层析技术测定煤层覆岩破坏高度的应用

APPLICATION OF TOMOGRAPHY TECHNIQUE TO DETERMINE THE BROKEN HEIGHT OF OVERLYING ROCK OF COAL LAYER

本文介绍了邵武煤矿在观测钻孔中应用电磁波层析技术（即CT）探测覆岩破坏高度的研究。电磁波层析技术利用覆岩的吸收系数、介电常数和电导率等电磁参数在开采前后的数值变化，并结合岩性和地质采矿条件等进行综合解释，从而较准确地重现覆岩的地层结构和煤层开采后覆岩的破坏变化，为判定覆岩破坏高度提供更为直观、可靠的依据。

This paper introduces the experimental study of detecting the broken height of overlying rock by using the electromagnetic wave tomography technique(CT). The electromagnetic wave tomography technique makes use of the variation of the absorptivity,dielectric constant and conductivity etc of overlying rock before and after exploitation, combining with the lithology and geologic-mining conditions to conduct synthetic interpretation, so as to reappear rather accurately the stratigraphic structure and the broken variation of the overlying rock after the coal exploitation and to supply a more audio-visual and reliable grounds for discerning the broken height of overlying rock.