| Citation: |
JIAO Zhenhua，NI Zhihui，HU Hao，et al. Testing and numerical simulation of mechanical behavior of drilled coal samples under uniaxial compression[J]. Coal Science and Technology，2025，53（S1）：108−119. DOI: 10.12438/cst.2024-0139
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Coal seam drilling unloading is the most widely used impact ground pressure prevention and control technology in the field, in order to explore the influence of hole defects on the mechanical properties, energy accumulation and release, and damage mode of the coal body, the uniaxial loading test, combined with particle discrete element simulation, respectively, from the macro and fine viewpoint to study the stress-strain curve, energy evolution, crack expansion and damage characteristics of the coal samples with different hole diameters. The results show that the mechanical parameters of the hole-containing coal samples are significantly lower than those of the intact coal samples, and the peak strength, peak strain and modulus of elasticity of the hole-containing coal samples show a tendency of attenuation with the increase of the diameter of the drill hole. During the loading process, the hole-containing coal samples showed a sudden drop in stress before the peak stress, which was more obvious in the numerical simulation, indicating that the presence of the drill holes damaged the original structure of the coal samples and weakened their bearing capacity. The energy evolution laws of intact and hole-containing coal samples are basically the same, with elastic energy accumulation dominating before the peak strength is reached, and dissipated energy increasing sharply after the peak strength. Compared with other mechanical parameters, the elastic energy index decreased more. The larger the drilling diameter, the smaller the strain corresponding to the sharp increase in the energy dissipation ratio, and thus the less likely to accumulate energy for impact damage. Comparing the stress field distribution before and after the damage of coal samples through numerical simulation, it can be seen that the value and distribution range of tensile stress increase with the increase of the borehole diameter, and the borehole diameter has a significant effect on the expansion of the tensile stress region and the magnitude of the tensile stress. From the analysis of stress tensor evolution, it is found that both the magnitude and direction of stress have a guiding effect on the emergence and development of the fissure, and there will be an obvious stress deflection phenomenon around the drill hole.
| [1] |
潘一山,宋义敏,刘军. 我国煤矿冲击地压防治的格局、变局和新局[J]. 岩石力学与工程学报,2023,42(9):2081−2095.
PAN Yishan,SONG Yimin,LIU Jun. Pattern,change and new situation of coal mine rockburst prevention and control in China[J]. Chinese Journal of Rock Mechanics and Engineering,2023,42(9):2081−2095.
|
| [2] |
CHEN M,ZHANG Y L,ZANG C W,et al. Experimental investigation on pressure relief mechanism of specimens with prefabricated reaming boreholes[J]. Rock Mechanics and Rock Engineering,2023,56(4):2949−2966. doi: 10.1007/s00603-022-03159-1
|
| [3] |
朱斯陶,姜福兴,史先锋,等. 防冲钻孔参数确定的能量耗散指数法[J]. 岩土力学,2015,36(8):2270−2276.
ZHU Sitao,JIANG Fuxing,SHI Xianfeng,et al. Energy dissipation index method for determining rockburst prevention drilling parameters[J]. Rock and Soil Mechanics,2015,36(8):2270−2276.
|
| [4] |
KENETI A,SAINSBURY B A. Review of published rockburst events and their contributing factors[J]. Engineering Geology,2018,246:361−373. doi: 10.1016/j.enggeo.2018.10.005
|
| [5] |
马斌文,邓志刚,赵善坤,等. 钻孔卸压防治冲击地压机理及影响因素分析[J]. 煤炭科学技术,2020,48(5):35−40.
MA Binwen,DENG Zhigang,ZHAO Shankun,et al. Analysis on mechanism and influencing factors of drilling pressure relief to prevent rock burst[J]. Coal Science and Technology,2020,48(5):35−40.
|
| [6] |
王书文,潘俊锋,刘少虹,等. 基于能量耗散率的钻孔防冲效果评价方法[J]. 煤炭学报,2016,41(S2):297−304.
WANG Shuwen,PAN Junfeng,LIU Shaohong,et al. Evaluation method for rockburst-preventing effects by drilling based on energy-dissipating rate[J]. Journal of China Coal Society,2016,41(S2):297−304.
|
| [7] |
鲁俊,尹光志,高恒,等. 真三轴加载条件下含瓦斯煤体复合动力灾害及钻孔卸压试验研究[J]. 煤炭学报,2020,45(5):1812−1823.
LU Jun,YIN Guangzhi,GAO Heng,et al. Experimental study on compound dynamic disaster and drilling pressure relief of gas-bearing coal under true triaxial loading[J]. Journal of China Coal Society,2020,45(5):1812−1823.
|
| [8] |
潘俊锋,闫耀东,马宏源,等. 一次成孔300 mm煤层大直径钻孔防冲效能试验[J]. 采矿与岩层控制工程学报,2022,4(5):5−15.
PAN Junfeng,YAN Yaodong,MA Hongyuan,et al. Using 300 mm diameter boreholes for coal burst prevention a case study[J]. Journal of Mining and Strata Control Engineering,2022,4(5):5−15.
|
| [9] |
杨圣奇,刘相如,李玉寿. 单轴压缩下含孔洞裂隙砂岩力学特性试验分析[J]. 岩石力学与工程学报,2012,31(S2):3539−3546.
YANG Shengqi,LIU Xiangru,LI Yushou. Experimental analysis of mechanical behavior of sandstone containing hole and fissure under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering,2012,31(S2):3539−3546.
|
| [10] |
YANG S Q,YIN P F,ZHANG Y C,et al. Failure behavior and crack evolution mechanism of a non-persistent jointed rock mass containing a circular hole[J]. International Journal of Rock Mechanics and Mining Sciences,2019,114:101−121. doi: 10.1016/j.ijrmms.2018.12.017
|
| [11] |
宫凤强,何志超. 钻孔卸压防治岩爆机理的试验研究进展与展望[J]. 隧道与地下工程灾害防治,2023,5(2):1−23.
GONG Fengqiang,HE Zhichao. Progress and prospect of experimental research on the mechanism of rockburst prevention and control by drilling pressure relief[J]. Hazard Control in Tunnelling and Underground Engineering,2023,5(2):1−23.
|
| [12] |
张天军,景晨,王喜娜,等. 不同加载速率对含孔试样变形特性影响研究[J]. 采矿与安全工程学报,2021,38(4):847−856.
ZHANG Tianjun,JING Chen,WANG Xina,et al. Experimental investigation of the effect of different loading rates on deformation characteristics of porous samples[J]. Journal of Mining & Safety Engineering,2021,38(4):847−856.
|
| [13] |
张天军,景晨,张磊,等. 含孔试样孔周破坏的应变局部化特征[J]. 煤炭学报,2020,45(12):4087−4094.
ZHANG Tianjun,JING Chen,ZHANG Lei,et al. Strain localization characteristics of perforation failure of perforated specimens[J]. Journal of China Coal Society,2020,45(12):4087−4094.
|
| [14] |
来兴平,方贤威,单鹏飞,等. 脆性孔洞煤样承载过程破坏模式及能量阶段蓄积释放规律分析[J]. 采矿与安全工程学报,2021,38(5):1005−1014.
LAI Xingping,FANG Xianwei,SHAN Pengfei,et al. Failure mode and phased energy accumulation and release law of brittle holey coal samples during loading[J]. Journal of Mining & Safety Engineering,2021,38(5):1005−1014.
|
| [15] |
陈定超,王襄禹,柏建彪,等. 迎采工作面沿空掘巷围岩能量-应力全周期演化规律[J/OL]. (2024−03−09)[2024−05−01]. http://kns.cnki.net/KCMS/detail/detail.aspx? filename=MTKJ20240305003&dbname=CJFD&dbcode=CJFQ.
CHEN Dingchao,WANG Xiangyu,BAI Jianbiao,et al. Full-cycle evolution law of energy-stress of surrounding rock driving along goaf in face-to-face mining face[J/OL]. (2024−03−09)[2024−05−01]. http://kns.cnki.net/KCMS/detail/detail.aspx? filename=MTKJ20240305003&dbname=CJFD&dbcode=CJFQ.
|
| [16] |
尹光志,马波,刘超,等. 真三轴应力条件下加卸荷速率对砂岩力学特性与能量特征的影响[J]. 煤炭学报,2019,44(2):454−462.
YIN Guangzhi,MA Bo,LIU Chao,et al. Effect of loading and unloading rates on mechanical properties and energy characteristics of sandstone under true triaxial stress[J]. Journal of China Coal Society,2019,44(2):454−462.
|
| [17] |
李学华,牛志军,姚强岭,等. 孔洞式三叉裂隙砂岩裂纹扩展特征颗粒流分析[J]. 煤炭学报,2020,45(11):3735−3747.
LI Xuehua,NIU Zhijun,YAO Qiangling,et al. Particle flow analysis of crack propagation characteristics of hole-type trident cracks sandstone[J]. Journal of China Coal Society,2020,45(11):3735−3747.
|
| [18] |
杨磊,王晓卿,李建忠. 不同冲击倾向性煤单轴压缩下能量演化与损伤特征[J]. 煤炭科学技术,2021,49(6):111−118.
YANG Lei,WANG Xiaoqing,LI Jianzhong. Energy evolution and damage characteristics of coal with different bursting liability under uniaxial compression[J]. Coal Science and Technology,2021,49(6):111−118.
|
| [19] |
陈明祥. 弹塑性力学[M]. 北京:科学出版社,2007.
|
| [20] |
王宇驰,杨勇,张忠政,等. 基于PFC2D的不同倾角组合孔洞岩石力学特性及破坏特征[J]. 矿冶,2022,31(3):132−139.
WANG Yuchi,YANG Yong,ZHANG Zhongzheng,et al. Mechanical properties and failure characteristics of combined hole rocks with different dip angles based on PFC2D[J]. Mining and Metallurgy,2022,31(3):132−139.
|
| [21] |
王海洋,李金浜,郑仕跃,等. 拉剪作用下椭圆孔洞砂岩力学及破坏特征模拟研究[J]. 煤炭科学技术,2023,51(8):86−96.
WANG Haiyang,LI Jinbang,ZHENG Shiyue,et al. Simulation on mechanical and failure characteristics of sandstone with elliptical hole under tension-shear effect[J]. Coal Science and Technology,2023,51(8):86−96.
|
| [22] |
张村,贾胜,王方田,等. 水岩作用下煤体孔裂隙结构演化特征及驱动机制实验研究[J]. 应用基础与工程科学学报,2023,31(1):185−196.
ZHANG Cun,JIA Sheng,WANG Fangtian,et al. An experimental research on the pore and fracture evolution characteristics and its driving mechanism for coal samples under water-rock interaction[J]. Journal of Basic Science and Engineering,2023,31(1):185−196.
|
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