Toronto Transit Commission Relief Line South Toronto Transit Commission

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Toronto Transit Commission Relief Line South Toronto Transit Commission The engineering support services provided by GZ included Location: Toronto, Canada preliminary design of the temporary and permanent support measures for the SEM caverns in the swelling conditions as well Date: 2017 - 2019 design of the waterproofing system. In addition, GZ provided constructability reviews and value engineering studies for the stations, as well as for the alignment. Structure: 2 large diameter underground Station caverns Length: 4.66 mi (7.5 km) Geology: Georgian Bay Shale, glacial tills Cost: - Client: HDR Owner: Toronto Transit Commission Preliminary SEM Station Design: n 2017, the Toronto Transit Commission approved the I Preliminary Engineering Design of the Relief Line South Project, which was a planned new 7.5 km long subway line that was intended to run through the center of downtown Toronto. The project was to connect the Yonge-University-Spadina Subway (Line 1) to the Bloor-Danforth Subway (Line 2) in the downtown area. The goal of the Relief Line South was to help relieve Figure 1. Proposed Relief Line South arrangement with stations. crowding on Line 1 south of Bloor, at the Bloor-Yonge Station, and on the surface transit routes coming in and out of downtown. Construction planning of the Relief Line South included construction of twin running tunnels by means of tunnel boring machines, five new stations, and modifications to three existing stations, which will be converted to interchange stations. Design of the Relief Line South progressed to the preliminary engineering stage, and was consequently re-envisioned as the southern section of the Ontario Line Project. Several Station design concepts from the Relief line have been adopted for the new Ontario Line. The Ontario Line South is expected to begin Construction in 2021. Gall Zeidler Consultants (GZ) provided preliminary engineering services for the design of the Sherbourne and Sumach stations. The stations were planned to be mined in hard rock, specifically in Georgian Bay shale, which is prone expansive behavior and Figure 2. Proposed cross-section for the Sumach Station SEM associated time dependent defamations. Cavern showing a center platform configuration. www.gzconsultants.com .

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Update on Metrolinx Transit Expansion Projects – Second Quarter 2021
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