Affiliation:
1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and Technology Huainan Anhui China
Abstract
AbstractThe Yangjiacun coal mine, located in western China, exhibits distinctive characteristics, such as its shallow depth, thick bedrock, thin loose layer, and unique roof strata breaking movement. In this research, a comprehensive analysis of previous exploration data, subsequent mechanical testing, key stratum theory, natural equilibrium arch theory, and simulation tests and numerical simulations has been conducted to investigate the failure behavior of the overlying rock strata in the Yangjiacun Coal Mine. Specifically, the load‐bearing capacity of the key stratum structure in the bedrock and the morphological properties of the arch‐beam structure have been thoroughly examined. A mechanical model of the roof rock arch‐beam structure has been established, and an analytical formula for the limit size and stability criterion of the arch‐beam structure has been derived. The mining‐induced rock arch‐beam structure plays a crucial role in transferring the load of the upper strata to the surrounding goaf, thereby preventing subsidence and deformation of the overlying strata. However, the arch‐beam structure periodically experiences instability during the advancement of the working face, gradually progressing towards the upper layer until the main key stratum is breached and the arch‐beam structure collapses. Based on the characteristics of weathered rock and the arch‐beam failure model in the Yangjiacun Coal Mine, quantitative backfilling mining methods have been proposed to either compensate for the mining void created by coal extraction or limit the size of exposed key strata through strip mining, ensuring the stability of the R6 key stratum. This study represents a significant contribution to understanding the intricate failure behavior of overlying rock strata in coal mines and provides a valuable framework for the responsible and efficient extraction of coal resources in similar environments.
Subject
General Energy,Safety, Risk, Reliability and Quality
Reference25 articles.
1. Three‐field evolution law of shallow‐buried and short‐distance coal seam mining and the control effect of coal pillar group structure;HUANG QX;Chin J Coal,2021
2. Coupling control on pillar stress concentration and surface cracks in shallow multi-seam mining
3. Analysis of factors affecting surface skewed subsidence based on key layer theory;Yu QG;Chin J Coal,2018
4. “Key layer‐loose layer arch” theory of mining overburden structure and its application research;Wang F;Chin Univ Min Technol,2016
5. Mechanical characteristics and engineering practice of stress shell of roadway surrounding rock;Xie GX;Chin J Coal,2016
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