Integrative solution of stress evolution in overburden roof strata during the coal seam mining by application of complex variable functions methodologyOA
Large-scale roof collapse is a major dynamic hazard threatening the safe coal mine operations.Understanding the deformation and failure characteristics of overburden rock strata,as well as deciphering the stress evolution mechanism of overburden rock structure in mining stopes,is of great theoretical advancement and engineering applications in roof disasters prevention.This study employs a theoretical derivation to systematically analyze the characteristics of overburden roof deformation and caving behavior during the coal seam mining.By modeling the trapezoidal caving zone in the overburden roof strata as a complex functional system,the stress distribution within the caving zone and adjacent intact strata was mathematically characterized.Stress evolution patterns of overburden strata at different caving stages were derived under both elastic and elastoplastic deformation conditions,accompanied by the demarcation of elastic-plastic zones.In addition,the critical length for the first caving and periodic caving of overburden are theoretically determined.To validate the proposed analytical framework,comprehensive numerical simulation and physical model tests are conducted to investigate the overburden roof caving characteristics during coal seam mining.Quantitative comparisons between experimental,numerical results and theoretical analyses were performed in terms of the caving range of roof strata,the critical length for the roof strata caving and stress distribution.The consistencies among different approaches confirms the reliability of the theoretical model,providing a robust foundation for optimizing mining designs and implementing effective roof control strategies.
Yinkai Li;Hongwei Wang;Zhanbin Zhu;Daixin Deng;Naisheng Jiang
School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing,100083,ChinaSchool of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing,100083,China Mataihao Coal Mine,Inner Mongolia Ordos Yongmei Mining Industry Co.,Ltd.,Ordos,017212,ChinaJoint National-Local Engineering Research Centre for Safe and Precise Coal Mining(Anhui University of Science and Technology),Huainan,232001,ChinaSchool of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing,100083,China School of Mechanical Engineering,Sichuan University of Science and Engineering,Zigong,643000,ChinaSchool of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100083,China
矿业与冶金
Overburden roof cavingComplex variable functionsMechanical modelStress evolutionNumerical simulation
《Rock Mechanics Bulletin》 2026 (2)
P.30-54,25
supported by the State Key Research Development Program of China(2024YFC3013804)the Independent Research fund of Joint National-Local Engineering Research Center for Safe and Precise Coal Mining(Anhui University of Science and Technology)(EC2022001)National Natural Science Foundation of China(41872205)Beijing Natural Science Foundation(8202041)State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining&Technology,Beijing(XDJJ2020001-006).
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