Chase Center: Excavation Bottom Stabilization (ASCE Dinner Meeting)
Please join us on Thursday, March 19, 2020 at the Sir Francis Drake Hotel in San Francisco for this month's meeting. Patrick Morrison, PG, CEG of Smith-Emery will present on the challenges and methods of construction on bay mud to build the Chase Center. This event is co-hosted by the Structural Engineering Institute of ASCE, the ASCE Golden Gate Branch, and the Construction Institute of ASCE, all of the San Francisco Section.
This event is part two of a two-part mini-series of the Chase Center co-hosted by our three organizations. The first event is scheduled for February 20, 2020 and focuses on design and construction issues. Click here for details on the first event. The rest of this announcement pertains to part two - excavation bottom stabilization.
Presentation: Smith-Emery evaluated the soil bearing capacity for the crawler cranes to be used in the basement excavation at the referenced site. Recommendations were made for stabilizing the excavation bottom for various anticipated soil conditions and temporary crane loading of 4,500 psf and 6,000 psf. For this evaluation we reviewed the project geotechnical report, advanced exploratory borings, collected bulk and undisturbed soil samples, performed laboratory testing on the samples combined with varying percentages of cement and lime, performed field plate load tests on cement and lime treated soils, and evaluated the soil bearing capacity relative to planned loading from the use of track mounted cranes at the site.
The boundaries of the various soil conditions relative to the basement subgrade were defined by exploratory borings and excavations performed under the observation and logging of a Smith-Emery geologist. Seven different combinations of loading and existing soil profile conditions were identified and evaluated. Depending on the soil profile and planned loading conditions, recommendations ranged from cement treatment of existing granular fill over Bay Mud to lime treatment of Bay Mud over stabilization fabric over in-place Bay Mud.
Location: Sir Francis Drake Hotel - Empire Ballroom, 450 Powell St, San Francisco, CA 94102
Networking: 5:30-6:00 pm
Dinner and Presentation: 6:00-8:30 pm
Speaker:
Patrick Morrison, PG, CEG:Mr. Morrison is a California Certified Engineering Geologist. He has over 32 years of professional experience in special inspection, material testing, rail construction, geotechnical engineering and environmental fields and 30 years working at Smith-Emery. Mr. Morrison is responsible for management of Smith-Emery San Francisco’s GeoServices Division with a staff of 20 soils inspectors and geotechnical/environmental professionals. Project responsibilities encompass management for geotechnical and environmental investigations and consulting on a wide range of projects from single family residential to major infrastructure projects. He is involved with and oversees geotechnical exploration and report preparation, environmental site characterizations, fault hazard studies, seismic design parameter recommendations, slope stability analysis, geologic mapping, as well as foundation and grading/paving recommendations. Mr. Morrison is also active in project oversight for earthwork and paving inspection and testing, as well as special inspections on projects throughout California, review of field and laboratory data for conformance to project specifications, and presentation and communication of data to clients and regulatory agencies.