Southwestern United States
Retaining Wall Failure Investigation
Scope/Solutions
Shortly after the site was developed, a terraced, mechanically stabilized earth (MSE) wall failed. The MSE wall, with heights up to 63 ft tall, consisted of precast concrete facing panels and soil backfill interlayered with geogrid reinforcement. SGH investigated the failures’ causes and assisted the owner in evaluating repair options.
Highlights of our investigation include the following:
- Reviewed design and construction documents, manufacturer’s literature, reference standards, building codes, and expert reports
- Visited the site to document post-failure conditions
- Developed and implemented field and laboratory investigations, including locating and making observations at test pits, detecting leaks in adjacent pressurized water-bearing utilities, and testing soils in the area
- Performed a microscopic examination of a failed 2 in. dia. buried polyvinyl chloride irrigation line in our laboratory
- Assessed the effects of soil type, relative compaction, moisture content, and shear strength on the wall failures
- Analyzed the stability of the as-designed and as-built wall configuration
- Developed a detailed sequence of events, including construction activities and weather to help identify factors contributing to the failures
- Evaluated repair options for the MSE wall and provided recommendations for buried utility repairs
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Project Summary
2013
Completion Date
Solutions
Failure Investigation
Services
Structures | Advanced Analysis | Applied Science & Research
Markets
Commercial
Specialized Capabilities
Repair & Strengthening | Geotechnical | Failure Analysis | Microscopy
Key team members
Additional Projects
West
140 New Montgomery Street
Completed in the mid-1920s, 140 New Montgomery Street is one of the early skyscrapers built in San Francisco. SGH consulted on the exterior waterproofing and restoration of the facade, which is primarily clad with glazed terra-cotta.
West
1400 and 1450 Bayhill
The YouTube Campus Expansion project at 1400 and 1450 Bayhill Drive includes construction of two new mass timber office buildings. SGH served as the project's designer of record for the roofing and waterproofing systems and the concrete block cavity wall cladding around the base of the buildings.