Strata Control Mechanism and Coordinated Mining–Backfilling Technology for Grouped Strip Backfill Mining

Grouped strip backfill mining has become an effective approach for controlling strata movement and protecting surface structures in coal mining beneath villages. However, the evolution mechanism of roadway support conditions during the mining–backfilling process and the corresponding strata control mechanism remain insufficiently understood. Taking the CTS2‐01 panel of Changcun Coal Mine as an engineering case, this study investigates the coordinated strata control mechanism and mining–backfilling technology for grouped strip backfill mining. Based on the Euler–Bernoulli beam theory and the Winkler elastic foundation model, roof mechanical models under three typical roadway support structures, namely coal–coal (C–C), backfill–coal (B–C), and backfill–backfill (B–B), were established to reveal the evolution of load transfer characteristics during the mining–backfilling cycle. A coordinated mining–backfilling technology incorporating cyclic double‐strip staggered mining, self‐stabilizing isolation baffles, and staged backfilling procedures was further developed and verified through field application. The monitoring results demonstrate that roadway deformation decreases significantly with the evolution of the support structure from C–C to B–B. Compared with the C–C structure, the B–B structure reduces the maximum roof‐to‐floor convergence and sidewall convergence to 46 and 39 mm, respectively, while markedly improving roadway stability. The proposed technology effectively optimizes the roof load‐bearing mechanism by promoting coordinated support between coal pillars and backfill bodies, providing both theoretical guidance and engineering support for grouped strip backfill mining under similar geological conditions.