煤层底板注浆加固效果波速探查与评价
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摘要
底板注浆加固与含水层改造是承压水体上煤层安全开采底板岩溶水害防治的有效方法之一。为了评价煤层底板注浆加固效果,以皖北恒源煤矿Ⅱ615工作面为研究对象,采用钻孔震波检层法,选择正常区域和异常区域,分别对各区域注浆前后底板岩体进行了波速探测,结果表明:注浆前,正常、异常区域波速存在较大差异,注浆后两者基本一致;注浆后底板砂岩段岩层波速增加明显,约为注浆前的1.20倍,而海相泥岩段注浆前后波速变化不大,这与钻孔揭露岩芯的完整性和底板水无上升现象一致,充分说明注浆对裂隙岩体起到了很好的加固作用。
The grouting reinforcement of the coal seam floor and the construction of aquifers are effective methods in preventing and controlling of karstic water disaster in the coal seam floor above the confined aquifer during safe mining.In order to evaluate the effect of grouting reinforcement in the coal seam floor,the authors set the Ⅱ615 working face of the Hengyuan coal mine in northern Anhui Province as the study object and selected normal regions as well as abnormal regions.In addition,wave velocity detection was conducted for floor rocks before and after grouting in each region respectively by logging with seismic wave in drill holes.The results show that there is a considerable difference in wave velocity between the normal and abnormal regions before grouting,and the wave velocities in the two regions are basically the same after grouting.The wave velocity of floor sandstone strata rises obviously after grouting and it is 1.2 times the wave velocity before grouting.However,the wave velocities of marine mudstone change only insignificantly before and after grouting,which is in accordance with the completeness of rock core and non-guide rise exposed by drill holes.All this fully indicates that grouting could play a good role in the reinforcement of crack rocks.
The grouting reinforcement of the coal seam floor and the construction of aquifers are effective methods in preventing and controlling of karstic water disaster in the coal seam floor above the confined aquifer during safe mining.In order to evaluate the effect of grouting reinforcement in the coal seam floor,the authors set the Ⅱ615 working face of the Hengyuan coal mine in northern Anhui Province as the study object and selected normal regions as well as abnormal regions.In addition,wave velocity detection was conducted for floor rocks before and after grouting in each region respectively by logging with seismic wave in drill holes.The results show that there is a considerable difference in wave velocity between the normal and abnormal regions before grouting,and the wave velocities in the two regions are basically the same after grouting.The wave velocity of floor sandstone strata rises obviously after grouting and it is 1.2 times the wave velocity before grouting.However,the wave velocities of marine mudstone change only insignificantly before and after grouting,which is in accordance with the completeness of rock core and non-guide rise exposed by drill holes.All this fully indicates that grouting could play a good role in the reinforcement of crack rocks.
引文
[1]吴玉华,赵开全,孙本魁.底板灰岩承压水上开采安全技术实践及认识[J].煤矿开采,2009,14(4):40-42,87.
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[14]王观石,程渭民,胡世丽.波速和衰减对岩石力学参数和岩体结构变化的敏感性研究[J].现代矿业,2010,(4):36-39.
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[2]韩云春.基于采动效应研究的注浆工作面底板突水危险性评价[D].淮南:安徽理工大学,2011.
[3]陈金方,于景村,李全,等.矿井TEM探测导水陷落柱及检测注浆效果[J].江苏煤炭,2002(4):7-8.
[4]刘志新,于景村,郭栋.矿井瞬变电磁法在水文钻孔探测中的应用[J].物探与化探,2006,30(1):59-61.
[5]于景邨,胡兵,刘振庆,等.矿井瞬变电磁探测技术的应用[J].物探与化探,2011,35(4):532-535.
[6]王德全,蒋宗霖,于景邨.全空间瞬变电磁法技术探查底板水及注浆检测[J].工程勘察,2012,(10):92-95.
[7]廖俊杰,于景邨,胡兵,等.矿井瞬变电磁超前探测数据处理与显示技术[J].物探与化探,2011,35(3):423-426.
[8]刘盛东,吴荣新,张平松,等.三维并行电法勘探技术与矿井水害探查[J].煤炭学报,2009,34(7):927-932.
[9]李承军.并行三维电法在底板灰岩水防治工作中的应用[J].煤矿开采,2011,16(4):113-115.
[10]国家安全生产监督管理局,国家煤矿安全监察局.煤矿防治水规定[M].北京:煤炭工业出版社,2009.
[11]吴基文,张朱亚,赵开全,等.淮北矿区高承压岩溶水体上采煤底板水害防治措施[J].华北科技学院学报,2009,6(4):83-86.
[12]牛滨华,孙春岩.半无限空间各向同性黏弹性介质与地震波传播[M].北京:地质出版社,2007.
[13]李新伟,王晓飞.应用超声波与芯样强度对旧桥桩底基岩完整性评价[J].路基工程,2011,(4):54-56,59.
[14]王观石,程渭民,胡世丽.波速和衰减对岩石力学参数和岩体结构变化的敏感性研究[J].现代矿业,2010,(4):36-39.
[15]吴基文.煤岩抗拉强度综合测试与评价[M].北京:中国科学技术出版社,2003.
[16]吴基文,姜振泉,樊成,等.煤层抗拉强度的波速测定研究[J].岩土工程学报,2005,27(9):999-1003.
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