煤层顶板砂岩在高温下的力学特性及破坏机理
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摘要
采用偏光显微镜、扫描电镜及岩石力学试验系统等仪器设备研究了煤层顶板砂岩在常温到1200℃范围内的力学特性和破坏机理。结果表明,煤层顶板砂岩在加热过程中强度急剧降低的温度与岩石内部裂隙形成和晶体形态变化的温度基本一致,说明岩石微观结构在高温下的变化对其力学特性有显著影响;煤层顶板砂岩中有机物在高温下的分解和析出,对砂岩中裂隙形成与发展具有一定的影响,该砂岩在高温作用下的破坏是晶体晶型转变和膨胀等产生的热应力及有机物析出共同作用的结果。
The Mechanical characteristics and cracking mechanismofcoalroofsandstoneunderroomtemperaturethe1 200 ℃ high temperature has been researched with a polarizing microscope , SEM and rock mechanical test equipment. The researches discovere that the temperature at which the strength of the sandstone decreased sharply during the sandstone was heated was the same as that of the crack forming in the sandstone and crystal form transition. The results indicated that the change of the sandstone microstructure under the high temperature affected obviously the mechanical characteristics of sandstone; the decomposition of organic matter in the sandstone and the migration of the decomposing products affected the forming and expanding of the cracks. The destroying of the sandstone under high temperature results from crystal form transition and crystal volumetric expansion, the migration of the decomposing products.
The Mechanical characteristics and cracking mechanismofcoalroofsandstoneunderroomtemperaturethe1 200 ℃ high temperature has been researched with a polarizing microscope , SEM and rock mechanical test equipment. The researches discovere that the temperature at which the strength of the sandstone decreased sharply during the sandstone was heated was the same as that of the crack forming in the sandstone and crystal form transition. The results indicated that the change of the sandstone microstructure under the high temperature affected obviously the mechanical characteristics of sandstone; the decomposition of organic matter in the sandstone and the migration of the decomposing products affected the forming and expanding of the cracks. The destroying of the sandstone under high temperature results from crystal form transition and crystal volumetric expansion, the migration of the decomposing products.
引文
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[2]杨和兰,梁杰.煤炭地下气化燃空区范围TEM探测方法[J].南京理工大学学报,2001,25(2):200-204.
[3]徐永生.论煤炭地下气化对煤层地质条件的适应性[J].天津城市建设学院学报,1995,1(4):6-11.
[4]张晶瑶,马万昌,张凤鹏,等.高温条件下岩石结构特征的研究[J].东北大学学报(自然科学版),1996,17(1):5-9.
[5]崔元星,魏月红.煤炭地下气化过程的地球物理监测[J].中国煤炭,1997,23(3):35-36.
[6]刘斌.不同温压下岩石弹性波速、衰减及各向异性与组构的关系[J].地学前缘,2000,7(1):247-257.
[7]孙天泽.高围压条件下岩石力学性质的温度效应[J].地球物理学进展,1996,11(4):63-70.
[8]方华,伍向阳.温压条件下岩石破坏前后的力学性质与波速[J].地球物理学进展,1999,14(3):73-78.
[9]北野晃一,新孝一,木下直人,等.高温下岩石力学特性、热特性和渗透特性的综合评述[J]世界地震译丛,1991,10(1):59-68.
[10]高琼英,张智强.高岭石矿物高温相变过程及其火山灰活性[J].硅酸盐学报,1989,17(6):541-548.
[11]张智强.高岭石在680～980℃之间的结构变化及其产物的研究[J].中国搪瓷,1995,16(6):15-20.
[12]刘桂建,王俊新,杨萍钥,等.煤中矿物质及其燃烧后的变化分析[J].燃料化学学报,2003,31(3):216-230.
[13]张培萍郭树平.黑云母的差热分析和红外光谱研究[J].长春地质学院学报,1996,26(1):99-101.
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