摘要
为获得半空间瞬变电磁大定源回线探测的理想效果,通过数值模拟优化,在等周长情况下,确定不同长宽比K发射回线内的最佳观测区域。由测点距框边最小距离建立回归方程,研究其变化规律,确定合理的K值范围。回归方程求解表明,当K∈[0.60,1.45]时,可保证等周长发射回线内有较大探测区域。其中,当K=1.00时,发射回线探测区域最大。现场工程实践显示所得视电阻率剖面图中的电阻率变化趋势与地层电性特征吻合,与现场地质资料、工程技术图件和钻孔柱状图比较,表明实践所得成果与现场工程实际具有一致性。优化的半空间瞬变电磁大定源回线探测发射回线设计,可降低现场布线难度,提高探测效率。
This paper is an attempt to obtain the ideal effect of large fixed source loop detection of transient electromagnetic in half space.The study involves optimizing the numerical simulation,under equal perimeterconditions,determining the optimal observation area in transmission loop with different aspect ratio K;building regression equation with the minimum distance between the measuring point and the edge of the frame,studying its changes rule and determinga reasonable range of K value.The solution of the regression equation shows thata large detection area exists in the transmitting loop of equal perimete,as K∈[0.60,1.45],among which the detection area of transmitting loop is the largest,as K=1.00.Based on this conclusion used in field engineering practice,the resistivity variation trend in the apparent resistivity profile is consistent with theelectrical characteristics of the stratum,compared with the field geological data,engineering drawings and borehole histogram,the practical result shave the consistency with that in the field engineering practice.The study could optimize the design of semi-space transient electromagnetic large fixed source loop detectionand transmission loop,reduce the difficulty of field wiring and improve the detection efficiency.
作者
康健
张添新
林井祥
张继忠
Kang Jian;Zhang Tianxin;Lin Jingxiang;Zhang Jizhong(Science & Technology Office, Heilongjiang University of Science & Technology, Harbin 150022, China;School of Mining Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China)
出处
《黑龙江科技大学学报》
2022年第3期321-326,共6页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省省属高校基本科研业务费项目(2018-KYYWF-1177)。
关键词
半空间瞬变电磁
大定源回线探测
发射回线
框边影响
half-space transient electromagnetic
large fixed source loop detection
launch loop
box side effects
