A novel algorithm for the coverage homogeneity analysis of along-seam boreholes in the coal gas drainage project

摘要

In the coal gas drainage project, thousands of along-seam boreholes were often constructed due to their easy-construction, high-usage and low-cost. Their poor coverage homogeneity would reduce the quantity of coal gas drainage and might facilitate coal gas outburst accidents. Based on the vector algebra theory and computer technology, this study has proposed a novel algorithm for their coverage homogeneity analysis. Firstly, the spatial data structure of along-seam boreholes was built as entity-relation model. Secondly, the coal mass of one coal mining working face as a whole was divided into numerous unit bodies by mesh generation. The coverage rate of each unit body was calculated based on the intersection volume between the unit body and boreholes that traversed it. At last, all unit bodies were synthesized to achieve the coverage homogeneity of the given coal mass, which formed a logical workflow. By testing in Qinan colliery of China, the algorithm was proved to be objective, effective and helpful to improve the digitalization of coal gas drainage project.