为研究岩石孔隙对电脉冲破岩的影响规律,以电脉冲作用下岩石电场强度为评价指标,推导了岩石孔隙电场强度数学模型,建立了电脉冲作用下岩石电场强度二维模拟方法,开展了电脉冲破岩影响规律的数值模拟及实验研究。结果表明:孔隙的存在会引起岩石电场畸变,孔隙与岩石基质交界处的电场强度最大,电脉冲击穿将首先发生在孔隙边缘处;岩石孔隙数量越多、间距越小,电场强度越大;孔径、孔隙形态及方位对岩石电场强度具有重要影响,孔隙与电场线的有效作用面越大,电场强度越大,岩石越容易发生击穿破坏。高孔隙度的砂岩比低孔隙度的大理岩更容易被电击穿,砂岩样本的击穿概率同样随孔隙度的增大而升高。研究成果明确了孔隙对电脉冲破岩的重要影响,对于认识电脉冲破岩机理具有重要意义。
In order to study on the law of the effect of rock pore properties on the electric pulse rock breaking,by taking the electric field intensity of rock under the action of electric pulse as the evaluation index,a mathematical model of the electric field intensity of rock pores was derived,a two-dimensional simulation method of the electric field intensity of rocks under the action of electric pulses was established,and a numerical simulation study and an experimental study of the law of the effect on electric pulse rock breaking were carried out.The results show that:the existence of pores will cause the electric field distortion of rocks,the electric field intensity at the junction of pores and rock matrix is the largest,and the electric pulse breakdown will occur first at the edge of the pores; the more the number of pores is,and the smaller the spacing is,the greater the electric field intensity is; the pore diameter,pore morphology and orientation have an important impact on the electric field intensity of rocks,and the larger the effective action surface between the pores and the electric field lines is,the greater the electric field intensity is,and the more likely the rock will be broken down.The high-porosity sandstone is more likely to be electrically broken down than the low-porosity marble,and the breakdown probability of sandstone samples also increases with the increase of porosity.The results of the study clarify the important effect of pores on electric pulse rock breaking,which is of great significance for understanding the mechanism of the electric pulse rock breaking.
[1] TIMOSHKIN I V,MACKERSISE J W,MACGREGOR S J.Plasma channel microhole drilling technology[C]//Digest of Technical Papers.14th IEEE International Pulsed Power Conference.Texas,IEEE,2003:15-18.
[2] 王鄂川,樊洪海,徐鹏,等.等离子通道钻井技术概况和发展前景[J].断块油气田,2013,20(2):221-224.
WANG Echuan,FAN Honghai,XU Peng.Overview and development prospects of plasma channel drilling technology[J].Fault-Block Oil & Gas Field,2013,20(2):221-224.
[3] 赵大军,房昕.高压脉冲放电钻进实验平台的研究[J].科技传播,2011,56(7):56-58.
ZHAO Dajun,FANG Xin.Research of drilling platform by high voltage pulse [J].Public Communication of Science & Technology,2011,56(7):56-58.
[4] KUSAIYNOV K,NUSSUPBEKOV B R,SHUYUSHBAYEVA N N,et al.On electric-pulse well drilling and breaking of solids[J].Technical Physics,2017,62(6):867-870.
[5] 李昌平,契霍特金,段隆臣.电脉冲破岩钻进技术研究进展 [J].地质科技情报,2018,37(6):298-304.
LI Changping,CHIKOTKIN V F,DUAN Longchen.Research progress of electro pulse boring rock breaking technology[J].Geological Science and Technology Information,2018,37(6):298-304.
[6] KURETS V I,LOPATIN V V,NOSKOV M D.Influence of local heterogeneities on discharge channel trajectory at electric pulse destruction of materials[J].Journal of Mining Science,2000,36(3):268-274.
[7] LISITSYN I V,INOUE H,NISHIZAWA I,et al.Breakdown and destruction of heterogeneous solid dielectrics by high voltage pulses[J].Journal of Applied Physics,1998,84(11):6262-6267.
[8] 章志成.高压脉冲放电破碎岩石及钻井装备研制[D].杭州:浙江大学,2013.
ZHANG Zhicheng.Rock fragmentation by pulsed high voltage discharge and drilling equipment development[D].Hangzhou:Zhejiang University,2013.
[9] 章志成,裴彦良,刘振,等.高压短脉冲作用下岩石击穿特性的实验研究 [J].高电压技术,2012,38(7):1719-1725.
ZHANG Zhicheng,PEI Yanliang,LIU Zhen,et al.Experimental research on rock breakdown under short high-voltage pulse[J].High Voltage Engineer,2012,38(7):1719-1725.
[10] KUSAIYNOV K,NUSSUPBEKOV B R,SHUYUSHBAYEVA N N,et al.On electric-pulse well drilling and breaking of solids[J].Technical Physics,2017,62 (6):867-870.
[11] BOEV S,VAJOV V,JGUN D,et al.Destruction of granite and concrete in water with pulse electric discharges[C]//Digest of Technical Papers.Proceedings of the 12th International Pulsed Power Conference.Piscataway NJ,IEEE,1999:27-30.
[12] BURKIN V,KUZNETSOVA N,LOPATIN V.Dynamics of electro burst in solids:II.characteristics of wave process[J].Journal of Physics D Applied Physics,2009,42(3):209-213.
[13] TIMOSHKIN I V,MACKERSIE J W,MACGREGOR S J.Plasma channel miniature hole drilling technology[J].IEEE Transactions on Plasma Science,2004,32(5):2055-2061.
[14] 李晶晶.基于MATLAB与COMSOL 的磁场仿真系统研究[D].长春:吉林大学,2015.
LI Jingjing.The research of magnetic field simulation system based on MATLAB and COMSOL[D].Changchun:Jilin University,2015.
[15] 闫发志.基于电破碎效应的脉冲致裂煤体增渗实验研究[D].徐州:中国矿业大学,2017.
YAN Fazhi.Experimental study on pulses induced fracturing and permeability enhancing of coal blocks based on the electrical fragmentation effect[D].Xuzhou:China University of Mining and Technology,2017.
[16] 李玮,孙文峰,唐鹏,等.基于拓扑结构的岩石裂缝网络表征方法 [J].天然气工业,2017,37(6):22-27.
LI Wei,SUN Wenfeng,TANG Peng,et al.A method for rock fracture network characterization based on topological structure [J].Natural Gas Industry,2017,37(6):22-27.
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