地电场作用下矿层中气体渗流特性的实验研究  

An Experimental Study on Seepage Properties of Gas in Ledge under the Effect of Geoelectric Field

作　　者：邓小燕[1] 王通[2] 罗维斌[3] 

机构地区：[1]西北民族大学电气工程学院,甘肃兰州730030 [2]中国水电西北勘测设计研究院物探所,甘肃兰州730050 [3]中南大学信息物理工程学院,湖南长沙410083

出　　处：《矿业研究与开发》2007年第6期33-36,共4页Mining Research and Development

摘　　要：针对地球物理场中地电场对原地浸出过程中气体渗流特性的影响,在实验室采用三轴渗流实验装置和电场实施装置,研究了外加电场作用下矿层中气体的渗流特性。实验结果表明:地电场对矿体中气体渗流特性的影响非常明显;加正向电场后,气体渗流速度比无电场时要大,反向电场作用下,气体渗流速度比无电场时要小,并且渗流速度随气体压力梯度增大成线性增加,矿层中气体渗流量随电场强度升高成线性增大;渗透性越好的矿层,地电场作用下气体的地电场电动效应越明显;地电场作用时,矿层的等效渗透系数可表达成ke=k(1+βE)。In the light of the fact that the geoelectric field in geophysical field is effective on seepage properties of gas in the process of in - situ leaching, a test was made on the seepage properties of gas in ledge under the effect of electric field by tri- axial seepage experiment equipment. The tested results indicated that： the influence of geoelectric field on the seepage properties of gas in ledge is obvious, the seepage velocity of gas under positive electric field is faster than that with no electric field, but the seepage velocity of gas under negative electric field is slower than that with no electric field, and the velocity of seepage increased linearly with the raise of pressure gradient of gas, the seepage quantity of gas in ledge increased approximately linearly with the enhancement of electric field strength. The better penetrability of ledge was and the more obvious electric effect on gas seepage was. The equivalent gas permeability ke in ledge can be expressed by ke = k（1 ＋βE） .

关 键 词：原地浸出 矿层 气体 渗流特性 地电场 

分 类 号：TD853.37[矿业工程—金属矿开采]