Chapter
Apr 26, 2012
Base Resistance of Drilled Shafts in Fractured Rock
Publication: Art of Foundation Engineering Practice
Abstract
A method for estimating the nominal base resistance of drilled shafts in fractured rock based on uniaxial compressive strength and the Geological Strength Index (GSI) is presented and evaluated against a limited number of field load tests. The method is based on a bearing capacity model which is formulated in terms of the Hoek-Brown strength parameters, which are evaluated empirically through correlation to GSI and rock type. The method accounts for the effect of overburden stress, which is shown to increase in significance as the intact rock strength decreases. Comparison to a limited number of field load test results indicates this method provides a useful tool for estimating base resistance in rock mass that is appropriately characterized by GSI.
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© 2010 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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Professor, Civil & Architectural Engineering, University of Wyoming, Laramie, WY 82071; 307-766-4265.E-mail: [email protected]
Field Engineer, Kiewit Power Constructors Co., 7311 West 132nd St., Suite 300, Overland Park, KS 66213; 307-214-5159.E-mail: [email protected]
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