Development Of Design And Analysis Method For Slope Stabilization Using Drilled Shafts
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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.
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.
Drilled Shaft Foundations For Noise Barrier Walls And Slope Stabilization
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Author : Robert Y. Liang
language : en
Publisher:
Release Date : 2002
Drilled Shaft Foundations For Noise Barrier Walls And Slope Stabilization 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 2002 with Noise barriers categories.
The objectives of this research are to develop a methodology that would allow the use of the SPT (Standard Penetration Test) results for analysis and design of the laterally loaded drilled shafts and to develop a methodology for designing the drilled shafts to stabilize the unstable slopes and embankments.
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.
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.
Drilled Shaft Design And Construction Guidelines Manual Reese L C And Allen J D Structural Analysis And Design For Lateral Loading
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Author : Lymon C. Reese
language : en
Publisher:
Release Date : 1977
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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Bridges categories.
Slope Stability Analysis And Stabilization
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Author : Y. M. Cheng
language : en
Publisher: CRC Press
Release Date : 2014-05-20
Slope Stability Analysis And Stabilization written by Y. M. Cheng and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-05-20 with Technology & Engineering categories.
Includes Recommendations for Analysis, Design Practice, Design Charts, Tables, and More Using a unified approach to address a medley of engineering and construction problems, Slope Stability Analysis and Stabilization: New Methods and Insight, Second Edition provides helpful practical advice and design resources for the practicing engineer. This text examines a range of current methods for the analysis and design of slopes, and details the limitations of both limit equilibrium and the finite element method in the assessment of the stability of a slope. It also introduces a variety of alternative approaches for overcoming numerical non-convergence and the location of critical failure surfaces in two-dimensional and three-dimensional cases. What’s New in the Second Edition: This latest edition builds on the concepts of the first edition and covers the case studies involved in slope stability analysis in greater detail. The book adds a chapter on the procedures involved in performing limit equilibrium analysis, as well as a chapter on the design and construction practice in Hong Kong. It includes more examples and illustrations on the distinct element of slope, the relation between limit equilibrium and plasticity theory, the fundamental connections between slope stability analysis and the bearing capacity problem, as well as the stability of the three-dimensional slope under patch load conditions. Addresses new concepts in three-dimensional stability analysis, finite element analysis, and the extension of slope stability problems to lateral earth pressure problems Offers a unified approach to engineering and construction problems, including slope stability, bearing capacity, and earth pressure behind retaining structures Emphasizes how to translate the conceptual design conceived in the design office into physical implementation on site in a holistic way Discusses problems that were discovered during the development of associated computer programs This text assesses the fundamental assumptions and limitations of stability analysis methods and computer modelling, and benefits students taking an elective course on slope stability, as well as geotechnical engineering professionals specializing in slope stability
Development Of P And Y Multipliers For Design Of Slope Stabilizing Piles
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Author : Sajid Iqbal
language : en
Publisher:
Release Date : 2015
Development Of P And Y Multipliers For Design Of Slope Stabilizing Piles written by Sajid Iqbal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Slope failures can arise from many factors and such failures can have a big impact on public and private infrastructure. Drilled shafts have been used for the stabilization of slopes for many decades. Micropiling is a relatively new approach in slope stabilization applications that has been adopted by many agencies and used in many problematic sites across the globe. However, limited knowledge regarding load transfer for piles within moving soil may cause design of the piles to be more conservative than is actually needed. The objective of this work is to provide guidance on the effects of pile batter and spacing so designers can reasonably account for these effects when predicting response of piles from lateral loading within moving soils. Load transfer to piles within moving soil masses was analyzed using soil-structure interaction methods. Based on measured soil movements and sliding surface locations, p-y analyses were performed to backcalculate “best fit" p- and y-multipliers that would lead to prediction of the measured bending moments in the micropiles and drilled shafts. The back-calculated p-y parameters were compared with values from literature and with one another to develop recommendations for predicting lateral resistance in deep foundations for slope stabilization applications. As a result of this study, a method was established to obtain p- and y-multipliers for any combination of spacing and batter angle for micropiles with a capping beam. Results of analysis indicate that spacing ratio and batter angle are important factors that influence the resistance. Data suggest that closer spacing increases the resistance, but batter angle was observed to have the greatest effect on resistance. Data show that available resistance increases with batter angle from lower values for piles inclined upslope to greater values for piles inclined downslope. Further, a method was also established to obtain p- and y multipliers for predicting resistance of piles installed without a capping beam in a continuous row with no batter. Data suggest that closer spacing decreases the resistance.
Slope Stability Engineering
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Author : Institution of Civil Engineers (Great Britain)
language : en
Publisher: Thomas Telford
Release Date : 1991-04-15
Slope Stability Engineering written by Institution of Civil Engineers (Great Britain) and has been published by Thomas Telford this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-04-15 with Science categories.
This volume draws on the experience and extensive research of an international authorship to bring together details on slope stability, causes of landslides, landslide prevention, new techniques for assessing and predicting stability, new methods for stabilising slopes and the special considerations for coastal situations.
Slope Stability Analysis And Stabilization New Methods And Insight Second Edition
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Author : Y. M. Cheng
language : en
Publisher:
Release Date : 2014-01-01
Slope Stability Analysis And Stabilization New Methods And Insight Second Edition written by Y. M. Cheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-01-01 with categories.
Includes Recommendations for Analysis, Design Practice, Design Charts, Tables, and More Using a unified approach to address a medley of engineering and construction problems, Slope Stability Analysis and Stabilization: New Methods and Insight, Second Edition provides helpful practical advice and design resources for the practicing engineer. This text examines a range of current methods for the analysis and design of slopes, and details the limitations of both limit equilibrium and the finite element method in the assessment of the stability of a slope. It also introduces a variety of alternative approaches for overcoming numerical non-convergence and the location of critical failure surfaces in two-dimensional and three-dimensional cases. What s New in the Second Edition: This latest edition builds on the concepts of the first edition and covers the case studies involved in slope stability analysis in greater detail. The book adds a chapter on the procedures involved in performing limit equilibrium analysis, as well as a chapter on the design and construction practice in Hong Kong. It includes more examples and illustrations on the distinct element of slope, the relation between limit equilibrium and plasticity theory, the fundamental connections between slope stability analysis and the bearing capacity problem, as well as the stability of the three-dimensional slope under patch load conditions. Addresses new concepts in three-dimensional stability analysis, finite element analysis, and the extension of slope stability problems to lateral earth pressure problems Offers a unified approach to engineering and construction problems, including slope stability, bearing capacity, and earth pressure behind retaining structures Emphasizes how to translate the conceptual design conceived in the design office into physical implementation on site in a holistic way Discusses problems that were discovered during the development of associated computer programs This text assesses the fundamental assumptions and limitations of stability analysis methods and computer modelling, and benefits students taking an elective course on slope stability, as well as geotechnical engineering professionals specializing in slope stability"