长壁局部柔性充填开采浅埋煤层隔水层下沉量研究
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摘要
采用长壁局部柔性充填开采方法是实现浅埋煤层特殊保水开采的有效途径,研究在不同充填宽度与间隔宽度的柔性局部充填开采条件下,影响隔水层下沉量关键因素,对于确定合理局部充填参数,指导局部充填开采实践具有十分重要的理论和实践意义。基于物理相似模拟实验,得出隔水层的最大下沉量为充填体的压缩量和充填体上方支撑岩柱的下沉量以及基岩隔水层的下沉量三者之和。其中,基岩隔水层的下沉量与基岩隔水层厚度负相关,随着充填宽度的减小,基岩隔水层下沉量曲线呈类似双曲线形状向上发展。通过对隔水层下沉量数学模型分析表明,得到的结果与物理相似模拟实验基本吻合,可为浅埋煤层特殊保水开采区局部充填开采提供理论依据。
The application of the longwall local flexible backfill mining method could be an effective access to realize the special water keeping mining in the shallow depth seam. Under the flexible local backfill mining conditions with different backfill width and the interval width,the key factors affected to the subsidence value of the aquifuge were studied and would have very important theoretical and practical significances to the determination of the rational local backfill parameter and to the guidance of the local backfill mining practices. Based on the physical similar simulation experiment,the max subsidence value of the aquifuge obtained was the sum between the compression value of the backfill mass,the subsidence value of the support rock pillar above the backfill mass and the subsidence value of the base rock aquifuge. Among the three values,the subsidence value of the base rock aquifuge was negative related to the thickness of the base rock aquifuge and with the backfill width reduced,the subsidence value curve of the base rock aquifuge would be a upward development similar in a dual curve form. The analysis on the mathematic model of the aquifuge subsidence value showed that the results obtained were basically fitted with the physic similar simulation experiment and could provide the theoretical basis to the local backfill mining in a special water keeping mining area of the shallow depth seam.
The application of the longwall local flexible backfill mining method could be an effective access to realize the special water keeping mining in the shallow depth seam. Under the flexible local backfill mining conditions with different backfill width and the interval width,the key factors affected to the subsidence value of the aquifuge were studied and would have very important theoretical and practical significances to the determination of the rational local backfill parameter and to the guidance of the local backfill mining practices. Based on the physical similar simulation experiment,the max subsidence value of the aquifuge obtained was the sum between the compression value of the backfill mass,the subsidence value of the support rock pillar above the backfill mass and the subsidence value of the base rock aquifuge. Among the three values,the subsidence value of the base rock aquifuge was negative related to the thickness of the base rock aquifuge and with the backfill width reduced,the subsidence value curve of the base rock aquifuge would be a upward development similar in a dual curve form. The analysis on the mathematic model of the aquifuge subsidence value showed that the results obtained were basically fitted with the physic similar simulation experiment and could provide the theoretical basis to the local backfill mining in a special water keeping mining area of the shallow depth seam.
引文
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[3]宋振骐,崔增娣,夏洪春,等.无煤柱矸石充填绿色安全高效开采模式及其工程理论基础研究[J].煤炭学报,2010,35(5):706~710.
[4]张文忠.浅埋煤层隔水层稳定性的模拟实验研究[D].西安:西安科技大学,2007.
[5]黄庆享.浅埋煤层保水开采隔水层稳定性的模拟研究[J].岩石力学与工程学报,2009,28(5):988~992.
[6]王双明,黄庆享,范立民,等.生态脆弱区煤炭开发与生态水位保护[M].北京:科学出版社,2010.
[7]李文平,叶贵钧,张莱,等.陕北榆神府矿区保水采煤工程地质条件研究[J].煤炭学报,2000,25(5):449~454.
[8]刘素华.浅埋煤层局部充填开采上覆岩层岩移规律的数学模型研究[D].西安:西安科技大学,2010.
[9]吴立新,王金庄.建(构)筑物下压煤条带开采理论与实践[M].徐州:中国矿业大学出版社,1995.
[10]煤炭科学研究院,北京开采研究所.煤矿地表移动与覆岩破坏规律及其应用[M].北京:煤炭工业出版社,1981.
[11]徐永圻.煤矿开采学[M].徐州:中国矿业大学出版社,1999.