煤岩多孔介质及其充瓦斯后的电特性研究
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摘要
电性质是煤岩的重要物理性质。开展煤岩多孔介质及其充瓦斯后电性质的研究,对煤与瓦斯动力灾害的有效预防及煤层气的勘探开发具有重要的意义。研究了煤岩多孔介质及其充瓦斯后的交流导电性。研究表明:煤岩多孔介质电导率随瓦斯压力的增大而增大,不含瓦斯时的电导率明显低于含瓦斯时的电导率;无论是否含瓦斯,电导率都随温度的升高而增大,并且相同条件下,含瓦斯比不含瓦斯的电导率要大;电导率与外加电压无关;随着频率的增大,电导率也相应增大,煤的交变电导率与频率间存在分形关系。
Coal-rock electrical properties are very important,which reflect coal inner structure and ingredients,and vary obviously when coal is pressed or destroyed. In the paper,the alternative characters of current electric conduction of rock-coal porous medium with gas are studied. It is concluded that the conductivity increases along with gas pressure,and conductivity of coal without gas is smaller than that of coal with gas,the conductivity increases along with temperature whether the coal contains gas or not,and the conductivity of coal with gas is bigger than that of coal without gas under same conditions. The conductivity is not variated with the voltage of alternative electric field. The conductivity increases along with the frequency of alternative electric field,and the relationship between conductivity and the frequency is fractal one. It is possible that coal and gas outburst can be predicted by monitoring the variation of coal conductivity along with the gas pressure or coal temperature.
Coal-rock electrical properties are very important,which reflect coal inner structure and ingredients,and vary obviously when coal is pressed or destroyed. In the paper,the alternative characters of current electric conduction of rock-coal porous medium with gas are studied. It is concluded that the conductivity increases along with gas pressure,and conductivity of coal without gas is smaller than that of coal with gas,the conductivity increases along with temperature whether the coal contains gas or not,and the conductivity of coal with gas is bigger than that of coal without gas under same conditions. The conductivity is not variated with the voltage of alternative electric field. The conductivity increases along with the frequency of alternative electric field,and the relationship between conductivity and the frequency is fractal one. It is possible that coal and gas outburst can be predicted by monitoring the variation of coal conductivity along with the gas pressure or coal temperature.
引文
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2Brac eWF.Furth erstudi es oft heeffe ct ofpressu reelectric alresistivi ty ofrocks[J].J.G.R.,1968,73(4):132～141
3MazzellaA.Electr icalresisti vityvarisit ionsassoci ated withearthq ua keontheSanAnd reasfault[J].Science,1974,185(41):1109～1118
4MorrowC.Elec tricalresis tivityc ha nges int uf fduetostress[J].J.G.R.,1981,86(2):1012～1019
5钱复业.地震前电阻率的异常变化[J].中国科学(B辑),1982,(9):212～219
6StopinsklW. Prec ursoryrockr esistivity variati on srelat edtominingtremors[J].ActaGeophys.Pol.,1982,30(4):367～379
7陈季丹,刘子玉.电介质物理学[M].北京:机械工业出版社,1982
8徐龙君.突出区煤的超细结构、电性质、吸附特征及其应用的研究[博士学位论文][D].重庆:重庆大学,1 996
9 Song Y,NohTN,LeeSK,e tal.E xp eri mentalstudy ofthedimension ala cconductiv ityanddi el e ctricconstantofacon ductor-in sula tor compositene arthepercilationthreshold[J].Phy.Rev.B.,1986,33(2):904??04
10Nikl assonGA,GranqvistC G.Infrared -o pticalproperti esof gas-evaporatedg old blacks:ev idencefora mo malousc onductiononfractalstructures[J].Phy.Rev.Lett.,1986,56:256～256
11徐龙君.煤吸附性质和电特性的分形特征[博士后研究工作报告][R].重庆:重庆大学,1999
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