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原文传递 Colorado's Axial Load Tests on Drilled Shafts Socketed in Weak Rocks: Synthesis and Future Needs.

题名：	Colorado's Axial Load Tests on Drilled Shafts Socketed in Weak Rocks: Synthesis and Future Needs.
作者：	ABU-HEJLEH, N.; ATTWOOLL, W. J.
关键词：	Drilled-shafts; Axial-loads; *Colorado-.;Foundations-Structures; Bridges-Structures; Geotechnical-engineering; Shafts-Excavations; Rock-mechanics; Load-tests; Strength-Mechanics; Design-methods; Geology-; Construction-; Data-collection.
摘要：	Drilled shaft foundations embedded in weak sedimentary rock formations (shale bedrocks) support a significant portion of bridges in Colorado. Since the 1960s, empirical design methods based on the blow counts of the standard penetration test (SPT) have been used to design drilled shafts in Colorado that deviate from the AASHTO LRFD design methods. The most accurate design method is to conduct load tests on test shafts, which are very expensive to perform. CDOT's strategic objective is to identify the most appropriate LRFD geotechnical axial design methods for Colorado's drilled shafts socketed in weak rocks that use test data obtained from cheaper and simpler geotechnical tests. To fulfill this objective, the measured resistance and settlement results of an adequate number of load tests on drilled shafts socketed in Colorado's shale bedrocks should be obtained and compared with predictions from design methods that use data of simpler geotechnical tests on the same bedrocks. In this report, Colorado's typical geological formations and construction methods for drilled shaft foundations are documented and discussed. Available information on Colorado's past axial load tests performed in the last 35 years on drilled shafts socketed in shale bedrocks are documented.
报告类型：	科技报告