Mechanical mechanism and theoretical analysis of anchor net support based on model test and numerical simulation

Abstract

AbstractThe control of broken rock mass roadways has always been a difficult problem in metal hard rock mines. In this paper, the mechanical mechanism of anchor net support is characterized and simulated through the physical model test of the prestressed support self-bearing structure of the broken rock mass. The deformation characteristics and interaction relationships of the surrounding rock and the support body under different dynamic impact effects are obtained by using the embedded anchor strain gauge and rock micro-strain sensors. The stress evolution process and deformation characteristics of the anchor and rock mass of the prestressed support self-bearing structure of the broken rock mass under different loads are simulated by applying Phase2. The results are in good agreement with the results of the physical model test. Based on the theory of surrounding rock compression arch and the Hoek-Brown criterion, the minimum anchorage force of the prestressed anchor to maintain the stability of the surrounding rock is derived and calculated by the limit equilibrium rule. The research results explain the mechanical mechanism of the broken rock mass support from the aspects of physical experiments, numerical simulations and theoretical derivations, which can provide theoretical guidance for the support design of practical engineering.

Keywords

• Anchor net support
• fractured rock
• physical model
• dynamic impact
• numerical simulation
• composite arch