Landslide Stabilization Using A Single Row Of Rock Socketed Drilled Shafts And Analysis Of Laterally Loaded Drilled Shafts Using Shaft Deflection Data
DOWNLOAD
Download Landslide Stabilization Using A Single Row Of Rock Socketed Drilled Shafts And Analysis Of Laterally Loaded Drilled Shafts Using Shaft Deflection Data PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Landslide Stabilization Using A Single Row Of Rock Socketed Drilled Shafts And Analysis Of Laterally Loaded Drilled Shafts Using Shaft Deflection Data book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Landslide Stabilization Using A Single Row Of Rock Socketed Drilled Shafts And Analysis Of Laterally Loaded Drilled Shafts Using Shaft Deflection Data
DOWNLOAD
Author : Mohammad M. Yamin
language : en
Publisher:
Release Date : 2007
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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Landslides categories.
"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.
Analysis Of Laterally Loaded Drilled Shafts In Rock
DOWNLOAD
Author : Ke Yang
language : en
Publisher:
Release Date : 2006
Analysis Of Laterally Loaded Drilled Shafts In Rock written by Ke Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Lateral loads categories.
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.
Field Instrumentation Monitoring Of Drilled Shafts For Landslide Stabilization And Development Of Pertinent Design Method
DOWNLOAD
Author : Robert Y. Liang
language : en
Publisher:
Release Date : 2010
Field Instrumentation Monitoring Of Drilled Shafts For Landslide Stabilization And Development Of Pertinent Design Method written by Robert Y. Liang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Landslides categories.
The design method for using a single row, spaced drilled shafts, socketed into a firm rock strata, to stabilize an unstable slope has been developed in this research. The soil arching due to the presence of spaced drilled shafts in a slope was observed in 3-dimensional finite element simulations and field monitoring data. A comprehensive 3-D finite element parametric study was used to derive an empirical equation to quantify the arching induced load transfer. A limiting equilibrium based slope stability analysis method, incorporating the arching effect, was developed and coded into a PC based program UA SLOPE 2.1, to allow for analysis of the factor of safety of the shaft/slope system and the earth thrust on the drilled shaft. The developed analysis and design method was validated based on more than 40 cases of 3-dimensional finite element simulations, covering a wide range of slope geometry, soil strength parameters, and the drilled shaft diameter, spacing, and location conditions. Three slope stabilization projects in Ohio involving the use of drilled shafts were monitored with instrumentations to obtain a 3-year performance data of the stabilized slope and to validate the design based on the developed method. In addition, a field testing program at the ATH-124 Project site was conducted to quantify arching during several stages of surcharge load induced slope movements. The developed UA SLOPE 2.1 program was verified by comparisons with the calibrated finite element simulation results of this field surcharge loading condition. The UA SLOPE 2.1 program is recommended for use in finding an optimized design (i.e., location, diameter, and spacing) of the drilled shafts to stabilize an unstable slope.
Dissertation Abstracts International
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2008
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Dissertations, Academic categories.
Landslide Stabilization Using Drilled Shafts In Static And Dynamic Conditions
DOWNLOAD
Author : Arash Erfani Joorabchi
language : en
Publisher:
Release Date : 2011
Landslide Stabilization Using Drilled Shafts In Static And Dynamic Conditions written by Arash Erfani Joorabchi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Boring categories.
One of the most common ways to stabilize the slope is to use the row of drilled shaft. The goal of this investigation is to introduce applicable methodology to calculate the factors of safety and force, on the shaft, in the static condition. By using the limit equilibrium approach accompanied with the concept of arching, due to incorporating the drilled shaft, the safety and force can be calculated. The 3-dimensional finite element parametric study is used to derive the regression based semi-empirical equations for quantifying the arching effect, through the load transfer factor. A computer program is written to incorporate the algorithms mentioned above for applications to real cases. The results of the proposed methodology are validated by the three dimension finite element analysis. Furthermore, seismic displacement of the slope, reinforced with a row of the drilled shafts, is calculated using modified displacement based method. This procedure is the extension work of seismic slope stability analysis presented by Bray and Rathje (1998) and Screen analysis presented by Stewart and Blake (2003). In this procedure, dynamic resistance of the drilled shaft/slope system is calculated in framework of limit equilibrium analysis accompanied with the arching due to incorporating the drilled shaft. To quantify the arching, the critical displacement is selected. First, the variation of arching as a function of displacement is studied. Then for critical displacement that causes the maximum force on the shaft and maximum displacement, the arching is quantified and applied to the limit equilibrium analysis. To address the geotechnical and structural issues, the performance based design is proposed to calculate the factor of safety of the drilled shaft slope system and the force on the drilled shafts based on an acceptable displacement. The results of seismic displacement, the factor of safety of slope shaft system, and the maximum induced force on the drilled shaft are validated by 3-dimensional Finite element analysis.
Design Of Rock Socketed Drilled Shafts
DOWNLOAD
Author : Jamal Nusairat
language : en
Publisher:
Release Date : 2006
Design Of Rock Socketed Drilled Shafts written by Jamal Nusairat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Bridges categories.
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.
Verification And Calibration Of The Design Methods For Rock Socketed Drilled Shafts For Lateral Loads
DOWNLOAD
Author : Jamal Nusairat
language : en
Publisher:
Release Date : 2011
Verification And Calibration Of The Design Methods For Rock Socketed Drilled Shafts For Lateral Loads written by Jamal Nusairat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Rock excavation categories.
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.
Development Of Design And Analysis Method For Slope Stabilization Using Drilled Shafts
DOWNLOAD
Author : Wassel Al Bodour
language : en
Publisher:
Release Date : 2010
Development Of Design And Analysis Method For Slope Stabilization Using Drilled Shafts written by Wassel Al Bodour and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Civil engineering categories.
"A 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 surfaces 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 locations, and the required spacing between the drilled shafts can be successfully determined from the developed method. The optimum location can be searched for and determined from the developed methodology. The global factor of safety for slope/shaft systems and the forces acting on the stabilizing drilled shafts due to the moving ground can be successfully estimated. For the purpose of verifying the validity of the proposed design methodology, the results of a field load testing program on the fully instrumented drilled shafts installed on an existing failed slope together with the companion 3-D FEM simulations are presented. This real case was analyzed using the proposed analysis and design methodology, the analysis results were compared with the FEM results, and it is found that they are in good agreement. In addition, 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 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."--Abstract.
Drilled Shafts
DOWNLOAD
Author : Michael W. O'Neill
language : en
Publisher:
Release Date : 1999
Drilled Shafts written by Michael W. O'Neill and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Foundations categories.
Analysis Of Laterally Loaded Long Or Intermediate Drilled Shafts Of Small Or Large Diameter In Layered Soils I E Soil
DOWNLOAD
Author : Mohamed A. Ashour
language : en
Publisher:
Release Date : 2004
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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Lateral loads categories.
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