| Based on the geological and mining technical conditions of No. 8102 face in the Guobei Coal Mine, key technologies of reasonable mining under the condition of soft coal, thick-hard roof and contiguous seams have been studied by the integrated means of theory analysis,numerical simulation and field measurement.Firstly, mining methods suiting with soft coal, thick-hard roof have been comprehensively synthetically analyzed and evaluated after making mathematical model for economic profit analysis . Secondly, mechanical judgement criterion of layered movement of thick-hard roof has been deduced in terms of elasticity theory .Thirdly, structures and movements of overlying strata , distribution of abutment pressure and the structure of immediate roof in the working face with sotf coal and thick-hard roof have been studied by jointly employing theory analysis, UDEC numerical simulation and field measurement. Fourthly, start with the research on classification of partings ,mechanics model of partings has been established based on analysis of strength and deformation of top coal ,and influence of partings on top coal cavability has been analyzed. Finally, field measurements have validated the conclusions. The results of the reseach will offer instructive reference for choosing reasonable mining methods according to different geological conditions,improve coal resource recovery rate,increase economic profits.
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