Bentonite-water slurry rheology and cutoff wall trench stability
Conference
·
OSTI ID:567790
- Virginia Tech, Blacksburg, VA (United States)
- Langan Engineering and Environmental Services, Elmwood Park, NJ (United States)
- Woodward-Clyde Consultants, Denver, CO (United States)
The rheological behavior of bentonite-water slurry is responsible for its ability to stabilize trenches that are made for construction of subsurface barriers to ground water flow. This paper reviews the rheology of bentonite-water slurries and presents property values for a range of bentonite concentrations. Test results indicate that, if the D{sub 15} size of the native ground is less than 0.4 mm, it is likely that a bentonite filter cake will form on the face of an excavation supported by bentonite-water slurry. For soils that are too coarse for a filter cake to form, it was found that the penetration distance of slurry into the soil increases as the D{sub 5} size and void ratio of the soil increase. An expression for the factor of safety against local sloughing failure of the trench wall is presented. Local sloughing failures that occurred during construction of the cutoff wall at Island Copper Mine, Vancouver Island, BC, are discussed, and calculated factors of safety are in good agreement with the observed performance.
- OSTI ID:
- 567790
- Report Number(s):
- CONF-971032--; CNN: Grant CMS-9502448
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of acidic leachate on material degradation of slurry trench cutoff walls
Slurry walls and slurry trenches - construction quality control
Soil-bentonite design mix for slurry cutoff walls used as containment barriers
Conference
·
Tue Dec 30 23:00:00 EST 1997
·
OSTI ID:576484
Slurry walls and slurry trenches - construction quality control
Conference
·
Tue Dec 30 23:00:00 EST 1997
·
OSTI ID:576477
Soil-bentonite design mix for slurry cutoff walls used as containment barriers
Conference
·
Sat Dec 30 23:00:00 EST 1995
·
OSTI ID:419585