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Application of Tomography Technique in Detecting Coal

Mining Goaf

TANG, Zhao jian

(The school of resource and earth science, CUMT, Jiangsu, Xuzhou, 221008)

AbstractGoaf, one of potential geological disasters produced by human activities, seriously threats to the coal mine safety production, engineering construction and the lives and property of the people.To treat goaf, the key is to make clear the location, buried depth and present situation of mined-out area.Only we fully understand the spatial distribution of old coal mining area, governance has a definite object.Conventional seismic refection method detecting goaf is based on continuous, homogeneous and smooth reflection interface.The size and the scope of goaf can't be directly described in mined-out area that the reflection interface is damaged affected by mining activities.Applied seismic data to inverse the material property of underground structure, tomography technology has significant advantages in determining internal fine structure and local inhomogeneity of formation.The application of tomography technology is mainly studied in detecting coal mining goaf in this paper.We respectively build goaf tomography by surface-to-surface first break time and hole-to-surface first break time through the numerical simulation method which is based shortest path algorithm and Simultaneous Iterative Reconstruction Technique(SIRT).First, the horizontal resolution was analyzed by comparisons of single goaf models with different scale and double goafs model with diverse space beneath the smooth surface.And then the borehole-to-surface deep goaf model with complex surface condition was built to discu effects of tomography imaging.Finally, the paper analyzed several factors which affect results of tomography.It can be concluded that by model data analyzing: surface-to-surface tomography has approving result in shallow goaf detection with little surface relief and hole-to-surface tomography could have satisfied results in deep goaf with complex surface condition.Applied practical seismic data from Shanxi and Xuzhou, we has separately carried on proceing of surface-surface tomography and borehole-surface tomography detecting goaf which obtained a good effect and proved the conclusion.Keywords: tomography;coal mining goaf;velocity inversion