Research on the surrounding rock stability and its control during gob-side entry driving with a narrow pillar (GSED-NP) is of critical importance for ensuring safe mining operations and efficient production in underground coal mines. This work proposed a thick anchored dual-layer locking (TADL) supporting technology by analyzing the big and small voussoir beam (BSVB) weighting characteristics in GSED-NP as well as engineering implementation and on-site validation. First, field surveys and numerical simulation show that the 9.60 m and 10.65 m thick medium grained sandstone in the overlying strata were fractured in the coal body of the next face, and formed BSVB structure after rotation, subsidence, and re-hinging. Under the effect of stress transfer of BSVB structure, the lateral abutment pressure distribution is characterized by internal and external stress field (IESF) distribution. Second, numerical calculation was carried out according to the above characteristics. Third, a supporting technical scheme was formulated and implemented, and the field monitoring data proved the ideal outcome. Finally, the influence of the critical fracture location of the main roof on the stress distribution was discussed, and it is thought that the stress distribution is mainly related to the main roof fracture location which has a critical range on the stress transfer. This research can provide a reference for the surrounding roadway control under similar conditions.
Liang et al. (Thu,) studied this question.