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中南大学学报(自然科学版)

Journal of Central South University

第32卷    第5期    总第141期    2001年10月

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文章编号:1005-9792(2001)05-0448-05
地下三维体上电测深曲线规律
肖志强,鲍光淑,敬荣中

(中南大学资源环境与建筑工程学院,湖南长沙 410083)

摘 要: 以均匀半空间中等轴状三维地质体为例,利用边界积分方程法对对称四极和温纳尔2种装置的电测深进行数值计算,并与相应解析表达式的计算结果进行对比;用数值模拟方法研究了均匀半空间中板状体的对称四极、温纳尔等装置电测深拟断面图“看得见但看不穿”的规律.研究结果表明:温纳尔、偶极等测深装置不仅能“看到”而且能“看穿”地下三维体,而对称四极装置及交流电法中采用平面波场的CSAMT,AMT等观测方式通常只能“看到”但不能“看穿”三维异常体;在对称四极测深装置中心剖面上,根据水平板状体的规模及埋深等因素,可分别将其视为一维层状体或均匀半空间处理,这对野外实际工作具有指导意义.

 

关键字: 边界积分方程法;温纳尔测深;对称四极测深;数值模拟

Rules of resistivity sounding curves for underground 3-D bodies
XIAO Zhi-qiang,BAO Guang-shu,JING Rong-zhong

College of Resources, Environment and Civil Engineering, Central South University, Changsha 410083, China

Abstract:Using boundary integral equation method, the authors calculate the results of symmetric four-pole sounding and Wenner array sounding for an equiaxial 3-D body in homogeneous half-space, and proves that the results are correct by comparing the results with calculating results of relevant analytic equation. Based on it, the authors, using the pseudosection map of symmetric four-pole sounding and Wenner array sounding in homogeneous half space, further study some rules of “ can see the 3-D body but cannot penetrate it”and conclude that Wenner array sounding, double-pole sounding and others can not only see the 3-D body but also penetrate it, but symmetric four-pole sounding and CSAMT,AMT, and other observation manners, which use plane wave,among alternating current methods can only see the 3-D body but cannot penetrate it. Level flat underground can be treated as 1-D stratumbody or homogeneous half-space when we observe on center profile using symmetric four-pole sounding accordingto the magnitude, burying depth of level flatetal. The above rules are important for our field work.

 

Key words: boundary integral equationmethod; Wenner array sounding; symmetric four-pole sounding; numerical modeling

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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