基于离散元的采空诱发山体滑塌失稳模式研究

马杰, 何开明, 常文斌, 邢爱国. 基于离散元的采空诱发山体滑塌失稳模式研究[J]. 水文地质工程地质, 2024, 51(3): 171-179. doi: 10.16030/j.cnki.issn.1000-3665.202210057
引用本文: 马杰, 何开明, 常文斌, 邢爱国. 基于离散元的采空诱发山体滑塌失稳模式研究[J]. 水文地质工程地质, 2024, 51(3): 171-179. doi: 10.16030/j.cnki.issn.1000-3665.202210057
MA Jie, HE Kaiming, CHANG Wenbin, XING Aiguo. Study on the failure pattern of mining-induced landslides based on discrete elements[J]. Hydrogeology & Engineering Geology, 2024, 51(3): 171-179. doi: 10.16030/j.cnki.issn.1000-3665.202210057
Citation: MA Jie, HE Kaiming, CHANG Wenbin, XING Aiguo. Study on the failure pattern of mining-induced landslides based on discrete elements[J]. Hydrogeology & Engineering Geology, 2024, 51(3): 171-179. doi: 10.16030/j.cnki.issn.1000-3665.202210057

基于离散元的采空诱发山体滑塌失稳模式研究

  • 基金项目: 国家重点研发计划课题(2018YFC1504804)
详细信息
    作者简介: 马杰(1988—),男,高级工程师,主要从事地下空间开发研究工作。E-mail:wanfeng1004@126.com
    通讯作者: 常文斌(1995—),男,博士研究生,主要从事滑坡灾害研究工作。E-mail:changwenbin@sjtu.edu.cn
  • 中图分类号: TU443

Study on the failure pattern of mining-induced landslides based on discrete elements

More Information
  • 采空诱发的山体崩滑是煤矿山区常见的一类灾害形式,为明确采动作用下采空山体的变形失稳模式,对典型采空控制型滑坡进行现场调查,采用颗粒离散元方法模拟单层采空与三层采空两种工况下反倾煤层斜坡的失稳破坏过程,并对斜坡变形过程中裂纹扩展及岩体破碎特征进行分析。结果表明:(1) 单层开挖工况中,煤层开挖后顶板区域会产生拱圈型的变形带并随之演化为冒落岩体,多层开挖的采空区间隔岩体则会发生弯曲状沉陷垮落,形成大面积的岩体破碎;(2)不同开挖工况下,冒落带形成及应力重分布初期,斜坡内部裂纹演化及岩体破碎皆较为缓慢,顶板冒落及岩层弯曲断裂阶段为岩体断裂破碎的关键阶段;(3) 反倾煤层采空控制型山体失稳模式主要为煤层采空-顶板拱圈状冒落-内部岩层弯曲沉陷-后缘拉裂破碎-坡脚锁固区失效-破碎岩体浅层滑动。研究结果为采空控制型斜坡失稳机理分析提供了新的方向,为矿区滑坡灾害的防治提供了科学依据。

  • 加载中
  • 图 1  马达岭滑坡滑源区

    Figure 1. 

    图 2  煤层开挖斜坡模型

    Figure 2. 

    图 3  单层开挖斜坡失稳过程

    Figure 3. 

    图 4  多层开挖斜坡失稳过程

    Figure 4. 

    图 5  岩体内部裂纹及破碎体数目

    Figure 5. 

    图 6  采空诱发型斜坡失稳模式

    Figure 6. 

    表 1  岩体强度特性

    Table 1.  Rock strength properties

    试样 弹性模量/MPa 泊松比 黏聚力/MPa 内摩擦角/(°)
    砂岩 15000 0.19 2 42
    500 0.32 0.43 36
    下载: 导出CSV

    表 2  PFC模型参数

    Table 2.  Parameters of PFC model

    参数名称 砂岩
    颗粒密度/(kg·m−3 2400 2000
    颗粒粒径/m 0.15~0.45 0.15~0.45
    摩擦系数 0.37 0.33
    颗粒法向刚度/(N·m−1 1.6e7 1.2e7
    颗粒切向刚度/(N·m−1 1.6e7 1.2e7
    胶结法向刚度/(N·m−3 5.0e5 4.0e7
    胶结切向刚度/(N·m−3 4.8e5 4.0e7
    下载: 导出CSV
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出版历程
收稿日期:  2022-10-25
修回日期:  2023-04-03
录用日期:  2023-04-06
刊出日期:  2024-05-15

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