Study on mine pressure law and support resistance of working face under shallow buried gully terrain

Abstract

Abstract Because of the control problems caused by the non-uniform load of the roof of the working face when the shallow coal seam is mined under the condition of gully terrain. In this study, theoretical analysis, similar simulation, and field measurement methods are comprehensively used to incorporate gully topographic factors into the study of roof structure control, and a mechanical model of roof structure under non-uniform load is constructed. The interaction relationship between “powered roof support-rock mass” during the period of periodic pressure is analyzed, the corresponding model is established, and then the calculation equation of support resistance for controlling the sliding instability of the roof structure passing through the gully is derived. Taking the first mining face of Shaliang Coal Mine as the engineering background, reasonable support resistance is given based on the above research results. Through similar simulation experiments, the average weighting steps in the mining stage of downhill, gully bottom, uphill, and convex landforms are 19 m, 30 m, 14 m, and 15 m, respectively. The periodic weighting step in the gully bottom stage is the largest and the uphill mining stage is the shortest. Verified by field measured data, the derived equation is accurate and reliable. The research results enrich the roof control theory of shallow coal seam mining, provide key technical support and practical guidance for coal mining under similar geological conditions, and help to ensure coal mine safety production.

Keywords

• Shallow buried valley
• Mine pressure law
• Support resistance
• Non-uniform load
• Similar simulation