高应力超大断面硐室围岩控制对策研究

针对深部高应力超大断面硐室围岩易失稳的问题，以红庆河煤矿设备换装硐室为工程背景，采用FLAC3D数值模拟软件分析了在低扰动掘进条件下超大断面硐室的围岩应力分布特征及变形规律，结果表明：高应力条件下，超大断面硐室塑性区范围明显变大，硐室帮部及底板相对于顶板更容易发生失稳，并提出强力一次全断面支护对策，底板锚索采用水泥灌浆实现全长预应力锚固。现场实践表明，硐室围岩稳定，变形量控制在30mm以内。

Study on control countermeasures of surrounding rock of high stress super-large section chamber

Based on the problem that the surrounding rock of deep high stress and super large section chamber is easily unstable，taking the equipment replacement chamber of Hongqinghe coal mine as the engineering background, with the numerical simulation method , the stress distribution characteristics and deformation law of the surrounding rock of the super-large cross-section chamber under low-disturbance driving conditions was analyzed. Under high stress conditions, the plastic zone of the super-large cross-section chamber becomes significantly larger; The wall and floor of the chamber are more prone to instability. Based on this, high pretensioned stress and intensive bolting system is proposed to control the surrounding rock of the high-stress ultra-large section chamber. The bottom plate anchor cable is cement grouted to achieve full-length prestressed anchoring. Field practice shows that the chamber is very stable and the amount of deformation is controlled within 30mm.