王红胜;赵杨阳;李磊;郭卫彬;朱广安;肖双双;

• 1:西安科技大学能源学院
• 2:西安科技大学冲击地压防治研究所

摘要(Abstract)：

针对松软厚煤层综放大跨度开切眼围岩控制难题,以魏家地煤矿2303工作面开切眼为工程背景,采用数值模拟与现场实践相结合的方法,提出了三心微拱形开切眼断面形状,探讨了三心微拱形开切眼围岩应力分布特征及破坏机理,并与矩形切眼对比分析。结果表明:三心微拱形开切眼的肩角和顶板受力均匀,能够将顶板垂直应力传递到两帮,肩部所受压应力明显减小,未出现较大应力集中现象;肩角附近围岩主要受到压剪破坏,破坏区域集中,呈"蝶形"分布;顶板围岩受到拉剪破坏,破坏区域面积减小,围岩相对稳定;且弧形顶板、肩角有利于锚杆安装。基于三心微拱形开切眼围岩破坏特征,提出了锚杆-锚索-锚网联合支护的围岩控制技术,顶板下沉量减少50%,两帮移近量减少55%;在2303工作面进行工业性试验,现场实测顶板下沉量为170 mm,两帮相对移近量为220 mm,围岩控制效果良好。

关键词(KeyWords)： 三心微拱形;综放开采;大跨度开切眼;软厚煤层;破坏机理

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51974231,51904235);; 国家重点基础研究计划(973计划)(2015CB251600);; 中国博士后科学基金(2018M643692);; 陕西省自然科学基础研究计划(2019JQ-487)

作者(Author): 王红胜;赵杨阳;李磊;郭卫彬;朱广安;肖双双;

Email:

DOI: 10.13800/j.cnki.xakjdxxb.2020.0107

参考文献(References)：

• [1]何富连，王晓明，许磊，等．大断面开切眼主应力差转移规律及支护技术[J]．岩土力学，2014,35(6):1703-1710.HE Fu-lian,WANG Xiao-ming,XU Lei,et al. Principal stress difference transfer law and support in large-section open-off cut[J]. Rock and Soil Mechanics,2014,35(6):1703-1710.
• [2]蒋力帅，马念杰，赵志强，等．综放工作面沿空开开切眼布置与支护技术研究[J]．采矿与安全工程学报，2014,31(1):22-27.JIANG Li-shuai,MA Nian-jie,ZHAO Zhi-qiang,et al.Arrangement and support technology of open-off cut along gob area in fully mechanized caving face[J]. Journal of Mining&Safety Engineering,2014,31(1):22-27.
• [3]谢小平，艾德春．特厚煤层大断面开开切眼支护技术研究[J]．煤炭技术，2016,35(1):74-76.XIE Xiao-ping,AI Dei-chun. Research on technology of open-off cut supporting of large section of extremely thick coal seam[J]. Coal Technology,2016,35(1):74-76.
• [4]何富连，薄云山，徐祝贺，等．厚煤顶开开切眼围岩稳定性及其锚索合理构型研究[J]．采矿与安全工程学报，2015,32(2):233-239.HE Fu-lian,BO Yun-shan,XU Zhu-he,et al. Research on stability of open-off cut surrounding rock with thick coal roof and its reasonable anchor cable configuration[J]. Journal of Mining&Safety Engineering,2015,32(2),233-239.
• [5]王宏志，张东升，王旭锋，等．复合顶板大断面开开切眼锚网索支护技术研究[J]．煤炭科学技术，2018,46(4):105-109.WANG Hong-zhi,ZHAN Dong-sheng,WANG Xu-feng,et al. Study on bolt-mesh-anchor support technology of open-off cut with compound roof and large cross section[J]. Coal Science and Technology,2018,46(4):105-109.
• [6]何富连，许磊，吴焕凯，等．大断面开切眼顶板偏应力运移及围岩稳定[J]．岩土工程学报，2014,36(6):1122-1128.HE Fu-lian,XU Lei,WU Huan-kai,et al. Deviatoric stress transfer and stability of surrounding rock in largesection open-off cut roof[J]. Chinese Journal of Geotechnical Engineering,2014,36(6):1122-1128.
• [7]马占元．大跨度开切眼围岩稳定性分级及变形控制研究[J]．煤炭工程，2015,47(6):49-52.MA Zhan-yuan. Study on surrounding rock stability classification and deformation control of large-span open-off[J]. Coal Engineering,2015,47(6):49-52.
• [8]贾尚昆，李晓辉，高建政．厚煤层综放面开切眼跨度对围岩稳定的影响[J]．金属矿山，2012(7):23-27.JIA Shang-kun,LI Xiao-hui,GAO Jian-zheng. Effect of fully mechanized caving face cut-hole span for thick coal seams on the stability of surrounding rock mass[J].Metal Mine,2012(7):23-27.
• [9]张凤岩，王军．厚煤层大断面开开切眼围岩破坏特征及控制技术[J]．煤炭技术，2016,35(5):26-29.ZHANG Feng-yan,WANG Jun. Failure features of surrounding rock and supporting technology in thick seam and large section open-off cut[J]. Coal Technology,2016,35(5):26-29.
• [10]黄庆国，高峰，张磊，等．特厚煤层综放工作面大断面开切眼支护技术[J]．煤炭科学技术，2011,39(5):6-10.HUANG Qing-guo,GAO Feng,ZHANG Lei,et al. Support technology of large cross section open-off cut for fully mechanized top coal caving mining face in ultra thick seam[J]. Coal Science and Technology,2011,39(5):6-10.
• [11]张理生．不稳定厚层泥岩顶板大跨度开切眼支护技术研究[J]．煤炭工程，2014,46(7):31-33.ZHANG Li-sheng. Study on large span support technology of open-off cut with unstable thick mudstone roof[J]. Coal Engineering,2014,46(7):31-33.
• [12]王红卫，程志恒．三软厚煤层综放开采大断面开开切眼围岩控制技术研究[J]．煤炭工程，2018,50(12):41-45.WANG Hong-wei,CHEN Zhi-heng. Active passive combined support technique for large span open off cut in thick coal seam[J]. Coal Engineering,2018,50(12):41-45.
• [13]孙海良．大埋深三软煤层复合顶板大断面开开切眼支护技术[J]．煤炭科学技术，2017,45(12):42-45,69.SUN Hai-liang. Support technology of large section and compound roof open-off cut in soft roof and soft floor and soft coal and deep buried seam[J]. Coal Science and Technology,2017,45(12):42-45,69.
• [14]高鸿宇，冯国瑞．特厚煤层大断面开开切眼支护研究[J]．煤炭科学技术，2014,42(S1):61-63.GAO Hong-yu,FENG Guo-rui. Research on support of large-section open-off cut construction technology of soft and extremely-thick coal-seam[J]. Coal Science and Technology,2014,42(S1):61-63.
• [15]王红胜，张东升，王旭锋，等．综放面近距离跨采下山分区加固技术[J]．西安科技大学学报，2007,37(4):559-564.WANG Hong-sheng,ZHANG Dong-sheng,WANG Xufeng,et al. Close quarters overhead mining diphead sub area reinforcement technique in top-caving mining coalface and its application[J]. Journal of Xi’an University of Science and Technology,2007,37(4):559-564.
• [16]蒋志刚，阚磊，刘栋，等．厚顶煤大跨度开开切眼锚杆锚索支护技术[J]．煤矿安全，2012,43(2):102-105.JIANG Zhi-gang,KAN Lei,LIU Dong,et al. Technology of on anchored bolt and anchored rope supporting in large span open-off cut of thick roof[J]. Safety in Coal Mines,2012,43(2):102-105.
• [17]曲建光．大跨度开开切眼围岩强化控制技术研究[J]．煤炭科学技术，2015,43(7):1-5.QU Jian-guang. Study on intensified control technology of large span open-off cut surrounding rock[J]. Coal Science and Technology,2015,43(7):1-5.