A New Method for Calculating Anchor Mesh Parameters Based on the Energy Absorption Mechanism of Helmet

Abstract

Considering the pressure-bearing mechanism of the safety helmet and as an anchored net is subjected to the surrounding rock mass, researchers should regard the support force as a safety criterion. Thus, a method for calculating the anchored mesh support parameters (mesh width and reinforcement diameter) is proposed in this paper. The method can provide a theoretical basis for selecting the technical parameters of an anchored mesh in active support in underground engineering. Calculation results show that a strong power relationship exists between the mesh width a of the anchor net and the distance h3 from the anchor net to the top of the worker’s safety helmet, that is, $a=12.891e^{-0.065h_3}$ , and the correlation coefficient is $R^2=0.947$ . Moreover, the mesh width of the anchored mesh decreases with an increase in the distance from the anchored mesh to the top of the worker’s safety helmet. The anchored mesh parameters designed and selected by this method ensure that the rocks falling from the anchored mesh pose no safety threat to the workers wearing helmets. The parameters also prevent an excessively large steel wire/steel bar diameter of the anchored mesh, which lowers support costs and makes the selected technical parameters of the anchored mesh economical and safe.