Deformation and Breakage Characteristics of Granular Gangue in Confined Compression Process

Abstract

Abstract: The main sources of macroscopic deformation of granular gangue are the direct compression of the initial pores of the sample during the confined loading process and the refilling of pores after the crushing of coarse gangue in the compaction stage. An experimental system combining loading installation with acoustic emission device was adopted, and the loading rate was taken as influencing factor. Based on theoretical derivation and experimental data analysis, the macroscopic deformation, porosity and breakage degree of granular gangue in the confined compression process were systematically studied. The results show that the direct compression of initial pores has the most obvious effect on the macroscopic deformation. The porosity increases with the decrease of strain and decreases with the decrease of stress in an inversely proportional composite function. The breakage fractal function of granular gangue is rededuced. By comparing the slope of logarithmic curve, it is found that the higher the loading rate is, the smaller the breakage degree is. The acoustic emission location number increases with the increase of test force, but decreases with the increase of loading rate. The particle fragmentation in the middle of the sample is the most intensive. The larger the degree of particle breakage is, the higher the secondary filling rate of pores is. The pores are not easy to be further compressed, and the anti-deformation ability of the sample is enhanced.

Key words: granular gangue, confined compression, macroscopic deformation, porosity, breakage characteristic, acoustic emission location

CLC Number:

TD823

XIAO Bo, LI Yongliang, LI Jin, WANG Yuxuan, WANG Zixu. Deformation and Breakage Characteristics of Granular Gangue in Confined Compression Process[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4002-4010.

References

[1] 刘建功,李新旺,何团.我国煤矿充填开采应用现状与发展[J].煤炭学报,2020,45(1):141-150.
LIU J G, LI X W, HE T. Application status and prospect of backfill mining in Chinese coal mines[J]. Journal of China Coal Society, 2020, 45(1): 141-150 (in Chinese).
[2] 刘建功,王翰秋,赵家巍.煤矿固体充填采煤技术发展回顾与展望[J].煤炭科学技术,2020,48(9):27-38.
LIU J G, WANG H Q, ZHAO J W. Review and prospect of development of solid backfill technology in coal mine[J]. Coal Science and Technology, 2020, 48(9): 27-38 (in Chinese).
[3] 张吉雄,巨峰,李猛,等.煤矿矸石井下分选协同原位充填开采方法[J].煤炭学报,2020,45(1):131-140.
ZHANG J X, JU F, LI M, et al. Method of coal gangue separation and coordinated in situ backfill mining[J]. Journal of China Coal Society, 2020, 45(1): 131-140 (in Chinese).
[4] 张吉雄,缪协兴,郭广礼.矸石(固体废物)直接充填采煤技术发展现状[J].采矿与安全工程学报,2009,26(4):395-401.
ZHANG J X, MIAO X X, GUO G L. Development status of backfilling technology using raw waste in coal mining[J]. Journal of Mining & Safety Engineering, 2009, 26(4): 395-401 (in Chinese).
[5] 肖猛,巨峰,何泽全,等.矸石充填材料侧压系数影响因素试验研究[J].采矿与安全工程学报,2020,37(1):73-80.
XIAO M, JU F, HE Z Q, et al. Experimental study on influence factors of the lateral pressure coefficient of gangue back-filling materials[J]. Journal of Mining & Safety Engineering, 2020, 37(1): 73-80 (in Chinese).
[6] PAPPAS D M, MARK C. Load deformation behavior of simulated longwall gob material[C]//Proceedings of the 12th International Conference on Ground Control in Mining. Morgantown, West Virginia: West Virginia University, 1993: 184-193.
[7] 马丹,白海波,陈占清,等.侧限压缩下破碎矸石混合粒径非Darcy流渗透特性[J].采矿与安全工程学报,2016,33(4):747-753.
MA D, BAI H B, CHEN Z Q, et al. Non-Darcy seepage properties of mixture particles of crushed gangue under confined compression[J]. Journal of Mining & Safety Engineering, 2016, 33(4): 747-753 (in Chinese).
[8] 李建平,郑克洪,杜长龙.煤和矸石的冲击破碎粒度分布特性[J].煤炭学报,2013,38(s1):54-58.
LI J P, ZHENG K H, DU C L. The distribution discipline of impact crushed on coal and gangue[J]. Journal of China Coal Society, 2013, 38(s1): 54-58 (in Chinese).
[9] 辛恒奇,黄艳利,张卫清,等.侧限压缩条件下矸石变形破碎规律及声发射特征研究[J].采矿与安全工程学报,2020,37(1):162-168.
XIN H Q, HUANG Y L, ZHANG W Q, et al. Research on deformation and crushing rules and acoustic emission characteristics of gangue bulk under the condition of confined compression[J]. Journal of Mining & Safety Engineering, 2020, 37(1): 162-168 (in Chinese).
[10] ZHOU N, HAN X L, ZHANG J X, et al. Compressive deformation and energy dissipation of crushed coal gangue[J]. Powder Technology, 2016, 297: 220-228.
[11] 程爱平,舒鹏飞,张玉山,等.充填体-围岩组合体声发射特征与损伤本构研究[J].采矿与安全工程学报,2020,37(6):1238-1245.
CHENG A P, SHU P F, ZHANG Y S, et al. Acoustic emission characteristics and damage constitution of backfill-surrounding rock combination[J]. Journal of Mining & Safety Engineering, 2020, 37(6): 1238-1245 (in Chinese).
[12] 裴向军,朱凌,崔圣华,等.加卸载条件下含缺陷岩石声发射响应特征研究[J].岩石力学与工程学报,2020,39(s1):2602-2611.
PEI X J, ZHU L, CUI S H, et al. Experimental study on acoustic emission characteristic of rocks with vein mass[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(s1): 2602-2611 (in Chinese).
[13] 杨逾,王冰芬,郑志明.煤矿矸石充填材料压实耗能特性试验研究[J].硅酸盐通报,2016,35(11):3511-3516.
YANG Y, WANG B F, ZHENG Z M. Experimental investigation on compaction energy dissipation of coal gangue filling material[J]. Bulletin of the Chinese Ceramic Society, 2016, 35(11): 3511-3516 (in Chinese).
[14] 姚苏琴,查文华,刘新权,等.萍乡废弃煤矸石理化特性及热活化性能研究[J].硅酸盐通报,2021,40(7):2280-2287.
YAO S Q, ZHA W H, LIU X Q, et al. Physicochemical and thermal activation properties of waste coal gangue in Pingxiang mining area[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(7): 2280-2287 (in Chinese).
[15] 黄星浩,张欣,李哲,等.基于富勒及泰波理论的机制砂颗粒级配研究[J].混凝土,2019(4):97-101.
HUANG X H, ZHANG X, LI Z, et al. Study on grain com position of manufactured sand on basis of Fullerand Tabortheory[J]. Concrete, 2019(4): 97-101 (in Chinese).
[16] 谢和平.分形-岩石力学导论[M].北京:科学出版社,1996:112-116.
XIE H P. Introduction of the fractals-rock mechanics[M]. Beijing: Science Press, 1996: 112-116 (in Chinese).
[17] 郑克洪,杜长龙,邱冰静.煤矸破碎粒度分布规律的分形特征试验研究[J].煤炭学报,2013,38(6):1089-1094.
ZHENG K H, DU C L, QIU B J. Experimental study on the fractal characteristics of crushing coal and gangue[J]. Journal of China Coal Society, 2013, 38(6): 1089-1094 (in Chinese).
[18] 刘展.煤矿矸石压实力学特性及其在充填采煤中的应用[D].徐州:中国矿业大学,2014.
LIU Z. Compaction properties of gangue and its application in backfilling coal mining[D]. Xuzhou: China University of Mining and Technology, 2014 (in Chinese).
[19] 潘兆科,刘志河.矸石破碎块度的分形性质及计算方法[J].太原理工大学学报,2004,35(2):115-117.
PAN Z K, LIU Z H. Fractal properties of size distribution of gangue agmentation and routine calculation[J]. Journal of Taiyuan University of Technology, 2004, 35(2): 115-117 (in Chinese).
[20] 孔国强.破碎矸石侧限压缩过程的声发射特征研究[D].徐州:中国矿业大学,2019.
KONG G Q. Study on acoustic emission characteristics of crushed gangues during confined compaction[D]. Xuzhou: China University of Mining and Technology, 2019 (in Chinese).
[21] 安定超,张盛,张旭龙,等.岩石断裂过程区孕育规律与声发射特征实验研究[J].岩石力学与工程学报,2021,40(2):290-301.
AN D C, ZHANG S, ZHANG X L, et al. Experimental study on incubation and acoustic emission characteristics of rock fracture process zones[J]. Chinese Journal of Rock Mechanics and Engineering, 2021, 40(2): 290-301 (in Chinese).