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Author: Lianyang Zhang Publisher: CRC Press ISBN: 1135290164 Category : Technology & Engineering Languages : en Pages : 396
Book Description
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
Author: Lianyang Zhang Publisher: CRC Press ISBN: 1135290164 Category : Technology & Engineering Languages : en Pages : 396
Book Description
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
Author: Lianyang Zhang Publisher: CRC Press ISBN: 0203024427 Category : Technology & Engineering Languages : en Pages : 398
Book Description
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
Author: National Highway Institute (U.S.) Publisher: ISBN: Category : Earthwork Languages : en Pages : 608
Book Description
This document was written as a resource for participants in a short course covering the topic of construction and design of drilled shaft foundations for bridges and other structures. It is the second edition of a Federal Highway Administration workbook on construction and design of drilled shafts. The first edition was written in 1988 (FHWA-SA-HI-88-042). While introductory material from the 1988 edition was retained, the emphasis in this document is on providing relatively comprehensive information for engineers who already have some experience with drilled shaft construction and/or design. The initial chapters cover an overview of the characteristics of drilled shafts, site investigations for drilled shafts (to collect information for both construction and design), and details of drilled shaft construction. These chapters are followed by several chapters on the design of drilled shafts in soil and rock for both axial and lateral loading, with examples. Both allowable stress design and load and resistance factor design principles are addressed. Details of design calculations procedures are provided in the appendices.
Author: Ke Yang Publisher: ISBN: Category : Lateral loads Languages : en Pages : 536
Book Description
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.
Author: Jamal Nusairat Publisher: ISBN: Category : Bridges Languages : en Pages : 422
Book Description
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.
Author: Stetson B. Ramey Publisher: ISBN: 9781109532708 Category : Boring Languages : en Pages : 49
Book Description
A method is presented to calculate the nominal base resistance of a drilled shaft socketed into a fractured rock mass by using the Hoek-Brown strength criterion and its input parameter the Geological Strength Index (GSI). Base resistance is sometimes neglected when designing drilled shafts embedded in fractured rock masses resulting in large diameter shafts because the entire load is designed to be resisted through side shear. While a fractured rock mass will not have as much bearing capacity as an intact rock mass, usually even a fractured rock mass is able to resist a significant portion of the applied load. Data from load tests on drilled shafts embedded into various types of rock are compared to the theoretical relationship between the GSI and nominal base resistance. The data were all from sources where the drilled shaft was loaded to failure in end bearing and the nominal bearing resistance had been determined. The sources also include necessary rock mass properties. One case was analyzed with the intent of comparing the actual load test data against the theoretical relationship proposed, so rock core boring was taken with the intent of determining a value for the GSI. This data point matches up extremely well with the theoretical relationship. For the other thirteen data points, a value of GSI was estimated from detailed descriptions of the rock mass found in the geotechnical report and boring logs or GSI was correlated to another rock mass rating system. In these cases, the theoretical relationship appears to yield a lower bound to rock socket base resistance. By comparing actual data to the theoretical relationship presented in this thesis, it is determined that the method is a useful tool to estimate the bearing capacity of a rock mass.
Author: Lianyang Zhang
Author: Lianyang Zhang
Author: Lianyang Zhang
Author: National Highway Institute (U.S.)
Author: Michael W. O'Neill
Author: Ke Yang
Author: Jamal Nusairat
Author: 
Author: Lymon C. Reese
Author: Stetson B. Ramey
Author: Moon S. Nam