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Landslide Stabilization Using High Strength Aggregate-Cement Slurry
Most large landslides are repaired via some combination of mass grading, structural restraint systems, and/or dewatering. A deep-seated landslide occurred in Dana Point, California, in 2005 that resulted in the destruction of one home and the red-tagging of three others. Several attempts were undertaken to completely repair the landslide over a five-year period, but all attempts failed due to a lack of funds and concerns over landslide enlargement into adjacent properties. During preliminary design, a repair scheme was developed involving conventional grading and stabilization methods. To mitigate the potential for off-site landslide enlargement, an expensive caisson and tieback active restraint system needed to be integrated into the repair, along with a large toe surcharge and buttress for stability. However, this system resulted in the repair scheme being economically and logistically unviable. A unique repair scheme was then developed in conjunction with the contractor that utilized a high strength aggregate-cement slurry (ACS) keyway design in combination with a multi-faceted construction phasing scheme. The ACS consisted of a pourable mixture of aggregate rock, cement, and water. Construction phasing consisted of two phases: a global component and a keyway component. Design, construction methods, and testing will be discussed.
Landslide Stabilization Using High Strength Aggregate-Cement Slurry
Most large landslides are repaired via some combination of mass grading, structural restraint systems, and/or dewatering. A deep-seated landslide occurred in Dana Point, California, in 2005 that resulted in the destruction of one home and the red-tagging of three others. Several attempts were undertaken to completely repair the landslide over a five-year period, but all attempts failed due to a lack of funds and concerns over landslide enlargement into adjacent properties. During preliminary design, a repair scheme was developed involving conventional grading and stabilization methods. To mitigate the potential for off-site landslide enlargement, an expensive caisson and tieback active restraint system needed to be integrated into the repair, along with a large toe surcharge and buttress for stability. However, this system resulted in the repair scheme being economically and logistically unviable. A unique repair scheme was then developed in conjunction with the contractor that utilized a high strength aggregate-cement slurry (ACS) keyway design in combination with a multi-faceted construction phasing scheme. The ACS consisted of a pourable mixture of aggregate rock, cement, and water. Construction phasing consisted of two phases: a global component and a keyway component. Design, construction methods, and testing will be discussed.
Landslide Stabilization Using High Strength Aggregate-Cement Slurry
Silver, Gregory (author) / Bates, Lisa (author)
Geo-Congress 2013 ; 2013 ; San Diego, California, United States
Geo-Congress 2013 ; 1676-1689
2013-02-25
Conference paper
Electronic Resource
English
Landslide Stabilization Using High Strength Aggregate-Cement Slurry
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