Numerical simulation study on optimization of supporting parameters of a new type of tension dispersed bolt

Abstract

In order to solve the problem that traditional bolt cannot effectively adapt to the complex stress environment of deep rock roadway, taking a roadway as the engineering background and aiming at a new type of tension distributed bolt, the roadway support under different combination schemes of 5 main parameters, such as bolt length, bolt spacing, bolt row spacing, bolt diameter and anchoring length, is numerically simulated based on the control variable test design method. The deformation of roadway surrounding rock and the change of vertical stress are analyzed; the optimal parameters of bolt support and the main and secondary order of influence of each parameter on the control effect of roadway surrounding rock deformation are given. The results show that, based on the control effect of bolt parameters on roadway surrounding rock, the optimal bolt parameters are as follows: bolt length 2.5 m, bolt body diameter 22 mm, anchor length 0.5 m and row distance between bolts 0.6 m. The stability of surrounding rock and the safety of roadway can be effectively controlled through the optimization of supporting parameters.

Keywords

• tension dispersed bolt
• bolt support
• numerical simulation
• controlling effect
• parameter optimization