Instrumentation & Performance of Tied-Back Shotcrete Shoring in Sand Adjacent to a Hospital Structure
Carol Domitric & Matthew Janes
Recent additions to the Brantford General Hospital expansion included construction of a new hospital wing, involving excavations of up to 11 metres (36 feet) depth, in loose to compact sand adjacent to an existing eight-storey hospital structure. The tendered contract called for interlocking caisson walls. An alternative method of temporary excavation support, tied-back shotcrete shoring, was proposed by HC Matcon Ltd. View PDF.
Removal of Overhead Concrete Bridge Over an 8 Lane Highway Without the Use of Detours
Chandru Hira & Richard Zakaib
The paper describes the technique used to dismantle a reinforced concrete bridge over a busy 8 lane highway without using detours or stopping traffic flow below the bridge. The scheme basically consisted of supporting the bridge on trestles at mid span of the bridge off the median of the highway below and then saw-cutting the bridge longitudinally into slices and lifting the sliced units, one at a time, by a crane sitting behind the bridge abutments, clear of the highway below. View PDF.
St. Clair River Rail Tunnel, Sarnia Design - Design and Construction of a Shaft for the TBM Cutterhead Retrieval
Brian Isherwood, Nadir Ansari & Peter McDonald
The planning, design, and construction of the new St. Clair River Tunnel has been described in several previous papers with some mention of the unplanned Retrieval Shaft which was necessary to remove and service the Cutterhead of the Tunnel Boring Machine before it passed under the St. Clair River. This paper describes the design and construction of the shaft and touches on the difficulties and risks involved with crash-programme rescue operation. View PDF.
The Bow, EnCana: Design, Monitoring, and Results of a Deep Excavation in Downtown Calgary
Matthew Janes & Thomas Lardner
The Bow office complex will become the new headquarters of EnCana Corporation, a leading Canadian oil and gas company. The shoring system, encompassing nearly two city blocks to a depth of 20.5 m was required to support the surrounding utilities and buildings in downtown Calgary. Past excavations in the area experienced large amounts of rock movement, whose mechanics were poorly understood. The focus of this paper is the design process and construction results concerning rock movement and the effectiveness of the shoring structure. View PDF.
Numerical Analyses on the Wall Deflections of The Bow Excavation
Quangfeng Qu, KwanYee Lo, Matthew Janes, Silvana Micic & Thomas Lardner
The construction of The Bow office tower involved an excavation approximately 100 m wide, 190 m long, and 21 m below ground surface. This paper presents a finite element analysis of stress and displacement caused by the excavation, and then evaluates the influence of the shear band and the weak zone in rock by comparing the measured performance of the shoring system with the calculated. View PDF.
Soil Nailing Earth Shoring System - A Ten-Year Update
Nadir Ansari & Carol Domitric
In the past forty years, one of the major trends in earth retaining structure design has been towards reinforcement methods which improve the internal strengths of soil masses sufficiently to make them self supporting. These methods include the New Austrian Tunneling Method (NATM), Reinforced Earth, and Soil Nailing. View PDF.