As the development characteristics of cracks of the chamber are closely related to the bolt and cable anchoring parameters, the original rock stress of the surrounding rock, and fracture degree, this paper proposes the control method for chamber in extra-thick coal seam by the crack development characteristics. Based on the numerical model analysis, the chamber generates a large amount of shear cracks. Then, these cracks further extend and expand. When the cracks penetrate each other, the chamber bearing capacity decreases sharply, and the corresponding displacement also increases significantly. Based on the above rules, a chamber control method by high-strength anchor bolts and grouting reinforcement is proposed to improve the rock shear strength. By optimizing the anchor bolt parameters and grouting parameters, such as spacing, length, and the grouting pressure, the cracks are significantly reduced and the cracks are prevented from penetrating. Finally, an industrial test was conducted in the chamber at Datong Coal Group, and the chamber deformation was well controlled.

中文翻译：

---

基于煤岩体破裂特征的特厚煤层腔室控制

由于煤层气室裂缝的发展特征与锚索锚固参数，围岩的原始岩石应力以及裂缝程度密切相关，因此提出了利用裂缝控制特厚煤层煤层气室的方法。发展特点。根据数值模型分析，腔室会产生大量剪切裂纹。然后，这些裂缝进一步延伸和扩展。当裂缝相互渗透时，腔室的承载能力急剧下降，相应的位移也显着增加。基于上述规律，提出了一种采用高强度地脚螺栓和注浆加固的控制室的方法，以提高岩石的抗剪强度。通过优化地脚螺栓参数和灌浆参数（例如间距，长度，灌浆压力明显降低了裂缝，防止了裂缝的渗透。最后，在大同煤业集团的炉膛中进行了工业测试，并很好地控制了炉膛的变形。