Abstract:To investigate the influence mechanism of gob-side filling body properties on overburden stability in gob-side entry retaining, this study combines physical modeling and numerical simulation to identify key parameters affecting overburden stability and analyzes their governing patterns. The results indicate that the compression modulus and supporting strength of the gob-side filling body are the dominant factors controlling overburden subsidence during gob-side entry retaining. Specifically, both parameters exhibit negative correlations with overburden subsidence: as the compression modulus increases within the 0. 5 ~ 1. 2 GParange, subsidence decreases significantly, with optimal suppression achieved between 0. 5 ~ 1. 2 GPa before diminishing beyond 1. 2 GPa; similarly, when supporting strength ranges from 0. 5 ~ 2. 0 GPa, higher strength markedly reduces subsidence, though this effect weakens beyond 2. 0 GPa. This study clarifies the effects of the compression modulus and supporting strength of the gob-side filling body on the variation law of overburden subsidence, laying a theoretical foundation for maintaining overburden stability in gob-side entry retaining.
