Mining Pressure Law and Working Resistance of Support in Face with Large Mining Height in Shallow Seam

• Published in: Mei kuang an quan Vol. 51; no. 11; pp. 243 - 247
• Main Author: QIU Fengqi, ZHU Lei, GU Wenzhe, LIU Zhicheng, ZHANG Xinfu, PAN Hao, SONG Tianqi
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Safety in Coal Mines 01.11.2020
• Subjects: fully mechanized coal face; large mining height; mine pressure law; shallow seam; working resistance of support
• ISSN: 1003-496X
• DOI: 10.13347/j.cnki.mkaq.2020.11.050

In order to study the law of ground pressure appearance in the face with large mining height in shallow coal seam and determine its reasonable working resistance of support, the 5-2 coal 503 working face of Daliuta Coal Mine in Shendong is selected as the research object. The law of ground pressure appearance in the face with large mining height in shallow coal seam is studied through the thin plate theory and the field measured ground pressure data, and the support resistance is calculated by combining two different theoretical calculation formulas force analysis. The results show that the initial step distance of 52503 working face is 64.4 m, which is basically consistent with 61.7 m calculated based on thin plate theory; the periodic weighting step fluctuates between 7.65 m and 29.75 m during the normal mining period, with an average of 19.16 m, a dynamic load coefficient of 1.45-1.57, an average of 1.50, which shows a strong mine pressure; during the weighting period, the support resistance along the incl