Spatiotemporal evolution of mechanical characteristics in mining-induced overlying strata with gob-side entry retaining by roof cutting
SHUANG Haiqing
HAN Tao
ZHOU Bin
LI Shugang
LIN Haifei
CHENG Liang
CUI Mingwei
ZHANG Peizhen
Abstract：Based on the significant differences in roof structure fracture characteristics between gob-side entry retaining by roof cutting and coal-pillar mining,the mechanical response mechanism of the overburden under gob-side entry retaining by roof cutting was investigated.A physical similar-ity model of a coal mining panel in Shaanxi was constructed to track the dynamic development of fractures in different zones.The results show that the stress in the non-cutting coal pillar increases linearly,while the stress in the cutting-side coal pillar rises slowly in the early stage of mining and then accelerates.Although the roof cutting technique interrupts the short cantilever load path,the overburden load continues to be transferred to the deeper strata through a composite coal-pre-frac-tured plane structure.After the formation of a self-supporting masonry beam in the non-cutting roof,the vertical displacement and strain in the lower strata stabilize,while the horizontal displace-ment follows a"rapid-slow-rapid"sequence.The results also show that,at the end of mining,the maximum strain on the cutting side is 28.4％lower than that on the non-cutting side.The verti-cal displacement and strain in the upper strata are controlled by the key stratum,while the horizon-tal displacement is not affected.The cutting side develops 12.1％fewer fractures,which are mainly oriented within the range of 0°—65°.Field microseismic data further validate the failure mode of"compacted bulking gangue+residual roof micro-fracturing"on the cutting side.These results provide an important reference for clarifying the evolution of roof structure and fracture propagation under gob-side entry retaining by roof cutting conditions.
Keywords：gob-side entry retaining by roof cuttingmining overburdenmechanical characteristicspace-time evolutionmicroseismic monitoring
Publication Date：2026-01-30
Online Publishing Date：2026-01-28(First online date of this platform, not the publication date of the document)
Pages：16( 88-103 )