Underground Portal

UndergroundStructuralSoil and Rock Slope Stabilization Using Fiber-Reinforced Shotcrete in North America

Mike Ballou and Matt Niermann

UndergroundWelcome to Underground Atlanta

Charles M. Brown

We are standing in the very bowels of the City of Atlanta. This isn™t the trendy œUnderground Atlanta of rock-till-you-drop nightclub fame. The millions of busy Atlanta citizens above us today don™t have any idea that we are down here. All they care about is

UndergroundShotcrete for Ground Support: Current Practices in Western Canada

Cesar Chan, Roland Here, and Dudley R. Morgan

Each ground-support project is unique and will likely have its own design and performance re-quirements. Performance requirements for shotcrete can generally be divided into two groups: fresh state parameters and hardened state parameters. The following briefly elaborates on the variables included in each of these

UndergroundStructuralDetermination of Early-Age Compressive Strength of Shotcrete

Roland Here and Dudley R. Morgan

Tere has long been a need for a reliable, simple-to-use means of determining the early-age rate of strength gain in shotcrete.During approximately the first 24 hours after shotcrete has been placed, its compressive strength is typically too low to measure using standard core-extraction and testing

UndergroundStructuralDesign Guidelines for the Use of FIber-Reinforced Shotcrete in Ground Support

F. Papworth

Developments in Shotcrete in Hobart, Tasmania, Australia in April 2001. One of the outstanding papers presented at the Conference was a paper by Grant, Ratcliffe and Papworth on œDesign Guidelines for the use of SFRS in Ground Support. Frank Papworth was asked to submit an

UndergroundStructuralInternationalShotcrete for Underground Support

Dr. Rusty Morgan

In November 1999 I had the opportunity to attend the Third International Symposium on Sprayed Concrete for Underground Support.

UndergroundStructuralInternationalShotcrete Red Hot in Peru

Hugo Armelin and Denis Blais

An1amina copper mine is a Sl.2 btltion projcc1 in lhe Andes Mountailh of Peru. The projeci. owned by Canadian mining gi3111S Norandll. J’cck and Rio Afgom, i.s one of the. single largest mining inveso:nents in 1be Americ:iô€€£ at this moment and oomprises the cons1ruction of

UndergroundMoab Khotsong Mine, Part 2

Jon Buckley

Having discussed the basics for the successful application of SFR wctcrete, the issue of its quality maintenance needs to be addressed. There are a num­ber of critical indicators that the placed product has to meet.

UndergroundPerformance of Dry-Mix Shotcrete in Permafrost Environment

Jean-Francois Dufour

In order to achjeve the objective. it was impor­tant to develop a mix lhat would rapidly generate a high heac of hydration. The cold ambient air would cool down 1he shotcrete but the heat released dur­ing the hydration process would allow 1he hydra­tion of ccmem

UndergroundMaking Dry-Mix Shotcrete Go the Distance Underground

Joe Duro

Dry-mix shotcrete as a means of grouad support for lunnels and mining drifls is fasl, eflicient, and very safe when properly applied. lls effecliveness is unmatched: I can remember lining unstable clay mining tunnels (drifts) using a layer of shotcrete, wire mesh, and another layer