Experimental and Numerical Simulation Research on Anti-Blasting Mechanical Properties of Npr Anchor Cable in Deep-Buried Roadway

Abstract

The deep buried roadway is in the complex mechanical environment of “three highs and one disturbance”, which causes the problems of rockburst and large deformation, making it difficult to support the roadway. The interaction between surrounding rock and support anchoring mechanism is the core of the rock underground engineering support theory. The deep-buried roadway of Hongyang No.3 Mine was taken as the research test section. The anchorage mechanism of negative Poisson's ratio (NPR) rock mass under high stress rate in deep roadway was established, the anti-blasting field test of environmental rock mass-roadway was conducted, and the FLAC3D-PFC3D particle flow coupled impact support simulation is proposed. The numerical models of PR anchor cable and NPR anchor cable are established respectively. Comparative analysis of the surrounding rock and the force and displacement of the anchor cables under different supporting conditions of dynamic loads were conducted through field tests and numerical simulation. It is concluded that PR anchor cable support mostly failed under the peak impact pressure and the coupling wall was seriously deformed. Further, although the chamber showed convex arc deformation and failure, none of the NPR anchor cables failed and the chamber maintained good stability.

Keywords: Deep buried roadway, Anti-blasting, NPR rock mass, FLAC3D-PFC3D, Chamber stability