The Effect to the Extraction Ratio by the Fully Mechanized Sub-level Caving Mining Support's Canopy Length, the Gob Shield Angle and the Gob Shield Surface Coefficient

摘要

This article uses the alterable gob shield and alterable gob face parameter model support based on ZFSB_a-4400A-18. 2/28 support used in Yima Coal Mine Limeted Company to extract coal (2 ―3) bed. On the basis of data from analog simulation experiment, the article uses data analysis method to prove the length of support bar, the angle of gob shield all has effects on extraction ration. Also, this article uses the method of carve programming to get the quantitative relation between the length of support bar and extraction ratio, between the angle of gob shield and extraction ration, between the face friction parameter of gob shield and extraction ration. On the other side, linking the survey in reality, this article analyses the mechanism of the above three factors' effects on extraction ration, and draws a conclusion that is suitable for the condition.