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Aug 30, 2024
Pipeline Construction through Sensitive Glaciomarine Clay
Authors: Daniel Ho, P.Eng. [email protected], Patrick Korner, P.Eng. [email protected], Keith Robinson, P.Eng. [email protected], Jiejun Zhao, P.Eng. [email protected], Adriana Luis, P.Eng. [email protected], Cameron Ross, P.Eng. [email protected], and Caroline Silins, P.Eng. [email protected]Author Affiliations
Publication: Pipelines 2024
ABSTRACT
During the construction of Coastal GasLink (CGL) through the town of Kitimat, BC, the Project encountered sensitive glaciomarine clay (GMC) that extended up to 40 m in depth along the pipeline right-of-way. While sheet piling is a common solution utilized to stabilize otherwise unstable trench wall conditions, cantilever sheet piles rely on competent soil at depth for toe resistance which provides the lateral support required for safe trench excavation. Due to the significant depth of the GMC, the lack of toe resistance severely limited the capacity of any installed sheets regardless of the steel section utilized. Reinforcing the entire length of cantilever sheet pile wall (SPW) trench with structural cross-bracing was not a suitable alternative for the soft GMC area due to interference with pipe installation sequences and project schedule implications. To meet regulatory pipeline installation requirements and successfully construct through this sensitive area, the Project utilized a combination of shallow trench and soil mounding construction to successfully install the pipeline, minimizing the need for cross trench bracing to short sections only at watercourse crossings, where the pipe had to be deeper. A robust field monitoring program was also implemented to ensure that construction was completed within the predicted bounds of a finite element soil model, which was calibrated with deflection limits that considered the sensitive nature of the GMC.
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REFERENCES
Canadian Geotechnical Society. (2006). Canadian Foundation Engineering Manual, 4th Edition.
Google. (2023). Google Earth Pro Version 7.3.6.9345. British Columbia, Canada. 54° 3’ 32.00”N, 128° 38’ 17.00”W, Eye alt 423.70 kilometers. Google, SIO, NOAA, U.S. Navy, NGA, GEBCO 2023. Landsat/Copernicus 2023.
Bentley Systems. (2023). PLAXIS 2D Version 22.01.00.452, Connect Edition.
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Published online: Aug 30, 2024
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1Section 8W Pipeline Implementation, Coastal GasLink Project, TC Energy, Calgary, AB. Email: [email protected]
2Manager, Geotechnical Engineering, Tetra Tech Canada, Inc., Vancouver, BC. Email: [email protected]
3Princpal Geotechnical Consultant, Tetra Tech Canada, Inc., Vancouver, BC. Email: [email protected]
4Project Engineer, Tetra Tech Canada, Inc., Lethbridge, AB. Email: [email protected]
5Project Engineer, Tetra Tech Canada, Inc., Vancouver, BC. Email: [email protected]
6Project Engineer, Tetra Tech Canada, Inc., Vancouver, BC. Email: [email protected]
7Project Engineer, Tetra Tech Canada, Inc., Victoria, BC. Email: [email protected]
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