ABSTRACT
KEYWORDS: Goaf, three-dimensional space, spontaneous combustion, numerical simulation
1. INTRODUCTION
By using the fully-mechanized mining top-coal caving technique, mining intensity increased continuously and coal spontaneous combustion risk increased significantly (Xian et al. 2001). At present, the research on regularity of spontaneous combustion of coal at home and abroad mainly concentrated on flow field simulation of goaf rear and the demarcation of goaf 2-d “three zones”. Research on regularity of spontaneous combustion of coal goaf 3d space is relatively weak (Cui 2001). In the process of conduct coal goaf spontaneous combustion accident, most of the high temperature burning point area or high temperature zone must be located in certain height space apart from floor. This phenomenon cannot be reasonably explained by “2-d”. To make certain of the development and changes of coal goaf spontaneous combustion and the boundary of spontaneous combustion dangerous areas, it must be studied from the “3-d” space to provide theoretical basis for full-mechanized top-coal caving mining goaf spontaneous combustion control (Li et al. 2004).
