不同温度下褐煤裂隙演化的显微CT试验研究

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (2243 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要利用显微CT系统直观地研究褐煤从20 ℃～600 ℃裂纹的演化扩展过程，对原生裂纹和新生微裂纹的扩展演化进行详细的分析研究。研究结果表明：20 ℃～100 ℃，褐煤热破裂程度中等，只有很少的微裂纹产生；100 ℃～300 ℃热破裂剧烈，原生裂纹扩展延伸，且产生许多微裂纹，新旧裂纹扩展、延伸、搭接形成裂隙网络；300 ℃～500 ℃裂纹的扩展很缓慢；500 ℃～600 ℃，裂纹有闭合的趋势。随温度升高，微裂纹易沿层理方向产生于软煤质中，止裂于硬质带边缘，部分垂直层理方向的裂纹会在硬质带边缘分叉后沿层理方向扩展，裂纹沿层理方向的扩展速度远大于垂直层理方向的。

	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

关键词 ：采矿工程, 褐煤, 显微CT, 热破裂, 演化特征

Abstract：The crack evolution of lignite from 20 ℃ to 600 ℃ is studied by using micro-CT system intuitively. The extension and evolution of original cracks and new microcracks are discussed in detail. The study results show as follows：(1) From 20 ℃ to 100 ℃，thermal cracking degree of lignite is moderate and just a few new microcracks initiate. (2) From 100 ℃ to 300 ℃，thermal cracking is acute；many new microcracks initiate and original cracks extend quickly. The original and new cracks spread，overlap and connect with each other and finally form a crack network. (3) From 300 ℃ to 500 ℃，the extension of microcrack is very slowly. (4) From 500 ℃ to 600 ℃，some microcracks have trend of closure. With the increase in temperature，the microcracks initiate in soft coal along the bedding of coal seam and are arrested to hard coal；some cracks perpendicular to bedding direction will split on the edge of hard coal layer and then extend along the bedding of coal seam. The extension rate of cracks parallel to bedding direction is greater than that perpendicular to bedding direction.

Key words： mining engineering lignite micro-CT thermal cracking evolution characteristics

收稿日期: 2010-04-30

引用本文:

孟巧荣，赵阳升，于艳梅，胡耀青. 不同温度下褐煤裂隙演化的显微CT试验研究[J]. 岩石力学与工程学报, 2010, 29(12): 2475-2483.
MENG Qiaorong，ZHAO Yangsheng，YU Yanmei，HU Yaoqing. MICRO-CT EXPERIMENTAL STUDY OF CRACK EVOLUTION OF LIGNITE UNDER DIFFERENT TEMPERATURES. , 2010, 29(12): 2475-2483.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2010/V29/I12/2475

[1]	冯增朝，赵阳升，吕兆兴，等. 二维孔隙裂隙双重介质逾渗规律研究[J]. 物理学报，2007，56(5)：2 796-2 801.(FENG Zengchao，ZHAO Yangsheng，LU Zhaoxing，et al. Study of percolation law of 2D porous and fractured double-medium[J]. Acta Physica Sinica，2007，56(5)：2 796-2 801.(in Chinese)) " target="_blank">
[2]	张慧. 煤孔隙的成因类型及其研究意义[J]. 煤炭学报，2001，26(1)：40-44.(ZHANG Hui. Genetical type of pores in coal reservoir and its research significance[J]. Journal of China Coal Society，2001，26(1)：40-44.(in Chinese)) " target="_blank">
[3]	姚艳斌，刘大锰，汤达祯，等. 沁水盆地煤储层微裂隙发育的煤岩学控制机制[J]. 中国矿业大学学报，2010，39(1)：6-13.(YAO Yanbin，LIU Dameng，TANG Dazhen，et al. Control mechanism of coal petrologic composition on the development of micro-fracture of coal reservoir in Qinshui basin[J]. Journal of China University of Mining and Technology，2010，39(1)：6-13.(in Chinese)) " target="_blank">
[4]	张松航，汤达祯，唐书恒，等. 鄂尔多斯盆地东缘煤层气储集与产出条件[J]. 煤炭学报，2009，34(10)：1 297-1 304.(ZHANG Songhang，TANG Dazhen，TANG Shuheng，et al. Preservation and deliverability characteristics of coal bed methane in east margin of Ordos basin[J]. Journal of China Coal Society，2009，34(10)：1 297-1 304.(in Chinese)) " target="_blank">
[5]	蒋宇静，李博，王刚，等. 岩石裂隙渗流特性试验研究的新进展[J]. 岩石力学与工程学报，2008，27(12)：2 377-2 386.(JIANG Yujing，LI Bo，WANG Gang，et al. New advances in experimental study on seepage characteristics of rock fractures[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(12)：2 377-2 386.(in Chinese)) " target="_blank">
[6]	康志勤，赵阳升，孟巧荣，等. 油页岩热破裂规律及显微CT实验研究[J]. 地球物理学报，2009，52(3)：842-848.(KANG Zhiqin，ZHAO Yangsheng，MENG Qiaorong，et al. Micro-CT experimental research on thermal cracking law of oil shale[J]. Chinese Journal of Geophysics，2009，52(3)：842-848.(in Chinese))
[7]	张渊，张贤，赵阳升. 砂岩的热破裂过程[J]. 地球物理学报，2005，48(3)：656-659.(ZHANG Yuan，ZHANG Xian，ZHAO Yangsheng. Process of sandstone thermal cracking[J]. Chinese Journal of Geophysics，2005，48(3)：656-659.(in Chinese))
[8]	张渊，万志军，赵阳升，等. 细砂岩热破裂规律的细观实验研究[J]. 辽宁工程技术大学学报(自然科学版)，2007，26(4)：529-531.(ZHANG Yuan，WAN Zhijun，ZHAO Yangsheng，et al. Meso-experiment study of fine sandstone thermal cracking laws[J]. Journal of Liaoning Technical University(Natural Science)，2007，26(4)：529-531.(in Chinese)) " target="_blank">
[9]	梁杰，冯银辉，张彦春，等. 褐煤地下气化制氢工艺的研究[J]. 化工学报，2004，55(增)：39-43.(LIANG Jie，FENG Yinhui，ZHANG Yanchun，et al. Study of hydrogen-producing technology through underground brown coal gasification[J]. Journal for Chemical Industry and Engineering，2004，55(Supp.)：39-43.(in Chinese)) " target="_blank">
[10]	赵阳升，杨栋，冯增朝，等. 多孔介质多场耦合作用理论及其在资源与能源工程中的应用[J]. 岩石力学与工程学报，2008，27(7)：1 321-1 328.(ZHAO Yangsheng，YANG Dong，FENG Zengchao，et al. Multi-field coupling theory of porous media and its applications to resources and energy engineering[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(7)：1 321-1 328.(in Chinese)) " target="_blank">
[11]	李志强，鲜学福，隆晴明，等. 不同温度应力条件下煤体渗透率试验研究[J]. 中国矿业大学学报，2009，38(4)：523-527.(LI Zhiqiang，XIAN Xuefu，LONG Qingming，et al. Experiment study of coal permeability under different temperatures and stresses[J]. Journal of China University of Mining and Technology，2009，38(4)：523-527.(in Chinese)) " target="_blank">
[12]	冯子军，万志军，赵阳升，等. 高温三轴应力下无烟煤、气煤煤体渗透特性的试验研究[J]. 岩石力学与工程学报，2010，29(4)：689-696.(FENG Zijun，WAN Zhijun，ZHAO Yangsheng，et al. Experimental study of permeability of anthracite and gas coal masses under high temperature and triaxial stress[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(4)：689-696.(in Chinese))
[13]	张玉涛，王德明，仲晓星，等. 煤孔隙分形特征及其随温度的变化规律[J]. 煤炭科技，2007，35(11)：73-76.(ZHANG Yutao，WANG Deming，ZHONG Xiaoxing，et al. Fractural characteristics of coal pore and its change law with temperature[J]. Coal Science and Technology，2007，35(11)：73-76. (in Chinese)) " target="_blank">
[14]	ZHAO Y S，QU F，WAN Z J，et al. Experimental investigation on correlation between permeability variation and pore structure during coal pyrolysis[J]. Transport in Porous Media，2010，82(2)：401-412.
[15]	曲方. 原位状态煤体热解及力学特性的试验研究[博士学位论文][D]. 徐州：中国矿业大学，2007.(QU Fang. Experimental study of thermal pyrolysis and mechanical characteristics of in-situ coal mass [Ph. D. Thesis][D]. Xuzhou：China University of Mining and Technology，2007.(in Chinese)) " target="_blank">
[16]	赵阳升，孟巧荣，康天合，等. 显微CT试验技术与花岗岩热破裂特征的细观研究[J]. 岩石力学与工程学报，2008，27(1)：28-34.(ZHAO Yangsheng，MENG Qiaorong，KANG Tianhe，et al. Micro-CT experimental technology and meso-investigation on thermal fracturing characteristics of granite[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(1)：28-34.(in Chinese))