Education
Riverside Elementary Lateral Spreading Resistance Element Design
ENGEO Incorporated Project Location: San Pablo, California Project Start Date: 1 December 2020 Project Completion: 1 August 2021
Project Team: General Contractor/D/B Lead - Overra, Geotechnical Engineer/LSRE Designer - ENGEO, Architect - Gould Evans, Structural Engineer - Silas O’Brien, Civil Engineer - CSW|ST2, LRSE Contractor - Keller Project Background: ENGEO performed design services for the design-build construction of a mitigation of liquefaction-induced lateral spreading adjacent to a Bay Area elementary school. Overlapping deep soil mix (DSM) columns were constructed to create shear panels in the ground parallel to the direction of possible soil movement. ENGEO performed analyses to design the DSM panels as well as preparing the construction drawings and specifications in-house. The project schedule allowed for slightly more than five months to perform the design, achieve concurrence by the West Contra Costa Unified School District’s Geotechnical Engineer, and gain approval by the State of California in order to start construction in the School District’s required timeline. During construction, ENGEO performed part-time observations supporting the contractor’s Quality Control team and the Quality Assurance observations and testing by the School District’s team. The project was constructed in the summer of 2021, meeting the project’s tight schedule. Impact: The liquefaction and lateral spreading hazard was initially identified several years ago. The school had continued operations while the hazard was further evaluated and geotechnical reports were reviewed by DSA and CGS. Now that the project has been completed, the students who attend this elementary school and their families can rest assured that this hazard has been properly addressed. The LSRE was constructed as a series of subsurface shear panels oriented perpendicular to the creek adjacent to the school. The shear panels comprise four overlapping columns of DSM. Each DSM column is approximately 6 feet in diameter and ranges from 23 to 32 feet in depth. The columns are spaced approximately 25 feet on-center. In order to meet an extremely tight project timeline, the review process occurred while design calculations and construction documents were performed. Accomplishments & Accreditations: CalGeo Outstanding Project Awards - Medium-Public Category (Honorable Mention)
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