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浙江大学学报(工学版)  2022, Vol. 56 Issue (12): 2445-2453    DOI: 10.3785/j.issn.1008-973X.2022.12.013
土木工程、水利工程     
分级循环荷载下保护层开采扰动煤岩强度及裂隙特性研究
杨永波1,2(),周哲1,*()
1. 重庆大学 煤矿灾害动力学与控制国家重点实验室,重庆 400044
2. 中煤科工集团重庆研究院有限公司,重庆 400037
Strength and fracture characteristics of coal rock disturbed by protective layer mining under graded cyclic loading
Yong-bo YANG1,2(),Zhe ZHOU1,*()
1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
2. Chongqing Research Institute, China Coal Technology and Engineering Group, Chongqing 400037, China
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摘要:

针对回采时反复采动作用下的保护层开采扰动煤岩极易诱发巷道围岩失稳的问题,采用分级循环荷载模拟实际回采工程中采动应力的长期作用,研究保护层开采扰动煤岩在循环荷载作用下的力学强度及变形破坏特性. 试验结果表明,在加卸载过程中,受保护层开采扰动煤样的体积膨胀变形明显,煤样内部结构破坏程度比未受保护层开采扰动煤样更高. 在加卸载后期,受保护层开采扰动煤样表现为塑性破坏,未受保护层开采扰动煤样发生明显的脆性破坏. 相比于未受保护层开采扰动煤样,受保护层开采扰动煤样的峰值强度下降,单位体积(直径为50 mm,高度为100 mm)内的煤样裂隙体积显著增加,峰值强度和裂隙体积占比均沿煤层走向分布较为均匀. 处于断层带的未受保护层开采扰动煤样的彼此物性差异较大. 受保护层开采扰动煤样比未受保护层开采扰动煤样更符合“煤岩破坏时,裂隙空间复杂程度与峰值强度存在反向对应分布”规律.

关键词: 开采扰动循环荷载峰值强度裂隙重构裂隙分布三维裂隙分形维数    
Abstract:

Aimed the coal rock disturbed by the protective layer mining under the action of repeated mining during the recovery was likely to induce the destabilization problem of the roadway surrounding rock, the graded cyclic loading was adopted to simulate the long-term effects of mining stresses in the actual recovery projects, to investigate the mechanical strength and deformation damage characteristics of coal rock disturbed by protective layer mining under graded cyclic loading. Results show that the volume expansion deformation of the coal samples disturbed by the protective layer mining under the process of loading and unloading is obvious, the internal structure damage degree of the coal samples is higher than that of the coal samples undisturbed by the protective layer mining. In the later stage of loading and unloading, the coal samples disturbed by the protective layer mining show plastic failure, while the coal samples disturbed by the protective layer mining show obvious brittle failure. Compared with the coal samples undisturbed by the protective layer mining, the peak strength of the coal samples disturbed by the protective layer mining decreases, the fracture volume of the coal samples per unit volume (50 mm diameter and 100 mm height) increases significantly, and both the peak intensity and fracture volume ratio are distributed more uniformly along the coal seam direction. The physical properties of the coal samples undisturbed by the protective layer mining in the fault zone differ greatly from each other. The coal samples disturbed by protective layer mining is more in line with the law of “there is an inverse corresponding distribution between the complexity of coal rock fractures and the peak strength when coal rock is destroyed” than that of coal samples undisturbed by protective layer mining.

Key words: mining disturbance    cyclic loading    peak strength    fracture reconstruction    fracture distribution    three-dimensional fracture fractal dimension
收稿日期: 2022-01-08 出版日期: 2023-01-03
CLC:  TD 18  
基金资助: 国家自然科学基金资助项目(51625401,51774055);中国平煤神马集团焦煤开发与综合利用国家重点实验室开放研究基金资助项目(41040220171106-1)
通讯作者: 周哲     E-mail: yangyongbocqu@163.com;zhouzhe@cqu.edu.cn
作者简介: 杨永波(1995—),男,工程师,硕士,从事煤岩采动力学及岩土力学研究. orcid.org/0000-0001-8944-4393. E-mail: yangyongbocqu@163.com
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引用本文:

杨永波,周哲. 分级循环荷载下保护层开采扰动煤岩强度及裂隙特性研究[J]. 浙江大学学报(工学版), 2022, 56(12): 2445-2453.

Yong-bo YANG,Zhe ZHOU. Strength and fracture characteristics of coal rock disturbed by protective layer mining under graded cyclic loading. Journal of ZheJiang University (Engineering Science), 2022, 56(12): 2445-2453.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2022.12.013        https://www.zjujournals.com/eng/CN/Y2022/V56/I12/2445

图 1  己14-31050和己15-31030煤层空间位置及样品制备
图 2  煤岩力学试验及裂隙扫描设备
图 3  煤样的分级循环加卸载示意图
图 4  距开切眼255 m的煤样偏应力-应变曲线
图 5  研究区煤体的峰值强度分布
图 6  煤样的裂隙三维重构及提取
图 7  距开切眼255 m的煤岩三维裂隙分形维数计算
L / m 是否受保护层
开采扰动
拟合线性方程 R2 D
96 $y = - 2.169\;6x+8.349\;6$ 0.9999 2.1696
96 $y=-1.996\;0x+8.119\;7$ 0.9998 1.9960
170 $y = - 2.181\;5x+8.453\;2$ 0.9994 2.1815
170 $y = - 1.916\;5x+7.842\;4$ 0.9987 1.9165
255 $y=-2.215\;2x+8.696\;4$ 0.9993 2.2152
255 $y = - 1.912\;1x+7.823\;8$ 0.9995 1.9121
389 $y = - 2.188\;4x+8.726\;4$ 0.9995 2.1884
389 $y = - 1.953\;6x+8.169\;4$ 0.9999 1.9536
495 $y = - 2.217\;8x+8.683\;9$ 0.9999 2.2178
495 $y = - 1.994\;0x+8.343\;6$ 0.9997 1.9940
640 $y = - 2.442\;8x+8.715\;3$ 0.9999 2.4428
640 $y = - 2.087\;5x+8.540\;3$ 0.9997 2.0875
680 $y = - 2.332\;9x+8.698\;1$ 0.9999 2.3329
680 $y = - 2.045\;2x+8.479\;0$ 0.9996 2.0452
834 $y = - 2.250\;6x+8.660\;7$ 0.9995 2.2506
834 $y = - 1.954\;1x+8.430\;1$ 0.9997 1.9541
表 1  煤样的三维裂隙分形维数
图 8  研究区煤体的裂隙体积分布
图 9  煤岩三维裂隙分形维数与峰值强度的对应分布规律
3 蒋长宝, 魏财, 庄万军, 等 等幅循环荷载下页岩的变形特性及能量演化机制研究[J]. 岩石力学与工程学报, 2020, 39 (12): 2416- 2428
JIANG Chang-bao, WEI Cai, ZHUANG Wan-jun, et al Research on deformation characteristics and energy evolution mechanisms of shale under constant amplitude cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39 (12): 2416- 2428
doi: 10.13722/j.cnki.jrme.2020.0451
4 吴再海, 宋朝阳, 谭杰, 等 不同分级循环加卸载模式下岩石能量演化规律研究[J]. 采矿与安全工程学报, 2020, 37 (4): 836- 844
WU Zai-hai, SONG Zhao-yang, TAN Jie, et al The evolution law of rock energy under different graded cyclic loading and unloading modes[J]. Journal of Mining and Safety Engineering, 2020, 37 (4): 836- 844
5 谢和平, 周宏伟, 刘建峰, 等 不同开采条件下采动力学行为研究[J]. 煤炭学报, 2011, 36 (7): 1067- 1074
XIE He-ping, ZHOU Hong-wei, LIU Jian-feng, et al Mining-induced mechanical behavior in coal seams under different mining layouts[J]. Journal of China Coal Society, 2011, 36 (7): 1067- 1074
doi: 10.13225/j.cnki.jccs.2011.07.025
6 谢和平, 张泽天, 高峰, 等 不同开采方式下煤岩应力场-裂隙场-渗流场行为研究[J]. 煤炭学报, 2016, 41 (10): 2405- 2417
XIE He-ping, ZHANG Ze-tian, GAO Feng, et al Stress-fracture-seep-age field behavior of coal under different mining layouts[J]. Journal of China Coal Society, 2016, 41 (10): 2405- 2417
doi: 10.13225/j.cnki.jccs.2016.1393
7 任伟光, 周宏伟, 薛东杰, 等 上保护层开采下煤岩强扰动力学行为与渗透特性[J]. 煤炭学报, 2019, 44 (5): 1473- 1481
REN Wei-guang, ZHOU Hong-wei, XUE Dong-jie, et al Mechanical behavior and permeability of coal and rock under strong mining disturbance in protected coal seam mining[J]. Journal of China Coal Society, 2019, 44 (5): 1473- 1481
doi: 10.13225/j.cnki.jccs.2019.6011
8 YIN G Z, LI M H, WANG J G, et al Mechanical behavior and permeability evolution of gas infiltrated coals during protective layer mining[J]. International Journal of Rock Mechanics and Mining Sciences, 2015, 80: 292- 301
doi: 10.1016/j.ijrmms.2015.08.022
9 LI Q M, LIANG Y P, ZOU Q L Seepage and damage evolution characteristics of gas-bearing coal under different cyclic loading–unloading stress paths[J]. Processes, 2018, 6 (10): 190
doi: 10.3390/pr6100190
1 YAO B H, MA Q Q, WEI J P, et al Effect of protective coal seam mining and gas extraction on gas transport in a coal seam[J]. International Journal of Mining Science and Technology, 2016, 26 (4): 637- 643
doi: 10.1016/j.ijmst.2016.05.016
2 彭高友, 高明忠, 吕有厂, 等 深部近距离煤层群采动力学行为探索[J]. 煤炭学报, 2019, 44 (7): 1971- 1980
doi: 10.13225/j.cnki.jccs.2018.1206
10 许江, 刘东, 尹光志, 等 非均布荷载条件下煤与瓦斯突出模拟实验[J]. 煤炭学报, 2012, 37 (5): 836- 842
XU Jiang, LIU Dong, YIN Guang-zhi, et al Simulation experiment of coal and gas outburst under non-uniform load[J]. Journal of China Coal Society, 2012, 37 (5): 836- 842
doi: 10.13225/j.cnki.jccs.2012.05.026
2 PENG Gao-you, GAO Ming-zhong, LÜ You-chang, et al Investigation on mining mechanics behavior of deep close distance seam group[J]. Journal of China Coal Society, 2019, 44 (7): 1971- 1980
doi: 10.13225/j.cnki.jccs.2018.1206
11 张振宇, 钟春林, 薛康生, 等 循环外载激发下孔隙流体对煤岩动力灾害孕育的力学作用机制[J]. 煤炭学报, 2021, 46 (2): 466- 476
ZHANG Zhen-yu, ZHONG Chun-lin, XUE Kang-sheng, et al Mechanical mechanism of pore fluid on coal dynamic disasters under cyclic loading[J]. Journal of China Coal Society, 2021, 46 (2): 466- 476
doi: 10.13225/j.cnki.jccs.xr20.1893
12 朱卓慧, 冯涛, 宫凤强, 等 煤岩组合体分级循环加卸载力学特性的实验研究[J]. 中南大学学报:自然科学版, 2016, 47 (7): 2469- 2475
ZHU Zhuo-hui, FENG Tao, GONG Feng-qiang, et al Experimental research of mechanical properties on grading cycle loading-unloading behavior of coal-rock combination bodies at different stress level[J]. Journal of Central South University: Science and Technology, 2016, 47 (7): 2469- 2475
13 许江, 李波波, 周婷, 等 循环荷载作用下煤变形及渗透特性的试验研究[J]. 岩石力学与工程学报, 2014, 33 (2): 225- 234
XU Jiang, LI Bo-bo, ZHOU Ting, et al Experimental study of deformation and seepage characteristics of coal under cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33 (2): 225- 234
14 DUAN M K, JIANG C B, XING H L, et al Study on damage of coal based on permeability and load-unload response ratio under tiered cyclic loading[J]. Arabian Journal of Geosciences, 2020, 13: 250
doi: 10.1007/s12517-020-5249-4
15 YANG X L, CAO J, CHENG X Y, et al Mechanical response characteristics and permeability evolution of coal samples under cyclic loading[J]. Energy Science and Engineering, 2019, 7 (5): 1588- 1604
doi: 10.1002/ese3.368
16 李晓泉, 尹光志, 蒋长宝, 等 阶段性循环载荷对突出煤样渗透特性的影响[J]. 重庆大学学报, 2012, 35 (1): 110- 116
LI Xiao-quan, YIN Guang-zhi, JIANG Chang-bao, et al Effect of ourburst coal’s gas seepage properties under stage cyclic loading[J]. Journal of Chongqing University, 2012, 35 (1): 110- 116
doi: 10.11835/j.issn.1000-582X.2012.01.021
17 SONG D Z, WANG E Y, LI Z H, et al Energy dissipation of coal and rock during damage and failure process based on EMR[J]. International Journal of Mining Science and Technology, 2015, 25 (5): 787- 795
doi: 10.1016/j.ijmst.2015.07.014
18 刘忠玉, 董旭, 张旭阳 分级循环荷载下层理煤岩力学特性试验研究[J]. 岩石力学与工程学报, 2021, 40 (Suppl.1): 2593- 2602
LIU Zhong-yu, DONG Xu, ZHANG Xu-yang Experimental study on mechanical properties of bedding coal and rock under graded cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering, 2021, 40 (Suppl.1): 2593- 2602
doi: 10.13722/j.cnki.jrme.2020.0643
19 刘毅. 分级循环荷载下丁字形裂隙试样的力学特性及其损伤规律实验研究 [D]. 西安: 西安理工大学, 2020.
LIU Yi. Experimental study on mechanical properties and damage law of T-shaped cracked sample under multi-level cycling loading [D]. Xi’an: Xi’an University of Technology, 2020.
20 中华人民共和国国土资源部. 岩石物理力学性质试验规程: 第18部分 岩石单轴抗压强度试验: DZ/T 0276.18-2015[S]. 北京: 中国标准出版社, 2015: 2.
21 张晖辉, 颜玉定, 余怀忠, 等 循环载荷下大试件岩石破坏声发射实验——岩石破坏前兆的研究[J]. 岩石力学与工程学报, 2004, 23 (21): 3621- 3628
ZHANG Hui-hui, YAN Yu-ding, YU Huai-zhong, et al Acoustic emission experimental research on large-scaled rock failure under cycling load——fracture precursor of rock[J]. Chinese Journal of Rock Mechanics and Engineering, 2004, 23 (21): 3621- 3628
doi: 10.3321/j.issn:1000-6915.2004.21.011
22 邹俊鹏, 陈卫忠, 杨典森, 等. 循环荷载条件下原煤力学性质及损伤演化规律[J]. 煤炭学报, 2016, 41(7): 1675-1682.
ZOU Jun-peng, CHEN Wei-zhong, YANG Dian-sen, et al. Mechanical properties and damage evolution of coal under cyclic loading conditions [J]. Journal of China Coal Society, 2016, 41(7): 1675–1 682.
23 孔德中, 杨胜利, 张锦旺, 等 煤样强度特征的浆液量效应试验研究[J]. 采矿与安全工程学报, 2015, 32 (3): 420- 425
KONG De-zhong, YANG Sheng-li, ZHANG Jin-wang, et al The experimental study of the grout quantity effect of strength properties of coal sample[J]. Journal of Mining and Safety Engineering, 2015, 32 (3): 420- 425
doi: 10.13545/j.cnki.jmse.2015.03.012
24 WAWERSIK W R, FAIRHURST C A study of brittle rock fracture in laboratory compression experiments[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts, 1970, 7 (5): 561- 575
doi: 10.1016/0148-9062(70)90007-0
25 王超圣, 周宏伟, 王子辉, 等 不同应力状态下北山花岗岩岩爆倾向性研究[J]. 工程科学与技术, 2017, 49 (6): 84- 90
WANG Chao-sheng, ZHOU Hong-wei, WANG Zi-hui, et al Investigation on the rockburst proneness pf Beishan granite under different stress state[J]. Advanced Engineering Sciences, 2017, 49 (6): 84- 90
26 左建平, 谢和平, 孟冰冰, 等 煤岩组合体分级加卸载特性的试验研究[J]. 岩石力学, 2011, 32 (5): 1287- 1296
ZUO Jian-ping, XIE He-ping, MENG Bing-bing, et al Experimental research on loading-unloading behavior of coal-rock combination bodies at different stress levels[J]. Rock and Soil Mechanics, 2011, 32 (5): 1287- 1296
27 尤明庆, 苏承东 大理岩试样循环加载强化作用的试验研究[J]. 固体力学学报, 2008, 29 (1): 66- 72
YOU Ming-qing, SU Cheng-dong Experimental study on strengthe- ning of marble specimen in cyclic loading of uniaxial or pseudo-triaxial compression[J]. Chinese Journal of Solid Mechanics, 2008, 29 (1): 66- 72
doi: 10.19636/j.cnki.cjsm42-1250/o3.2008.01.010
28 徐速超, 冯夏庭, 陈炳瑞 矽卡岩单轴循环加卸载试验及声发射 特性研究[J]. 岩土力学, 2009, 30 (10): 2929- 2934
XU Su-chao, FENG Xia-ting, CHEN Bing-rui Experimental study of skarn under uniaxial cyclic loading and unloading test and acoustic emission characteristics[J]. Rock and Soil Mechanics, 2009, 30 (10): 2929- 2934
doi: 10.3969/j.issn.1000-7598.2009.10.006
29 杨永波 上保护层开采下原煤孔隙结构及损伤破坏特征研究[J]. 矿业研究与开发, 2021, 41 (9): 74- 79
YANG Yong-bo Study on pore structure and damage and failure characteristics of raw coal under upper protective layer mining[J]. Mining Research and Development, 2021, 41 (9): 74- 79
doi: 10.13827/j.cnki.kyyk.2021.09.014
30 赵小平, 裴建良, 戴峰, 等 裂隙岩体内3维裂隙体的分形描述[J]. 四川大学学报: 工程科学版, 2014, 46 (6): 95- 100
ZHAO Xiao-ping, PEI Jian-liang, DAI Feng, et al Fractal description of cracks in rock mass[J]. Journal of Sichuan University: Engineering Sciences Edition, 2014, 46 (6): 95- 100
31 毛灵涛, 连秀云, 郝丽娜 基于数字体图像三维裂隙的分形计算及应用[J]. 中国矿业大学学报, 2014, 43 (6): 1134- 1139
MAO Ling-tao, LIAN Xiu-yun, HAO Li-na The fractal calculation of 3D cracks based on digital volumetric images and its application[J]. Journal of China University of Mining and Technology, 2014, 43 (6): 1134- 1139
doi: 10.13247/j.cnki.jcumt.000249
32 杨更社, 刘慧 基于CT图像处理技术的岩石损伤特性研究[J]. 煤炭学报, 2007, 32 (5): 463- 468
YANG Gen-she, LIU Hui Study on the rock damage characteristics based on the technique of CT image processing[J]. Journal of China Coal Society, 2007, 32 (5): 463- 468
doi: 10.3321/j.issn:0253-9993.2007.05.004
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