Project Details
Location: Morris, MB.
Client: Manitoba Infrastructure, Water Management and Structures
Completed: October 2016
Project Description
- Construction of cofferdams and the removal of two existing 1800 diameter culverts passing through the Morris flood protection dike
- Installation of two 1800 corrugated metal pipes, connection to the existing flood control chamber and construction of new inlet and outlet structures complete with anti-seepage collars
- Reinstatement of the flood control dike prior to frost penetration
Key Challenges and Solutions
Challenges
- A staged 10m deep structural excavation through the Morris flood protection dike
- Bedding and compaction around the pipes to ensure proper support and reduce the likelihood of deformation and premature failure
- Construction of bentonite anti-seepage collars to prevent piping through the granular bedding
- Meeting the placement and compaction requirements for the clay dike material
Solutions
- Slope flattening and bank unloading and protection to minimize the risk of the adjacent dike slope failure during the excavation
- Careful placement and compaction of pipe bedding including density testing and constant pipe deflection measuring
- Continuous clay dike placement, compaction and testing to take advantage of good weather at the end of the construction season
