Advance Search

CHANG Jucai,GUO Yijun,WU Bowen,et al. Study on failure characteristics and control of roof separation with weak interlayer of deep gob-side entry driving[J]. Coal Science and Technology,2024,52(9):88−102

. DOI: 10.12438/cst.2024-0557
Citation:

CHANG Jucai,GUO Yijun,WU Bowen,et al. Study on failure characteristics and control of roof separation with weak interlayer of deep gob-side entry driving[J]. Coal Science and Technology,2024,52(9):88−102

. DOI: 10.12438/cst.2024-0557

Study on failure characteristics and control of roof separation with weak interlayer of deep gob-side entry driving

Funds: 

National Natural Science Foundation of China (52174105,52204079); Anhui Province Excellent Research and Innovation Team Project (2023AH010023)

More Information
  • Author Bio:

    CHANG Jucai: 常聚才,男,山东临沂人,二级教授,博士生导师,全国煤炭教育工作先进个人,“安徽省青年五四奖章”获得者,“全国煤炭青年科技奖”获得者,“安徽省青年科技奖”获得者,安徽省学术和技术带头人。研究方向:矿山压力与岩层控制、巷道围岩控制技术、煤炭安全智能开采。主要成果:获国家科学技术进步二等奖1项,安徽省科技进步一等奖4项,教育部科学技术二等奖2项,中国煤炭工业协会科学技术一等奖1项,在International Journal of Coal Science & Technology、《煤炭学报》等国内外著名期刊上发表学术论文70余篇

  • Received Date: April 25, 2024
  • Available Online: August 27, 2024
  • Roof with weak interlayer has significant influence on the stability of deep gob-side entry driving, to effectively control the separation of roof with weak interlayer in deep gob-side entry driving under high deviatoric stress, based on the mechanical experiment of composite specimen with weak interlayer and numerical simulation experiment of gob-side entry driving under the influence of mining, the influence of the thickness, number and position of weak interlayer and the evolution law of roof separation under high deviatoric stress conditions are obtained, the main reasons for separation of the roof with weak interlayers of deep gob-side entry driving are elucidated. The key points for controlling the roof with weak interlayer are analyzed using the mechanical model of cantilever beams under the support load and coal pillar support load, and the separation control method is subsequently proposed. The results show that the influence on the deterioration of the mechanical properties of the composite gradually becomes larger with the increase of the thickness and the number of layers of the weak interlayer, the influence on the deterioration of the composite with weak interlayer at the low position is stronger than that at the high position. The fracture of the composite specimen is produced by the weak interlayer, and the characteristics of the fracture development are different with its thickness, the number and position. The main shear failure zone generated at the left shoulder corner of the roof and connected to the adjacent rock failure area near the weak interlayer after gob-side entry driving, resulting in the separation of the weak interlayer, and the development morphology of main shear failure zone and non-coordinated degree deformation of roof vary with the deviation angle of principal stress and the thickness, number and position of weak interlayers, which revealed the instability mechanism of roof with weak interlayer of deep gob-side entry driving. The mechanical model of roof separation under the support load and the supporting load of coal pillar was established, which found that the separation of weak interlayer in the anchorage zone was 79% lower than that outside the anchorage zone, the degree of influence on the spatial distribution of separation under different influencing factors is as follows: supporting load of pillar, supporting load of roof, elastic modulus of the roof. According to the separation law and control points of the composite roof with weak interlayer in the deep gob-side roadway, the following separation joint control method was proposed: increasing the bearing capacity of coal pillars, reducing the development of the failure in roof and increasing the deformation coordination of roof with weak interlayer. The maximum separation of the roof is 10 mm according to on-site separation monitoring, indicating that this method can effectively control the separation of the roof with weak interlayers.

  • [1]
    袁亮. 深部采动响应与灾害防控研究进展[J]. 煤炭学报,2021,46(3):716−725.

    YUAN Liang. Research progress of mining response and disaster prevention and control in deep coal mines[J]. Journal of China Coal Society,2021,46(3):716−725.
    [2]
    谢和平. 深部岩体力学与开采理论研究进展[J]. 煤炭学报,2019,44(5):1283−1305.

    XIE Heping. Research review of the state key research development program of China:deep rock mechanics and mining theory[J]. Journal of China Coal Society,2019,44(5):1283−1305.
    [3]
    罗霄. 煤巷复合层状顶板承载特性研究[D]. 北京:中国矿业大学(北京),2019.

    LUO Xiao. The Study of bearing characteristics of composite layered roof in the coal roadway[D]. Beijing:China University of Mining and Technology-Beijing,2019.
    [4]
    李桂臣,杨森,孙元田,等. 复杂条件下巷道围岩控制技术研究进展[J]. 煤炭科学技术,2022,50(6):29−45.

    LI Guichen,YANG Sen,SUN Yuantian,et al. Research progress of roadway surrounding strata rock control technologies under complex condition[J]. Coal Science and Technology,2022,50(6):29−45.
    [5]
    程利兴,康红普,姜鹏飞,等. 深井沿空掘巷围岩变形破坏特征及控制技术研究[J]. 采矿与安全工程学报,2021,38(2):227−236.

    CHENG Lixing,KANG Hongpu,JIANG Pengfei,et al. Deformation and failure characteristics and control technology of surrounding rocks in deeply gob-side entry driving[J]. Journal of Mining & Safety Engineering,2021,38(2):227−236.
    [6]
    郭金刚,王伟光,岳帅帅,等. 特厚煤层综放沿空掘巷围岩控制机理及其应用[J]. 煤炭学报,2017,42(4):825−832.

    GUO Jingang,WANG Weiguang,YUE Shuaishuai,et al. Surrounding rock control mechanism and its application of gob-side driving entry in extra thick coal seam[J]. Journal of China Coal Society,2017,42(4):825−832.
    [7]
    常聚才. 深井复合顶板回采巷道支护技术研究[J]. 煤炭科学技术,2016,44(6):60−63,77.

    CHANG Jucai. Study on complex roof support technology of mining gateway in deep mine[J]. Coal Science and Technology,2016,44(6):60−63,77.
    [8]
    张源,万志军,李付臣,等. 不稳定覆岩下沿空掘巷围岩大变形机理[J]. 采矿与安全工程学报,2012,29(4):451−458.

    ZHANG Yuan,WAN Zhijun,LI Fuchen,et al. Large deformation mechanism of roadway driving along Goaf Under Unstable Overlying Rock Strata[J]. Journal of Mining & Safety Engineering,2012,29(4):451−458.
    [9]
    张洪伟,万志军,张源,等. 非充分稳定覆岩下综放沿空掘巷窄煤柱变形机理[J]. 采矿与安全工程学报,2016,33(4):692−698.

    ZHANG Hongwei,WAN Zhijun,ZHANG Yuan,et al. Deformation mechanism of narrow coal pillar in the fully-mechanized gob-side entry with incompletely stable overlying strata[J]. Journal of Mining & Safety Engineering,2016,33(4):692−698.
    [10]
    张农,李桂臣,阚甲广. 煤巷顶板软弱夹层层位对锚杆支护结构稳定性影响[J]. 岩土力学,2011,32(9):2753−2758.

    ZHANG Nong,LI Guichen,KAN Jiaguang. Influence of soft interlayer location in coal roof on stability of roadway bolting structure[J]. Rock and Soil Mechanics,2011,32(9):2753−2758.
    [11]
    贾后省,潘坤,李东发,等. 含软弱夹层顶板采动巷道冒顶机理与控制方法[J]. 中国矿业大学学报,2022,51(1):67−76,89.

    JIA Houxing,PAN Kun,LI Fadong,et al. Roof fall mechanism and control method of roof with weak interlayer in mining roadway[J]. Journal of China University of Mining & Technology,2022,51(1):67−76,89.
    [12]
    李桂臣. 软弱夹层顶板巷道围岩稳定与安全控制研究[D]. 徐州:中国矿业大学,2008.

    LI Guichen. Study on the surrounding rock stability and safety control of roadways roof embedded weak intercalated seam[D]. Xuzhou:China University of Mining and Technology,2008.
    [13]
    丁书学. 深部含软弱夹层巷道围岩锚固承载特性及工程应用[D]. 徐州:中国矿业大学,2019.

    DING Shuxue. Study on anchoring and bearing mechanical properties of surrounding rock containing weak interlayer in deep roadway and application[D]. Xuzhou:China University of Mining and Technology,2019.
    [14]
    贾后省,李国盛,王路瑶,等. 采动巷道应力场环境特征与冒顶机理研究[J]. 采矿与安全工程学报,2017,34(4):707−714.

    JIA Housheng,LI Guosheng,WANG Luyao,et al. Characteristics of stress-field environment and roof falling mechanism of mining influenced roadway[J]. Journal of Mining & Safety Engineering,2017,34(4):707−714.
    [15]
    李磊,柏建彪,徐营,等. 复合顶板沿空掘巷围岩控制研究[J]. 采矿与安全工程学报,2011,28(3):376−383,390.

    LI Lei,BAI Jianbiao,XU Ying,et al. Research on rock control of roadway with complex roof driven along goaf[J]. Journal of Mining & Safety Engineering,2011,28(3):376−383,390.
    [16]
    柏建彪,侯朝炯,黄汉富. 沿空掘巷窄煤柱稳定性数值模拟研究[J]. 岩石力学与工程学报,2004,23(20):3475−3479. doi: 10.3321/j.issn:1000-6915.2004.20.015

    BAI Jianbiao,HOU Chaojiong,HUANG Hanfu. Numerical simulation study on stability of narrow coal pillar of roadway driving along goaf[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(20):3475−3479. doi: 10.3321/j.issn:1000-6915.2004.20.015
    [17]
    王德超,王琦,李术才,等. 深井综放沿空掘巷围岩变形破坏机制及控制对策[J]. 采矿与安全工程学报,2014,31(5):665−673.

    WANG Dechao,WANG Qi,LI Shucai,et al. Mechanism of rock deformation and failure and its control technology of roadway driving along next goaf in fully mechanized top coal caving face of deep mines[J]. Journal of Mining & Safety Engineering,2014,31(5):665−673.
    [18]
    侯朝炯,李学华. 综放沿空掘巷围岩大、小结构的稳定性原理[J]. 煤炭学报,2001(1):1−7.

    HOU Chaojiong,LI Xuehua. Stability principle of big and small structures of rock surrounding roadway driven along goaf in fully mechanized top coal caving face[J]. Journal of China Coal Society,2001(1):1−7.
    [19]
    王猛,夏恩乐,神文龙,等. 考虑采空区矸石压缩效应的沿空掘巷时机确定方法[J]. 采矿与安全工程学报,2020,37(5):928−935.

    WANG Meng,XIA Enle,SHEN Wenlong,et al. Determining method of the driving time for the gob-side entry considering the effect of gangue compression[J]. Journal of Mining & Safety Engineering,2020,37(5):928−935.
    [20]
    李为腾,王琦,李术才,等. 深部顶板夹煤层巷道围岩变形破坏机制及控制[J]. 煤炭学报,2014,39(1):47−56.

    LI Weiteng,WANG Qi,LI Shucai,et al. Deformation and failure mechanism analysis and control of deep roadway with intercalated coal seam in roof[J]. Journal of China Coal Society,2014,39(1):47−56.
    [21]
    李昌进,刘伊帅,李廷春,等. 泥岩相似材料力学性能影响因素试验研究[J]. 矿业研究与开发,2020,40(6):80−84.

    LI Changjin,LIU Yishuai,LI Tingchun,et al. Experimental study on influencing factors of mechanical properties for mudstone similar material[J]. Safety in Coal Mines,2020,40(6):80−84.
    [22]
    王兆会,孙文超,水艳婷,等. 千米深井超长工作面采动应力旋转轨迹及其推进方向效应[J]. 煤炭学报,2022,47(2):634−650.

    WANG Zhaohui,SUN Wenchao,SHUI Yanting,et al. Mining-induced stress rotation trace and its sensitivity to face advance direction in kilometer deep longwall panel with large face length[J]. Journal of China Coal Society,2022,47(2):634−650.
    [23]
    刘洪涛,陈子晗,郭晓菲,等. 采场等效孔模型及主应力旋转规律[J]. 煤炭学报,2023,48(10):3646−3658.

    LIU Hongtao,CHEN Zihan,GUO Xiaofei,et al. Research on stope equivalent hole model and rotation law of principal stress[J]. Journal of China Coal Society,2023,48(10):3646−3658.
    [24]
    贾后省,潘坤,刘少伟,等. 采动巷道复合顶板离层破坏机理与预测方法[J]. 采矿与安全工程学报,2021,38(3):518−527.

    JIA Housheng,PAN Kun,LIU Shaowei,et al. Mechanism and prediction method of rock layer separation failure of composite roof in mining roadway[J]. Journal of Mining & Safety Engineering,2021,38(3):518−527.
    [25]
    赵国贞,马占国,孙凯,等. 小煤柱沿空掘巷围岩变形控制机理研究[J]. 采矿与安全工程学报,2010,27(4):517−521. doi: 10.3969/j.issn.1673-3363.2010.04.013

    ZHAO Guozhen,MA Zhanguo,SUN Kai,et al. Research on deformation controlling mechanism of the narrow pillar of roadway driving along next goaf[J]. Journal of Mining & Safety Engineering,2010,27(4):517−521. doi: 10.3969/j.issn.1673-3363.2010.04.013
    [26]
    刘会强. 屯兰矿复合顶板沿空留巷围岩控制技术研究[D]. 徐州:中国矿业大学,2023.

    LIU Huiqiang. Study on surrounding rock control technology of gob-side entry retaining with composite roof in tunlan mine[D]. Xuzhou:China University of Mining and Technology,2023.
    [27]
    张蓓. 厚层放顶煤小煤柱沿空巷道采动影响段围岩变形机理与强化控制技术研究[D]. 徐州:中国矿业大学,2015.

    ZHANG Bei. Deformation mechanisms and strengthen technology for the gob-side roadway surrounding rock under mining influence in top coal caving face with thick layer[D]. Xuzhou:China University of Mining and Technology,2015.
    [28]
    祖国利,王俊,宁建国,等. 冲击载荷作用下预应力锚杆锚固阻裂效应试验研究[J]. 岩土工程学报,2023,45(8):1743−1753.

    ZU Guoli,WANG Jun,NING Jianguo,et al. Experimental study on anchoring crack-resistance effects of prestressed anchor under impact loads[J]. Chinese Journal of Geotechnical Engineering,2023,45(8):1743−1753.
    [29]
    杜帅. 考虑锚杆锚固力扩散效应的复合顶板支护参数优化研究[D]. 太原:太原理工大学,2021.

    DU Shuai. Optimization of support parameters of composite roof considering the dispersion effect of bolt anchoring force[D]. Taiyuan:Taiyuan University of Technology,2021.
  • Cited by

    Periodical cited type(3)

    1. 刘佳佳,李元隆,高建良,王丹,张云龙. 超临界CO_2脉动作用对低阶煤微观-宏观结构损伤演化特征. 煤炭科学技术. 2025(02): 190-199 . 本站查看
    2. 傅师贵,刘泽功,常帅,杨帅,张健玉,乔国栋,张鑫. 深井高瓦斯低渗煤层深孔聚能爆破增透试验研究. 煤炭科学技术. 2025(05): 158-173 . 本站查看
    3. 胡登卫. 可控冲击波煤层致裂增透效果研究. 采矿技术. 2024(03): 296-301 .

    Other cited types(2)

Catalog

    Article views (195) PDF downloads (94) Cited by(5)
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return