Re-Crushing Evolution Characteristics of Broken Rock Samples with Different Particle Sizes in Goaf during Compaction

Zhang Cun; Chen Yanhong; Zhao Xiangyu; Wang Fangtian

doi:10.20174/j.JUSE.2025.S1.15

Chinese Journal of Underground Space and Engineering >

2025 , Vol. 21 >Issue S1: 117 - 129

DOI: https://doi.org/10.20174/j.JUSE.2025.S1.15

Re-Crushing Evolution Characteristics of Broken Rock Samples with Different Particle Sizes in Goaf during Compaction

Zhang Cun ,
Chen Yanhong ,
Zhao Xiangyu ,
Wang Fangtian

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1. Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology-Beijing, Beijing 100083, P. R. China;
2. Engineering Research Center of Green and Intelligent Mining for Thick Coal Seam, Ministry of Education, China University of Mining and Technology-Beijing, Beijing 100083, P. R. China;
3. School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

Received date: 2025-01-19

Online published: 2025-09-03

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Abstract

The compaction and re-crushing characteristics of broken rock samples (BRS) in the goaf caving zone directly influence the seepage characteristics in the goaf, mining pressure on the longwall face, and surface subsidence. To study the compaction and re-crushing characteristics of BRS with different particle sizes, the experiment of BRS compaction considering particle size was carried out with the help of acoustic emission (AE) monitoring system. The experimental results indicate that BRS with larger particle sizes release more energy and have a higher number of re-crushing when subjected to the same loading stress. But the smaller the corresponding stress under the same strain conditions of the larger particle sizes. On the basis, a stress-strain model for BRS compaction considering particle size was developed. The cumulative count and energy of AE from BRS continue to increase during the broken stage. The larger the particle size, the more AE events occur. Re-crushing of BRS is mainly characterized by tensile failure. As stress increases, the proportion of shear failure continues to decrease. However, larger particle sizes show a higher proportion of shear failure. The b-value of AE indicates that the BRS undergoes a process of stable crack development during re-crushing. The acoustic emission localization experiment shows that the re-crushing of particles occurs as layered breakage in the vertical direction and uniform breakage in the horizontal direction. Horizontally, breakage starts in the boundary area and spreads evenly to the central area. Vertically, the upper layer breaks first, followed by the middle and lower layers. The research results have certain guiding significance for the overlying rock strata and surface movement, control of mining pressure manifestation, and safety management of goaf.

Key words： caving zone; broken rock samples; particle size; acoustic emission; damage mechanism

Cite this article

Zhang Cun , Chen Yanhong , Zhao Xiangyu , Wang Fangtian . Re-Crushing Evolution Characteristics of Broken Rock Samples with Different Particle Sizes in Goaf during Compaction[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(S1) : 117 -129 . DOI: 10.20174/j.JUSE.2025.S1.15

References

[1] Barbato J,Hebblewhite B, Mitra R, et al. Prediction of horizontal movement and strain at the surface due to longwall coal mining[J]. International Journal of Rock Mechanics and Mining Sciences, 2016, 84: 105-118.
[2] 张村, 赵毅鑫, 屠世浩, 等. 采空区破碎煤岩样压实再次破碎特征的数值模拟研究[J]. 岩土工程学报, 2020, 42(4): 696-704.
[3] 苏承东, 顾明, 唐旭, 等. 煤层顶板破碎岩石压实特征的试验研究[J]. 岩石力学与工程学报, 2012, 31(1): 18-26.
[4] 孙利辉, 纪洪广, 蒋华, 等. 弱胶结地层条件下垮落带岩层破碎冒落特征与压实变形规律试验研究[J]. 煤炭学报, 2017, 42(10): 2565-2572.
[5] 张天军, 尚宏波, 李树刚, 等. 破碎矸石分级加载蠕变过程中的渗流试验研究[J]. 采矿与安全工程学报, 2018, 35(1): 188-196.
[6] Li M, Zhang J X,Huang Y L,et al. Research on compression ratio design based on compaction properties of solid backfill materials[J]. Journal of Mining and Safety Engineering,2017,34(6):1110-1115.
[7] Wang C X, Shen B T, Chen J T, et al.Compression characteristics of filling gangue and simulation of mining with gangue backfilling: an experimental investigation[J]. Geomechanics and Engineering, 2020, 20(6): 485-495.
[8] 姜振泉, 季梁军, 左如松. 煤矸石的破碎压密作用机制研究[J]. 中国矿业大学学报, 2001, 30(2): 139-142.
[9] 王磊, 郭广礼, 张鲜妮, 等. 基于关键层理论的长壁垮落法开采老采空区地基稳定性评价[J]. 采矿与安全工程学报, 2010 (1): 57-61.
[10] 郭文兵.深部大采宽条带开采地表移动的预计[J]. 煤炭学报,2008(4):368-372.
[11] 邓喀中, 张冬至, 张周权. 深部开采条件下地表沉陷预测及控制探讨[J]. 中国矿业大学学报, 2000, 29(1): 52-55.
[12] 邓喀中, 周鸣, 谭志祥, 等. 采动岩体破裂规律的试验研究[J]. 中国矿业大学学报, 1998, 27(3): 261-264.
[13] 陈晓祥, 苏承东, 唐旭, 等. 饱水对煤层顶板碎石压实特征影响的试验研究[J]. 岩石力学与工程学报, 2014 (增1): 3318-3326.
[14] 温蓬,郭文兵,白二虎,等.采空区不同岩性破碎岩石压实变形及声发射特征研究[J]. 采矿与安全工程学报,2024,41(2):384-394.
[15] 杨少博,邱珍锋,王爱国,等.考虑缩尺效应对颗粒破碎影响的堆石料临界状态研究[J]. 长江科学院院报,2022,39(2):122-128.
[16] 郁邦永,陈占清,戴玉伟,等.饱和破碎砂岩压实过程中粒度分布及能量耗散[J]. 采矿与安全工程学报, 2018, 35(1):197-204.
[17] 蒋力帅, 武泉森, 李小裕, 等.采动应力与采空区压实承载耦合分析方法研究[J]. 煤炭学报, 2017, 42(8):1951-1959.
[18] 马占国, 郭广礼, 陈荣华, 等. 饱和破碎岩石压实变形特性的试验研究[J]. 岩石力学与工程学报, 2005, 24(7):1139-1144.
[19] 马占国,浦海,张帆,等.煤矸石压实特性研究[J]. 采矿与安全工程学报, 2003, 20(1):95-96.
[20] 张振南,缪协兴,葛修润.松散岩块压实破碎规律的试验研究[J]. 岩石力学与工程学报, 2005, 24(3):451-455.
[21] 孙闯, 闫少宏, 徐乃忠, 等. 大采高综采工作面采空区垮落矸石刚度实验[J]. 煤炭学报, 2020,45(增1):38-48.
[22] 褚廷湘, 李品, 晁江坤, 等. 承压破碎煤体碎胀系数演变特征与机制[J]. 煤炭学报, 2017, 42(12): 3182-3188.
[23] Yu M, Wu M, Yang X, et al.Effect of temperature on the evolution and distribution for particle size of loose broken coal during the uniaxial confined compression process[J]. Fuel, 2022, 318: 123592.
[24] 张天军, 陈佳伟, 包若羽, 等. 不同浸水时间级配破碎煤样的粒度分布分形特征[J]. 采矿与安全工程学报,2018,35(3):598-604.
[25] 蔡毅, 严家平, 徐良骥, 等. 不同含水状态采空区冒落岩体压缩变形特征研究[J]. 煤炭科学技术, 2014, 42(11): 17-20, 128.
[26] 孟召平, 李明生, 陆鹏庆, 等. 深部温度, 压力条件及其对砂岩力学性质的影响[J]. 岩石力学与工程学报, 2006, 25(6): 1177-1181.
[27] 孔宪京, 宁凡伟, 刘京茂, 等. 应力路径和干湿状态对堆石料颗粒破碎的影响研究[J]. 岩土力学, 2019 (6): 2059-2065.
[28] 张天军, 郭毅, 庞明坤, 等. 不同环境湿度下承压破碎煤岩蠕变分形特征研究[J]. 采矿与安全工程学报, 2020, 37(5): 1037-1044.
[29] 张天军, 刘楠, 庞明坤, 等. 级配破碎煤岩体压实过程中再破碎特征研究[J]. 采矿与安全工程学报, 2021, 38(2): 380-387.
[30] 张天军,王小军,庞明坤,等.考虑间断级配的破碎矸石压实和再破碎研究[J]. 中南大学学报:自然科学版, 2023, 54(1):314-326.
[31] 张村,赵毅鑫,屠世浩,等.颗粒粒径对采空区破碎煤体压实破碎特征影响机制[J]. 煤炭学报, 2020, 45(增2):660-670.
[32] 王文, 李化敏, 熊祖强, 等. 粒径级配对矸石压实变形特性影响研究[J]. 地下空间与工程学报, 2016, 12(6): 1553-1558.
[33] 张振东, 李国英. 循环荷载作用下堆石料颗粒破碎特性试验研究[J]. 岩土工程学报, 2017, 39(8): 1510-1516.
[34] 陈子玉, 李国英, 魏匡民, 等. 基于分形理论的堆石料颗粒破碎极限和概率研究[J]. 岩土工程学报, 2021, 43(7): 1192-1200.
[35] 韩华强, 陈生水, 傅华, 等. 循环荷载作用下堆石料的颗粒破碎特性[J]. 岩土工程学报, 2017, 39(10): 1753-1760.
[36] 郁邦永, 潘书才, 魏建军, 等. 承压饱和破碎岩石颗粒破碎及渗透率演化特征研究[J]. 采矿与安全工程学报, 2020,37(3):632-638.
[37] Cheng Y, Song Z, Xu Z, et al.Failure mechanism and infrared radiation characteristic of hard siltstone induced by stratification effect[J]. Journal of Mountain Science, 2024, 21(3): 1058-1074.
[38] 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.
[39] 宋战平, 程昀, 杨腾添, 等. 渗透压作用对灰岩孔隙结构演化规律影响的试验研究[J]. 岩土力学, 2019, 40(12): 4607-4619.
[40] Li J, Huang Y, Zhai W, et al. Experimental study on acoustic emission of confined compression of crushed gangue under different loading rates: disposal of gangue solid waste[J]. Sustainability, 2020, 12(9): 3911.
[41] 罗肖龙,何祥,杨科,等.Talbol级配下矸石集料承载特性与声发射响应特征研究[J]. 煤炭技术,2023,42(12):27-31.
[42] 李巍,黄艳利,高华东,等.不同级配矸石侧限压缩过程声发射特征研究[J]. 采矿与安全工程学报, 2020, 37(1):155-161,168.
[43] 何淑欣, 杨科, 何祥, 等. 正态分布矸石侧限压缩特征与声发射特征研究[J]. 地下空间与工程学报, 2024, 20(3): 827-837
[44] Feng G, Zhao J, Wang H, et al. Study of the internal re-breaking characteristics of broken limestone during compression[J]. Powder Technology, 2022, 396: 449-455.
[45] 李振, 方智龙, 冯国瑞, 等. 破碎煤岩体试样声发射三维定位方法及分层破碎特性[J]. 太原理工大学学报, 2022, 53(3): 507-514.
[46] Zhang C, Zhao Y, Bai Q. 3D DEM method for compaction and breakage characteristics simulation of broken rock mass in goaf[J]. Acta Geotechnica, 2022, 17(7): 2765-2781.
[47] 胡沈江, 郭宁, 杨仲轩, 等. 堆石料颗粒破碎强度的尺寸和形状效应隐式离散元研究[J]. 岩土工程学报, 2023, 45(2): 433-440.
[48] Liu A, Liu S, Wang G, et al.Continuous compaction and permeability evolution in longwall gob materials[J]. Rock Mechanics and Rock Engineering, 2020, 53: 5489-5510.
[49] 宋战平, 程昀, 杨腾添, 等. 循环荷载下硬质层理砂岩疲劳损伤机制试验研究[J]. 岩土工程学报, 2024, 46(3): 490-499.
[50] 宋战平,程昀,杨腾添,等.渗透-应力耦合作用下灰岩压缩破坏及声发射特性分析[J]. 煤炭学报,2019,44(9):2751-2759.
[51] Li J, Lian S, Huang Y, et al. Study on crack classification criterion and failure evaluation index of red sandstone based on acoustic emission parameter analysis[J]. Sustainability, 2022, 14(9): 5143.
[52] 戚靖骅, 赵春晓, 李强, 等. 不同频率循环荷载下砂岩变形与声发射试验研究[J]. 地下空间与工程学报, 2024, 20(1): 64-71.
[53] 胡千庭, 刘荣辉, 李全贵, 等. 单轴压缩下典型煤岩破坏的声发射特征研究[J]. 地下空间与工程学报, 2023, 19(6): 1769-1781.
[54] 雷瑞德,粟罗,贺培,等.不同高径比煤样巴西劈裂声发射特征及能量演化机制研究[J]. 煤炭科学技术, 2024,52(10):63-77.
[55] 张村,王磊,王潇杰,等.含水率影响下煤体巴西劈裂特性与弱化机制[J]. 采矿与安全工程学报,2024,41(2):362-371.
[56] 刘斌,赵毅鑫,张汉,等.单轴压缩及劈裂试验下煤的声发射特征研究[J]. 采矿与安全工程学报,2020,37(3):613-621.
[57] 黄亦磊,周仕勇,庄建仓.基于地震目录估计完备震级方法的数值实验[J]. 地球物理学报,2016,59(4):1350-1358.
[58] 徐世达,李元辉,刘建坡,等.双轴加载下花岗岩破裂过程声发射b值特征研究[J]. 中国矿业,2019,28(12):100-103.
[59] 吴果,周庆,冉洪流.震级﹣频度关系中b值的极大似然法估计及其影响因素分析[J]. 地震地质,2019,41(1):21-43.

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