The goaf formation of upper seam stope in proximity coal seams mining would influence the stability of the surrounding rock mass due to mining stress redistribution, which will seriously threaten the subsequent mining process and even ground environmental protection. Therefore, developing safe and efficient mining techniques, robust support strategies, and comprehensive safety evaluation systems is crucial for ensuring the overall safety of the mining process. Drawing upon on-site data, this study conducted a detailed feasibility analysis of the mechanized caving method. We developed a simulation model using similar materials, tailored for scenarios with overlying goaf, to demonstrate how lower seam mining was affected by the caving zone of the upper seam, leading to the progressive evolution of fracture networks. Furthermore, we employed numerical simulation models to juxtapose the simulated deformation areas with the actual potential deformation zones in the mining area. The mine seismic prediction (MSP) technique was utilized for the precise identification of unfavorable geological formations ahead of the working face, thereby preempting potential fractures or irregularities due to the presence of overlying goaf. In addition, a comprehensive support strategy was designed and implemented to bolster the stability of the roadways, thereby reinforcing the safety measures within the mining process. This study presents an integrated approach to investigate mining activities in the lower layers during stratified extraction, particularly how the overlying goaf of the upper seam affects the mining of the lower seam, leading to the progressive evolution of fracture networks. The findings and methodologies outlined in this work hold substantial practical significance, offering a pathway to enhance the reliability and safety of the mining process.

中文翻译：

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近煤层开采过程中围岩稳定性研究及地面控制技术可行性


近煤层开采上煤采场采空区的形成，会因开采应力重新分布而影响围岩的稳定性，严重威胁后续开采过程甚至地面环境保护。因此，开发安全高效的采矿技术、强有力的支持策略和全面的安全评估体系对于确保采矿过程的整体安全至关重要。本研究根据现场数据，对机械化崩落法进行了详细的可行性分析。我们使用类似的材料开发了一个模拟模型，专门针对上覆采空区的情况而设计，以演示下煤层采矿如何受到上煤层崩落区的影响，从而导致裂缝网络的逐步演化。此外，我们利用数值模拟模型将模拟变形区域与矿区实际潜在变形区域进行对比。利用矿井地震预测（MSP）技术来精确识别工作面前方的不利地质构造，从而预防由于上覆采空区的存在而可能出现的裂缝或不规则现象。此外，还设计并实施了全面的支持策略，以增强巷道的稳定性，从而加强采矿过程中的安全措施。本研究提出了一种综合方法来研究分层开采过程中下层的采矿活动，特别是上煤层的上覆采空区如何影响下煤层的采矿，从而导致裂缝网络的逐步演化。 这项工作中概述的发现和方法具有重大的实际意义，为提高采矿过程的可靠性和安全性提供了途径。