Download or read book The Effect of the Loading Conditions Upon the Skin Friction Resistance of Piles Buried in Cohesionless Soils written by Juan Jose Dalmasy Montalvo and published by . This book was released on 1962 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Surface Characteristics on the Supporting Capacity of Friction Piles written by Gerald Lee Baker and published by . This book was released on 1958 with total page 104 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 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 Numerical and Experimental Study of Shaft Resistance of Piles in Granular Soils written by Mostafa A. Abdel Rahman and published by . This book was released on 1988 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Register of Degrees Awarded by the Graduate Faculty of Cornell University written by Cornell University and published by . This book was released on 1951 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Soil Slope on Lateral Capacity of Piles in Cohesive and Cohesionless Soils written by Nontapat Nimityongskul and published by . This book was released on 2012 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of full-scale lateral loading tests for instrumented piles in cohesive and cohesionless soils were carried out at Oregon State University to assess the lateral response of piles in freefield and near slope conditions. Instrumentation data from the free-field piles and the piles installed at different distances from the slope crest were used extensively to monitor lateral pile response and to back-calculate p-y curves. For the cohesive soil tests, it was found that for small pile head displacements (less than 1.0 inch), the proximity of slope has insignificant effects on piles 2D or further from the slope crest where D is the pile diameter. For the piles on the slope crest, the effects of the soil slope should always be considered. The presence of the slope has insignificant effects for piles installed at distances of 8D or greater from the crest. For the cohesionless soil tests, the effects of slope on lateral pile capacity are insignificant at displacements of less than 2.0 inches for piles located 2D and further from the crest. For piles located at 4D or greater from the slope crest, the effects of slope on p-y curves are insignificant.
Download or read book Pile Design and Construction Practice written by Willis H. Thomas and published by CRC Press. This book was released on 2007-12-06 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: This international handbook is essential for geotechnical engineers and engineering geologists responsible for designing and constructing piled foundations. It explains general principles and practice and details current types of pile, piling equipment and methods. It includes calculations of the resistance of piles to compressive loads, pile group
Download or read book Piles in Weak Rock written by and published by Thomas Telford. This book was released on 1977 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Factors Affecting the Frictional Resistance of Piles Driven in Cohesionless Soils written by Jorge Oscar Silberman and published by . This book was released on 1961 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design of Pile Foundations written by Aleksandar Sedmak Vesić and published by Transportation Research Board. This book was released on 1977-01-01 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of Skin Friction and Creep of Piles in Clay written by Indrasurya Budisatria Mochtar and published by . This book was released on 1985 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Response of Pile Foundations Due to Lateral Force and Soil Movements written by Hongyu Qin and published by . This book was released on 2010 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : This research has investigated the response of pile foundations subjected to lateral force applied directly to pile head and loadings arising from lateral soil movements of the surrounding ground. The behaviour of pile foundations subjected to lateral soil movements was studied through physical modelling with a specially designed testing apparatus. Laboratory experiments have been undertaken on a single pile embedded in progressive moving sand. A triangular loading block was used in the model tests to induce a progressive soil movement profile. Apart from eight general tests, sixteen tests were conducted on a single pile to examine the effects of the distance between the source where soil movements were induced and the pile location, the magnitude of axial load applied at pile head, the variation of loading block angle, varying combination of sliding and stable layer depths, and pile diameter on the responses of piles. The results of previously conducted pile tests with a uniform soil movement profile were compared with those of the current tests to examine the effect of soil movement profiles on the pile behaviour. Simple solutions were proposed for predicting the pile responses. They provided good estimate of the development of maximum bending moment and maximum shear force in the piles with soil movement. Importantly, the maximum bending moments induced by the soil movements were found to be linearly related to the maximum shear forces (sliding thrust), independent of the magnitude and depth of soil movement and soil movement profiles. Experiments have also been conducted on pile groups in progressive moving sand, including various pile group configurations and spacing. Both free-head and cappedhead fixity conditions have been considered. The findings show that the resistances of the piles to lateral soil movements significantly rely on their locations in a group, especially for piles arranged in a line parallel to the soil movement direction. The results of the pile group tests were compared with those of the single pile tests. Group factors were defined in terms of maximum bending moment and modulus of subgrade reaction to quantify the impact of group effect. The simple solutions developed were extended for predicting the response of individual piles in a group with soil movement. The static and cyclic responses of laterally loaded piles in cohesionless soils have been investigated as well. Guideline for estimating the design parameters for laterally loaded rigid piles in cohesionless soils were provided from extensive back calculation of measured responses of fifty-one pile tests. The elastic-plastic solutions presented by Guo (2008) were used in the back calculation. Simple expressions were presented for estimating the parameters used in the solutions. The reliability of the back calculation, the effects of the ratio of loading eccentricity to pile embedded length on the nonlinear pile response and lateral load capacity were investigated. Additionally, the apparatus was modified to apply cyclic lateral loading, with which a series of model tests were conducted on piles in dry sand under static and cyclic loadings. Analyses of the test results show that the cyclic load level has a greater impact on the pile behaviour than the number of cycles. It is noted that the gradient of the limiting force profile will decrease and the modulus of subgrade reaction will increase, after a number of unloading and reloading cycles. The induced maximum bending moment can be estimated from the applied lateral load, eccentricity of the load, and the depth at which the maximum bending moment occurs.
Download or read book Negative Skin Friction Induced on Piles in Collapsible Soils Due to Inundation written by Sarah Tahsin Noor Kakoli and published by . This book was released on 2011 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collapsible soils experience significant volume decrease due to the increase of soil moisture content, with or without an increase in the in-situ stress level. These soils form large parts of North and South America, Eastern Europe, China, Central Asia, Northern and Southern Africa, Russia, Egyptian western dessert, and the continuous deposit from North China to South-East England. As human activities continue to increase in these regions, geotechnical engineers must learn how to deal with these problematic soils. Foundations on collapsible soils suffer from sudden settlement, which may contribute to serious damage or catastrophic failure due to inundation. For relatively light structures, the use of shallow foundations combined with soil replacement or treatment may constitute economical designs. For heavy structures, pile is perhaps the best of alternative available types of foundation. This subject of significant practical interest has received little attention from the researchers mainly due to the complexity in conducting experimental study. Furthermore, numerical modeling is difficult at best due to the complexity associated in describing the behavior of collapsible soil during inundation. Analytical modeling is not suitable in this respect, as soil grains in collapsible soil undergo radical rearrangements during inundation. In the literature, no design theory can be found to predict the negative skin friction on pile foundation due to inundation of collapsible soil. Present study presents a numerical model, which is capable to incorporate the effect of inundation of collapsible soil on an axially loaded vertical pile. It employs the theories of unsaturated soil mechanics; including the Soil-Water Characteristic Curve (SWCC) to include the effect of soil suction reduction resulted from the progressive inundation, from two different aspects: change in soil properties, and irrecoverable soil volume change. The proposed numerical model is used to predict negative skin friction exerted on the pile during inundation of collapsible soil surrounding the pile. The numerical model is validated by comparing the numerical results and the experimental data from the literature. Moreover, another numerical modeling procedure is also proposed to design the pile (i.e., length and diameter) in collapsible soil, provided that the indirect load due to negative skin friction is known. An extensive numerical investigation is carried out to identify the parameters (e.g., collapse potential, radius of wetting, pile roughness, etc.) influencing the negative skin friction acting on a pile during inundation. Based on the numerical results, analytical models that can be directly used to predict the indirect load due to negative skin friction are established for both directions (i.e., from bottom and top) of inundation. Design procedures that can provide adequate positive skin friction and pile capacity in accommodating indirect load due to negative skin friction, are proposed to design the length and diameter of a single pile in collapsible soil subjected to inundation. Present study is useful in reductions in the costs of construction, litigation and remediation in geotechnical engineering practice.
Download or read book Geotechnical abstracts written by and published by . This book was released on 1978 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nonlinear Behavior and Modeling of Piles in Partially Liquefied and Layered Soil Conditions written by Barbara Jean Chang and published by . This book was released on 2011 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: Saturated soils, particularly cohesionless soils, may liquefy when subjected to earthquake excitation, resulting in reductions in strength and stiffness of the soil. The consequences have shown to be devastating to foundations in past earthquakes. For pile foundations, a reduction of vertical or lateral soil resistance may cause failure of the super structure. To study this issue, two unique 1-g soil-pile tests were conducted. The models were constructed in a laminar soil box which was subsequently placed on a uniaxial shake table. One experiment focused on characterizing the soil resistance of partially liquefied soil, while the other on multi-layered soil and the effect of its movement and load demands on the nonlinear behavior of piles. These two different experimental configurations illustrate scenarios commonly observed in the field, where the behavior of the soil and the pile merit further investigation. While evidence in the literature indicates that the lateral soil ("p-y") resistance of piles in liquefiable soils is significantly reduced, the shape and amplitude of the reduced p-y curve during pore pressure build-up is not well understood. To investigate this, a single steel pile embedded in homogeneous saturated Nevada sand was subjected to sequential dynamic shaking and lateral inertial equivalent loading. A key goal in the test program was to develop a data set capable of rendering insight into the characteristics of p-y resistance under developing and partial liquefied soil conditions. Test data were used to back-calculate p-y resistance curves for partially liquefied soils. These curves are subsequently adopted in a numerical study of the behavior of piles in partially liquefied soils considering different layering conditions. In contrast, in a multi-layered soil profile, if a loose layer liquefies, large localized plastic demands may be generated in the piles. In the case of concrete piles, these demands manifest flexural cracks in the concrete, which weakens the pile and exposes it to subsequent environmental degradation. During the experiments conducted herein to study this issue, plastic demands in the pile were characterized using curvature profiles coupled with back-calculation of the plastic hinge length and post-test physical observations. Numerical modeling studies demonstrate the applicability of current design-oriented tools to capture these key response parameters needed for design.
Download or read book Shaft Resistance of Driven Piles in Overconsolidated Cohesionless Soils written by Yasir Mohammed Alharthi and published by . This book was released on 2018 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Piles are structural members that transfer the applied load of superstructures to deep supportive layers of soil or bedrock. Besides controlling the settlement of structures, piles provide sufficient capacity that other foundations cannot provide or provide only at a high cost. Despite ample research on the shaft resistance of displacement piles in cohesionless soils, the mechanism of such resistance remains unclear. Consequently, theories on shaft resistance have generated several discrepancies in predicting the capacity of displacement piles in cohesionless soils, not only due to the complexity of modeling cohesionless materials and collecting field data but also because the role of overconsolidation in such soils, which is often neglected. Although the critical depth of pile foundation in cohesionless soils has long been debated, definite conclusions have yet to be drawn. Overconsolidation in cohesionless soils directly affects the lateral earth pressure that acts upon the pile shafts and thus upon pile capacity. Overconsolidation can occur naturally or artificially when the ground surface is subjected to erosion, excavation, or unloading, often due to glacial melting, the demolition of structures, raised water tables, compaction, or vibration. This thesis presents an experimental investigation into the capacity of driven piles in overconsolidated cohesionless soils. Tests, with an emphasis on the shaft resistance and the critical depth, were conducted on long piles in a setup that permits measuring the overconsolidation ratio in the test tank as well as the total and local shaft resistance on the pile's shaft. Shear stress distribution along the pile's shaft showed some dependency on embedment depth ratio (L / D). Also, critical depth was observed for shaft resistance only when mean shaft resistance was analyzed, and was in line with Meyerhof's (1976) results. An analytical model was also developed based on limit equilibrium analysis using the horizontal slice method to predict the shaft resistance of a pile driven into normally consolidated cohesionless soils. The model assumes an inclined failure surface around the pile that accounts for the shear and normal stresses upon it. Critical depth was not only observed but also increased linearly as the angle of shearing resistance increased. A three-dimensional numerical model was developed and validated experimentally to perform 200 pile load tests in soils with various densities and at a range of embedment depths. Design theories to predict the shaft resistance of displacement piles in cohesionless soils and the critical depth were developed, design charts are presented.
