Landslide Stabilization Using Drilled Shafts In Static And Dynamic Conditions
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Landslide Stabilization Using Drilled Shafts In Static And Dynamic Conditions
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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.
Field Instrumentation Monitoring Of Drilled Shafts For Landslide Stabilization And Development Of Pertinent Design Method
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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.
Landslide Stabilization Using A Single Row Of Rock Socketed Drilled Shafts And Analysis Of Laterally Loaded Drilled Shafts Using Shaft Deflection Data
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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.
Development Of Design And Analysis Method For Slope Stabilization Using Drilled Shafts
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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.
Reliability Based Design For Slope Stabilization Using Drilled Shafts And Anchors
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Author : Lin Li
language : en
Publisher:
Release Date : 2014
Reliability Based Design For Slope Stabilization Using Drilled Shafts And Anchors written by Lin Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Civil engineering categories.
Landslides and slope failures occur frequently every year to have major impact on the operational safety of roadways and to add financial burden to the highway agencies for slope repairs and maintenance. In this dissertation, a reliability-based computational algorithm is developed for design of a row of equally spaced drilled shafts and/or anchors to stabilize an unstable slope while achieving the required target reliability index with minimum volume of drilled shafts. The Monte Carlo simulation (MCS) technique is used in the previously developed deterministic computational program, in which the limiting equilibrium method of slices is modified to incorporate the arching effects of the drilled shafts in a slope. Uncertainties of soil parameters in the slope are considered by statistical descriptors, including mean, c.o.v., and distribution function. Model errors of the semi-empirical predictive equation for the load transfer factor for characterizing the soil arching effects are considered by statistics of bias. A PC-based program has been developed based on the above methodology. In order to dealing with small probability events in the drilled shaft/slope system and reduce the large number of MCS calculations, a more advanced methodology, importance sampling technique (IST), is proposed to determine the probability of failure and the reliability index of a drilled shaft/slope system. The performance function and the design point are determined by the ordinary method of slices (OMS) with the accompanying load transfer factor. To permit system reliability analysis for an anchor/slope system considering the effects of stochastic corrosion, the Monte Carlo simulation technique is used in conjunction with the modified limiting equilibrium method of slices. Meanwhile, the time-dependent deterioration of bond capacity of corroding soil anchors is developed in this methodology due to the attack of chlorides. The importance of using a system reliability-based computational method is illustrated by showing that the anchor/slope system may fail unpredictably during design life--even though the initial design results have a high degree of safety--if uncertainties of soil parameters, anchor force, and the time-dependent stochastic corrosion process are not accounted for systematically. In order to preventing a large earth thrust applied to the drilled shafts due to the dimensions of the failed slope, the use of multiple rows of drilled shafts could be a feasible solution to both ensure that the global factor of safety of the stabilized slope meets the target factor of safety and the amount of reinforcement used in the drilled shafts is constructible and economical. A limiting equilibrium based methodology, incorporating the method of slices and arching effects of the drilled shafts, is developed for optimizing the use of multiple rows of drilled shafts. It is shown that as compared to one row of drilled shafts, multiple rows of drilled shafts can effectively increase the global factor of safety and at the same time reduce the net force imparted on the shaft, thus making the reinforcement design more constructible and meeting the service limit.
Geotechnical Engineering Applied Soil Mechanics And Foundation Engineering Volume 2
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Author : Cyrus Aryani
language : en
Publisher:
Release Date : 2020
Geotechnical Engineering Applied Soil Mechanics And Foundation Engineering Volume 2 written by Cyrus Aryani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Finite element method categories.
The five-volume book series delivers a comprehensive coverage of topics in geotechnical engineering practice. The unique design of the text allows the user to look up a topic of interest and be able to find, in most cases, the related information all on the same sheet with related figures and tables, eliminating the need for figure and table referral numbers. In a way, each page is a capsule of information on its own, yet, related to the subject covered in that chapter. The topics covered in all five volumes will assist the reader with becoming a licensed professional engineer (PE) and a licensed geotechnical engineer (GE). Volume 2 contains chapters 8 through 11, which provides the user with a practical guide on the fundamentals of soil mechanics and foundation engineering, including: Lateral Earth Pressures (at-rest case, active case, passive case, Rankine's and Coulomb's methods, Culmann's graphical method, different site and surface loading conditions, ...) and Retaining Structures (different types of retaining walls and braced cuts, stability analysis, backfill and subdrain systems, ...), Stability of Slopes (natural and man-made slopes, modes of failure, methods of analysis, landslide stabilization methods, hillside grading and land development, erosion control, ...), Shallow Foundations (types of shallow foundations, methods of bearing capacity evaluation for a variety of site, groundwater, and loading conditions, settlement analysis, ...), and Deep Foundations (installation of piles, construction of drilled shafts, load capacity of piles and drilled shafts, static and dynamic testing, integrity testing of piles, cross-hole sonic logging and thermal integrity profiling for drilled shafts, ...). Example problems follow the topic they cover. Several practice problems are included at the end of each chapter with the answers provided.
Geotechnical Abstracts
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Author :
language : en
Publisher:
Release Date : 1992
Geotechnical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Engineering geology categories.
Advances In Deep Foundations
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Author : Yoshiaki Kikuchi
language : en
Publisher: Taylor & Francis
Release Date : 2007-06-21
Advances In Deep Foundations written by Yoshiaki Kikuchi and has been published by Taylor & Francis this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-06-21 with Technology & Engineering categories.
Civil Engineering has recently seen enormous progress in the core field of the construction of deep foundations. This book is the result of the International Workshop on Recent Advances in Deep Foundations (IWDPF07), which was held in Yokosuka, Japan from the 1st to the 2nd of February, 2007. Topics under discussion in this book include recent rese
Drilled Shafts
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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.
Highway Research And Development Studies Using Federal Aid Research And Planning Funds
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Author :
language : en
Publisher:
Release Date : 1969
Highway Research And Development Studies Using Federal Aid Research And Planning Funds written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Highway research categories.