摘要
介绍了水平定向钻在地下管线施工方面的应用状况;分析了不同埋深直线电流一次电磁场Hx、Hz的归一化异常的分布特征,以及确定地下金属管线的理论依据;提出了对深埋>3 m的地下管线探测时应采用的频率、电流、远端接地等提高信噪比的技术对策,及利用水平磁场分量70%法确定管线深度的适用条件;列举了3个长距离、深度>10 m过江深埋管线的探测实例,说明方法的有效性。
The development of the Horizon Directional Drilling and the technical specification of some pipeline instruments are described in this paper. The distribution features of abnormal points of Hx ,Hz about the primary electromagnetic field in different depths on the linear electric current are analyzed. The theory to ascertain the underground iron pipeline is proposed. Some probing technological measures in frequency electricity, current and long grounded pole to improve the accuracy of underground pipelines buried deeper than three meters are suggested here. The applicable condition for the determination of the depth of the rather deep underground pipelines using horizontal magnetic field intensity is proposed. Three examples of pipeline probing in Guangzhou are given in this paper, in which the pipelines cross very wide rivers and long distances and the depths are deeper than 10 m.
出处
《物探与化探》
CAS
CSCD
2006年第4期366-369,373,共5页
Geophysical and Geochemical Exploration
关键词
直线电流
电磁场
管线探测
深埋管线
剖面曲线
水平定向钻
linear electric current
electromagnetic field
pipeline detection
deep buried pipeline
section curve
Horizon Directional Drilling
