Study on the coupling relationship between support and surrounding rock and the app-licability of support in shallow buried high mining faces of the Shendong Mining Area

ObjectivesTo address the challenges of controlling surrounding rock in shallow-buried， high-intensity mining faces in the Shendong mining area， this study investigates the coupling relationship between supports and surrounding rock structures.MethodsThe research combines theoretical analysis with field measurements， employing the “masonry beam” mechanical model of overlying rock to analyze the interaction between supports and surrounding rock in high-mining faces.ResultsThe study examines mining pressure patterns， optimal support working resistance， and its applicability under specific conditions in the mining area. Findings indicate that the self-weight and rotational deformation of fractured roof rock masses significantly influence the dynamic load on the roof. The combined stiffness of the “immediate roof， support， and floor” affects the fracture location of the main roof， reducing both the force and duration of roof pressure acting on the support. A coupling relationship between supports and surrounding rock exists， characterized by stiffness， strength， and stability.ConclusionsA “support， protection， and mining three-factor method” is proposed to evaluate the applicability of supports. Methods such as estimating rock self-weight， analyzing measured end-of-cycle support resistance with an added standard deviation， and applying the rock beam transmission theory are used to validate the working resistance of supports. These findings provide a scientific basis for support selection and applicability evaluation under similar conditions.