Numerical simulation of pore structure stress characteristics of coal and rock mass

WANG Gang; JIANG Chenghao; CHEN Xuechang

doi:10.3969/j.issn.1001-1986.2021.01.006

Volume 49 Issue 1

Feb. 2021

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COAL GEOLOGY & EXPLORATION > 2021 > 49(1): 57-64,80. > DOI: 10.3969/j.issn.1001-1986.2021.01.006

WANG Gang, JIANG Chenghao, CHEN Xuechang. Numerical simulation of pore structure stress characteristics of coal and rock mass[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(1): 57-64,80. DOI: 10.3969/j.issn.1001-1986.2021.01.006

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Numerical simulation of pore structure stress characteristics of coal and rock mass

1. Mining Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao 266590, China;
2. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

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Received Date: October 24, 2020
Revised Date: December 27, 2020
Published Date: February 24, 2021

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Abstract

In order to explore the stress distribution around the pores of coal and rock mass under different loading modes, the skeleton model of coal and rock mass with different pore shapes was constructed through CT three-dimensional reconstruction technology, and uniaxial and triaxial compression experiment simulations were conducted using ABAQUS software. The results showed that under uniaxial compression, the upper and lower regions of spherical pores showed tensile stress concentration, while the left and right regions showed compressive stress concentration. The stress concentration types in the long and short axis of elliptic pores were distinct with different dip angles. Under uniaxial compression, axial loading velocity affected the maximum values of Mises stress and σ₁ stress around spherical pores. In the process of triaxial compression, the pore structure still went through four stages of compaction, elasticity, plasticity and failure. The lower confining pressure made the "stress-strain" curve and "stress-time" curve highly coincide in the elastic stage. This study provides a new method for the study of coal and rock mechanics from the microscopic point of view.
- CT three-dimensional reconstruction,
- pore structure,
- numerical simulation,
- uniaxial compression,
- three axis compression

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[1]	LIU Qiang,NIE Wen,HUA Yun,et al. Research on tunnel ventilation systems:dust diffusion and pollution behaviour by air curtains based on CFD technology and field measurement[J]. Building and Environment,2019,147:444-460.
[2]	ALEXEEV A D,REVVA V N,ALYSHEV N A,et al. True triaxial loading apparatus and its application to coal outburst prediction[J]. International Journal of Coal Geology,2004,58(4):245-250.
[3]	SUN Huan,LIU Xiaoli,ZHU J. B. Correlational fractal characterisation of stress and acoustic emission during coal and rock failure under multilevel dynamic loading[J]. International Journal of Rock Mechanics and Mining Sciences,2019,117:1-10.
[4]	LIU Shumin,LI Xuelong,LI Zhonghui,et al. Energy distribution and fractal characterization of Acoustic Emission(AE) during coal deformation and fracturing[J]. Measurement,2019,136:122-131.
[5]	ZHAO Jun,FENG Xiating,ZHANG Xiwei,et al. Brittle and ductile creep behavior of Jinping marble under true triaxial stress[J]. Engineering Geology,2019,258:105157.
[6]	屈丽娜,李波. 基于西原加速模型的煤体蠕变特性试验[J]. 煤田地质与勘探,2019,47(6):115-120. QU Lina,LI Bo. Nishihara acceleration model-based experiment of creep characteristics of coal[J]. Coal Geology & Exploration,2019,47(6):115-120.
[7]	RENNER J,EVANS B,SIDDIQI G. Dislocation creep of calcite aggregates[J]. Journal of Geophysical Research:Solid Earth,2002,107(B12).
[8]	余杰,刘晓辉,郝齐钧. 不同围压下煤岩声发射基本特性及损伤演化[J]. 煤田地质与勘探,2020,48(3):128-136. YU Jie,LIU Xiaohui,HAO Qijun. Acoustic emission characteristics and damage evolution of coal-rock under different confining pressures[J]. Coal Geology & Exploration,2020,48(3):128-136.
[9]	WU Mengmeng,WANG Jianfeng. Reassembling fractured sand particles using fracture-region matching algorithm[J]. Powder Technology,2018,338:55-66.
[10]	XU Hong,FENG Xiating,YANG Chengxiang,et al. Influence of initial stresses and unloading rates on the deformation and failure mechanism of Jinping marble under true triaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences,2019,117:90-104.
[11]	YANG Xinxiang,KURU E,GINGRAS M,et al. CT-CFD integrated investigation into porosity and permeability of neat early-age well cement at downhole condition[J]. Construction and Building Materials,2019,205:73-86.
[12]	DURR N,SAUER M,HIERMAIER S. A numerical study on mesoscale simulation of quartzite and sandstone under shock loading[J]. International Journal of Impact Engineering,2017,108:73-88.
[13]	ZHANG Shihuai,WU Shunchuan,DUAN Kang. Study on the deformation and strength characteristics of hard rock under true triaxial stress state using bonded-particle model[J]. Computers and Geotechnics,2019,112:1-16.
[14]	SUN Wei,HOU Kepeng,YANG Zhiquan,et al. X-ray CT three-dimensional reconstruction and discrete element analysis of the cement paste backfill pore structure under uniaxial compression[J]. Construction and Building Materials,2017,138:69-78.
[15]	丁鑫,肖晓春,吴迪,等. 不同加载路径煤岩破裂过程声-电荷复合信号特性[J]. 煤炭学报,2016,41(增刊2):359-368. DING Xin,XIAO Xiaochun,WU Di,et al. Study on compound signal characteristics of acoustic emission and charge induction in coal rock failure under different loading paths[J]. Journal of China Coal Society,2016,41(Sup.2):359-368.
[16]	ZHAO Yixin,SONG Honghua,LIU Shimin,et al. Mechanical anisotropy of coal with considerations of realistic microstructures and external loading directions[J]. International Journal of Rock Mechanics and Mining Sciences,2019,116:111-121.
[17]	SUN Huafei,YANG Yongming,JU Yang,et al. Numerical analysis of deformation,failure and energy release mechanisms of fractured coal rock under unloading conditions[J]. Journal of China Coal Society,2014,39(2):258-272.
[18]	PENG Jun,WONG L N Y,THE C I. A re-examination of slenderness ratio effect on rock strength:Insights from DEM grain-based modelling[J]. Engineering Geology,2018,246:245-254.
[19]	孙华飞,杨永明,鞠杨,等. 开挖卸荷条件下煤岩变形破坏与能量释放的数值分析[J]. 煤炭学报,2014,39(2):258-272. SUN Huafei,YANG Yongming,JU Yang,et al. Numerical analysis of deformation,failure and energy release mechanisms of fractured coal rock under unloading conditions[J]. Journal of China Coal Society,2014,39(2):258-272.
[20]	刘京红,姜耀东,赵毅鑫,等. 煤岩破裂过程CT图像的分形描述[J]. 北京理工大学学报,2012,32(12):1219-1222. LIU Jinghong,JIANG Yaodong,ZHAO Yixin,et al. Fractal description of coal damage process based on CT image[J]. Transactions of Beijing Institute of Technology,2012,32(12):1219-1222.
[21]	王会杰. 深部裂隙煤岩渗流性质的试验研究[D]. 北京:中国矿业大学(北京),2013. WANG Huijie. Experimental study of fluid seepage in fractured coal under simulated deep coal mining[D]. Beijing:China University of Mining and Technology(Beijing),2013.
[22]	王刚,杨鑫祥,张孝强,等. 基于CT三维重建与逆向工程技术的煤体数字模型的建立[J]. 岩土力学,2015,36(11):3322-3328. WANG Gang,YANG Xinxiang,ZHANG Xiaoqiang,et al. Establishment of digital coal model using computed tomography based on reverse engineering technology and three-dimensional reconstruction[J]. Rock and Soil Mechanics,2015,36(11):3322-3328.
[23]	王学滨. 加载速度对断层-围岩系统变形及快速回跳的影响[J]. 岩土力学,2006,27(2):242-246. WANG Xuebin. Numerical simulation of influence of loading rate on deformation characteristics and snap-back for fault band and elastic rock system[J]. Rock and Soil Mechanics,2006,27(2):242-246.
[24]	何俊,潘结南,王安虎. 三轴循环加卸载作用下煤样的声发射特征[J]. 煤炭学报,2014,39(1):84-90. HE Jun,PAN Jienan,WEANG Anhu. Acoustic emission characteristics of coal specimen under triaxial cyclic loading and unloading[J]. Journal of China Coal Society,2014,39(1):84-90.
[25]	FENG Junjun,WANG Enyuan,CHEN Xia,et al. Energy dissipation rate:An indicator of coal deformation and failure under static and dynamic compressive loads[J]. International Journal of Mining Science and Technology,2018,28(3):397-406.
[26]	彭瑞东,鞠杨,高峰,等. 三轴循环加卸载下煤岩损伤的能量机制分析[J]. 煤炭学报,2014,39(2):245-252. PENG Ruidong,JU Yang,GAO Feng,et al. Energy analysis on damage of coal under cyclical triaxial loading and unloading conditions[J]. Journal of China Coal Society,2014,39(2):245-252.
[27]	ZHAO Gaofeng,RUSSELL A R,ZHAO Xiaobao,et al. Strain rate dependency of uniaxial tensile strength in Gosford sandstone by the distinct lattice spring model with X-ray micro CT[J]. International Journal of Solids and Structures,2014,51(7/8):1587-1600.

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