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煤矿井下巷道围岩地质力学测试试验研究

于可伟

于可伟. 煤矿井下巷道围岩地质力学测试试验研究[J]. 煤炭科学技术, 2019, (12).
引用本文: 于可伟. 煤矿井下巷道围岩地质力学测试试验研究[J]. 煤炭科学技术, 2019, (12).
YU Kewei. Experimental study on geo-mechanics test of surrounding rock of underground roadway in coal mine[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (12).
Citation: YU Kewei. Experimental study on geo-mechanics test of surrounding rock of underground roadway in coal mine[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (12).

煤矿井下巷道围岩地质力学测试试验研究

Experimental study on geo-mechanics test of surrounding rock of underground roadway in coal mine

  • 摘要: 蒋家河矿开采的侏罗系延安组4煤埋深已超过650 m,进入深部煤炭开采,受埋深、采动压力以及构造应力影响,巷道围岩破坏严重,出现大范围底鼓、帮鼓、顶板下沉等情况,严重影响矿井正常生产。为解决巷道围岩破坏严重 问题,通过采用小孔径水压致裂地应力测量方法与装置和钻孔触探法,对蒋家河煤矿井下深部开采区域的2个测点的地应力和巷道围岩强度进行了原位测试,分析了蒋家河矿4煤所处的围岩地质力学分布规律和力学参数 。研究结果表明:蒋家河煤矿井下最大水平主应力σH平均值为16.00 MPa,最小水平主应力σh平均值为8.56 MPa,垂直应力σv平均值为15.31 MPa,应力场类型为σH>σv>σh型应力场;区域应力场以构造应力场为主,水平主应力占优势,最大水平主应力方向为NEE方向;顶板围岩结构观测结果显示,该区域4煤厚度差异较大,煤体完整性相对较好,4煤 煤体强度平均值为16.84 MPa,属中硬煤体;4煤 顶板以上20 m范围内主要有泥岩,泥质砂岩和中砂岩,均布存在小煤夹层,岩性变化较多,岩层结构复杂,泥岩遇水软化特征明显,强度较低,裂隙发育,测试结果为该矿的二采区巷道布置及其支护方式提供准确的技术决策。
    Abstract: No. 4 coal seam from Yan’an Formation of the Jurassic in Jiangjiahe Coal Mine has a buried depth of more than 650 m, indicating that it has belonged to deep coal mining. Affected by deep buried depth, mining-induced pressure and tectonic stress, serious damage was observed in roadway and surrounding rocks with falling from large range of floor heave, rib spalling, and roof subsidence etc, causing serious disruption to normal mining operations. In order to solve the damage to roadway surrounding rock, investigations were carried out to obtain the geo-mechanical distribution law and mechanical parameters of the surrounding rock in the No.4 coal seam of Jiangjiahe Coal Mine.In-situ measurement of in-situ stress and strength of roadway surrounding rock were performed at two measuring points using methods such as in-situ measurement of in-situ stress and device and borehole penetration method. The studies have found that in Jiangjiahe Coal Mine the average value of the maximum horizontal principal stress is 16.00 MPa, the average value of the minimum horizontal principal stress is 8.56 MPa, the average value of the vertical stress is 15.31 MPa, and it has a stress field type of σH>σv>σh.The regional stress field is mainly a tectonic stress field, with dominating horizontal principal stress, and NEE as the direction of the maximum horizontal principal stress.The structure analysis for the roof, surrounding rock implied a coal layer with fairly significant deviation in depth and a relatively good wholeness of coal body.Besides the average strength of coal body is 16.84 MPa, a typical medium hard coal body,the area 20 meters above the roof of coal seam is mainly filled with mudstone, argillaceous sandstone and medium sandstone with even distribution of small coal inter-beds, wide range on lithology and a complex structure of rock layer. This study would provide an accurate technical base for the roadway layout and relating supporting methods in the second mining area of the mine.
  •   水压致裂法地应力测量示意

      水压致裂法力学模型

      钻孔触探法围岩强度测定示意

      ZF201回风巷地应力测点位置

      地应力测试钻孔布置

      各测站水力压裂曲线

      各个测站煤岩体强度测试结果

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    其他类型引用(9)

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  • 被引次数: 20
出版历程
  • 网络出版日期:  2023-04-02
  • 发布日期:  2019-12-24

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