Abstract In order to effectively predict and control the rib spalling and roof leakage, it is necessary to reveal the deformation and failure mechanism of the chamber and propose the corresponding surrounding rock control technology. Based on uniaxial compression experiments and numerical simulations, it is concluded that coal body damage is dominated by shear failure during uniaxial compression, which indicates to some extent the main form of damage of the surrounding rock in the chamber. Then the combined finite and discrete element method is used to establish a numerical model to reveal the evolution law of fracture in the surrounding rock. The simulation results show that after the excavation of the chamber, a large amount of shear failure occurred in the ribs and the roof. Then those cracks further developed, expanded, penetrated, and finally connected with the surface of the chamber. Under the effect of the mine pressure, the coal body is separated from the surface of the chamber, leading to the occurrence of rib spalling and roof leakage. So it was given that support method by controlling crack development. The grouting and high-strength anchor bolt and anchor cable are proposed to improve the shear strength of the surrounding rock, which helps to reduce the occurrence of cracks, and inhibit the cracks from interpenetrating. An industrial test was carried out in the chamber of Tashan Coal Mine, which showed good control effect of the surrounding rock in the chamber.

中文翻译：

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超大断面全缝室变形破坏机理及控制技术

摘要 为有效预测和控制肋板剥落和顶板渗漏，需要揭示室壁变形破坏机理，提出相应的围岩控制技术。通过单轴压缩实验和数值模拟，得出煤体在单轴压缩过程中的破坏以剪切破坏为主，这在一定程度上说明了煤室围岩破坏的主要形式。然后采用有限元与离散元相结合的方法建立数值模型，揭示围岩断裂演化规律。模拟结果表明，开挖后的房室，肋骨和顶板发生了大量的剪切破坏。然后那些裂缝进一步发展、扩大、渗透，最后与腔体表面相连。在矿井压力的作用下，煤体与腔体表面分离，导致肋板剥落和顶板渗漏。因此给出了通过控制裂纹发展的支持方法。为了提高围岩的抗剪强度，提出了注浆和高强度锚栓和锚索，有助于减少裂缝的发生，抑制裂缝的相互贯通。在塔山煤矿井室进行了工业试验，对井室围岩进行了良好的控制。因此给出了通过控制裂纹发展的支持方法。为了提高围岩的抗剪强度，提出了注浆和高强度锚栓和锚索，有助于减少裂缝的发生，抑制裂缝的相互贯通。在塔山煤矿井室进行了工业试验，对井室围岩进行了良好的控制。因此给出了通过控制裂纹发展的支持方法。为了提高围岩的抗剪强度，提出了注浆和高强度锚栓和锚索，有助于减少裂缝的发生，抑制裂缝的相互贯通。在塔山煤矿井室进行了工业试验，对井室围岩进行了良好的控制。