Zhang Chunwang, Wang Jiong, Chang Weixin, Wang Junjie
State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology Beijing, Beijing, 100083, China.
School of Mechanics and Civil Engineering, China University of Mining & Technology Beijing, Beijing, 100083, China.
Heliyon. 2024 Jul 2;10(13):e33552. doi: 10.1016/j.heliyon.2024.e33552. eCollection 2024 Jul 15.
Single Recovery Roadway (SRR) is a novel retraction technology in the non-pillars mining innovation system. In previous support withdrawing, single recovery roadway was usually replaced by a dual-recovery roadway or cut the coal wall before the support. This study is set against the background of the longwall panel at Duanshi Coal Mine, where a mechanical model based on the stress characteristics of a composite cantilever beam was constructed to analyze the failure of the main roof in a single recovery roadway. Through numerical analysis, the relationship between deformation failure of the recovery roadway and interlayer slippage structures was explored, as well as how mining-induced stress distribution and the evolution of key strata fractures impact the stability of the roadway. The results indicate that after the connection of the longwall panel and the recovery roadway, the overlying composite interlayered rock strata are affected by the interlayer slippage structures, leading to significant asymmetric deformation in the surrounding rocks. Additionally, borehole observation data support the theoretical calculations of the cantilever beam model. These research results enhance the understanding of the interlayer slip instability mechanism and provide important guidance for mine design under similar geological conditions.
单回撤巷道（SRR）是无煤柱开采创新系统中的一种新型回撤技术。在以往的支护回撤过程中，单回撤巷道通常会被双回撤巷道取代，或者在支护前切割煤壁。本研究以段氏煤矿长壁工作面为背景，构建了基于复合悬臂梁应力特性的力学模型，以分析单回撤巷道中老顶的破坏情况。通过数值分析，探讨了回撤巷道变形破坏与层间滑移结构之间的关系，以及采动应力分布和关键层断裂演化对巷道稳定性的影响。结果表明，长壁工作面与回撤巷道连通后，上覆复合层状岩层受层间滑移结构影响，导致围岩出现明显的不对称变形。此外，钻孔观测数据支持悬臂梁模型的理论计算。这些研究结果加深了对层间滑移失稳机制的理解，为类似地质条件下的矿井设计提供了重要指导。
