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Slurry Wall


Manitoba, Canada: Cement-Bentonite Slurry Wall Installation, Phase III Dam Raises - Railway Dam Phase 1

levee-slurry-wall-thompson-manitoba

This project was a pilot test to determine the constructability of a cement-bentonite (CB) slurry wall through a slag overburden. A railway dam was constructed to support a planned raise in the water level in Vale's tailings basin. The dam was constructed using two rock filled berms spaced approximately 120 feet apart and the area between was filled with slag. A trial cutoff wall was constructed through the slag and tied into the underlying clay stratum using the conventional slurry trenching technique. The cutoff wall was constructed in a rectangle (30feet x 16feet) to create an enclosed area. Once the cutoff wall was installed, the water level inside was pumped out. The water levels inside and outside the wall were monitored to observe any variations to determine if the cutoff wall was working properly. For the construction effort, Geo-Solutions provided technical assistance services and worked alongside Geopac Inc. (Geopac) to install the cutoff wall. The technical assistance services included a slurry specialist, Quality Control technician, and specialty equipment. Geo-Solutions' specialty equipment included; a custom long stick attachment to fit a Komatsu PC 400, cement-bentonite batch plant, bentonite slurry mix plant and associated pumps. Geopac provided all other labor and equipment to construct the cutoff wall. The CB slurry wall exceeded the expectations of the 28-day strength (unconfined compressive strength) of 30psi and met the permeability requirements in the 10-6 cm/sec range. The project was completed with zero incidents, on time and within budget.



 
   

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