Download or read book Analysis of Laterally Loaded Drilled Shafts in Rock written by Ke Yang and published by . This book was released on 2006 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drilled shafts socketed into rock are widely used as foundations for bridges and other important structures. Rock-socketed drilled shafts are also used to stabilize a landslide. The main loads applied on the drilled shafts are axial compressive or uplift loads as well as lateral loads with accompanying moments. Although there exist several analysis and design methods especially for rock-socketed drilled shafts under lateral loading, these methods were developed with assumptions without actual validations with field load test results. Some of the methods have been found to provide unsafe designs when compared to recently available field test data. Therefore, there is a need to develop a more rational design approach for laterally loaded drilled shafts socketed in rock. A hyperbolic non-linear p-y criterion for rock is developed in this study that can be used in conjunction with existing computer programs, such as COM624P, LPILE, and FBPIER, to predict the deflection, moment, and shear responses of a shaft under the applied lateral loads. Considerations for the effects of joints and discontinuities on the rock mass modulus and strength are included in the p-y criterion. Evaluations based on comparisons between the predicted and measured responses of full-scale lateral load tests on fully instrumented drilled shafts have shown the applicability of the proposed p-y criterion and the associated methods for determining the required input of rock parameters. In addition to the development of a hyperbolic p-y criterion for rock, a method for predicting lateral capacities of drilled shafts in rock and/or soils is developed for assessing the safety margin of the designed shafts against the design loads. A computer program LCPILE is developed using VC++ to facilitate computations. An elastic solution based on a variational approach is also developed for determining drilled shaft elastic deflection due to applied lateral loads in a two-layer soil layer system. The computational algorithm was coded in a Mathematical file for easy application. Finally, Briaud's method for deriving p-y curves of rock from pressuremeter or dilatometer test results is evaluated using available field test data. A modification to the Briaud's method is recommended for applications in rocks.

Download or read book Drilled Shafts in Rock written by Lianyang Zhang and published by CRC Press. This book was released on 2004-05-15 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drilled shafts in rock are widely used as foundations of heavy structures such as highway bridges and tall buildings. Although much has been learned about the analysis and design of drilled shafts in rock, all the major findings are published in the form of reports and articles in technical journals and conference proceedings. This book i

Download or read book Drilled Shaft Manual Structural analysis and design for lateral loading by written by Lymon C. Reese and published by . This book was released on 1977 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drilled shafts have been used on a limited scale for many years as an alternative to driven piles in a variety of foundation problems. However, uncertainty about the behavior of the drilled shaft has forestalled widespread adoption. The subject package, by Dr. Lymon C. Reese of the University of Texas, is intended for use by bridge engineers, geotechnical engineers, and builders of pile foundations. The manual contains rational procedures and practical guidelines for the design and construction of drilled shaft foundations. Volume I presents a rational design procedure for drilled shafts under axial loading and includes guidelines on construction methods, inspection, load testing, specifications, and cost estimates. Volume II presents alternative methods for computing the response of the shaft to lateral loading and presents the structural design of the shaft for axial and/or lateral loading.

Download or read book Analysis of Axially and Laterally Loaded Rock socketed Drilled Shafts with Steel Casings written by Thomas G. Lewis and published by . This book was released on 1991 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book P y Curves for Laterally Loaded Drilled Shafts Embedded in Soft Weathered Rock written by and published by . This book was released on 2002 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Landslide Stabilization Using a Single Row of Rock socketed Drilled Shafts and Analysis of Laterally Loaded Drilled Shafts Using Shaft Deflection Data written by Mohammad M. Yamin and published by . This book was released on 2007 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: "An accurate and practical methodology for stability analysis and design of drilled shafts reinforced slopes was developed utilizing limiting equilibrium method of slices. Complex soil stratifications and general failure slip surfases can be handled in the developed method. The effect of soil arching due to the presence of the drilled shafts was accounted for by using a load transfer factor. The numerical values of the load transfer factor were developed based on 3-D FEM parametric study results. Many of the design variables controlling the slope/shaft systems, such: drilled shafts size, shafts location, shaft fixity (the necessary rock-socket length), and the required spacing between the drilled shafts to prevent soil from flowing around the shafts can be successfully determined from the developed method. The optimum location where the drilled shafts could be placed within the sliding soil mass so that the cost associated with the landslide repair using the drilled shafts is minimized can be searched for and determined from the developed methodology. From geotechnical point of view, the global factor of safety for slope/shaft systems can be determined. From structural point of view, the forces acting on the stabilizing drilled shafts due to the moving ground can be successfully estimated. In addition to the developed design methodology, Real-time instrumentation and monitoring were carried out for three landslide sites in the Southern part of Ohio. Various types of instruments were extensively installed inside the stabilizing shafts and the surrounding soils to monitor and better understand the behavior of slope/shaft systems. The UA Slope program developed by Dr. Robert Liang in cooperation with ODOT and FHWA has been used in designing these landslides. The field instrumentation and monitoring processes have provided excellent and unique information on the lateral responses of shafts undergoing slope movements. Also, the results of the instrumented cases have provided that the structural design (moments, shear, lateral deflection, and shaft tip fixity) of the shafts are overestimated (i.e., estimated forces acting on the shafts are high), and the geotechnical design (FS of slope/shaft system: movement and rate of movement) is achieved in two case studies but not fully achieved for the third case. On the other hand, in an effort to develop an efficient analytical method for analysis of laterally loaded drilled shafts using only lateral shaft deflection data, numerical procedures were proposed based on the principle of superposition. The lateral shaft deflections along the shaft length due to superposition of the lateral applied load to the drilled shaft were added together to establish the compatibility equations that govern the lateral behavior of the drilled shaft system. The compatibility equations allow for the determination of the net applied loads to the drilled shaft responsible for specific amount of shaft deflections. Once the loads were determined, basic equilibrium equations were applied to calculate shear forces and bending moments along the shaft length. A computer program was developed implementing the proposed numerical procedures to facilitate numerical computations. Many laterally loaded drilled shaft examples were described and used to verify the validity of the developed method. Included in the cases for validation were two actual full-scale drilled shafts at Jefferson County: (1) landslide repair using drilled shafts; and (2) lateral load test, were demonstrated."--Abstract.

Download or read book Design of Rock Socketed Drilled Shafts written by Jamal Nusairat and published by . This book was released on 2006 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project was aimed at evaluating and developing design methods for laterally loaded drilled shafts socketed in rock. Five lateral load tests on rock socketed drilled shafts with full range of instrumentation were conducted in Ohio. Detailed instrumentation included the use of vibrating wire strain gages, inclinometers, dial gages, and load cells. P-y curves representing site-specific lateral shaft-rock interaction were deduced from strain data. Field testing included the use of a borehole pressuremeter/dilatometer to obtain measurements that were correlated with rock mass strength and deformation parameters as well as with p-y curves. A comparison was made between the baseline p-y curves deduced from strain data of lateral load tests, the p-y curves predicted by using Reese's interim criterion, and the p-y curves from the pressuremeter tests in rock. A new hyperbolic p-y criterion for rock is proposed based on the field test data and extensive theoretical work. Validation of the proposed p-y criterion of rock was carried out by comparing the predictions of shaft deflections and bending moments using the hyperbolic p-y criterion against actual lateral load tests results. Based on the findings of this study, a complete solution for the design of drilled shafts socketed in rock or intermediate geomaterials under lateral loads is provided.

Download or read book Evaluation and Development of P y Based Procedures for Analysis of short Drilled Shafts Subjected to Lateral Loads written by Christopher Wayne Swan and published by . This book was released on 1986 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of theoretical studies performed to understand and be able to predict better the response of "short" drilled shafts. A "short" drilled shaft has been defined as a shaft which undergoes less than two points of zero deflection when subjected to lateral loads. The first portion of this study was directed towards developing simplified procedures for estimating when a drilled shaft would respond as a "short" shaft, taking into account at least approximately the nonlinear response of the soil. The second portion of this study was directed toward improving the present procedure for predicting the response of "short" drilled shafts. Several modifications were made to existing procedures based on "p-y" curves to improve their ability to predict the response of short drilled shafts. These modifications were incorporated into a computer program with other modifications, which are presented in a companion project report

Download or read book Piles in Weak Rock written by and published by Thomas Telford. This book was released on 1977 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of Laterally Loaded Long Or Intermediate Drilled Shafts of Small Or Large Diameter in Layered Soils i e Soil written by Mohamed A. Ashour and published by . This book was released on 2004 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study has extended the capability of the SW model in order to predict the response of laterally loaded large diameter shafts considering 1) the influence of shaft type on the lateral shaft response; 2) the nonlinear behavior of shaft material and its effect on the soil-shaft interaction; 3) developing liquefaction in the surrounding soil profile based on far and near-field induced water pressure; and 4) vertical side shear resistance along the shaft wall that has a significant contribution to the lateral shaft response

Download or read book Drilled Shaft Design and Construction Guidelines Manual Reese L C and Allen J D Structural analysis and design for lateral loading written by Lymon C. Reese and published by . This book was released on 1977 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lateral Load Capacity of Drilled Shafts in Jointed Rock written by Albert Chi Fu To and published by . This book was released on 1999 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Verification and Calibration of the Design Methods for Rock Socketed Drilled Shafts for Lateral Loads written by Jamal Nusairat and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This project was aimed at: (1) evaluating and developing design methods for laterally loaded drilled shafts socketed in anisotropic rock, (2) Develop a p-y criterion that can be used to analyze the response of drilled shaft socketed into transversely isotropic rock or jointed rock, (3) Develop a new methodology for determining the five elastic constants of a transversely isotropic rock medium using the in-situ pressuremeter test device, (4) Develop a new equation for estimating the transverse isotropic rock shear modulus, (G') using other elastic constants. (5) Develop a new methodology to obtain a p-y criterion using in-situ pressuremeter technique that can be used to analyze the response of drilled shaft socketed into transversely isotropic rock. The hyperbolic p-y criterion for rock proposed in SJN 134137 based on the field test data and extensive theoretical work was further validated using additional load test data. Validation of the proposed p-y criterion of rock was carried out by comparing the predictions of shaft deflections and bending moments using the hyperbolic p-y criterion against actual lateral load tests results. Based on the findings of this study, a complete solution for the design of drilled shafts socketed in anisotropic rock or intermediate geomaterials under lateral loads is provided.

Download or read book Analysis of Laterally Loaded Long Or Intermediate Drilled Shafts of Small Or Large Diameter in Layered Soil written by Mohamed Ashour and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Study of Undrained Lateral and Moment Behavior of Drilled Shafts During Static and Cyclic Loading written by P. W. Mayne and published by . This book was released on 1992 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Construction and Analysis of a Laterally loaded Drilled Shaft written by John N. Cunningham and published by . This book was released on 1984 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pressuremeter Applications in Laterally Loaded Drilled Shaft Socketed Into Transversely Isotropic Rock written by Abdulla Ahmad Sharo and published by . This book was released on 2009 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Rock mass often exhibits transversely isotropic stress strain behavior due to the inherent mineral grain orientation and the presence of bedding planes of parallel sets of joints. Recognizing this important aspect of rock behavior, there has been a significant amount of research efforts in the past to develop pertinent methods for determining the relevant elastic properties that can be used to characterize the anisotropic rock mass behavior. However, after a careful review of literature, it appears that only recently that a few researchers have devoted their research attention to the proper analysis method for analyzing the laterally loaded drilled shafts socketed in a rock mass that exhibits transversely isotropic elastic behavior. There are five required independent elastic constants in order to completely characterize the transversely isotropic elastic behavior. These five independent elastic constants are: Ev is the Young's modulus in the vertical direction to the isotropic plane; Eh is the Young's modulus in the horizontal direction to the isotropic plane; vvh is Poisson's ratio for horizontal strain due to imposed vertical strain; vhv is Poisson's ratio for vertical strain due to horizontal strain; Gvh is the shear modulus in the vertical plane. The research work develops a methodology to use the pressuremeter test to extract the relevant elastic constants for transversely isotropic rock. A series of systematic parametric analysis using the ABAQUS finite element program is carried out from which a method was developed for interpreting five elastic constants of transversely isotropic rock mass using pressuremeter test data. A comprehensive database of experimentally determined five independent elastic constants for the transversely isotropic rocks from literature review was presented in this research. Also, possible statistical cross correlations among the theoretically independent elastic constants were statistically examined. Empirical equations for estimating the shear modulus of a transversely isotropic rock G', by using other elastic constants were developed. A new methodology to deduce hyperbolically shaped p-y curves of transversely isotropic rock from pressuremeter test was developed in this study through extensive theoretical and numerical simulation works. The method was validated by four case studies involving both actual full-scale lateral load test data and pressuremeter test data at the test site as well as hypothetical numerical simulation cases."--Abstract.