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基于FLAC3D和DEM数据的缓倾斜煤层开采沉陷分析

甘智慧 尚慧 杜荣军 占惠珠

甘智慧, 尚慧, 杜荣军, 占惠珠. 基于FLAC3D和DEM数据的缓倾斜煤层开采沉陷分析[J]. 煤田地质与勘探, 2021, 49(3): 158-166. doi: 10.3969/j.issn.1001-1986.2021.03.020
引用本文: 甘智慧, 尚慧, 杜荣军, 占惠珠. 基于FLAC3D和DEM数据的缓倾斜煤层开采沉陷分析[J]. 煤田地质与勘探, 2021, 49(3): 158-166. doi: 10.3969/j.issn.1001-1986.2021.03.020
GAN Zhihui, SHANG Hui, DU Rongjun, ZHAN Huizhu. Mining subsidence analysis of gently inclined coal seams based on FLAC3D and DEM data[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(3): 158-166. doi: 10.3969/j.issn.1001-1986.2021.03.020
Citation: GAN Zhihui, SHANG Hui, DU Rongjun, ZHAN Huizhu. Mining subsidence analysis of gently inclined coal seams based on FLAC3D and DEM data[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(3): 158-166. doi: 10.3969/j.issn.1001-1986.2021.03.020

基于FLAC3D和DEM数据的缓倾斜煤层开采沉陷分析

doi: 10.3969/j.issn.1001-1986.2021.03.020
基金项目: 

国家自然科学基金项目 41702377

中国博士后科学基金项目 2017M623208

陕西省自然科学基础研究计划项目 2017JQ4008

详细信息
    第一作者:

    甘智慧, 1995年生, 女, 江西宜春人, 硕士研究生, 从事岩土体稳定性与地质灾害防治方面研究.E-mail: 847288861@qq.com

    通信作者:

    尚慧, 1985年生, 女, 陕西宝鸡人, 博士, 讲师, 硕士生导师, 从事岩土体稳定性与地质灾害防治、矿山环境修复方面研究.E-mail: shanghui_happy@163.com

  • 中图分类号: TD325

Mining subsidence analysis of gently inclined coal seams based on FLAC3D and DEM data

  • 摘要: 宁夏石嘴山矿区位于西部黄河流域,其煤矿采空区沉陷导致地表生态和环境问题频发,对其采煤沉陷分析将对西部黄河流域煤矿区的环境修复有一定的积极作用。为研究缓倾斜煤层采空区围岩应力与位移场演化特征,以宁夏石嘴山矿区为对象,基于FLAC3D数值模拟软件,建立缓斜煤层开采三维数值模型,计算分析采空区围岩应力、塑性区及位移变化规律,并基于两时相DEM叠加统计分析地表位移变化,与数值模拟结果进行相互验证。结果表明:地下开采引起应力重分布,采空区顶板及煤柱出现明显的应力集中现象,最大主应力呈现从煤层顶板向地表递减的变化趋势;越靠近采空区顶部的岩层垂直位移越大,随着远离采空区逐渐减少,开采完成后地表垂直位移最大值约12 m;随着采空区面积的不断增大,采空区四周及角隅处塑性区逐步延伸扩大,且以剪切破坏为主;地面沉陷盆地不对称,2个沉降中心均发生在沉陷盆地中部且偏下山方向,下山方向比上山方向影响范围更大;数值模拟计算的沉降量与两时相DEM叠加统计分析的变化量结果及趋势基本一致,研究成果可为煤炭安全开采提供参考依据,为地表沉降监测提供新方法。

     

  • 图  石嘴山矿区位置

    Fig. 1  Location of Shizuishan Mining Area

    图  石嘴山矿区Ⅱ—Ⅱ′工程地质剖面

    Fig. 2  Engineering geological section at row of Ⅱ-Ⅱ′ in Shizuishan Mining Area

    图  三维数值模型

    Fig. 3  Three dimensional numerical model

    图  各开采水平倾向及走向方向应力云图

    Fig. 4  v

    图  各开采水平倾向及走向方向位移云图

    Fig. 5  Displacement cloud maps of inclination and strike direction of each mining level

    图  最终地表位移下沉等值线

    Fig. 6  The final surface displacement subsidence contour

    图  各开采水平塑性区分布

    Fig. 7  The horizontal plastic zone distribution of each mining level

    图  石嘴山矿区两时相DEM

    Fig. 8  Bi-temporal images DEM in Shizuishan Mining Area

    图  石嘴山矿区20世纪70年代—2003年沉降变化幅度

    Fig. 9  The subsidence variation range chart of Shizuishan Mining Area from 1970s to 2003

    图  10  Ⅱ—Ⅱ′剖面地形线变化对比图(20世纪70年代—2003年)

    Fig. 10  Contrast of section Ⅱ-Ⅱ′ topographic line change contrast diagram(1970s-2003)

    图  11  两时相DEM叠加分析与FLAC3D数值模拟地表位移对比

    Fig. 11  Comparison of surface displacement by bi-temporal images DEM superposition analysis and FLAC3D numerical Simulation

    表  1  岩层物理力学参数[16]

    Table  1  Physical and mechanical parameters of rock strata[16]

    岩性 容重/(kN·m–3) 黏聚力/MPa 内摩擦角/(°) 弹性模量/104 MPa 泊松比 抗拉强度/MPa
    砂质页岩、砂岩互层 22.5 26 37 3.70 0.30 4.50
    砂质页岩 21.0 17 30 3.00 0.30 3.64
    砂质页岩夹砂岩 21.5 20 35 3.40 0.30 3.85
    砂岩夹砂质页岩 23.0 30 40 4.00 0.30 4.70
    砂岩 24.0 35 45 4.50 0.30 5.65
    19.0 3 25 0.20 0.35 1.11
    砂质页岩夹页岩 20.0 15 28 2.70 0.22 3.15
    下载: 导出CSV
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  • 收稿日期:  2020-11-06
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