The influence of hard roof cutting and pressure relief technology on the deformation law of surrounding rock in roadways
-
摘要: 针对特厚煤层坚硬顶板、宽煤柱条件下临空巷道面临的高围岩应力、大变形等问题，以老石旦煤矿16403综放工作面为工程研究背景，从宽煤柱顶板侧向破断结构角度对临空巷道大变形的影响因素进行了理论分析，采用数值模拟方法研究了对16402运输巷实施不同切顶卸压方案时，临近采空区的16403回风巷侧向顶板采动应力传递规律，并在现场施工水力压裂钻孔进行切顶卸压，实现临空巷道围岩变形控制。研究结果表明：“低位坚硬岩层悬臂梁+高位坚硬岩层砌体梁”破断结构是特厚煤层宽煤柱临空巷道大变形的主要原因，可采用切顶卸压技术破坏宽煤柱顶板侧向破断结构来控制临空巷道围岩大变形；切顶角变化可使关键块B长度发生改变，切顶角越大，则关键块B长度越小，临空侧顶板载荷向煤柱传递的程度越弱，临空巷道围岩承受的采动应力越小，切顶角为100°时临空巷道围岩垂直应力与变形量最小；在16402运输巷以切顶角100°施工水力压裂钻孔后，16403回风巷顶底板变形量较未实施切顶卸压的16402回风巷减小86.5%，两帮变形量减小87.1%，临空巷道围岩稳定性得到极大提高。Abstract: The goaf roadways have problems of high surrounding rock stress and large deformation under the conditions of hard roof and wide coal pillars in thick coal seams. In order to solve the above problems, this paper takes the 16403 fully mechanized mining face of Laoshidan Coal Mine as the engineering research background. The paper theoretically analyzes the influencing factors of large deformation of goaf roadways from the perspective of lateral fracture structure of wide coal pillar roof. The numerical simulation method is used to study the implementation of different roof cutting and pressure relief schemes for 16402 transportation roadway. The stress transmission law of the lateral roof of the 16403 return airway near the goaf during mining is studied. The hydraulic fracturing drilling is carried out on site for roof cutting and pressure relief to achieve deformation control of the surrounding rock of the goaf roadway. The research results indicate that the fracture structure of "cantilever beam in low hard rock layer+masonry beam in high hard rock layer" is the main reason for the large deformation of the wide coal pillar in the goaf roadway of the extra thick coal seam. The roof cutting and pressure relief technology can be used to destroy the lateral fracture structure of the wide coal pillar roof to control the large deformation of the surrounding rock in the goaf roadway. The change in roof cutting angle can cause a change in the length of key block B. The larger the roof cutting angle, the smaller the length of key block B. The degree of load transfer from the lateral roof of the goaf side to the coal pillar is weaker, and the mining stress borne by the surrounding rock of the goaf roadway is smaller. When the roof cutting angle is 100°, the vertical stress and deformation of the surrounding rock of the goaf roadway are the smallest. After hydraulic fracturing drilling is carried out at a roof cutting angle of 100° in the 16402 transportation roadway, the deformation of the roof and floor of the 16403 return air roadway is reduced by 86.5% compared to the 16402 return air roadway without roof cutting pressure relief. The deformation of the two sides is reduced by 87.1%. The stability of the surrounding rock of the goaf roadway is greatly improved.
-
图 1 老石旦煤矿16402工作面岩层柱状
Figure 1. Strata histogram of 16402 working face in Laoshidan Coal Mine
图 4 煤柱临空侧顶板载荷传递力学模型
Figure 4. Mechanical mode of load transfer in cool pillar roof close to goaf
图 6 坚硬顶板切顶卸压模拟设计方案
Figure 6. Simulation design schemes of hard roof cutting and pressure relief
图 7 切缝两侧顶板应力传递演化规律
Figure 7. Evolution law of stress transfer in roof on both sides of cutting crack
图 9 不同切顶角下临空巷道围岩变形量
Figure 9. Deformation amount of surrounding rock in roadway close to goaf under different roof cutting angles
-
[1] 马文涛,潘俊锋,刘少虹,等. 煤层顶板深孔“钻−切−压”预裂防冲技术试验研究[J]. 工矿自动化,2020,46(1):7-12.MA Wentao,PAN Junfeng,LIU Shaohong,et al. Experimental research on "drilling-cutting-fracturing" pre-fracturing to prevent rock burst technology for deep hole of roof of coal seam[J]. Industry and Mine Automation,2020,46(1):7-12. [2] 闫帅,柏建彪,卞卡,等. 复用回采巷道护巷煤柱合理宽度研究[J]. 岩土力学,2012,33(10):3081-3086,3150.YAN Shuai,BAI Jianbiao,BIAN Ka,et al. Investigation on rational barrier pillar width of reused gateroad in coal mines[J]. Rock and Soil Mechanics,2012,33(10):3081-3086,3150. [3] 马宏源,潘俊锋,席国军,等. 坚硬顶板强冲击工作面多巷交叉区域防冲技术[J]. 工矿自动化,2022,48(4):121-127.MA Hongyuan,PAN Junfeng,XI Guojun,et al. Rock burst prevention technology in multi-roadway intersection area of hard roof strong impact working face[J]. Journal of Mine Automation,2022,48(4):121-127. [4] 解振华,马添虎,范张磊,等. 非均质岩石损伤效应下沿空留巷煤柱宽度研究[J]. 工矿自动化,2021,47(8):56-62.XIE Zhenhua,MA Tianhu,FAN Zhanglei,et al. Research on the coal pillar width of gob-side entry retaining under the damage effect of heterogeneous rock[J]. Industry and Mine Automation,2021,47(8):56-62. [5] REN Zhicheng,ZUO Minghui. Research on technology of supporting in super-large section cut in working face with large mining height[J]. Advances in Civil Engineering,2021. DOI: 10.1155/2021/3304049. [6] 王康,来兴平,郭俊兵,等. 坚硬顶板特厚煤层综放面区段煤柱合理宽度研究[J]. 煤炭工程,2019,51(5):43-47.WANG Kang,LAI Xingping,GUO Junbing,et al. Study on the reasonable section coal pillar width for fully mechanized caving face with hard roof and extra-thick coal seam[J]. Coal Engineering,2019,51(5):43-47. [7] 王宇,涂敏,付宝杰,等. 深井侧向采动应力分布规律及沿空巷道支护[J]. 采矿与岩层控制工程学报,2020,2(3):40-47.WANG Yu,TU Min,FU Baojie,et al. Study on the distribution of side abutment pressures and ground support for double-used entries in deep mining[J]. Journal of Mining and Strata Control Engineering,2020,2(3):40-47. [8] 姚强岭,朱贵伟,郑闯凯,等. 厚煤层沿空巷道主动式超前支护技术与实践[J]. 采矿与岩层控制工程学报,2022,4(1):5-15.YAO Qiangling,ZHU Guiwei,ZHENG Chuangkai,et al. Active advanced support technology and practice of thick coal seam along goaf roadway[J]. Journal of Mining and Strata Control Engineering,2022,4(1):5-15. [9] 田建设,贾金兑,朱浩宇,等. 深部高应力双巷布置工作面煤柱宽度合理性研究[J]. 煤炭工程,2021,53(4):6-10.TIAN Jianshe,JIA Jindui,ZHU Haoyu,et al. Reasonable coal pillar width in deep high-stress working face with double lane[J]. Coal Engineering,2021,53(4):6-10. [10] 郑建伟,鞠文君,孙晓冬,等. 巷道变形差异化响应特征及支护设计分析[J]. 采矿与岩层控制工程学报,2021,3(3):13-20.ZHENG Jianwei,JU Wenjun,SUN Xiaodong,et al. Differentiation response characteristic of roadway deformation and rock supporting analysis[J]. Journal of Mining and Strata Control Engineering,2021,3(3):13-20. [11] 殷帅峰,何富连,谢福星,等. 基于偏应力分布特征的综放区段煤柱宽度研究[J]. 煤矿安全,2017,48(1):40-43.YIN Shuaifeng,HE Fulian,XIE Fuxing,et al. Study on pillar width in fully-mechanized caving section based on distribution of deviatoric stress[J]. Safety in Coal Mines,2017,48(1):40-43. [12] 姜耀东,宋红华,马振乾,等. 基于地应力反演的构造应力区沿空巷道窄煤柱宽度优化研究[J]. 煤炭学报,2018,43(2):319-326.JIANG Yaodong,SONG Honghua,MA Zhenqian,et al. Optimization research on the width of narrow coal pillar along goaf tunnel in tectonic stress zone[J]. Journal of China Coal Society,2018,43(2):319-326. [13] 王红胜,张东升,李树刚,等. 基于基本顶关键岩块B断裂线位置的窄煤柱合理宽度的确定[J]. 采矿与安全工程学报,2014,31(1):10-16.WANG Hongsheng,ZHANG Dongsheng,LI Shugang,et al. Rational width of narrow coal pillar based on the fracture line location of key rock B in main roof[J]. Journal of Mining & Safety Engineering,2014,31(1):10-16. [14] 孔令海,姜福兴,刘杰,等. 特厚煤层综放工作面区段煤柱合理宽度的微地震监测[J]. 煤炭学报,2009,34(7):871-874.KONG Linghai,JIANG Fuxing,LIU Jie,et al. High-precision microseismic monitoring system to reasonable width of segment coal pillar in extra-thick coal seam fully mechanized top-coal caving mining[J]. Journal of China Coal Society,2009,34(7):871-874. [15] 张广超,何富连,来永辉,等. 高强度开采综放工作面区段煤柱合理宽度与控制技术[J]. 煤炭学报,2016,41(9):2188-2194.ZHANG Guangchao,HE Fulian,LAI Yonghui,et al. Reasonable width and control technique of segment coal pillar with high-intensity fully-mechanized caving mining[J]. Journal of China Coal Society,2016,41(9):2188-2194. [16] 张广超,何富连. 大断面综放沿空巷道煤柱合理宽度与围岩控制[J]. 岩土力学,2016,37(6):1721-1728,1736.ZHANG Guangchao,HE Fulian. Pillar width determination and surrounding rocks control of gob-side entry with large cross-section and fully-mechanized mining[J]. Rock and Soil Mechanics,2016,37(6):1721-1728,1736. [17] 赵宾,王方田,梁宁宁,等. 高应力综放面区段煤柱合理宽度与控制技术[J]. 采矿与安全工程学报,2018,35(1):19-26.ZHAO Bin,WANG Fangtian,LIANG Ningning,et al. Reasonable segment pillar width and its control technology for fully mechanized top-coal caving face with high stress[J]. Journal of Mining & Safety Engineering,2018,35(1):19-26. [18] 蒋威,鞠文君,汪占领,等. 厚硬基本顶综放沿空巷道覆岩应力分布特征及合理煤柱宽度确定[J]. 采矿与安全工程学报,2020,37(6):1142-1151.JIANG Wei,JU Wenjun,WANG Zhanling,et al. Characteristics of overburden stress distribution and rational pillar width determination of gob-side roadway with thick and hard basic roof in fully mechanized top coal caving workface[J]. Journal of Mining & Safety Engineering,2020,37(6):1142-1151. [19] 杜贝举. 坚硬顶板特厚煤层临空巷道强矿压机理及控制研究[D]. 徐州:中国矿业大学,2022.DU Beiju. Study on strong ground pressure mechanism of gob-side roadway and its control in extra thick coal seam with hard roof[D]. Xuzhou:China University of Mining and Technology,2022. [20] 王志强,武超,罗健侨,等. 特厚煤层巨厚顶板分层综采工作面区段煤柱失稳机理及控制[J]. 煤炭学报,2021,46(12):3756-3770.WANG Zhiqiang,WU Chao,LUO Jianqiao,et al. Instability mechanism and control of section coal pillar in fully mechanized mining face with super thick roof and extra thick seam[J]. Journal of China Coal Society,2021,46(12):3756-3770. -
下载:
点击查看大图
图(11)
计量
- 文章访问数: 112
- HTML全文浏览量: 34
- PDF下载量: 18
- 被引次数: 0
