Target Reliability Based Design of Foundations on Jointed Rock Masses with Two Sets of Discontinuities

Basha, B Munwar and Chandrakanth, K. and Baig Moghal, Arif Ali and et al, . (2021) Target Reliability Based Design of Foundations on Jointed Rock Masses with Two Sets of Discontinuities. In: 2021 International Foundations Congress and Equipment Expo: Installation, Testing, and Analysis of Deep Foundations, IFCEE 2021, 10 May 2021through 14 May 2021, Dallas.

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Jointed rock mass is inherently heterogeneous because of the presence of discontinuities. The discontinuities may occur in the form of joints, faults, and fissures. The variability of engineering properties of jointed rock mass depends on geometrical shapes due to past geological processes. The spatial arrangement, surface roughness, number, length, orientation, and inter-connectivity of discontinuities may play a significant role in an accurate prediction of jointed rock mass strength. The jointed rock mass strength is pivotal for the safe and economical design of strip foundations in rock engineering. The reliability method used in this work provides a more rational approach over the conventional factor of safety approach by accounting for the variability of properties of the jointed rock mass. A reliability based optimization of foundations built on jointed rocks with two discontinuity sets is presented to compute the optimum value of the allowable bearing capacity of strip footings. The discontinuity strength model along with the modified Bell approach is adopted to determine the ultimate bearing capacity. Reliability analysis is conducted by treating uniaxial compressive strength of intact rock, discontinuity cohesion, discontinuity orientation, joint spacing, rock material frictional angle, and discontinuity frictional angle as random variables. The effects of orientation on the allowable bearing capacity are presented for the target probability of failure of 0.13%. © ASCE.

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Basha, B Munwar
Item Type: Conference or Workshop Item (Paper)
Additional Information: The experimental investigation of drilled shafts was supported by the Oregon Department of Transportation through Grant SPR 765 and from the Pacific Northwest Transportation Consortium (PacTrans) through grant DTRT12 -UTC10. The ADSC esW t Coast Chapter CC(W ) contributed funds to help offset material costs associated with the construction of the test shafts, with critical coordination efforts and guidance provided by John Starcevich (Ma lcolm Drilling, Inc.), Becky Patterson CC(W ), and Rick alW sh (Hayward Baker, Inc.). Significant in-kind contributions were provided by the following firms and their employees: Malcolm Drilling, Pacific Foundation, 5DOSK¶V &RQFUHW,H ConTech Systems, 3-¶V a5rH, Nucor Skyline , ilW liams Form Engineering, Foundation Technologies, GEI Consultants, and Pile Dynamics. The experimental investigation of the driven pipe piles was funded by the California Department of Transportation (CalTrans), Contract 59A064. The s upport of the many agencies, firms, and individuals is gratefully appreciated.
Uncontrolled Keywords: Allowable bearing capacity; Engineering properties; Probability of failure; Reliability based optimization; Reliability methods; Spatial arrangements; Ultimate bearing capacity; Uniaxial compressive strength
Subjects: Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 03 Oct 2022 15:04
Last Modified: 03 Oct 2022 15:04
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