Affiliation:
1. School of Mines, China University of Mining and Technology, Xuzhou 221116, China
2. State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, China
Abstract
Shallow-buried, hard, and extra-thick coal seams are very common in Xinjiang, China, but there are relatively few studies on the mine pressure law and the development characteristics of water-flowing fracture zones (WFFZs) during the mining of such coal seams. In this paper, the mine pressure of the top coal caving face in a shallow, hard coal seam with a hard roof and full bedrock (SHCSHRFB) is analysed, the laws of the surrounding rock deformation and stress of the open-off cut and roadway in the large-mining-height top coal caving face are studied, the characteristics of roof-breaking and overburden fracture development are analysed using the physical similarity simulation method, supporting suggestions for roadways are put forward, and three development stages of the WFFZ are analysed. Field monitoring shows that the hydraulic support stress in SHCSHRFB is weak, but the coal wall and roadway stability are good, which is significantly different from the results in the typical shallow-buried thin bedrock working faces. The measured height of the WFFZ is close to the physical similarity simulation results, but quite different from those arising from use of the empirical formula.
Funder
Postgraduate Research and Practice Innovation Program of Jiangsu Province
“Scientists + Engineers” Team for Water Conservation Mining of Extra-Thick Coal Seam
Reference29 articles.
1. Water abundance evaluation of a burnt rock aquifer using the AHP and entropy weight method: A case study in the Yongxin coal mine, China;Xue;Environ. Earth Sci.,2021
2. Qin, D.D., Wang, X.F., Zhang, D.S., Guan, W.M., Zhang, L., and Xu, M.T. (2019). Occurrence Characteristic and Mining Technology of Ultra-thick Coal Seam in Xinjiang, China. Sustainability, 11.
3. The Influences of Key Strata Compound Breakage on the Overlying Strata Movement and Strata Pressure Behavior in Fully Mechanized Caving Mining of Shallow and Extremely Thick Seams: A Case Study;Li;Adv. Civ. Eng.,2019
4. Huang, Q.X., and He, Y.P. (2019). Research on Overburden Movement Characteristics of Large Mining Height Working Face in Shallow Buried Thin Bedrock. Energies, 12.
5. Mechanical Performances of Pressure Arch in Thick Bedrock during Shallow Coal Mining;Wang;Geofluids,2018