| According to different geological tasks mine transient electromagnetic method will be divided into the roof and floor detection, tunnel advanced detection. Within the pyramidal in excavation roadway head-on probe floor in front of 50 m, roof within 50 meters and at both sides of the front of 50 meters to delineate whether there is water rich geological structure, adopts a fan-shaped advanced detection technology to detect. The position and range of the water body in the rock strata in the top 80 range of the working face plate. The relative strength of the water rich is the roof of the working face.. Similar to the detection of the bottom plate and side of the working surface. The position and range of the water body can be determined by the full space exploration if the water body is developed in the roof or the direction of the bottom plate.. However for a geological tasks, the multi direction detection technology, detection data in the detection range is three dimensional distribution. At present, the use of visual resistivity contour two-dimensional plane figure and results show, can not fully reflect the detection range electric parameters of spatial variation. In this paper, the problem of the mine transient electromagnetic space data body interpolation technology is studied, and the display of 3D spatial data body is realized..In theory, the transient electromagnetic sounding is that not to pick on loop or grounding wire back to the source to target regions that send a pulse field, in order to encourage the formation of medium sense of the secondary field, in a pulsed field intermittent period by the same loop or electric dipole receive secondary induction field, using the second contained within the field of geological information to analyze the distribution of regional geological detection. According to this principle, the design of the laneway frontal advance searching the side and roof of working face detection, working face floor detection and space probe four kinds of detection methods. The display mode and tunnel advanced detection and display the existing working face roof and floor.According to the spatial data interpolation direction, mainly to study the four kinds of interpolation methods, respectively, for the nearest neighbor interpolation, linear interpolation, cubic spline interpolation, Kriging interpolation. According to the difference dimension, three interpolation methods belong to the two-dimensional interpolation, Kriging interpolation is interpolation to three-dimensional coordinates of the grid points which, linear interpolation and cubic spline interpolation can also be summarized as polynomial interpolation. The nearest neighbor interpolation as a most simple interpolation accuracy is not high, but has the advantage of fast calculation and linear interpolation is in between two points in a straight line can roughly reflect the detecting area of the apparent resistivity distribution trend, and the algorithm is simple and operational speed is very fast. Cubic spline interpolation is a high order polynomial interpolation, the interpolation may make numerical interpolation points have a great deviation, the Kriging interpolation polynomial interpolation is a spatial interpolation method, in theory have more good interpolation effect.Finally, three-dimensional display program written in the program is mainly built up of three modules, transient electromagnetic head roadway ahead of the detection module, transient electromagnetic Face detection module, the apparent resistivity depth profile analysis module. Each module also contains the following different functions, similar transient electromagnetic roadway head of advanced detection module and transient electromagnetic Face detection module function, the display is divided into slices and interpolation functions. Apparent resistivity depth profile analysis module is designed comparative analysis of the effect of the interpolation method. Finally, the experimental validation of the following conclusions: order polynomial interpolation, cubic spline interpolation for example higher order interpolation error may cause the interpolation data is too large, have a negative data such distortion interpolation data obtained NA TEM data interpolation; linear interpolation is simple but needs to meet the transient electromagnetic data interpolation can effectively control the abnormal area, and without distortion, is a better kind of Kriging interpolation method, in theory, have a greater advantage. |
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