Burial Depth Effect of Mine Pressure Behavior at a Shallow Buried Fully Mechanized Caving Face Under Thin Bedrock

Applying the combined methods of analog simulation tests and field measurement, the article studies the influence of burial depth on mine pressure behavior at a shallow buried fully mechanized caving face under thin bedrock. According to the study, for fully mechanized caving mining with shallow burial depth and thin bedrock, changes in coal seams' burial depth (changes in loess layer thickness) have little influence on the overburden structure above the caving face under same coal seam thickness and same bedrock thickness. The overburden structures all form into structure of "combined cantilever beam + articulated rock beams+ arch". When the burial depth is larger, the periodic roof weighting paces at the caving face will be smaller, while the dynamic load coefficient and support resistance at the end of its movement cycle will be larger.