Parameter Optimization on Bolt Supporting of Deep Roadway Surrounding Rock

Abstract:

Aimed at the parameter optimization problem of bolt supporting in deep high stress roadway surrounding rock, by the numerical simulation method, support schemes were evaluated and optimized on north wing blind incline shaft in Shi-shang Mine. Based on original support scheme and considering the bolt spacing, row spacing and length, twenty programs were proposed and calculated, analyzed respectively. The results showed that as the inter-row of anchor increased, the deformation of roadway surrounding rock grow slowly in the first and then the growth was accelerated and there is a turning point between the two phases. With the anchor length reduced, the deformation of roadway surrounding rock showed the same law. Last, according to the results, the original supporting parameters were adjusted, and that is inter-row of anchor changed from 800mm×800mm to 1200mm×1600mm and length changed from 2000mm to 1600mm. After adjustment, the cost of supporting saved directly and it has provided technical support to promote rapid excavation.