Stope stress field characteristics and disaster control mechanisms under cemented backfill drift mining

Cemented backfill drift mining gradually forms a distinctive quasi rectangular backfill structure composed of multiple backfilled drifts, under which stope ground pressure disasters occur frequently. To address this issue, the stress field characteristics of the stope and the corresponding disaster control mechanisms were investigated at Jinchuan No. 2. A three dimensional deposit model was established, and numerical simulation was integrated with uniaxial compression acoustic emission tests to characterise the form, distribution, and magnitude of the stress field. The formation mechanism of the stress field and the localisation of ground pressure disasters were identified. Results show that the maximum principal stress field exhibits a sag shaped distribution, with high stress areas concentrated mainly in the ore rock adjacent to the stope. The stress level of drift backfill is governed by structural boundary conditions. Ground pressure disasters are mainly localised in tunnels adjacent to the stope and on the high stress side of backfill bounded drifts. Field implementation indicates that backfill modification and external support strategies effectively improve tunnel stability. These findings clarify the link between structural boundary conditions, stress redistribution, and disaster localisation, and provide a basis for stress field characterization, disaster localization, and targeted support design under this mining method.