外文翻译-矿井瞬变电磁法在老窑水超前探测中的应用.doc

1、翻译部分英文原文Application of Mine Transient Electromagnetic Method in Forecasting Goaf WaterJiang Zhihai, Yue Jianhua, Liu Zhixin(School o f Resource and earth science, CUMT, Jiang su XuZhou 221008, China) Abstract: In this paper, the principle of mine transient electromagnetic method ( MTEM) is introduce

2、d. The method w as used to forecast the goaf water in the course of the No . 2 main return airway driven in a coal mine. The results show that the position of the g oaf water can be found out accurately and rapidly by MTEM, the operation is convenient and it can be applied to make the real- time pre

3、dict continuously, the qualitative analysis o f the water can be made, but the quantitative analysis cannot be, because the abnormal area is larger than the real region filled with the water in the map of the apparent resistivity isoline. Furthermore, the data of the side w all of the drift is influ

4、enced easily by the bolting with wire mesh and the blind zone in short distance cannot be avoided.Key words: mine transient electromagnetic method; goaf water; prediction; driving head;small multi-turn loop1. IntroductionOld kiln in shallow water general buried, mining the lower, long coal seam, the

5、 situation of the coal seam mining difficult integrated water, water accumulated range is not clear. Although the water is not big, generally does not cause flooding the well disaster; But water concentration, bringing rapid, once revealed, will be to pressure pipeline flow! In the form of a sudden

6、collapse, fast, have a lot of impact and damaging to the personal safety of great harm. The basic countermeasures of prevention and treatment is to keep a suspect agent shall, after the principle of digging out first. Because the water space are usually very concealment, shape is irregular, depth an

7、d horizon is differ, sizes, the ground of the electric prospecting it is difficult to reach the ideal detection effect. Many small circle back to wire device form of mine transient electromagnetic method is developed in recent years to a new underground physical detection technology, with constructi

8、on in a fast, convenient and volume effect is small, high resolution, detection range of water cut, low resistance body reflect sensitive etc, and in front of the fault of excavating, collapse column, hydrology drilling of tectonic with advanced detection of the water has obtained good application e

9、ffect. Therefore, the author in a coal mine in Shanxi has numerous old kiln water advanced prediction by mine transient electromagnetic method, the mine to no. 2 total return air head lane ahead of a certain range old kiln water area a probe, detection results and drilling verify the results, has ob

10、tained the good application effect.2. Basic principleMine transient electromagnetic method of advanced detection principle and the ground transient electromagnetic sounding principle is consistent, detection set up when the normal direction at the coil in the roadway to detect target body, in order

11、to launch coil zhongtong jump a current, a moment so close, according to the American earth physicists m. n. Nabighan第 140 页research, launch any time in front of the vortex current coil in launch position place magnetic fields produced could be the equivalent of a horizontal ring line current of mag

12、netic field, equivalent electric current ring is very like sending back from the line of a series of hole blown out, namely hole effect (figure 1). From the hole effect! Point of view, the transient electric magnetic field by early is close to the launch of the medium of the coil head-on ahead of th

13、e current to produce induction, reflect the close electrical distribution; The transient electric magnetic field late mainly by far away from the launch of the medium of the coil head-on ahead of induction current to produce, reflect the electrical distribution over long distances. Accordingly, acco

14、rding to receive the tem field variation law with time, can detectJueJinTou ahead of rock electrical changes to achieve the purpose of advanced detection.roadwayEquivalent electric current ringFig.1 Transient electromagnetic advanced detection principle diagram3.Methods technologyThe limit of the sp

15、ace by the roadway, mine transient electromagnetic method usually adopts the side 2 3 ms small back to wire device form, by increasing the coil circle number methods to increase the magnetic strength and effective reception area launch, and increase the SNR, to meet the detecting depth requirements.

16、 Coil of normal direction detection can be regarded as the direction, because used small back to wire device form, its detection more directional. In underground construction process, according to the detection task requirement, can adjust coils and floor of the Angle between the point of the coil normals changed, to get ahead of JueJinTou different level on the horizon to the information. When the coil to look up Ang