回撤工作面倾向切顶卸压关键参数研究

doi:10.11799/ce202308013

摘要/Abstract

摘要：

切顶卸压技术有效地提高了煤炭的回收率并减少资源浪费, 已在我国进行了大量的试验推广, 目前研究集中在切顶卸压沿空留巷技术方面, 缺少对于倾向切顶卸压减小系统巷道保护煤柱的研究。为解决工作面回撤阶段巷道承载力大、两帮及顶板变形严重等问题, 提出预先在回撤通道顶板打切顶眼, 阻断落山侧应力传导, 以辛置煤矿2-20工作面为研究对象, 结合理论分析、数值模拟、现场实测方法对切顶钻孔关键参数进行研究。结果表明: 当切顶钻孔的仰角和深度分别为75°和9m时, 护巷煤柱应力峰值达到最小, 钻孔卸压效果明显, 巷道稳定性较好; 通过现场试验发现煤柱左侧最大位移量减60mm, 降幅14.46%, 右侧降幅33.71%, 对比相邻巷道围岩变形情况可知, 切顶钻孔对系统巷道起到较好的卸压保护效果。

关键词: 切顶卸压, 钻孔参数, 保护煤柱, 回撤工作面

Abstract:

To solve the problem of large bearing stress of the roadway, serious deformation of two gangs and roof in the retreating stage, roof cutting is proposed.Taking 2-203 as the research object,key parameters of the cutting hole are studied combined with theoretical analysis, numerical simulation and field tests.The results show that when the elevation angle and depth of the cutting hole are 75°and 9 m respectively, the stress peak of the coal pillar is smallest, the pressure relief effect is obvious, and the stability of the roadway is better. Through field tests, the deformation on the left side of the coal pillar decreased by 60 mm, a decrease of 14.46%, and the right side decreased by 33.71%.Compared with the deformation of adjacent roadway, roof cutting has a better pressure relief effect on the system roadway.

中图分类号:

TD325

熊巨, 杨天艺, 杨艳国. 回撤工作面倾向切顶卸压关键参数研究[J]. 煤炭工程, 2023, 55(8): 68-72.

参考文献

[1]何满潮，宋振骐，王安，等．长壁开采切顶短臂梁理论及其110工法——第三次矿业科学技术变革[J]. 煤炭科技，2017(01):1-9+13.
He Manchao, Song Zhenqi, Wang'an, et al. Theory of longwall mining by using roof cuting shortwall team and 110 method——the third mining science and technology reform [J]. Coal Science&Technology Magazine,2017 (01)
:1-9+13 .
[2]邢纪伟，冯酉森，邬剑明，等. 无煤柱沿空留巷支护技术[J]. 煤炭技术，2014, 33(10):120-123.
Xing Jiwei, Feng Yousen, Wu Jianming, et al. Support Technique of Gob-side Entry Retaining without Coal Pillar[J]. Coal Technology, 2014,33(10):120-123.
[3]张农，韩昌良，阚甲广，等．沿空留巷围岩控制理论与实践[J]．煤炭学报，2014, 39( 8) : 1635-1641．
Zhang Nong, Han Changliang, Kan Jiaguang, et al.Theory and practice of surrounding rock control for pillarless gob-side entry retaining[J]. Journal of China Coal Society, 2014,39(8):1635-1641.
[4]胡超文，王俊虎，何满潮，等. 中厚煤层切顶卸压无煤柱自成巷技术关键参数研究[J]. 煤炭科学技术, 2022, 50(04):117-123.
Hu Chaowen, Wang Junhu, He Manchao, et al.Study on key parameters of self-formed roadway without coal pillar by roof cutting and pressure relief in medium and thick coal seam[J]. Coal Science and Technology, 2022,50(04):117-123.
[5]高玉兵，甄恩泽，马资敏，等. 不同煤厚条件下切顶卸压无煤柱自成巷技术应用[J]. 煤矿安全, 2020, 51(09):168-173.
Gao Yubing, Zhen Enze, Ma Zimin, et al.Application of Nonpillar Mining Technique with Automatically Formed Entry by Roof Cutting and Pressure Release Under Different Coal Seam Thicknesses[J]. Safety in Coal Mine , 2020,51(09):168-173.
[6]梁洁，张磊，徐青云，等. 大采高采场切顶卸压小煤柱护巷技术研究与应用[J]. 矿业安全与环保, 2021, 48(03):79-84.
Liang Jie, Zhang Lei, Xu Qingyun, et al. Research and application on roadway protection technology of small coal pillar with pressure relief by roof cutting in pit with large mining height[J]. Mining safety＆Environmental Protection, 2021,48(03):79-84.
[7]李柱和，王利波，张志刚，等. 大采高工作面切顶卸压沿空掘巷的研究与应用[J]. 煤炭技术, 2022, 41(08):40-45.
Li Zhuhe, Wang Libo, Zhang Zhigang, et al. Research and Application of Roof Cutting and Pressure Relief Gob-side Entry Driving in Large Mining Height Face[J]. Coal Technology, 2022,41(08):40-45.
[8]任广信. 复杂薄煤层聚能爆破切顶卸压沿空留巷技术研究[J]. 煤炭技术, 2022, 41(05):17-22.
Ren Guangxin.Study on Roof Cutting and Pressure Relief Technology of Gob Side Entry Retaining by Shaped Charge Blasting in Complex Thin Coal Seam[J]. Coal Technology, 2022,41(05):17-22.
[9]杨军，王世彬，马小燕，等. 官地矿切顶卸压沿空留巷聚能爆破现场试验研究[J]. 煤炭工程, 2019, 51(02):28-31.
Yang Jun, Wang Shibin, Ma Xiaoyan, et al.Experimental Research on Blasting Parameters of Roof Cutting and Pressure Relieving Gob Side Entry Retaining in Guandi Coal Mine[J]. Coal Engineering, 2019,51(02):28-31.
[10]郑立军，王文，张广杰. 高应力综放工作面切顶卸压沿空留巷开采技术研究[J]. 河南理工大学学报(自然科学版), 2021, 40(06):43-53.
Zheng Lijun, Wang Wen, Zhang Guangjie.Study on the technology of gob-side entry retaining by roof cutting to release pressure in fully mechanized mining working face with high stress[J]. Journal of Henan Polytechnic University (Natural Science edition), 2021,40(06):43-53.
[11]朱文庆，郝兵元，刘世涛，等. 工作面末采段深孔预裂切顶护巷技术研究[J]. 煤炭工程, 2022, 54(05):97-103.
Zhu Wenqing, Hao Bingyuan, Liu itao, et al.Deep hole pre-split roof cutting and roadway protection in end mining of working face[J]. Coal Engineering, 2022,54(05):97-103.
[12]郭金刚，李耀晖，石松豪，等. 厚硬基本顶切顶卸压成巷及围岩控制技术[J]. 煤炭学报, 2021, 46(09):2853-2864.
Guo Jingang, Li Yaohui, Shi Songhao, et al.Self-forming roadway of roof cutting and surrounding rock control technology under thick and hard basic roof[J].Journal of China Coal Society, 2021,46(09):2853-2864.
[13]苏铭，姚强岭，刘梓昌，等. 链臂锯切顶卸压小煤柱留巷开采围岩稳定性分析[J]. 中国矿业, 2021, 30(07):146-151.
Su Ming, Yao Qiangling, Liu Zichang, et al. Analysis on stability of surrounding rock in small coal pillar roadway with chain arm sawing[J]. China Mining Magazine, 2021,30(07):146-151.
[14]李东印，张景轩，郑立军，等. 密集钻孔弱化底分层顶板沿空留巷技术[J]. 煤矿安全, 2022, 53(07):111-118+125.
Li Dongyin, Zhang Jingxuan, Zheng Lijun, et al.Dense boreholes for weakening bottom layer by cutting roof and pressure relief of gob-side entry retaining[J].Safety in Coal Mine, 2022,53(07):111-118+125.
[15]张金贵，浦仕江，闫亚楠，等. 切顶卸压对重复扰动条件下的煤柱稳定性影响分析[J]. 煤炭工程, 2021, 53(02):48-53.
Zhang Jingui, Pu Shijiang, Yan Yanan, et al.Influence of roof cutting pressure releasing on coal pillar stability under secondary disturbance[J]. Coal Engineering, 2021,53(02):48-53.
[16]杨军，王宏宇，王亚军，等. 切顶卸压无煤柱自成巷顶板断裂特征研究[J]. 采矿与安全工程学报, 2019, 36(06):1137-1144.
Yang Jun, Wang Hongyu, Wang Yajun, et al. Fracture characteristics of the roof in gob-side entry retaining with roof cutting and pressure release[J]. Journal of Mining＆Safety Engineering, 2019,36(06):1137-1144.
[17]吴志刚，褚晓威，石蒙．基于覆岩结构的沿空留巷充填体载荷估算方法［J］．煤炭工程，2018，50( 8) : 89－92．
Wu Zhigang, Chu Xiaowei, Shi Meng.Load estimating method of packing body for gob-side entry retaining based on overlying strata structure[J]. Coal Engineering, 2018,50(8):89-92.
[18]陈上元，赵波，袁越，等．城郊矿深部工作面切顶留巷工程试验研究［J］．采矿与安全工程学报，2021，38(1):121-129.
Chen Shangyuan, Zhao Bo, Yuan Yue, and et al. Engineering experiment on gob-side entry retaining by roof cutting of deep mining face in Chengjiao coalmine[J]. Journal of Mining＆Safety Engineering, 2021,38(1):121-129.
[19]郑立军．综放工作面沿空留巷定向预裂爆破技术研究［J］．煤炭工程，2021, 53(10):19-24.
Zheng Lijun. Application of directional presplitting blasting in gob side entry retaining in fully mechanized top-coal caving face[J]. Coal Engineering, 2021,53(10):19-24.
[20]胡超文，王俊虎，何满潮，等. 中厚煤层切顶卸压无煤柱自成巷技术关键参数研究[J]. 煤炭科学技术, 2022, 50(04):117-123.
Hu Chaowen, Wang Junhu, He Manchao, et al.Study on key parameters of self-formed roadway without coal pillar by roof cutting and pressure relief in medium and thick coal seam[J]. Coal Science and Technology, 2022,50(04):117-123.