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CONFIRMATION OF SUBSURFACE GEOLOGIC CONDITIONS OF THE UC BERKELEY STANLEY HALL REPLACEMENT PROJECT BY
CONSTRUCTION FIELD OBSERVATIONS
Presented by:William Godwin CEG, Ryan Shafer PE, and Chris Muller GE
MACTEC Engineering & Consulting, Inc.
Annual MeetingThe Geological Society of America
Seattle, Washington
November 2, 2003
Introduction
Purpose of Paper:Discuss the importance of geologic
mapping of large excavations that expose heterogenous materialsPresent engineering geologic
conditions of the project
Topics
Project Description Challenges Geotechnical Investigation Geologic Conditions Construction Methodology Geologic Mapping Conclusions
Key ElementsReplacement of existing
classroom buildingAccommodate 3 basement
levels to -75 feetSeismic design to
withstand Mmax 7.1 on Hayward Fault 500 feet away
Project Description
Team UCB Capital Projects – Owner/Builder Zimmer Gunsul Frasca Partnership –
Architect BKF Engineers/Surveyors/Planners –
Civil Engineer MACTEC E&C – Geotechnical Engineer Rutherford & Chekene – Structural Engineer Pirooz Baraar Associates – Retention
Systems Engineer McCarthy – General Contractor
Project Description
Geotechnical Investigation
Program Previous Investigations Deep coreholes Laboratory testing Geophysical surface surveys
Recommendations Stability Excavatability Dewatering Shoring design criteria
Geotechnical Investigation
Geologic Conditions
Geologic Units and Structure Fill and Alluvium Greywacke Sandstone Shale and Mudstone Breccia Serpentinite and Melange Louderback Shear Zone
Geologic Mapping
Digital photography Sequential face mapping Seepage and overbreak Geologic contacts
Geologic Mapping
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ELEVATIONIN FEET
SOUTH WALL ELEVATION
Geologic Mapping
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S O U T H W A L L
DONNER LAB
GRAYWACKESANDSTONE
BRECCIATED
MUDSTONE
AND SHALE
INTERBEDDEDSANDSTONE AND SHALE
CARBONACEOUS
SHEARED AND
SERPENTINITE
SHALE WITH
Site Geology
Conclusions
Conditions: Interpreted vs. Actual– Bedrock contacts– Excavatability– Stability– Groundwater– Bonding strength– Wall movement