擦角pb_fa/(degree)39.8
    下载: 导出CSV
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  • 收稿日期:  2022-09-24
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