基于Micro-CT的受载煤岩裂隙孔隙时空演化规律

doi:10.13722/j.cnki.jrme.2021.0423

摘要
图/表
参考文献
相关文章 (6)

全文: PDF (4059 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要 As the main channel for fluid seepage，the fractured pores of coal have an important influence on the permeability of coal by their expansion and connection evolution laws under the action of mining stress. In order to reveal the evolution of the micro-fracture and pore structure characteristics of coal with axial stress loading，this paper used the NanoVoxel-3502E X-ray three-dimensional scanning imaging system and Deben loading test device to carry out the micro-CT in-situ scanning test of coal uniaxial compression. Acquired real-time CT data under different strain conditions，extracted the pores and fractures distribution characteristics of the coal sample，defined voidage and evenly divided the coal sample into three parts(region 1，region 2 and region 3) according to the stage of the voidage curve，and analyzed the evolution law of coal sample meso-structure with axial stress. The results show that that the uniaxial compression of coal presents staged fractures，and the distribution characteristics of fractures and pores are closely related to the internal stress propagation. The force transmission under uniaxial compression caused region 2 to appear first as the fractures and pores developed，followed by the development of region 1 near the axial stress loading indenter and connected fractures and pores，and at the peak (1 100 N) and after failure(492 N)，the maximum volume and surface area of pores and fractures and voidage were the largest，while the fractures and pores of region 3 near the axial fixed indenter developed relatively slowly，and the maximum volume and surface area of pores and fractures and voidage were the smallest. The coal matrix(skeleton) was locally deformed and destroyed under the action of axial force，formed isolated pores and tiny fractures，and the spatial distribution of the fractures and pores aggravated the unevenness of the internal stress distribution in the coal，which in turn had a great impact on the process of coal rock fracture.

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	杨琪1
	2
	于岩斌1
	2
	程卫民1
	2
	张鑫1
	2
	郑磊3
	崔文亭1
	2
	邢浩1
	2

关键词 ： rock mechanics, Micro-CT, uniaxial compression, in-situ test, meso-structure

Abstract：As the main channel for fluid seepage，the fractured pores of coal have an important influence on the permeability of coal by their expansion and connection evolution laws under the action of mining stress. In order to reveal the evolution of the micro-fracture and pore structure characteristics of coal with axial stress loading，this paper used the NanoVoxel-3502E X-ray three-dimensional scanning imaging system and Deben loading test device to carry out the micro-CT in-situ scanning test of coal uniaxial compression. Acquired real-time CT data under different strain conditions，extracted the pores and fractures distribution characteristics of the coal sample，defined voidage and evenly divided the coal sample into three parts(region 1，region 2 and region 3) according to the stage of the voidage curve，and analyzed the evolution law of coal sample meso-structure with axial stress. The results show that that the uniaxial compression of coal presents staged fractures，and the distribution characteristics of fractures and pores are closely related to the internal stress propagation. The force transmission under uniaxial compression caused region 2 to appear first as the fractures and pores developed，followed by the development of region 1 near the axial stress loading indenter and connected fractures and pores，and at the peak (1 100 N) and after failure(492 N)，the maximum volume and surface area of pores and fractures and voidage were the largest，while the fractures and pores of region 3 near the axial fixed indenter developed relatively slowly，and the maximum volume and surface area of pores and fractures and voidage were the smallest. The coal matrix(skeleton) was locally deformed and destroyed under the action of axial force，formed isolated pores and tiny fractures，and the spatial distribution of the fractures and pores aggravated the unevenness of the internal stress distribution in the coal，which in turn had a great impact on the process of coal rock fracture.

引用本文:

杨琪1，2，于岩斌1，2，程卫民1，2，张鑫1，2，郑磊3，崔文亭1，2，邢浩1，2. 基于Micro-CT的受载煤岩裂隙孔隙时空演化规律[J]. 岩石力学与工程学报, 2022, 41(S1): 2626-2638.
YANG Qi1，2，YU Yanbin1，2，CHENG Weimin1，2，ZHANG Xin1，2，ZHENG Lei3，CUI Wenting1，2，XING Hao1， 2. Micro-CT-based temporal and spatial evolution of fractures and pores in loaded coal. , 2022, 41(S1): 2626-2638.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0423 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2626

[5]	FAKHIMI A，HEMAMI B. Rock uniaxial compression test and axial splitting[J]. Procedia Engineering，2017，191：623-630.
[35]	SHI X，PAN J，HOU Q，et al. Micrometer-scale fractures in coal related to coal rank based on micro-CT scanning and fractal theory[J]. Fuel，2018，212：162-172.
[18]	WANG Y，WANG L，MENG F，et al. Strength test of 3D printed artificial rock mass with pre-existing fracture[J]. Underground Space，2020，(6)：492-505.
[27]	MATHEWS J P，CAMPBELL Q P，XU H，et al. A review of the application of X-ray computed tomography to the study of coal[J]. Fuel，2017，209：10-24.
[7]	赵东，冯增朝，赵阳升. 微型单轴煤岩试验机的研制及试验研究[J]. 岩石力学与工程学报，2010，29(7)：1 314-1 322.(ZHAO Dong，FENG Zengchao，ZHAO Yangsheng. Development and experimental research of micro-uniaxial coal and rock testing machine[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(7)：1 314- 1 322.(in Chinese))
[9]	赵阳，周宏伟，任伟光，等. 循环荷载下深部煤层工作面顶板砂岩的渗透率演化规律[J]. 煤炭学报，2019，44(5)：1 495-1 507. (ZHAO Yang，ZHOU Hongwei，REN Weiguang，et al. Permeability evolution law of roof sandstone in deep coal seam working face under cyclic loading[J]. Journal of China Coal Society，2019，44(5)：1 495-1 507. (in Chinese))
[17]	XIA Y，ZHANG C，ZHOU H，et al. Mechanical behavior of structurally reconstructed irregular columnar jointed rock mass using 3D printing[J]. Engineering Geology，2020，268：105509.
[19]	SUN X，LI X，ZHENG B，et al. Study on the progressive fracturing in soil and rock mixture under uniaxial compression conditions by CT scanning[J]. Engineering Geology，2020，279：105884.
[29]	ZHAO Y，XUE S，HAN S，et al. Effects of microstructure on water imbibition in sandstones using X-ray computed tomography and neutron radiography[J]. Journal of Geophysical Research-solid Earth，2017，122(7)：4 963-4 981.
[4]	李文帅，王连国，陆银龙，等. 真三轴条件下砂岩强度、变形及破坏特征试验研究[J]. 采矿与安全工程学报，2019，36(1)：191-197.(LI Wenshuai，WANG Lianguo，LU Yinlong，et al. Experimental study on strength，deformation and failure characteristics of sandstone under true triaxial conditions[J]. Chinese Journal of Mining and Safety Engineering，2019，36(1)：191-197. (in Chinese))
[14]	DU K，LI X，TAO M，et al. Experimental study on acoustic emission (AE) characteristics and crack classification during rock fracture in several basic lab tests[J]. International Journal of Rock Mechanics and Mining Sciences，2020，133：104411.
[24]	朱红光，谢和平，易成，等. 岩石材料微裂隙演化的CT识别[J]. 岩石力学与工程学报，2011，30(6)：1 230-1 238.(ZHU Hongguang，XIE Heping，YI Cheng，et al. CT identification of microfracture evolution in rock materials[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(6)：1 230-1 238.(in Chinese))
[34]	王登科，张平，魏建平，等. CT可视化的受载煤体三维裂隙结构动态演化试验研究[J]. 煤炭学报，2019，44(增2)：574-584. (WANG Dengke，ZHANG Ping，WEI Jianping，et al. Experimental study on dynamic evolution of three-dimensional fracture structure of loaded coal body by CT visualization[J]. Journal of China Coal Society，2019，44(Supp.2)：574-584.(in Chinese))
[2]	ALIABADIAN Z，SHARAFISAFA M，TAHMASEBINIA F，et al. Experimental and numerical investigations on crack development in 3D printed rock-like specimens with pre-existing flaws[J]. Engineering Fracture Mechanics，2020，241：107396.
[12]	刘佳亮，张娣，王梦瑾. 水力冲击混凝土裂纹扩展机理及CT尺度损伤研究[J]. 振动与冲击，2019，38(11)：68-74.(LIU Jialiang，ZHANG Di，WANG Mengjin. Study on crack propagation mechanism and CT scale damage of hydraulically impacted concrete[J]. Vibration and Shock，2019，38(11)：68-74.(in Chinese))
[22]	葛修润，任建喜，蒲毅彬，等. 煤岩三轴细观损伤演化规律的CT动态试验[J]. 岩石力学与工程学报，1999，18(5)：497-502.(GE Xiurun，REN Jianxi，PU Yibin，et al. CT dynamic test of triaxial mesoscopic damage evolution law of coal and rock[J]. Chinese Journal of Rock Mechanics and Engineering，1999，18(5)：497-502. (in Chinese))
[32]	侯志强，王宇，刘冬桥，等. 三轴疲劳-卸围压条件下大理岩力学特性试验研究[J]. 岩土力学，2020，41(5)：1 510-1 520.(HOU Zhiqiang，WANG Yu，LIU Dongqiao，et al. Experimental study on mechanical properties of marble under triaxial fatigue-relief confining pressure[J]. Rock and Soil Mechanics，2020，41(5)：1 510-1 520.(in Chinese))
[10]	伍天华，周喻，王莉，等. 单轴压缩条件下岩石孔-隙相互作用机制细观研究[J]. 岩土力学，2018，39(增2)：463-472.(WU Tianhua，ZHOU Yu，WANG Li，et al. Mesoscopic study on the mechanism of rock pore-void interaction under uniaxial compression[J]. Rock and Soil Mechanics，2018，39(2)：463-472.(in Chinese))
[20]	LI Y，CUI H，ZHANG P，et al. Three-dimensional visualization and quantitative characterization of coal fracture dynamic evolution under uniaxial and triaxial compression based on CT scanning[J]. Fuel，2020，262：116568.
[30]	WANG G，QIN X，SHEN J，et al. Quantitative analysis of microscopic structure and gas seepage characteristics of low-rank coal based on CT three-dimensional reconstruction of CT images and fractal theory[J]. Fuel，2019，256：115900.
[40]	LIU J，WANG R，LEI G，et al. Studies of stress and displacement distribution and the evolution law during rock failure process based on acoustic emission and microseismic monitoring[J]. International Journal of Rock Mechanics and Mining Sciences，2020，132：104384.
[15]	SINGH A，KUMAR C，KANNAN L G，et al. Estimation of creep parameters of rock salt from uniaxial compression tests[J]. International Journal of Rock Mechanics and Mining Sciences，2018，107：243-248.
[25]	王彦琪，冯增朝，郭红强，等. 基于图像检索技术的岩石单轴压缩破坏过程CT描述[J]. 岩土力学，2013，34(9)：2 534-2 540.(WANG Yanqi，FENG Zengchao，GUO Hongqiang，et al. CT description of rock uniaxial compression failure process based on image retrieval technology[J]. Rock and Soil Mechanics，2013，34(9)：2 534-2 540. (in Chinese))
[37]	SUN X，TAKEDA S，WISNOM M，et al. In situ characterization of trans-laminar fracture toughness using X-ray computed tomography[J]. Composites Communications，2020：100408.
[39]	WANG Y，HOU Z Q，HU Y Z. In situ X-ray micro-CT for investigation of damage evolution in black shale under uniaxial compression[J]. Environmental Earth Sciences，2018，77(20)：717.
[45]	EREMIN M. Three-dimensional finite-difference analysis of deformation and failure of weak porous sandstones subjected to uniaxial compression[J]. International Journal of Rock Mechanics and Mining Sciences，2020，133：104412.
[1]	ZHAO Y，GAO Y，WU S. Influence of different concealment conditions of parallel double flaws on mechanical properties and failure characteristics of brittle rock under uniaxial compression[J]. Theoretical and Applied Fracture Mechanics，2020，109：102751.
[3]	刘树新，邢杰，郑旭，等. 岩石轴压CT图像的分区损伤信息与临界破坏识别[J]. 岩土工程学报，2021，43(3)：432-438.(LIU Shuxin，XING Jie，ZHENG Xu，et al. Zonal damage information and critical failure identification of rock axial compression CT images[J]. Chinese Journal of Geotechnical Engineering，2021，43(3)：432-438. (in Chinese))
[6]	郎颖娴，梁正召，董卓. 玄武岩三维细观孔隙模型重构与直接拉伸数值试验[J]. 工程科学学报，2019，41(8)：997-1 006.(LANG Yingxian，LIANG Zhengzhao，DONG Zhuo. Reconstruction of 3D meso-pore model and direct tensile numerical test of basalt[J]. Chinese Journal of Engineering Science，2019，41(8)：997-1 006.(in Chinese))
[8]	WANG Y，ZHANG H，LIN H，et al. Fracture behaviour of central-flawed rock plate under uniaxial compression[J]. Theoretical and Applied Fracture Mechanics，2020，106：102503.
[11]	刘圣鑫，王宗秀，张林炎，等. 页岩微观组构特征对复杂裂缝网络形成的影响[J]. 采矿与安全工程学报，2019，36(2)：420-428.(LIU Shengxin，WANG Zongxiu，ZHANG Linyan，et al. Effects of shale microfabric characteristics on the formation of complex fracture networks[J]. Chinese Journal of Mining and Safety Engineering，2019，36(2)：420-428.(in Chinese))
[13]	郎颖娴，梁正召，段东，等. 基于CT试验的岩石细观孔隙模型重构与并行模拟[J]. 岩土力学，2019，40(3)：1 204-1 212.(LANG Yingxian，LIANG Zhengzhao，DUAN Dong，et al. Reconstruction and parallel simulation of rock mesopore model based on CT test[J]. Rock and Soil Mechanics，2019，40(3)：1 204-1 212.(in Chinese))
[16]	GOMEZ-HERAS M，BENAVENTE D，PLA C，et al. Ultrasonic pulse velocity as a way of improving uniaxial compressive strength estimations from Leeb hardness measurements[J]. Construction and Building Materials，2020，261：119996.
[21]	孟巧荣，赵阳升，胡耀青. 微焦点显微CT在煤岩热解中的应用[J]. 煤炭学报，2013，38(3)：430-434.(MENG Qiaorong，ZHAO Yangsheng，HU Yaoqing. Application of micro-focus micro-CT in coal and rock pyrolysis[J]. Journal of China Coal Society，2013，38(3)：430-434.(in Chinese))
[23]	尹光志，黄滚，代高飞，等. 基于CT数的煤岩单轴压缩破坏的分叉与混沌分析[J]. 岩土力学，2006，27(9)：1 465-1 470.(YIN Guangzhi，HUANG Gun，DAI Gaofei，et al. Bifurcation and Chaos analysis of coal and rock uniaxial compression failure based on CT numbers[J]. Rock and Soil Mechanics，2006，27(9)：1 465-1 470.(in Chinese))
[26]	JING Y，ARMSTRONG R T，RAMANDI H L，et al. Topological characterization of fractured coal[J]. Journal of Geophysical Research：Solid Earth，2017，122(12)：9 849-9 861.
[28]	段永婷，冯夏庭，李晓. 页岩细观矿物条带对其宏观破坏模式的影响研究[J]. 岩石力学与工程学报，2021，40(1)：43-52.(DUAN Yongting，FENG Xiating，LI Xiao. Influence of shale meso-mineral strips on its macroscopic failure mode[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(1)：43-52.(in Chinese))
[31]	王本鑫，金爱兵，赵怡晴，等. 卸围压条件下花岗岩强度特性及三维裂隙演化规律[J]. 哈尔滨工业大学学报，2020，52(11)：137-146.(WANG Benxin，JIN Aibing，ZHAO Yiqing，et al. Strength characteristics and three-dimensional fracture evolution law of granite under the condition of unloading confining pressure[J]. Journal of Harbin Institute of Technology，2020，52(11)：137-146.(in Chinese))
[33]	王登科，曾凡超，王建国，等. 显微工业CT的受载煤样裂隙动态演化特征与分形规律研究[J]. 岩石力学与工程学报，2020，39(6)：1 165-1 174.(WANG Dengke，ZENG Fanchao，WANG Jianguo，et al. Research on the dynamic evolution characteristics and fractal law of fractures in loaded coal samples by micro-industrial CT[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(6)：1 165-1 174.(in Chinese))
[36]	王登科，李文睿，魏建平，等. 基于分形表征的粗糙微纳米孔隙瓦斯气体传输方程[J]. 煤炭学报，2019，44(11)：3 432-3 440.(WANG Dengke，LI Wenrui，WEI Jianping，et al. Gas transport equation in rough micro-nano pores based on fractal characterization[J]. Journal of China Coal Society，2019，44(11)：3 432-3 440.(in Chinese))
[38]	ZHANG G，RANJITH P G，LIANG W，et al. Stress-dependent fracture porosity and permeability of fractured coal：An in-situ X-ray tomography study[J]. International Journal of Coal Geology，2019，213：103279.
[41]	NICKSIAR M，MARTIN C D. Evaluation of methods for determining crack initiation in compression tests on low-porosity rocks[J]. Rock Mechanics and Rock Engineering，2012，45(4)：607-617.
[42]	薛东杰，唐麒淳，王傲，等. 煤岩微观相态FCN智能识别与分形重构[J]. 岩石力学与工程学报，2020，39(6)：1 203-1 221.(XUE Dongjie，TANG Qichun，WANG Ao，et al. FCN intelligent recognition and fractal reconstruction of coal and rock microphase state[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(6)：1 203-1 221.(in Chinese))
[44]	尹升华，陈勋，刘超，等. 矿石颗粒级配对堆浸体系三维孔隙结构的影响[J]. 工程科学学报，2020，42(8)：972-979.(YIN Shenghua，CHEN Xun，LIU Chao，et al. Effect of ore particle size on three-dimensional pore structure of heap leaching system[J]. Chinese Journal of Engineering Science，2020，42(8)：972-979.(in Chinese))
[46]	DIEDERICHS M S，KAISER P K，EBERHARDT E. Damage initiation and propagation in hard rock during tunnelling and the influence of near-face stress rotation[J]. International Journal of Rock Mechanics and Mining Sciences，2004，41(5)：785-812.
[43]	周动，冯增朝，王辰，等. 煤吸附甲烷结构变形的多尺度特征[J]. 煤炭学报，2019，44(7)：2 159-2 166.(ZHOU Dong，FENG Zengchao，WANG Chen，et al. Multi-scale characteristics of structural deformation of coal adsorption of methane[J]. Journal of China Coal Society，2019，44(7)：2 159-2 166.(in Chinese))