Experimental study on the influence of stress disturbance path on the mechanical properties of coal specimens
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摘要:
在利用废弃矿井抽水蓄能过程中，煤柱不仅受到单调荷载的影响，而且会遭受频繁的应力扰动。以陕西省河畔煤矿煤岩为研究对象，研究了单调荷载（路径1）、多级等幅循环荷载（路径2）、多级增幅循环荷载（路径3）影响下试样的强度、变形特征以及破坏模式。试验结果表明：循环荷载作用下，试样的应力-应变曲线形成了明显的滞回环，且随着应力水平增加，滞回环面积显著增加；与轴向应变相比，环向应变对应力路径的敏感性更强；单调荷载作用下煤样的峰值强度和峰值应变最大，多级循环荷载作用下试样的强度和峰值轴向应变分别降低了22.12%、18.35%（路径2）、5.30%、10.34%（路径3）；应力路径2作用下的试样割线模量明显高于其他应力路径；应力路径对试样宏观破坏模式的影响甚微，但多级循环荷载使得试样表面裂纹数量和尺寸变大。
Abstract:During pumped energy storage using abandoned mines, coal pillars are not only affected by monotonic loads, but also suffer from frequent stress disturbances. The strength and deformation characteristics as well as the failure mode of the coal specimens under the influence of monotonic loading (stress path 1), multilevel constant-amplitude cyclic loading (stress path 2) and multilevel increasing cyclic loading (stress path 3) were studied using the coal samples from Hepan Coal Mine, Shaanxi Province, as the research object. The test results showed that the stress-strain curves of the coal specimens under cyclic loading formed obvious hysteresis loops, and the area of hysteresis loops increased significantly with the rise of stress level; compared with the axial strain, the circumstantial strain was more sensitive to the stress path; the peak strength and peak axial strain of the coal samples were the largest under monotonic loading, and the peak strength and axial strain of the specimens decreased by 22.12% and 18.35% (path 2) and 5.30% and 10.34% (path 3) under multi-level cyclic loading, respectively; the tangent modulus of the specimens under stress path 2 was significantly higher than the other stress paths; the stress paths had not changed the macroscopic failure mode of the coal specimens, but the cyclic loading caused the number and size of cracks on the specimen’s surface to become larger.
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图 3 应力路径对煤样轴向应力-轴向/环向应变曲线的影响
Figure 3. Effect of the stress paths on the axial stress-axial (lateral) strain of coal specimens
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图 4 应力路径对煤样轴向应力-体积应变曲线的影响
Figure 4. Effect of the stress paths on the axial stress- volumetric strain of coal specimens
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图 6 3种应力路径下煤样割线模量的演化规律
Figure 6. Evolution law of elastic modulus of coal specimens under three stress paths
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[1] 张进鹏,刘立民,刘传孝,等. 基于预应力锚和自应力注的破碎围岩锚注加固应用研究[J]. 采矿与安全工程学报,2021,38(4):774−783. ZHANG Jinpeng, LIU Limin, LIU Chuanxiao, et al. Application of bolt-grouting reinforcement for broken surrounding rock based on prestressed bolt and self-stress grouting[J]. Journal of Mining & Safety Engineering, 2021, 38(4): 774−783.
[2] 杜俊生,陈结,姜德义,等. 中国废弃煤矿压气蓄能潜力与初步可行性研究[J]. 工程科学与技术,2023,55(1):253−264. DU Junsheng, CHEN Jie, JIANG Deyi, et al. Study on the potential and pre-feasibility of compressed air energy storage of abandoned coal mines in China[J]. Advanced Engineering Sciences, 2023, 55(1): 253−264.
[3] 刘钦节,杨卿干,杨科,等. 废弃矿井抽水蓄能电站多能互补利用模式及案例分析[J]. 采矿与安全工程学报,2023,40(3):578−586. LIU Qinjie, YANG Qinggan, YANG Ke, et al. Case study of pumped storage hydropower based on multi-energy complementary utilization mode in abandoned coal mines[J]. Journal of Mining & Safety Engineering, 2023, 40(3): 578−586.
[4] 张志强,张珊珊,姚海清,等. 废弃矿井地热资源利用的研究与发展[J]. 区域供热,2022(4):45−55. ZHANG Zhiqiang, ZHANG Shanshan, YAO Haiqing, et al. Research and development of geothermal resources utilization in abandoned mine[J]. District Heating, 2022(4): 45−55.
[5] 陈文轩,康宝伟,王旭宏,等. 国外利用废弃矿井对放射性废弃物的处置[J]. 工业建筑,2018,48(4):9−12. CHEN Wenxuan, KANG Baowei, WANG Xuhong, et al. The disposal of radioactive waste using abandoned mine at abroad[J]. Industrial Construction, 2018, 48(4): 9−12.
[6] ZHANG D, LU G, WU J, et al. Effects of ultralow temperature and water saturation on the mechanical properties of sandstone[J]. Rock Mechanics and Rock Engineering, 2023, 56: 3377−3397.
[7] LI K S, YANG S Q, LIU C X, et al. Mechanical response and microscopic damage mechanism of pre-flawed sandstone subjected to monotonic and multilevel cyclic loading: A laboratory-scale investigation[J]. International Journal of Mining Science and Technology, 2023, 33(12): 1487−1510. doi: 10.1016/j.ijmst.2023.11.002
[8] 赵慧,王兆瑞,高云梦,等. 循环荷载下煤的变形及渗透率演化规律研究[J]. 当代化工研究,2023(21):45−47. ZHAO Hui, WANG Zhaorui, GAO Yunmeng, et al. Study on deformation and permeability evolution of coal under cyclic loading[J]. Modern Chemical Research, 2023(21): 45−47.
[9] 杨真,郭爱伟. 循环荷载作用下煤体力学特性及能量演化规律研究[J]. 中国煤炭,2023,49(3):42−47. YANG Zhen, GUO Aiwei. Study on mechanical properties and energy evolution law of coal under cyclic load[J]. China Coal, 2023, 49(3): 42−47.
[10] 邓川. 循环荷载作用下煤岩力学及声发射特征研究[J]. 煤矿安全,2020,51(2):63−69. DENG Chuan. Study on mechanical and acoustic emission characteristics of coal rock under cyclic loading[J]. Safety in Coal Mines, 2020, 51(2): 63−69.
[11] 孙达. 循环荷载作用下煤样疲劳特性的试验研究[J]. 山东煤炭科技,2019(2):206−208. SUN Da. Experimental investigation on fatigue properties of coal under cyclic loading[J]. Shandong Coal Science and Technology, 2019(2): 206−208.
[12] 王辰霖,张小东,李贵中,等. 循环加卸载作用下不同高度煤样渗透性试验研究[J]. 岩石力学与工程学报,2018,37(10):2299−2308. WANG Chenlin, ZHANG Xiaodong, LI Guizhong, et al. Experimental study on the permeability of coal samples with different heights under cyclic loading and unloading[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37(10): 2299−2308.
[13] 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 Junpeng, CHEN Weizhong, YANG Diansen, et al. Mechanical properties and damage evolution of coal under cyclic loading conditions[J]. Journal of China Coal Society, 2016, 41(7): 1675−1682.
[14] 田文岭,杨圣奇,方刚. 煤样三轴循环加卸载力学特征颗粒流模拟[J]. 煤炭学报,2016,41(3):603−610. TIAN Wenling, YANG Shengqi, FANG Gang. Particle flow simulation on mechanical behavior of coal specimen under triaxial cyclic loading and unloading[J]. Journal of China Coal Society, 2016, 41(3): 603−610.
[15] 周佳琦. 变下限梯级循环加卸载下砂岩变形参数与损伤演化规律研究[D]. 重庆:重庆大学,2022. [16] 王宇,杨浩男,易雪枫,等. 增幅疲劳荷载作用下含双裂隙花岗岩空心圆柱破裂演化试验研究[J]. 岩石力学与工程学报,2022,41(7):1325−1337. WANG Yu, YANG Haonan, YI Xuefeng, et al. Investigation on fracture evolution of pre-flawed hollow-cylinder granite under increasing-amplitude cyclic loads[J]. Chinese Journal of Rock Mechanics and Engineering, 2022, 41(7): 1325−1337.
[17] WANG J, LI J, SHI Z, et al. Fatigue characteristics and fracture behaviour of sandstone under discontinuous multilevel constant-amplitude fatigue disturbance[J]. Engineering Fracture Mechanics, 2022, 274: 108773. doi: 10.1016/j.engfracmech.2022.108773
[18] 李克升,刘传孝. 梯级等幅周期循环荷载作用下双裂隙黄砂岩力学特性试验研究[J]. 岩石力学与工程学报,2023,42(8):1945−1958. LI Kesheng, LIU Chuanxiao. Experimental investigation on mechanical properties of yellow sandstone samples containing two coplanar fissures under multistage constant-amplitude-cyclic loading[J]. Chinese Journal of Rock Mechanics and Engineering, 2023, 42(8): 1945−1958.
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期刊类型引用(1)
1. 柳昭星. 奥陶系灰岩顶部劈裂注浆裂隙起裂机制试验研究. 采矿与安全工程学报. 2023(01): 204-214 . 
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