The optimization of roadway supporting parameters based on the characteristics of surrounding rock in fault area and on-site geological conditions is helpful to improve the supporting effect of surrounding rock and ensure the stability of surrounding rock.Taking 90307 air return roadway crossing BF21 fault as the engineering background,the problems existing in the supporting parameters of the original anchor mesh cable were analyzed,and combined with the site conditions,the combination of long and short anchor cable was proposed to support the surrounding rock.Meanwhile,the short roof cable was used as the hollow grouting cable to strengthen the fractured rock mass and improve the coupling effect of the anchor cable and roof through roof grouting.After engineering application,the roof and floor and two sides of 90307 air return roadway were 150.87 mm and 56.74 mm respectively during crossing BF21 fault,and the deformation of surrounding rock was small on the whole,so the roadway section can meet the needs of excavation and subsequent use of the air return roadway.
维普
万方数据