关键词: 地下开采, 巷道支护, 注浆加固, 交岔点, 锚索, 支护参数

Abstract: The phase Ⅰ well lane open-out prolongation is building for -550 m level in Zhongjiu Iron Mine,in order to ensure the safety of roadway excavation and the effectiveness of temporary support,in view of the current situation of large section,broken surrounding rock and developed cracks for 6^# intersection at the -550 m level,the technical scheme of roadway surrounding rock stability prevention and control was put forward,which includes the combined support of anchor shotcrete-bolt + anchor cable and the reinforcement of deep and shallow borehole-high and low pressure coupled grouting. During the process of grouting reinforcement,firstly,the shallow pore-low pressure grouting technical was adopted to fill the cracks in the broken surrounding rock and compactness,so that the surrounding rock of the roadway has a certain pressure resistance ability,and the grouting ability of the deep surrounding rock was improved. Then,the deep hole and high pressure grouting technical was used to form the overall structure of the broken surrounding rock and the stable rock strata in the upper part of the roadway roof, which further improves the stability of the support system. Based on the method of theoretical calculation and numerical simulation,the supporting parameters were determined,and the the key technology and construction process of grouting reinforcement were analyzed. The practical effect is remarkable,which provides technical support for the subsequent safe construction of large section bifurcation points.