文献类型：期刊文献

英文题名：Study on the Fracture-Orientation Effect of Hard Roof Breakage Characteristics in Karst Mine Mining

作者：Zhang, Yuan Xu, Mengtang Kong, Dezhong Wu, Guiyi Song, Gaofeng

第一作者：Zhang, Yuan

通信作者：Kong, DZ[1];Wu, GY[1]

机构：[1]Guizhou Univ, Coll Min, Guiyang, Peoples R China;[2]Guizhou Inst Technol, Inst Ming Engn, Guiyang 550003, Peoples R China;[3]North China Univ Technol, Sch Civil Engn, Beijing, Peoples R China

第一机构：Guizhou Univ, Coll Min, Guiyang, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Min, Guiyang, Peoples R China.

年份：2025

外文期刊名：INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS

收录：;EI(收录号：20254619492237);Scopus(收录号：2-s2.0-105021237106);WOS:【SCI-EXPANDED(收录号:WOS:001609351700001)】；

基金：We acknowledge the financial support from the National Natural Science Foundation of China (No. 52564015, No. 52164002, No. 52164005, No. 52564007); Guizhou Science and Technology Support Programme, Qiankehe Support [2021] General 351; Guizhou Provincial Basic Research Program (Natural Science) (Qianke He Foundation-ZK [2024] Key 022); the paper was supported by Guizhou Science and Technology Plan Project (Qianke Science Support [2023] General 122); and the Yuxiu Innovation Project of NCUT (Project No. 2024NCUTYXCX209); Guizhou Provincial Science and Technology Department Innovation Talent Team Construction Project (Qiankehe talent CXTD [2025]025).

语种：英文

外文关键词：fissure orientated mechanisms; karst area; key layer; mining engineering; rupture characteristic

摘要：Southwest China commonly faces the complex challenge of coal seam mining within densely karstified regions. Taking Guizhou's Yudai Coal Mine as the study context, this paper employs theoretical analysis, numerical simulation, and physical experiments to investigate the failure mechanisms of karst cavities post-mining, the migration mechanisms of overlying rock fractures, and stress distribution patterns within karst environments. Through analysis, the critical stress conditions for cave collapse were determined. By configuring caves of varying shapes and hard rock layers of different thicknesses, it was found that circular caves exhibited the highest stability, followed by irregular caves, with square caves demonstrating the poorest stability. The thinner the hard rock layer, the greater the disturbance to the karst cavities and overlying rock, resulting in increased subsidence of the overlying rock. The fissures generated by the instability of karst cavities within fracture zones exert a certain guiding and attracting effect on mining-induced fractures, while also exerting a certain hindering effect on mining impacts. Following the fracturing of the overlying strata, the periodic pressure step distance exhibits a marked increase upon reaching the karst cavities, causing post-mining displacement and strain of the overburden to concentrate at the karst cavities and the left-hand goaf. Therefore, mining operations conducted beneath hard roof strata in karst mining areas can implement reinforced support measures for the hard roof overlying karst cavities. This prevents stress concentration caused by cavern collapse. The findings of this research may provide valuable reference for the safe extraction of coal seams in karst environments.