循环冲击荷载作用下煤岩组合体力学响应和能量耗散特征研究

PDF(3083 KB)

振动与冲击 ›› 2024, Vol. 43 ›› Issue (20) : 150-161.

论文

循环冲击荷载作用下煤岩组合体力学响应和能量耗散特征研究

杨科1,2，郑诗章1,2，刘文杰1,2,3，许日杰1,2，张寨男1,2，刘帅1,2，池小楼1,2

作者信息 +

A study on the mechanical response and energy dissipation characteristics of coal-rock composite under cyclical impact loads

YANG Ke1,2，ZHENG Shizhang1,2，LIU Wenjie1,2,3，XU Rijie1,2，ZHANG Zhainan1,2，LIU Shuai1,2，CHI Xiaolou1,2

Author information +

文章历史 +

摘要

为探究循环冲击下煤岩组合体的力学响应与能量耗散特征，采用分离式霍普金森压杆实验系统（SHPB），设计开展5种不同冲击速度的煤岩组合体循环冲击压缩实验，对比分析不同冲击速度下组合体动态应力应变关系、能量耗散特性和破坏特征。研究结果表明：循环冲击下煤岩组合体存在明显的临界效应，冲击速度低于临界速度时动态抗压强度在冲击前期迅速降低，峰值应变变化率随冲击速度增加而降低；循环冲击下试件总吸收能和分形维数逐渐增大，在临界速度时达到峰值，超过临界速度后两者皆降低；冲击速度超过临界速度后，总吸收能相同时循环冲击条件下煤岩体破坏程度高于单次冲击；煤岩强度比1:2时，随着总吸收能的增加，岩体从积聚和传递能量作用转向于加剧组合体破坏；冲击作用下组合体呈张拉劈裂破坏，低速条件下宏观裂纹萌发主要发生在远离胶结面的煤体端面，随着冲击速度增大远离胶结面岩体一侧亦有裂纹出现，根据失稳发生区域组合体破坏类型分为煤体失稳型和组合体失稳型，循环冲击下均发生组合体失稳型破坏。研究结果为软弱岩层动压巷道与采场围岩稳定性控制提供基础研究。

Abstract

In order to investigate the mechanical response and energy dissipation characteristics of coal-rock composite specimens under cyclic impact, a Split Hopkinson Pressure Bar (SHPB) experimental system was employed. Five different impact velocities were designed for cyclic impact compression experiments on coal-rock composite specimens. Comparative analyses were conducted to examine the dynamic stress-strain relationships, energy dissipation characteristics, and failure features of the composite specimens at different impact velocities. The research results indicate that under cyclic impact, coal-rock composite specimens exhibit a pronounced critical effect. When the impact velocity is below the critical velocity, the dynamic compressive strength rapidly decreases in the early stage of the impact, and the rate of change in peak strain decreases with increasing impact velocity. During cyclic impact, the total absorbed energy and fractal dimension of the specimens gradually increase, reaching their peak values at the critical velocity, after which both parameters decrease. Beyond the critical velocity, under equivalent total absorbed energy, the degree of damage to coal-rock formations under cyclic impact is higher than that under a single impact. With a coal-rock strength ratio of 1:2, as the total absorbed energy increases, the rock transitions from accumulating and transmitting energy to intensifying composite body damage. Under impact, the composite body exhibits tensile and splitting failure. Under low-speed conditions, macroscopic cracks mainly initiate at the coal body end face far from the bonding surface. As the impact velocity increases, cracks also appear on the side of the rock away from the bonding surface. According to the region of instability, the failure types of the composite body are classified into coal body instability and composite body instability, and under cyclic impact, the composite body exhibits composite body instability failure. The research results provide a fundamental basis for the stability control of dynamic pressure roadways and surrounding rock in weak rock layers.

导出引用

杨科1, 2, 郑诗章1, 2, 刘文杰1, 2, 3, 许日杰1, 2, 张寨男1, 2, 刘帅1, 2, 池小楼1, 2. 循环冲击荷载作用下煤岩组合体力学响应和能量耗散特征研究[J]. 振动与冲击, 2024, 43(20): 150-161

YANG Ke1, 2, ZHENG Shizhang1, 2, LIU Wenjie1, 2, 3, XU Rijie1, 2, ZHANG Zhainan1, 2, LIU Shuai1, 2, CHI Xiaolou1, 2. A study on the mechanical response and energy dissipation characteristics of coal-rock composite under cyclical impact loads[J]. Journal of Vibration and Shock, 2024, 43(20): 150-161

参考文献

[1] 国家统计局.中国统计年鉴-2022[M/CD]. 北京:中国统计出版社,2022.
National Bureau of statistics of China. China Statistical Year-book- 2022. Beijing: China Statistics Press, 2022.
[2] 袁亮.我国煤炭主体能源安全高质量发展的理论技术思考[J].中国科学院院刊,2023,38(01):11-22.
Yuan Liang. Theory and technology considerations on high-quality development of coal main energy security in China. Bulletin of Chinese Academy of Sciences, 2023, 38(1): 11-22.
[3] 袁亮.我国深部煤与瓦斯共采战略思考[J].煤炭学报,2016, 41(01):1-6.
Yuan Liang. Strategic thinking of simultaneous exploitation of coal and gas in deep mining[J]. Journal of China Coal Society, 2016, 41(1): 1-6.
[4] XIE H P, GAO M Z, ZHANG R, et al. Study on the mechani-cal properties and mechanical response of coal mining at 1000 m or deeper[J]. Rock Mechanics and Rock Engineering, 2019, 52: 1475-1490.
[5] 谢和平.深部岩体力学与开采理论研究进展[J].煤炭学报, 2019,44(05):1283-1305.
XIE Heping. Research review of the state key research de-velopment program of China:Deep rock mechanics and mining theory[J]. Journal of China Coal Society, 2019, 44(5): 1283-1305.
[6] 左建平.深部煤岩组合体破坏力学与模型[M].北京:科学出版社,2017:1-11.
ZUO Jianping. Destruction mechanics and model of Deep coal-rock combined body[M]. Beijing: Science Press, 2017:1-11.
[7] 左建平,裴建良,刘建锋,等.煤岩体破裂过程中声发射行为及时空演化机制[J].岩石力学与工程学报,2011,30(08): 1564-1570.
ZUO Jianping, PEI Jianliang, LIU Jianfeng, et al. Investigation on acoustic emission behavior and its time-space evolution mechanism in the failure process of coal-rock combined body[J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(08): 1564-1570.
[8] JIANG Y J, LIANG B, WANG D, et al. Experimental study on failure mechanical properties and acoustic emission char-acteristics of soft rock-coal combination under dynamic dis-turbance[J]. Engineering Failure Analysis, 2024, 158: 108016.
[9] 郭东明,左建平,张毅,等.不同倾角组合煤岩体的强度与破坏机制研究[J].岩土力学,2011,32(05):1333-1339.
GUO Dongming, ZUO Jianping, ZHANG Yi, et al. Research on strength and failure mechanism of deep coal-rock combi-nation bodies of different inclined angles[J].Rock and Soil Mechanics, 2011, 32(05): 1333-1339.
[10] 张泽天,刘建锋,王璐,等.组合方式对煤岩组合体力学特性和破坏特征影响的试验研究[J].煤炭学报,2012,37(10): 1677-1681.
ZHANG Zetian, LIU Jianfeng, WANG Lu, et al. Effects of combination mode on mechanical properties and failure char-acteristics of the coal-rock combinations[J]. Journal Of China Coal Society, 2012, 37(10):1677-1681.
[11] 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(07):2469-2475.
ZHU Zhuohui, FENG Tao, GONG Fengqiang, et al. Ex-perimental research of mechanical properties on grading cycle loading-unloading behavior of coal-rock combination bodies at different stress levels[J]. Journal of Central South University (Science and Technology) , 2016, 47(07): 2469-2475.
[12] 左建平,陈岩,宋洪强,等.煤岩组合体峰前轴向裂纹演化与非线性模型[J].岩土工程学报,2017,39(09):1609-1615.
ZUO Jianping, CHEN Yan, SONG Hongqiang, et al. Evolu-tion of pre-peak axial crack strain and nonlinear model for coal-rock combined body[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(09): 1609-1615.
[13] 陈岩,左建平,魏旭,等.煤岩组合体破坏行为的能量非线性演化特征[J].地下空间与工程学报,2017,13(01):124-132.
CHEN Yan, ZUO Jianping, WEI Xu, et al. Energy Nonlinear Evolution Characteristics of the Failure Behavior of Coal-rock Combined Body[J]. Chinese Journal of Underground Space and Engineering, 2017, 13(01): 124-132.
[14] 左建平,宋洪强,陈岩,等.煤岩组合体峰后渐进破坏特征与非线性模型[J].煤炭学报,2018,43(12):3265-3272.
ZUO Jianping, SONG Hongqiang, CHEN Yan, et al. Post-peak progressive failure characteristics and nonlinear model of coal-rock combined body[J]. Journal Of China Coal Society, 2018, 43(12): 3265-3272.
[15] LIU X S, TAN Y L, NING J G, et al. Mechanical properties and damage constitutive model of coal in coal-rock combined body[J]. International Journal of Rock Mechanics and Mining Sciences, 2018, 110: 140-150.
[16] LI F X, YIN D W, WANG F, et al. Effects of combination mode on mechanical properties of bi-material samples con-sisting of rock and coal[J]. Journal of Materials Research and Technology, 2022, 19: 2156-2170.
[17] LI Z B, ZHANG G H, LI Y B, et al. Energy Accumulation Law of Different Forms of Coal-Rock Combinations[J]. Ap-plied Science, 2023, 13(20), 11393.
[18] CHAI Y J, DOU L M, CAI W, et al. Experimental investiga-tion into damage and failure process of coal-rock composite structures with different roof lithologies under mining-induced stress loading[J]. International Journal of Rock Mechanics and Mining Sciences, 2023, 170:105479.
[19] 陈光波,李谭,张国华,等.煤岩组合体破坏前能量积聚规律试验研究[J].煤炭学报,2021,46(S1):174-186.
CHEN Guangbo, LI Tan, ZHANG Guohua, et al. Experi-mental study on the law of energy accumulation before failure of coal-rock combined body[J]. Journal Of China Coal Society, 2021, 46(S1): 174-186.
[20] 陈光波,李谭,张国华,等.基于剩余能量释放速率指数的煤岩组合体冲击倾向性判定[J].岩石力学与工程学报,2023, 42(06):1366-1383.
CHEN Guangbo, LI Tan, ZHANG Guohua, et al. Determina-tion of bursting liability of coal-rock combined body based on residual energy release rate index[J/OL]. Chinese Journal of Rock Mechanics and Engineering, 2023, 42(06): 1366-1383.
[21] SUN, X Y, JIN T X, LI J H, et al. Dynamic characteristics and crack evolution laws of coal and rock under split Hopkinson pressure bar impact loading[J]. Measurement Science and Technology, 2023, 34(7): 075601.
[22] 李成杰,徐颖,张宇婷,等.冲击荷载下裂隙类煤岩组合体能量演化与分形特征研究[J].岩石力学与工程学报,2019, 38(11): 2231-2241.
LI Chengjie, XU Ying, ZHANG Yuting, et al. Study on ener-gy evolution and fractal characteristics of cracked coal-rock-like combined body under impact loading[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38(11): 2231-2241.
[23] ZHAO E L, WANG E Y, CHEN H P. Study on Dynamic Pa-rameters and Energy Dissipation Characteristics of Coal Samples under Dynamic Load and Temperature[J]. Processes, 2023, 11(12): 3326.
[24] GONG F Q, YE H, LUO Y, et al. The effect of high loading rate on the behavior and mechanical properties of coal-rock combined body [J]. Shock and Vibration, 2018, 4374530.
[25] 杨科,刘文杰,马衍坤,等.煤岩组合体冲击动力学特征试验研究[J].煤炭学报,2022,47(07):2569-2581.
YANG Ke, LIU Wenjie, MA Yankun, et al. Experimental re-search on dynamic characteristics of coal-rock combined specimen[J]. Journal Of China Coal Society, 2022, 47(07): 2569-2581.
[26] SONG Y Q, MA M F,YANG J K, et al. Dynamic Mechanical Behaviors and Failure Mechanism of Lignite under SHPB Compression Test[J]. Sustainability, 2022, 14: 10528.
[27] XUE Y, LIU X H, ZHAO R, et al. Investigation on Triaxial Dynamic Model Based on the Energy Theory of Bedding Coal Rock under Triaxial Impact Compression[J]. Shock and Vibration, 2021, (2021): 1-15.
[28] GU Z J, SHEN R X, LIU Z T, et al. Strain rate effect and mechanical constitutive model of coal samples under dynamic load[J]. Natural Resources Research, 2023, 32(6):2769-2785.
[29] KONG X G, LI S G, WANG E Y, et al. Dynamics behaviour of gas-bearing coal subjected to SHPB tests[J]. Composite Structures, 2021, 256:113088.
[30] 王磊,王安铖,陈礼鹏,等.含瓦斯煤循环冲击动力学特性与裂隙扩展特征[J].岩石力学与工程学报,2023,42(11): 2628-2642.
WANG Lei, WANG Ancheng, CHEN Lipeng, et al. Dynamic characteristics and crack propagation characteristics of gas-bearing coal under cyclic impact[J]. Chinese Journal of Rock Mechanics and Engineering, 2023, 42(11): 2628-2642.
[31] LI D, HAN Z, ZHU Q, et al. Stress wave propagation and dynamic behavior of red sandstone with single bonded planar joint at various angles [J]. International Journal of Rock Me-chanics and Mining Sciences, 2019, 117: 162-170.
[32] 卢芳云,陈荣,林玉亮,等.霍普金森压杆实验技术[M].北京:科学出版社,2013:23-44.
LU Fangyun, CHEN Rong, LIN Yuliang, et al. Hopkinson Bar Techniques[M]. Beijing: Science Press, 2013: 23-44.
[33] LI X, Lok T, ZHAO J, et al. Dynamic characteristics of granite subjected to intermediate loading rate[J]. Rock Mechanics and Rock Engineering, 2005, 38(1): 21-39.
[34] 王雁冰,任斌,耿延杰,等.软硬介质组合岩体冲击动力学特性研究[J].振动与冲击,2023,42(12):135-144.
WANG Yanbing, REN Bin, GENG Yanjie, et al. A study on the impact dynamic characteristics of soft and hard medium combined rock mass[J]. Journal of Vibration and Shock, 2023, 42(12): 135-144.
[35] 杨科,张寨男,华心祝,等.饱和煤样力学及损伤特征的加载速率微观作用机制研究[J].煤炭科学技术,2023,51(02): 130-142.
YANG Ke, ZhANG Zhainan, HUA Xinzhu, et al. Microscopic Mechanism of Loading Rate on Saturated Coal Sample Mechanics and Damage Characteristics[J]. Coal Science and Technology, 2023, 51(02): 130-142.
[36] 杨科,刘文杰,窦礼同,等.煤岩组合体界面效应与渐进失稳特征试验[J].煤炭学报,2020,45(05):1691-1700.
YANG Ke, LIU Wenjie, DOU Litong, et al. Experimental In-vestigation into Interface Effect and Progressive Instability of Coal-Rock Combined Specimen[J]. Journal Of China Coal Society, 2020, 45(05): 1691-1700.
[37] 殷志强,谢广祥,胡祖祥,等.不同瓦斯压力下煤岩三点弯曲断裂特性研究[J].煤炭学报,2016,41(02):424-431.
YIN Zhiqiang, XIE Guangxiang, HU Zuxiang, et al. Investi-gation on the Fracture Mechanism of Coal Rock in Three-Point Bending Tests Under Different Gas Pressures[J]. Journal Of China Coal Society, 2016, 41(02): 424-431.
[38] 赵毅鑫,孙荘,宋红华,等.煤Ⅰ型动态断裂裂纹扩展规律试验与数值模拟研究[J].煤炭学报,2020,45(12):3961-3972.
ZhAO Yixin, SUN Zhuang, SONG Honghua, et al. Crack Propagation Law of Mode I Dynamic Fracture of Coal: Ex-periment and Numerical Simulation[J]. Journal Of China Coal Society, 2020, 45(12): 3961-3972.