Underground Portal

RepairUndergroundStructuralUnderground Shotcrete Roof Repair of Hanging Lake Tunnel

Warren Harrison

During a Federal Highway Administration annual safety inspection in March 2007, a crack was found in the flat roof portion of the cut and cover section of the Hanging Lake Tunnels along Interstate 70 in Glenwood Springs, CO.

RepairUndergroundStructuralCrane and Other Equipment Savings or Elimination

Top 10 Sustainability #4

An often overlooked sustainability benefit of the shotcrete process is one of the most basic of construction problems: the conveying and handling of materials.

RepairUndergroundStructuralChetoogeta Mountain W&A Railroad Tunnel

Edwin Brady

Historical restoration/preservation is not only a challenging field of construction but also one that offers the special reward of preserving history for future generations,

RepairUndergroundStructuralThe Influence of Reinforcement on Relative Creep Deformations in Shotcrete Linings

E. Stefan Bernard

Shotcrete is now widely used for ground control in underground mining and civil tunnel construction throughout the world.

UndergroundStructuralWhen to Extract Cores

Lihe (John) Zhang

During preconstruction testing and mockups, as well as during shotcrete production, a minimum specified compressive strength is always required in the project specification.

RepairUndergroundAccelerator Dosing Pump Calibration and Verification

Lihe (John) Zhang

Accelerators are widely used for underground shotcrete applications.

RepairUndergroundStructuralShotcrete Nozzleman Basics? Vertical Wall Construction

Oscar Duckworth

Why Specific Techniques at the Footing to Wall Joint Are Essential to Product Quality

RepairUndergroundStructuralODOT U.S. Highway 26 Dennis L. Edwards Tunnel Project

Larry Totten and Reg Ryan

SafetyRepairUndergroundStructuralThe Danger of Fallouts in Overhead Shooting

William Clements

The volume of shotcrete required to cover an area of only 3 ft2 (0.3 m2) with a 4 in. (100 mm) thickness would typically weigh approximately 140 lb (64 kg), a weight that?if dropped from a height of 10 ft (3 m)?would seriously endanger the

RepairUndergroundStructuralIncline Tunnel—S&S Quarries, Inc

Edwin Brady

The Incline Tunnel, S&S Quarries, Inc., is the access to an underground rock mine in Knoxville, IA, owned by Bruening Rock Products.