| Citation: |
LAI Xingping，XU Lizhen，CAO Jiantao，et al. Instability characteristics and control methods of small coal pillar in open roadway under the influence of mining[J]. Coal Science and Technology，2025，53（1）：39−53. DOI: 10.12438/cst.2024-1628
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The coal base in western China is the core “ballast stone” of China’s energy security. In order to improve the resource recovery rate, the stability of small coal pillar open roadway is widely used. In this paper, the mechanical model of small coal pillar open roadway is established in Meiduoshan Coal Mine of National Energy Group, and the correlation between the surrounding rock subsidence of small coal pillar and the supporting force of small coal pillar is quantified. The identification model of coal pillar stability is established by using naive Bayes model to judge the stability of coal pillar before and after regulation. Through the refined three-dimensional numerical calculation, the regulation effect of small coal pillar surrounding rock in open roadway is studied, and the field implementation is verified. The results show that there is a negative correlation between the maximum subsidence of the direct roof of the open roadway and the supporting strength of the small coal pillar by constructing four kinds of overlying rock structures at different fault lines. It shows that the subsidence of direct roof can be controlled by increasing the strength of small coal pillar, and the instability of surrounding rock of roadway can be improved. A coal pillar stability identification model was established based on naive Bayes and 11 surrounding rock parameters, and the accuracy of Ac reached 0.953 7, which met the identification requirements. The original coal pillar and the modified coal pillar are identified, and the feasibility of the control scheme is proved from the algorithm point of view. Through FLAC3D numerical simulation before and after the coordinated control scheme of surrounding rock modification, the stress value of coal pillar is increased by 57.6%, and the deformation is reduced by 22.8%. The stress of the supporting body is reduced, and the maximum displacement is reduced by 31.2%. The stress difference between the two sides decreases, and the stress distribution of roadway surrounding rock becomes more balanced. The in-situ implementation of the scheme can increase the maximum stress of coal pillar to 2.325 times, and the stress fluctuation is stable, and the deformation of roof and two sides is reduced by more than 80%. The feasibility of the coordinated control scheme of surrounding rock modification to prevent and control the deformation and failure of small coal pillar open-air roadway is verified, and the stability of surrounding rock is ensured. The research results provide basic support for the scientific design of small coal pillars in open roadway in western mining area, and provide reference for the prevention and control of the instability of open roadway with small coal pillars in western mining area.
| [1] |
谢和平,任世华,谢亚辰,等. 碳中和目标下煤炭行业发展机遇[J]. 煤炭学报,2021,46(7):2197−2211.
XIE Heping,REN Shihua,XIE Yachen,et al. Development opportunities of the coal industry towards the goal of carbon neutrality[J]. Journal of China Coal Society,2021,46(7):2197−2211.
|
| [2] |
来兴平,杨毅然,单鹏飞,等. 急斜煤层顶板应力叠加效应致灾特征综合分析[J]. 煤炭学报,2018,43(1):70−78.
LAI Xingping,YANG Yiran,SHAN Pengfei,et al. Comprehensive analysis of disaster-causing characteristics of roof stress superimposed effect in steeply inclined coal seams[J]. Journal of China Coal Society,2018,43(1):70−78.
|
| [3] |
潘一山,代连朋. 煤矿冲击地压发生理论公式[J]. 煤炭学报,2021,46(3):789−799.
PAN Yishan,DAI Lianpeng. Theoretical formula for rock burst occurrence in coal mines[J]. Journal of China Coal Society,2021,46(3):789−799.
|
| [4] |
来兴平,方贤威. “双碳” 目标驱动西部煤炭分阶控碳减熵增效与协同发展路径[J]. 西安科技大学学报,2022,42(5):841−848.
LAI Xingping,FANG Xianwei. Exploration of carbon control,entropy reduction,efficiency increase and their coordinated development for coal in Western China under“Dual Carbon” target[J]. Journal of Xi’an University of Science and Technology,2022,42(5):841−848.
|
| [5] |
许峰,靳德武,高振宇,等. 煤炭高强度重复采动下地下水资源漏失规律研究[J]. 煤炭科学技术,2022,50(11):131−139.
XU Feng,JIN Dewu,GAO Zhenyu,et al. Study on law of groundwater resources leakage under high intensity repeated mining[J]. Coal Science and Technology,2022,50(11):131−139.
|
| [6] |
彭苏萍,毕银丽. 西部干旱半干旱煤矿区生态环境损伤特征及修复机制[J]. 煤炭学报,2024,49(1):57−64.
PENG Suping,BI Yinli. Properties of ecological environment damage and their mechanism of restoration in arid and semi-arid coal mining area of western China[J]. Journal of China Coal Society,2024,49(1):57−64.
|
| [7] |
谢生荣,王恩,陈冬冬,等. 深部强采动大断面煤巷围岩外锚–内卸协同控制技术[J]. 煤炭学报,2022,47(5):1946−1957.
XIE Shengrong,WANG En,CHEN Dongdong,et al. Collaborative control technology of external anchor-internal unloading of surrounding rock in deep large-section coal roadway under strong mining influence[J]. Journal of China Coal Society,2022,47(5):1946−1957.
|
| [8] |
代连朋. 巷道冲击地压发生的应力与能量条件研究及应用[D]. 沈阳:东北大学,2022.
DAI Lianpeng. Study and application of stress and energy conditions for rock burst in roadway[D]. Shenyang:Northeastern University,2022.
|
| [9] |
许慧聪,来兴平,单鹏飞,等. 深部煤岩动力灾害多场耦合试验系统研制及应用[J/OL]. 岩石力学与工程学报,1−14[2025−01−07]. http://kns.cnki.net/kcms/detail/42.1397.o3.20241201.2038.001.html.
XU Huicong,LAI Xingping,SHAN Pengfei,et al. Development and Application of a Multi-field Coupling Experimental System for Dynamic Disasters of Deep Coal and Rock [J/OL]. Chinese Journal of Rock Mechanics and Engineering,1–14[2025−01−07]. http://kns.cnki.net/kcms/detail/42.1397.o3.20241201.2038.001.html.
|
| [10] |
赵庆冲,涂敏,付宝杰,等. 采动影响下底板岩体及巷道破坏时空演化特征分析[J]. 煤炭科学技术,2024,52(4):302−313.
ZHAO Qingchong,TU Min,FU Baojie,et al. Analysis of spatiotemporal evolution characteristics of floor rock mass and roadway failure under mining influence[J]. Coal Science and Technology,2024,52(4):302−313.
|
| [11] |
霍丙杰,孟繁禄,李天航,等. 多层坚硬顶板特厚煤层综放工作面小煤柱护巷技术[J]. 煤炭科学技术,2024,52(3):13−23.
HUO Bingjie,MENG Fanlu,LI Tianhang,et al. Small coal pillar technology in fully-mechanized top-coal caving face of multi layer hard roof and extra thick coal seam[J]. Coal Science and Technology,2024,52(3):13−23.
|
| [12] |
韩刚,王黔,吕玉磊. 区段煤柱对沿空巷道动力显现影响机制研究[J]. 煤炭科学技术,2022,50(S2):153−159.
HAN Gang,WANG Qian,LYU Yulei. Study on influence mechanism of width of sectional coal pillar on rockburst of gob-side roadway[J]. Coal Science and Technology,2022,50(S2):153−159.
|
| [13] |
周礼杰,陈亮,程志恒,等. 突出厚煤层沿空掘巷煤柱留设宽度优化研究[J]. 煤炭科学技术,2022,50(3):92−101.
ZHOU Lijie,CHEN Liang,CHENG Zhiheng,et al. Study on optimization of coal pillar width of gob-side entry driving in thick coal seam with gas outburst[J]. Coal Science and Technology,2022,50(3):92−101.
|
| [14] |
魏启明,赵俊杰,王虎,等. 小煤柱巷道围岩变形的力学机理及演化过程研究[J]. 中国安全生产科学技术,2023,19(3):73−78.
WEI Qiming,ZHAO Junjie,WANG Hu,et al. Study on mechanical mechanism and evolution process of surrounding rock deformation in small coal pillar roadway[J]. Journal of Safety Science and Technology,2023,19(3):73−78.
|
| [15] |
贾川,胡成成. 厚煤层沿空掘巷围岩失稳机制及控制技术[J]. 采矿与岩层控制工程学报,2020,2(4):38−45.
JIA Chuan,HU Chengcheng. Instability mechanism and control technology of longwall entries driving along the gob in a thick coal seam[J]. Journal of Mining and Strata Control Engineering,2020,2(4):38−45.
|
| [16] |
孙福玉. 综放开采窄煤柱沿空掘巷围岩失稳机理与控制技术[J]. 煤炭科学技术,2018,46(10):149−154.
SUN Fuyu. Instability mechanism and control technology of surrounding rock of gob-side entry with narrow pillar by fully-mechanized caving mining[J]. Coal Science and Technology,2018,46(10):149−154.
|
| [17] |
李伟涛,郭志飚,何满潮,等. 深部高应力软岩巷道失稳机理及补偿支护技术研究[J/OL]. 煤炭科学技术,1–18[2025−01–07] . http://kns.cnki.net/kcms/detail/11.2402.td.20240806.0947.002.html.
LI Weitao,GUO Zhibiao,HE Manchao,et al. Research on the instability mechanism and compensation support technology of deep high-stress soft rock roadways [J/OL]. Coal Science and Technology,1–18[2025–01–07] . http://kns.cnki.net/kcms/detail/11.2402.td.20240806.0947.002.html.
|
| [18] |
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 conditions[J]. Coal Science and Technology,2022,50(6):29−45.
|
| [19] |
侯朝炯,马念杰. 煤层巷道两帮煤体应力和极限平衡区的探讨[J]. 煤炭学报,1989,14(4):21−29.
HOU Chaojiong,MA Nianjie. Stress in in-seam roadway sides and limit equilibrium zone[J]. Journl of China Coal Society,1989,14(4):21−29.
|
| [20] |
孙恒虎,吴健,邱运新. 沿空留巷的矿压规律及岩层控制[J]. 煤炭学报,1992,17(1):15−24.
SUN Henghu,WU Jian,QIU Yunxin. Rules of ground pressure and strata control in gateways maintained in goaf[J]. Journal of China Coal Society,1992,17(1):15−24.
|
| [21] |
QI Taiyue,MA Nianjie. Requirement of fluidity of high water content materials for the getway-side backfilling technique[J]. Journal of China University of Mining & Technology,1996,6(2):81−90.
|
| [22] |
樊克恭,蒋金泉. 弱结构巷道围岩变形破坏与非均称控制机理[J]. 中国矿业大学学报,2007,36(1):54−59.
FAN Kegong,JIANG Jinquan. Deformation failure and non-harmonious control mechanism of surrounding rocks of roadways with weak structures[J]. Journal of China University of Mining & Technology,2007,36(1):54−59.
|
| [23] |
赵志强,马念杰,刘洪涛,等. 巷道蝶形破坏理论及其应用前景[J]. 中国矿业大学学报,2018,47(5):969−978.
ZHAO Zhiqiang,MA Nianjie,LIU Hongtao,et al. A butterfly failure theory of rock mass around roadway and its application prospect[J]. Journal of China University of Mining & Technology,2018,47(5):969−978.
|
| [24] |
吴锋锋,谷浩源,杨培举,等. 深部软岩大变形巷道变径分区卸压围岩控制技术及应用[J/OL]. 煤炭科学技术,1–13[2025–01–07] . http://kns.cnki.net/kcms/detail/11.2402.td.20240513.0815.001.html.
WU Fengfeng,GU Haoyuan,YANG Peiju,et al. Variable-diameter zoned pressure-relief surrounding rock control technology and its application for deep soft rock roadways with large deformations [J/OL]. Coal Science and Technology,1–13[2025–01–07] . http://kns.cnki.net/kcms/detail/11.2402.td.20240513.0815.001.html.
|
| [25] |
LU Y L,WANG L G,LI Z L,et al. Experimental study on the shear behavior of regular sandstone joints filled with cement grout[J]. Rock Mechanics and Rock Engineering,2017,50(5):1321−1336. doi: 10.1007/s00603-016-1154-2
|
| [26] |
LEE J S,BANG C S,MOK Y J,et al. Numerical and experimental analysis of penetration grouting in jointed rock masses[J]. International Journal of Rock Mechanics and Mining Sciences,2000,37(7):1027−1037. doi: 10.1016/S1365-1609(00)00040-X
|
| [27] |
FENG H,ZHANG X M,ZHOU X S,et al. Experimental study on the compression behavior of grouted rock with bi-directional penetrating crack[J]. Applied Sciences,2021,11(2):537. doi: 10.3390/app11020537
|
| [28] |
LE H L,SUN S R,ZHU F,et al. Experimental investigation on failure modes and mechanical properties of rock-like specimens with a grout-infilled flaw under triaxial compression[J]. Shock and Vibration,2019,2019(1):4909534. doi: 10.1155/2019/4909534
|
| [29] |
LIU Q S,LEI G F,PENG X X,et al. Rheological characteristics of cement grout and its effect on mechanical properties of a rock fracture[J]. Rock Mechanics and Rock Engineering,2018,51(2):613−625. doi: 10.1007/s00603-017-1340-x
|
| [30] |
代晶晶. 强采动下区段煤柱稳定性智能辨识及调控[D]. 西安:西安科技大学,2021.
DAI Jingjing. Intelligent identification and regulation of coal pillar stability under strong mining[D]. Xi’an:Xi’an University of Science and Technology,2021.
|
| [31] |
孙嘉豪,王文杰,解联库. 基于微震监测和概率优化朴素贝叶斯的短期岩爆预测模型[J]. 岩土力学,2024,45(6):1884−1894.
SUN Jiahao,WANG Wenjie,XIE Lianku. Short-term rockburst prediction model based on microseismic monitoring and probability optimization naive Bayes[J]. Rock and Soil Mechanics,2024,45(6):1884−1894.
|
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