A Developed Analytical Formula for Horizontal Pressure on Barricades at Vertical Granular Backfilled Vertical Stopes: Fid-Bau Portal

A Developed Analytical Formula for Horizontal Pressure on Barricades at Vertical Granular Backfilled Vertical Stopes

El Kamash, Walid

In underground mines, a stope can be used to supply workers and machinery with a safe and secure work area. It is important to properly assess the pressures applied to walls and barricades placed close to the center of the stope to preserve the filling materials in order to ensure the secure application of the backfill. An analytical formula describing the horizontal pressure of the barricades is therefore needed. However, the investigation of this analytical formula has not attracted many researchers, although it is important to avoid accidents due to the failure of the barricades. The proposed approaches to investigating the stress of barricades are discussed in this research. The authors then propose a new two-dimensional analytical solution based on the formula of Mastron. The solution presented depends on dividing the stope drive into three segments at three stages of the solution. This solution considers the transfer of load from the backfill to the walls of both the stope and the access drift. In general, the solution takes into account the effect of the stress state of the barricade position within the drift. The results are compared between the solution proposed and the test results for the physical model and the numerical simulations. A reasonable agreement between the different results suggests that this proposed formula provides a good forecast of the pressure on the barricade. For fully drained granular backfill, this proposed solution presented here applies to backfill without water-pore pressure.