深井软岩大断面硐室二次锚网索耦合支护技术研究

Study on coupling support technique of second bolt-mesh and cable for large section soft-rock chamber in deep mine

当前我国煤矿深井软岩巷道普遍存在所处地应力水平高、围岩强度低的问题,矿井基建过程中以往大断面硐室采用的混凝土碹、棚式支架及普通锚网支护方式已难以控制围岩的强烈变形,在分析软岩巷道变形特征和以往支护失效机理基础上,针对大断面软岩硐室特点,提出二次锚网索耦合支护技术方案,并成功应用于工程。

At present, the high geo-stress, low strength in soft surrounding rock problems are generally exits in national coal mine. The previous support techniques such as arch walling, frame and bolt-mesh can not be controlling the large displacement of soft surrounding rock. Based on the analysis of characteristic deformation and failure mechanism of previous support, and according to the features of large section soft-rock chamber, the coupling support technique of second bolt-mesh and cable is proposed and applied successfully in engineering practice.