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• W23275525 abstract "In areas of weathered and decomposed profiles, the definition of soil parameters needed for the analysis and design of laterally loaded drilled shafts poses a great challenge. The lack of an acceptable analysis procedure is compounded by the unavailability of a means for evaluating the weathered profile properties, including the lateral subgrade modulus, which often leads to the conservative design. Results from this research revealed that currently proposed P-y approaches to design drilled shafts embedded in weathered Piedmont profiles do not provide reasonable estimates of load-deflection response. Results in this report are used to develop and validate a procedure for the analysis of laterally loaded drilled shafts embedded in a weathered mass. The developed procedure is based on the P-y method of analysis in which the shape and magnitude of the P-y function are defined. The research proceeded along four complementary tracks: i) Finite Element modeling, ii) Laboratory work, iii) Field testing using full scale shafts; field work also included estimation of in situ modulus of subgrade reaction using rock dilatometer, and finally iv) Performance predictions. The proposed P-y curves are developed as hyperbolic functions. A method to evaluate in situ stiffness properties of the weathered by utilization of the dilatometer, as well as by using geologic information of joint conditions, Rock Quality Designation (RQD), and the strength properties of cored samples, is proposed. A computational scheme for lateral behavior is advanced by which different lateral subgrade responses are assigned in the model based on the location of the point of rotation. Above the point of rotation, a coefficient of lateral subgrade reaction is assigned on the basis of evaluated modulus as computed from dilatometer data or from index geologic properties. A stiffer lateral subgrade reaction is assigned below the point of rotation in order to model the relatively small shear strains in this region. Predictions based on the proposed P-y model for weathered show good agreement with field test results, which were performed in various profiles. The proposed method is also verified by comparisons with published results of an additional field test. Concepts of the proposed weathered model have been encoded into the computer program LTBASE." @default.
• W23275525 created "2016-06-24" @default.
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• W23275525 date "2002-12-01" @default.
• W23275525 modified "2023-09-27" @default.
• W23275525 title "P-y Curves for Laterally Loaded Drilled Shafts Embedded in Weathered Rock" @default.
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