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采煤区地表拉张裂缝演化及其控制因素物理模拟试验

黄河 冯宇 严家平 鲁海峰 刘伟 郭宝伟 尚相春

黄河, 冯宇, 严家平, 鲁海峰, 刘伟, 郭宝伟, 尚相春. 采煤区地表拉张裂缝演化及其控制因素物理模拟试验[J]. 中国地质灾害与防治学报, 2021, 32(4): 93-98. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-12
引用本文: 黄河, 冯宇, 严家平, 鲁海峰, 刘伟, 郭宝伟, 尚相春. 采煤区地表拉张裂缝演化及其控制因素物理模拟试验[J]. 中国地质灾害与防治学报, 2021, 32(4): 93-98. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-12
He HUANG, Yu FENG, Jiaping YAN, Haifeng LU, Wei LIU, Baowei GUO, Xiangchun SHANG. Physical model experiment on formation of surface tension fractures and their controlling factors in a coal mining area[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 93-98. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-12
Citation: He HUANG, Yu FENG, Jiaping YAN, Haifeng LU, Wei LIU, Baowei GUO, Xiangchun SHANG. Physical model experiment on formation of surface tension fractures and their controlling factors in a coal mining area[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 93-98. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-12

采煤区地表拉张裂缝演化及其控制因素物理模拟试验

doi: 10.16031/j.cnki.issn.1003-8035.2021.04-12
基金项目: 国家自然科学基金项目(41977253)
详细信息
    作者简介:

    黄河:黄 河(1976-),男,安徽固镇人,博士,副教授,研究方向为地质灾害防治。E-mail:1550826493@qq.com

  • 中图分类号: P694

Physical model experiment on formation of surface tension fractures and their controlling factors in a coal mining area

  • 摘要: 基于自制装置室内模拟试验和现场试验,研究了黏土体含水量变化及应力环境改变对采煤区地表拉张裂隙发育的影响,研究结果表明:在30%、35%、40%三种含水量情况下,随着黏土体含水量增高,土样表面拉张裂隙发育宽度和深度均明显降低,且拉张裂隙发育呈现时间上的滞后;当含水量增至40%时,土样表面不会产生拉张裂隙;在土样表面人为形成应力薄弱区,可以有效改变拉张裂隙发育位置;在孙疃煤矿1047工作面通过增湿试验地表“切眼裂隙”发育得到有效抑制;应力引导对地表“风机裂隙”的发育方向造成一定影响。
  • 图  1  试验装置示意图

    Figure  1.  Schematic diagram of testing device

    图  2  含水量为30%的土样表面裂隙发育情况

    Figure  2.  Development of surface cracks of soil sample with 30% water content

    图  3  含水量为35%的土样表面裂隙发育情况

    Figure  3.  Development of surface cracks of soil sample with 35% water content

    图  4  含水量为35%添加划痕的土样表面裂隙发育情况

    Figure  4.  Development of surface cracks of soil sample with 35% water content and scratch

    图  5  现场试验地块位置示意图

    Figure  5.  Location of field test site

    表  1  室内试验与现场试验黏土基本性质对比

    Table  1.   Comparison of clay properties between laboratory test and field test

    黏土类别土粒比重
    Gs
    塑限
    Wp/%
    液限
    WL/%
    塑性指数
    Ip
    自由膨胀率
    δ/%
    室内试验用土2.7423.441.518.148
    现场地表黏土2.7423.241.418.246
      注:表中数据为现场与室内土样测试后的平均值。
    下载: 导出CSV

    表  2  不同试验地段拉张裂隙发育情况对比

    Table  2.   Comparison of tensile fractures development in different testing sections

    地段拉张裂隙数量/条拉张裂隙宽度/mm
    增湿地段12
    未增湿地段34~11
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-07-22
  • 修回日期:  2020-08-06
  • 网络出版日期:  2021-10-11
  • 刊出日期:  2021-08-25

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