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首页> 外文会议>The 6th international conference on mining science amp; technology (ICMST2009) >Microscopic characteristics of microfractures in coals: an investigation into permeability of coal
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Microscopic characteristics of microfractures in coals: an investigation into permeability of coal

机译：煤中微裂缝的微观特征：煤渗透性研究

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摘要

This study aims at identifying the microfractures characteristics and their significances to gas permeability in coals. The microscopic measurements of 189 polished coal surfaces show that there are commonly two kinds of microfractures: the exo-microfracture formed by tectonic stress and the endo-microfracture formed within certain macerals as the result of peat formation and coalification. The exo-microfractures are commonly densely developed, with typical textures of irregular dendritic, filamentous, turtleback, and typical frequency of hundreds per 9 cm2. Comparably, the endo-microfractures commonly have the frequency< 100 per 9 cm2. It has been confirmed that endo-microfractures are generally developed with regular texture, good connectivity and orientation, and thus are favorable for gas permeability. Some overdeveloped exo-microfractures (>200 per 9 cm2) with filamentous texture are mostly formed by intensive tectonic stress, and are indicators for "outburst-prone coals". The highly microfractured coals have poor connectivity and orientation, and thus are unfavorable for permeability and gas production.
机译：本研究旨在确定微裂缝特征及其对煤中气体渗透性的意义。 189个抛光煤表面的显微测量结果表明，通常存在两种微裂缝：构造应力形成的外微裂缝和由于泥炭形成和煤化而在某些微晶内形成的内微裂缝。外微裂纹通常密集地发展，具有不规则的树枝状，丝状，龟背状的典型纹理，并且典型频率为每9 cm2数百个。相比之下，内层微裂缝的频率通常<9/100 cm2。已经证实，内部微裂缝通常具有规则的织构，良好的连通性和取向，因此有利于透气性。一些具有丝状质地的过度发展的外微破裂（> 200/9 cm2）主要由强烈的构造应力形成，是“易爆煤”的指示。高度微裂的煤的连通性和方向性差，因此不利于渗透性和产气。

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