This paper studies and introduces the successful case of gob-side entry retaining technology and the typical mining pressure law in Luan mining area, which is the main mining coal seam in Qinshui coalfield. Qinshui coalfield has an estimated coal reserve of 300 billion tons, accounting for 9.58% of the total national coal reserve in China, especially anthracite, chemical coal, and coking coal. The methods of field investigation, theoretical analysis, physical experiment, and industrial test are adopted. Through the field investigation, theoretical analysis, physical experiments, and industrial test, the following conclusions have been drawn in this study: (1) A thorough engineering geological investigation was conducted on the entry retaining along the gob side on noncoal pillar mining working face, which covers multiple periods of mining process including the roadway excavation period, primary mining period, primary mining stability period, and secondary mining influence period. A series of analysis and tests were conducted such as core sampling, rock mechanics property testing, borehole detection, and flexible formwork support evaluation, which laid a foundation for identifying the mining pressure law of gob-side entry retaining by using noncoal pillar mining. (2) The mining pressure law was studied through the collection of the field measurements taken from the entry retaining along the gob side on noncoal pillar mining working face. The keys to achieve the roadway surrounding rock stability through noncoal pillar mining are obtained. According to the study, the stability control of retained roadway surrounding rock mainly depends on the stability of top coal, coal side, and shoulder angle coal. (3) In this study, a roadway reinforcement scheme is proposed to improve the surrounding rock control technology for gob-side entry retaining by noncoal pillar mining, whose effectiveness has been verified by a series of industrial test. Therefore, the wide adoption of the noncoal pillar mining method in Number #3 coal mine can significantly relieve the predicament of coal pressing under a large number of buildings in Luan mining area, which provides insightful guidance to the coal-free pillar mining in the whole Luan mining area.

中文翻译：

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沿空采空区围岩围岩变形与控制技术研究

本文研究介绍了采空区留巷技术的成功案例以及沁水煤田主要采煤层Lu安矿区的典型开采压力规律。沁水煤田的煤炭储量估计为3000亿吨，占全国煤炭总储量的9.58％，尤其是无烟煤，化学煤和炼焦煤。采用现场调查，理论分析，物理实验和工业测试的方法。通过现场调查，理论分析，物理实验和工业试验，得出以下结论：（1）对非煤柱开采工作面沿沿采空区的巷道护壁进行了全面的工程地质调查，它涵盖了采矿过程的多个阶段，包括巷道开挖期，一次开采期，一次开采稳定期和二次开采影响期。进行了岩心取样，岩石力学性能测试，钻孔检测和柔性模板支撑评估等一系列分析和测试，为通过非煤柱开采识别采空区留巷的开采压力规律奠定了基础。（2）通过收集沿非煤柱开采工作面沿沿采空区一侧入口保持的实测数据，研究了开采压力规律。获得了通过非煤柱开采实现巷道围岩稳定的关键。根据研究，保留巷道围岩的稳定性控制主要取决于顶煤，侧煤和肩角煤的稳定性。（3）本研究提出了一种巷道加固方案，以改善围岩控制技术，该方法可通过非煤柱开采来保持采空区侧入巷道的安全，其有效性已通过一系列工业测试得到了验证。因此，三号煤矿广泛采用非煤柱开采方法，可以大大缓解栾安矿区大量建筑物下压煤的困境，为整个无煤柱开采提供指导。栾矿区。为了提高围岩控制技术的有效性，提出了一种巷道加固方案，以通过非煤柱开采来保持采空区侧入巷道的控制技术，其有效性已通过一系列工业试验的验证。因此，三号煤矿广泛采用非煤柱开采方法，可以极大地缓解Lu安矿区大量建筑物下压煤的困境，为整个无煤柱开采提供指导。栾矿区。为了提高围岩控制技术的有效性，提出了一种巷道加固方案，以通过非煤柱开采来保持采空区侧入巷道的控制技术，其有效性已通过一系列工业试验的验证。因此，三号煤矿广泛采用非煤柱开采方法，可以极大地缓解Lu安矿区大量建筑物下压煤的困境，为整个无煤柱开采提供指导。栾矿区。