Predicting and controlling the collapse of surrounding rock (especially broken rock masses) in underground chambers is an important topic in mining and geotechnical engineering. Based on an example, this paper introduces a case study of surrounding rock stability control technology in stope mining around abandoned areas. Based on on-site coring, mechanical properties of rock samples, and on-site grouting reinforcement technology, the TRT6000 advanced geological prediction system was used to predict the stability status of the surrounding rock of the underground chamber. AUTODYNA software was used to build a dynamic coupling model for numerical simulation prediction and optimization of blasting parameters and to reveal the dynamic variation in the surrounding rock. The dynamic failure process of the surrounding rock of the chamber before and after optimization of the blasting parameters is simulated, and the deformation characteristics and damage and acoustic emission characteristics of the surrounding rock are clearly shown. The surrounding rock failure first appeared around the surface of the underground chamber because of the high stress concentration around the surface of the chamber after blasting; with the interaction between the explosive gas and the rock mass, the damaged area further propagated into the external rock, eventually leading to a large damage area. At the same time, there is a large tensile failure in the rock, resulting in expansion and rupture around the underground chamber. Finally, the 3D laser scanning method is used to verify the superiority of the optimized blasting initiation sequence. The new edge hole detonation sequence can effectively improve the blasting vibration and successfully control the further damage of the surrounding rock of the underground chamber, thus proving the edge hole drug pack. Moreover, the initiation mode of the delay stage of the side hole charge is determined. This study provides a useful reference for the stability control of surrounding rock in mining in mining areas.

中文翻译：

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塌陷采场区边缘巷道开挖破碎围岩稳定性控制案例研究

预测和控制地下室围岩（特别是破碎岩体）的坍塌是采矿和岩土工程中的一个重要课题。结合实例，介绍了废弃区采场开采围岩稳定性控制技术的案例研究。基于现场取心、岩样力学特性、现场注浆加固技术，采用TRT6000超前地质预测系统对地下室围岩稳定性状态进行预测。AUTODYNA软件用于建立动态耦合模型，用于爆破参数的数值模拟预测和优化，揭示围岩的动态变化。模拟爆破参数优化前后腔室围岩的动力破坏过程，清晰显示了围岩的变形特征和损伤及声发射特性。由于爆破后地室表面周围应力集中，围岩破坏首先出现在地下室表面周围；随着爆炸性气体与岩体的相互作用，破坏区域进一步扩展到外部岩石中，最终形成较大的破坏区域。同时，岩石中存在较大的拉伸破坏，导致地下室周围发生膨胀破裂。最后，采用3D激光扫描方法验证优化爆破起爆序列的优越性。新的边孔爆轰序列能有效改善爆破振动，成功控制地下室围岩的进一步破坏，从而证明边孔药包。此外，还确定了侧空穴电荷延迟阶段的启动方式。该研究为矿区开采围岩稳定性控制提供了有益的参考。