地电场对裂隙岩块中对流传热特性影响的研究
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摘要
根据原地浸出过程中裂隙岩块中对流传热过程受地电场作用的特点,建立地电场作用下裂隙岩块中的对流传热模型,并通过电场作用下岩芯中的对流传热实验,研究地电场作用对裂隙岩块中溶液对流传热特性的影响。结果表明:地电场作用对裂隙岩块中对流传热的影响非常明显,其影响程度同热流密度、流体渗流速度以及流体性质等因素相关;对流换热系数总体上随正向电场电压升高而增强,随反向电场电压升高而降低;地电场作用下,低热流密度时对流换热系数的变化幅度明显高于高热流密度下换热系数幅度的变化;地电场作用对裂隙岩块中对流传热的影响随着溶液渗流速度的增加逐渐减弱;裂隙岩块中溶液矿化度越高,地电场对对流传热的影响越明显。
According to the properties that the convection heat transfer in fractured rock block is affected by geoelectric field in the process of in-situ leaching,the model of convection heat transfer under geoelectric field has been brought out;and the influences have been investigated through the experiments. The following results can be drawn. (1) The geoelectric field affects the properties of convection heat transfer obviously;and the influential degree is related with the heat flux,the seepage velocity of liquid,the characters of liquid and so on. (2) The convection heat transfer coefficient increases with the increase of forward electric field voltage,and decreases with the increase of the reversed one. (3) Under the action of geoelectric field,the variation amplitude of convection heat transfer coefficient with low heat flux is evidently higher than that with high heat flux. (4) The effect of the geoelectric field on the convection heat transfer in fractured rock block is weakened gradually with the increase of the seepage velocity of liquid. (5) The higher the mineralization of solution in fractured rock block is,the greater the influence of geoelectric field on the convection heat transfer is.
According to the properties that the convection heat transfer in fractured rock block is affected by geoelectric field in the process of in-situ leaching,the model of convection heat transfer under geoelectric field has been brought out;and the influences have been investigated through the experiments. The following results can be drawn. (1) The geoelectric field affects the properties of convection heat transfer obviously;and the influential degree is related with the heat flux,the seepage velocity of liquid,the characters of liquid and so on. (2) The convection heat transfer coefficient increases with the increase of forward electric field voltage,and decreases with the increase of the reversed one. (3) Under the action of geoelectric field,the variation amplitude of convection heat transfer coefficient with low heat flux is evidently higher than that with high heat flux. (4) The effect of the geoelectric field on the convection heat transfer in fractured rock block is weakened gradually with the increase of the seepage velocity of liquid. (5) The higher the mineralization of solution in fractured rock block is,the greater the influence of geoelectric field on the convection heat transfer is.
引文
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[15]张云琳.大地电场临震突变异常形态的初步研究[J].西北地震学报,1980,2(4):5054.(ZHANG Yunlin.A preliminary study on the features of abrupt anomalous change of the electrotelluric field[J].Northwestern Seismological Journal,1980,2(4):5054.(in Chinese))
[16]毛桐恩,席继楼,王燕琼,等.地震过程中的大地电场变化特征[J].地球物理学报,1999,42(4):520528.(MAO Tong′en,XI Jilou,WANG Yanqiong,et al.The variation characteristics of the telluric field in the process of earthquake[J].Chinese Journal of Geophysics,1999,42(4):520528.(in Chinese))
[17]PANOFSKY W,PHILIPS M.Classical electricity and magnetism[M].2nd ed.London:Addison-Wesley,1962:107.
[2]万志军,赵阳升,康建荣.高温岩体地热资源模拟与预测方法[J].岩石力学与工程学报,2005,24(6):945949.(WAN Zhijun,ZHAO Yangsheng,KANG Jianrong.Simulation and forecast method of geothermal resources in hot dry rock[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(6):945949.(in Chinese))
[3]赵坚.岩石裂隙中的水流岩石热传导[J].岩石力学与工程学报,1999,18(2):119123.(ZHAO Jian.Experimental study on flow-rock heat transfer in rock fractures[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(2):119123.(in Chinese))
[4]吴亚平,郭春香,潘卫东,等.冻土区桩基回冻过程对单桩承载力和桥梁施工的影响分析[J].岩石力学与工程学报,2004,23(24):42294233.(WU Yaping,GUO Chunxiang,PAN Weidong,et al.Influences of refreezing process of ground on bearing capacity of single pile and bridge construction in permafrost[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(24):42294233.(in Chinese))
[5]吴青柏,董献付,蒋观利.开放和封闭条件下块石结构路基下部土体降温效果差异[J].岩石力学与工程学报,2006,25(12):25652571.(WU Qingbai,DONG Xianfu,JIANG Guanli.Cooling effect differences of soil beneath open and closed block-stone embankments[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(12):25652571.(in Chinese))
[6]张明义,赖远明,喻文兵,等.封闭与开放抛石路堤降温效果及机制对比试验研究[J].岩石力学与工程学报,2005,24(15):26712677.(ZHANG Mingyi,LAI Yuanming,YU Wenbing,et al.Contrast experimental study on cooling effect and mechanism between closed and open riprapped-embankments[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(15):26712677.(in Chinese))
[7]左恒,吴爱祥,王贻明,等.地电场对裂隙岩块中溶浸液渗流特性影响的研究[J].岩石力学与工程学报,2007,26(5):972976.(ZUO Heng,WU Aixiang,WANG Yiming,et al.Study on effect of geoelectric field on seepage properties of leaching solution in fractured rock block[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(5):972976.(in Chinese))
[8]王洪江,吴爱祥,刘金枝,等.排土场浸出过程中的渗流规律[J].中南大学学报(自然科学版),2006,37(2):390395.(WANG Hongjiang,WU Aixiang,LIU Jinzhi,et al.Seepage rule during leaching in dump[J].Journal of Central South University(Science and Technology),2006,37(2):390395.(in Chinese))
[9]殷黎明,杨春和,王贵宾,等.地应力对裂隙岩体渗流特性影响的研究[J].岩石力学与工程学报,2005,24(17):30713075.(YIN Liming,YANG Chunhe,WANG Guibin,et al.Study on effect of geostress on permeability of fractured rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(17):30713075.(in Chinese))
[10]KELAYEFU A T T.Questions of physical geography[M].[S.l.]:[s.n.],1963.
[11]康健,赵明鹏,赵阳升,等.随机介质固热耦合模型与高温岩体地热开发人工储留层二次破裂数值模拟[J].岩石力学与工程学报,2005,24(6):969974.(KANG Jian,ZHAO Mingpeng,ZHAO Yangsheng,et al.Random non-homogeneous solid-heat coupled model and numerical simulations of second fracturing for man-made-reserve stratum in HDR[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(6):969974.(in Chinese))
[12]陈波,李宁,禚瑞花.多孔介质的变形场渗流场温度场耦合有限元分析[J].岩石力学与工程学报,2001,20(4):467472.(CHEN Bo,LI Ning,ZHUO Ruihua.Finite element analysis of fully coupled thermo-hydro-mechanic behavior of porous media[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(4):467472.(in Chinese))
[13]GOVETT G J S.Soil conductive assessment of an electric-chemical technique[M].[S.l.]:[s.n.],1974:176188.
[14]孙正江,王华俊.地电概论[M].北京:地震出版社,1984:318.(SUN Zhengjiang,WANG Huajun.Geoelectric conspectus[M].Beijing:Earthquake Press,1984:318.(in Chinese))
[15]张云琳.大地电场临震突变异常形态的初步研究[J].西北地震学报,1980,2(4):5054.(ZHANG Yunlin.A preliminary study on the features of abrupt anomalous change of the electrotelluric field[J].Northwestern Seismological Journal,1980,2(4):5054.(in Chinese))
[16]毛桐恩,席继楼,王燕琼,等.地震过程中的大地电场变化特征[J].地球物理学报,1999,42(4):520528.(MAO Tong′en,XI Jilou,WANG Yanqiong,et al.The variation characteristics of the telluric field in the process of earthquake[J].Chinese Journal of Geophysics,1999,42(4):520528.(in Chinese))
[17]PANOFSKY W,PHILIPS M.Classical electricity and magnetism[M].2nd ed.London:Addison-Wesley,1962:107.
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