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.
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))
<body>Your browse does not support frame!</body>
2010, Vol. 29 
