Download or read book The Mechanics of Pile soil Interaction in Cohesionless Soils written by David Michael Holloway and published by . This book was released on 1975 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Mechanics of Pile soil Interaction in Cohesionless Soils written by David Michael Holloway and published by . This book was released on 1975 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foundation conditions and structural constraints often require the use of pile foundations to support the structure and to minimize objectionable settlements. The accurate prediction of foundation performance and the effective interpretation of field load tests are urgent economic and technical needs of geotechnical engineering practice. This study represents the final phase of an investigation into the analysis of pile load tests. Overall study objectives have been: (a) to compile and make available to the Corps of Engineers (CE) offices the results of pile load tests performed by CE offices and other investigators; (b) to review analytical solutions for determining pile load capacity; (c) to compare pile load tests results with theoretical solutions; (d) to develop improved methods for conducting and interpreting pile load tests; and (e) to develop design guidelines.

Download or read book The Mechanics of Pile soil Interaction in Cohesionless Soils written by David Michael Hollaway and published by . This book was released on 1975 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Mechanics of Pile soil Interaction in Cohesionless Soil written by D. M. Holloway and published by . This book was released on 1975 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil pile Interaction in Loose Cohesionless Submerged Soils written by Gurkan Ozden and published by . This book was released on 1999 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Pile Pile Group Foundations and Pipeline Systems Interaction Behavior Extending Saturated and Unsaturated Soil Mechanics written by Mohammed Al-Khazaali and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid growth in population along with positive trends in global economy over the past several decades has significantly contributed to an increased demand for various infrastructure needs worldwide. For this reason, the focus of this thesis has been directed towards extending the mechanics of unsaturated soils, which is an emerging geotechnical engineering field to investigate the behavior of two key infrastructure systems, namely pile foundations and energy pipeline systems. The mechanism of soil-pile foundations and soil-pipeline systems interaction behavior has several similarities. Both these infrastructure facilities require comprehensive understanding of the soil-structure interaction mechanism. Reliable estimation of mechanical properties of both the soil and the soil-structure interface is required for the rational interpretation the load-displacement behavior of pile foundations and pipeline systems. Currently, the design of systems is predominantly based on design codes and guidelines that use empirical procedures or employ the principles of saturated soil mechanics. In many scenarios, pile foundations extend either totally or partly in unsaturated soils as the groundwater table level in many regions is at a greater depth. Such scenarios are commonly encountered in semi-arid and arid regions of the world. In addition, pipeline systems are typically buried at shallow depths in unsaturated soil strata, which are susceptible to wetting and drying, freezing and thawing cycles or both, due to seasonal environmental changes. Capillary stress or matric suction in the unsaturated zone increases the effective stress contribution towards the shear strength and stiffness of soil and soil-structure interface. Extending saturated soil mechanics to design or analyze such structures may lead to erroneous estimation of pile foundation carrying capacity or loads transferred on pipeline body from the surrounding unsaturated soil. Experimental, analytical and numerical investigations were undertaken to study the behavior of single pile, pile group, and pipeline systems in saturated and unsaturated sands under static loading. The experimental program includes 40 single model pile and 2{604}2 pile group, and six prototype pipeline tests under saturated and unsaturated condition. The results of the experimental studies suggest that matric suction has significant contribution towards the mechanical behavior of both pile foundation and pipeline system. The axial load carrying capacity of single pile and pile group increased approximately 2 to 2.5 times and the settlement reduced significantly compared to saturated condition. The influence of matric suction towards a single pile is significantly different in comparison to pile group behavior. The cumulative influence of matric suction and stress overlap of pile group behavior in sandy soils result in erroneous estimation of pile group capacity, if principles of saturated soil mechanics are extended. Group action plays major role in changing the moisture regime under the pile group leading to incompatible stress state condition in comparison to single pile behavior. On the other hand, the peak axial load on the pipe is almost 2.5 folds greater in unsaturated sand that undergoes much less displacement in comparison to saturated condition. Such an increase in the external axial forces may jeopardize the integrity of energy pipeline systems and requires careful reevaluation of existing design models extending the principles of unsaturated soil mechanics. Two analytical design models to estimate the axial force exerted on pipeline body were proposed. The proposed models take account of matric suction effect and soil dilatancy and provide smooth transition from unsaturated to saturated condition. These models were developed since measurement of the unsaturated soil and interface shear strength and stiffness properties need extensive equipment that require services of trained professional, which are expensive and time consuming. The models utilize the saturated soil shear strength parameters and soil-water characteristic curve (SWCC) to predict the mechanical behavior of the structure in saturated and unsaturated cohesionless soils. The prototype pipeline experimental results were used to verify the proposed models. The predicted axial force on pipeline using the proposed models agrees well with the measured behavior under both saturated and unsaturated conditions. Moreover, numerical techniques were proposed to investigate the behavior of pile foundation and pipeline system in saturated and unsaturated sand. The proposed methodology can be used with different commercially available software programs. Two finite element analysis programs were used in this study; namely, PLAXIS 2D (2012) to simulate soil-pile foundation behavior and SIGMA/W (2012) to simulate soil-pipeline system behavior. The proposed techniques require the information of unsaturated shear strength and stiffness, which can be derived from saturated soil properties and the SWCC. The model was verified using pile and pipeline test results from this study and other research studies from the published literature. There is a good agreement between the measured behavior and the predicted behavior for both the saturated and unsaturated conditions. The methodology was further extended to investigate the behavior of rigid and flexible pipelines buried in Indian Head till (IHT) during nearby soil excavation activity. The simulation results suggest that excavation can be extended safely without excessive deformation to several meters without the need for supporting system under unsaturated condition. The studies summarized in the thesis provide evidence that the principles of saturated soil mechanics underestimate the pile foundations carrying capacity as well as the axial force exerted on pipelines in unsaturated soils. Such approaches lead to both uneconomical pile foundation and unsafe pipeline systems designs. For this reason, the pile and pile group carrying capacity and pipeline axial force should be estimated taking into account the influence of matric suction as well as the dilatancy of the compacted sand. The experimental studies, testing techniques along with the analyses of test results and the proposed analytical and numerical models are useful for better understanding the pile foundation and buried pipeline behaviors under both saturated and unsaturated conditions. The proposed analytical and finite element models are promising for applying the mechanics of unsaturated soils into conventional geotechnical engineering practice using simple methods.

Download or read book User s Manual for DUKFOR written by D. Michael Holloway and published by . This book was released on 1976 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book User s Manual for AXISYM written by D. Michael Holloway and published by . This book was released on 1976 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Study of the Thermo active Piles Behavior in Cohesionless Soils written by Maria Elizabeth Suryatriyastuti and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent technology for the heating/cooling building system, known as thermo-active piles, has effectively reduced the land use area and drilling cost by incorporating the vertical closed-loop heat exchanger pipes into the pile foundations. The heat transfer principle remains the same with the conventional ground heat exchanger system: an extraction of the steady ground temperature during winter and a recharge of the ground thermal energy during summer. Indeed, the energy transfer in the thermo-active pile system is becoming more complex owing to the thermo-hydro-mechanical interaction between the ground, the aquifer, the concrete pile, and the overlying building. Recently in France, the implementation of this novelty faces some difficulties due to the lack of understanding about the potential impact of seasonal temperature cycles on the environmental sustainability and the structural safety. Considering those concerns, this thesis conducts the study of the thermo-active piles behavior and their interaction with the structure and the environment in the intention to optimize the geotechnical design of such piles according to the French design standard for the deep foundations. First of all, a study of the physical phenomena occurring in the entire system under the thermo-hydro-mechanical interactions is conducted. Since the ratio of the pile diameter and the pile length is very small, the temperature variations in the pile affect mainly the pile axial response. Thus, the study interest is narrowed to the impact of temperature cycles on the pile bearing capacity by paying a particular attention on modeling the soil-structure interaction with finite difference method. A set of three-dimensional numerical models is performed to understand the thermo-active piles response located in cohesionless soil with consideration of several loading stages and various restraint conditions. The first model concerns a single thermo-active pile subjected to a single thermal load, the second deals with a single thermo-active pile under combined axial mechanical and cyclic thermal loads, and the third one is related to the thermo-active piles located in a group of piles to observe the influence on the other classical bearing piles. The need to properly render the cyclic plasticity behavior in such piles is provided by modeling the interface elements at the soil-pile contact zone using the laboratory-developed law named 'Modjoin' law. Otherwise, the load transfer t-z method in one-dimensional model can be an alternative solution in the practical geotechnical design, but no t-z law that takes into account the cyclic fatigue effects exists yet. This study carries out a development of the existing t-z law by integrating the nonlinearity condition and cyclic hardening rules.

Download or read book Behavior of Piles and Pile Groups in Cohesionless Soils written by and published by . This book was released on 1985 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to gain a better understanding of the behavior of piles in sand, an extensive search of the literature has been performed to collect data on instrumental piles driven in sand and tested under vertical loads. The load transfer characteristics of the piles were then analyzed without considering residual stresses. Wherever the data allowed it, the load transfer analysis was repeated after considering residual driving stresses. The results of this method as well as conventional and new in situ tests methods were then compared to actual load test results. Areas of critical need for further research are pointed out and recommendations are made for their implementation.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1976 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanics of Geomaterial Interfaces written by A.P.S. Selvadurai and published by Elsevier. This book was released on 1995-01-30 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of geomaterial interfaces recognizes the important influences of the interface behaviour on the performance of interfaces involving cementaceous materials such as concrete and steel, ice-structure interfaces, concrete-rock interfaces and interfaces encountered in soil reinforcement. During the past two decades, the subject of geomaterial interfaces has attracted the concerted attention of scientists and engineers both in geomechanics and applied mechanics. These efforts have been largely due to the observation that the conventional idealizations of the behaviour of interfaces between materials by frictionless contact, bonded contact, Coulomb friction or finite friction tend to omit many interesting and important influences of special relevance to geomaterials. The significant manner in which non-linear effects, dilatancy, contact degradation, hardening and softening, etc., can influence the behaviour of the interface is borne out by experimental evidence. As a result, in many instances, the response of the interface can be the governing criterion in the performance of a geomechanics problem. The primary objective of this volume is to provide a documentation of recent advances in the area of geomaterial interfaces. The volume consists of subject groupings which cover ice-structure, soil-structure and steel-concrete interfaces, mechanics of rock and concrete joints and interfaces in discrete systems.

Download or read book Geotechnical and Geoenvironmental Engineering Handbook written by R. Kerry Rowe and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preface. Dedication. List of Figures. List of Tables. List of Contributors. Basic Behavior and Site Characterization. 1. Introduction; R.K. Rowe. 2. Basic Soil Mechanics; P.V. Lade. 3. Engineering Properties of Soils and Typical Correlations; P.V. Lade. 4. Site Characterization; D.E. Becker. 5. Unsaturated Soil Mechanics and Property Assessment; D.G. Fredlund, et al. 6. Basic Rocks Mechanics and Testing; K.Y. Lo, A.M. Hefny. 7. Geosynthetics: Characteristics and Testing; R.M. Koerner, Y.G. Hsuan. 8. Seepage, Drainage and Dewatering; R.W. Loughney. Foundations and Pavements. 9. Shallo.

Download or read book The Pressuremeter written by Jean-Louis Briaud and published by Routledge. This book was released on 2019-07-16 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: This classic title deals presents all one needs to know about pressuremeter test, a soil and rock test used in civil engineering. It consists of placing a cylindrical probe in the ground and expanding the probe to pressurize the soil or the rock horizontally. The pressure on the soil and the relative increase in cavity radius are obtained and give an in situ stress strain curve. The pressuremeter test is repeated at various depths in order to obtain profiles of soil parameters. The design applications of the preboring pressuremeter test include: shallow foundations under vertical loads, deep foundations under vertical and horizontal loads, ground anchors, cantilever drilled shaft walls and anchored bulkheads, pavements, stone columns, ground improvement and compaction control.

Download or read book Lateral Response of Piles in Saturated Cohesionless Soils written by Peter James Algie and published by . This book was released on 2012 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates the lateral response of single piles embedded in saturated cohesionless soils on flat ground, with no crust layer. OpenSeesPL, a numerical modelling software programme, was used as the principal means of this investigation. Several 'rules of thumb' that could be used in pseudo-static methods were developed. Soil-pile interaction in saturated cohesionless soils is a changing and multi-variable problem, and therefore is not well understood. This is because the soil is prone to liquefaction when subject to dynamic loads. These variables include changing soil stiffness and damping, changing soil-pile-structure resonant frequency and changing loads. The response of piles subject to lateral static pushover loads was considered. OpenSeesPL and an elastic continuum pile analysis method proposed by Budhu and Davies (1987) can predict lateral pile response reasonably accurately. Initial soil stiffness equal to approximately 1/3 to 1/4 of the small strain moduli should be used. The friction angle in both analysis methods has to account for strain softening beyond peak resistance in dense sands. Pile response subject to lateral dynamic loads at the pile head was analysed. It was found that piles dynamically loaded at the pile head can lead to the adjacent soil liquefying, which reduces the soil stiffness and increases the strain dependent material damping. Nonlinear OpenSeesPL models and an inertial pseudo-static method along with the Budhu and Davies method for elastic soils with appropriate reductions in soil stiffness can be used to reasonably predict the response of piles dynamically excited at the pile head. The lateral response of piles subject to dynamic excitation of the underlying bedrock was investigated. Maximum ground surface accelerations and pile response in liquefiable soils was found to occur during an initial transient phase before the onset of full liquefaction. During this phase, the soil has a linear stiffness distribution with depth and the soil stiffness near the ground surface (i.e. at one pile diameter) is equal to approximately 20% of the initial stiffness at that depth. An elastic equivalent pseudo- static method for determining lateral pile response subject to kinematic and inertial interaction was developed.

Download or read book Lateral Pile soil Interaction in Liquefiable Soils written by Suresh R. Dash and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of Pile Foundations in Liquefiable Soils written by Gopal Madabhushi and published by Imperial College Press. This book was released on 2010 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pile foundations are the most common form of deep foundations that are used both onshore and offshore to transfer large superstructural loads into competent soil strata. This book provides many case histories of failure of pile foundations due to earthquake loading and soil liquefaction. Based on the observed case histories, the possible mechanisms of failure of the pile foundations are postulated. The book also deals with the additional loading attracted by piles in liquefiable soils due to lateral spreading of sloping ground. Recent research at Cambridge forms the backbone of this book with the design methodologies being developed directly based on quantified centrifuge test results and numerical analysis. The book provides designers and practicing civil engineers with a sound knowledge of pile behaviour in liquefiable soils and easy-to-use methods to design pile foundations in seismic regions. For graduate students and researchers, it brings together the latest research findings on pile foundations in a way that is relevant to geotechnical practice. Sample Chapter(s). Foreword (85 KB). Chapter 1: Performance of Pile Foundations (4,832 KB). Contents: Performance of Pile Foundations; Inertial and Kinematic Loading; Accounting for Axial Loading in Level Ground; Lateral Spreading of Sloping Ground; Axial Loading on Piles in Laterally Spreading Ground; Design Examples. Readership: Researchers, academics, designers and graduate students in earthquake engineering, civil engineering and ocean/coastal engineering.