Download or read book Effects of Stress Path and Prestrain History on the Undrained Monotonic and Cyclic Loading Behaviour of Saturated Sand written by Edwin Kwok Fai Chung and published by . This book was released on 1985 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Canadiana written by and published by . This book was released on 1986 with total page 824 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cyclic behaviour and liquefaction potential of silty sand Experimental and numerical investigations written by Abdulaziz Osman Abdelkadr and published by BoD – Books on Demand. This book was released on 2023-01-01 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study experimental and numerical investigations have been carried out with the emphasis on studying the behaviour and liquefaction state of typical silty sand sampled from the Mekelle area in Ethiopia under monotonic and cyclic undrained loadings. Experiments have been carried out to measure the pore pressure accumulation, deformation characteristics and related effective stress paths. A numerical model was then used to simulate the behaviour and liquefaction state associated with the changes in the stress-strain-pore pressure levels by means of the finite element method (FEM) using the FE code Tochnog (Tochnog Professional Company 2021).

Download or read book Cyclic Loading of Carbonate Sand written by Sharuddin bin Md Salleh and published by . This book was released on 1992 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: CARBONATE, SILICA, CRUSHING, TRIAXIAL, CYCLIC PORE PRESSURE, PERMANENT STRAIN, STRESS PATH, CRITICAL STATE, CYCLIC MOBILITY.

Download or read book A Study of the Behaviour of Saturated Sand During Repeated Loading written by Eric Raymond Farrell and published by . This book was released on 1970 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Undrained Behavior of Sandy Soils Subjected to Simultaneous Cyclic and Monotonic Straining written by Sh-Quan Lin and published by . This book was released on 1998 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Testing Conditions on the Constitutive Behavior of Loose Saturated Sands Under Monotonic Loading written by Michael Fred Riemer and published by . This book was released on 1992 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Effects of Cyclic Triaxial Testing Techniques on the Liquefaction Behavior of Monterey No 0 Sand written by John Paul Mulilis and published by . This book was released on 1976 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cyclic Stress strain and Liquefaction Characteristicsof Sands written by Adolfo Alarcon-Guzman and published by . This book was released on 1986 with total page 591 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liquefaction of saturated sand and silty sand deposits has been recognized as a major cause of damage during earthquakes. However, in spite of many research studies during the past two decades, there are still conflicting opinions on critical aspects of the phenomenon of soil liquefaction, including the definition of the term "liquefaction." For these reasons, a research program on the behavior of cohesionless soils under cyclic loading was initiated at Purdue University. An important effort was devoted to delineate and understand the physical factors controlling the response of cohesionless soils to cyclic loading and consequently, the factors involved in the different phenomena which have been described with the term "liquefaction" such as steady-state flow, a condition of zero effective stress, or cumulative residual strains due to cyclic loading. A new hybrid resonant column/torsional shear apparatus was designed and built as a part of this research program. The new apparatus permits the determination of dynamic soil properties on a single solid or hollow cylinder specimen over the entire range of shear strain amplitudes of engineering interest, i.e. from 10('-4)% to 10%. Torsional shear tests were performed with the new apparatus on reconstituted specimens of Ottawa 20-30 sand. Among other things, it was found that: (a) the maximum shear modulus, G(, max), is relatively insensitive to important factors affecting the undrained behavior of sands such as stress ratio (and hence fabric), stress history, and cyclic prestraining. Consequently, a direct correlation between G(, max) and liquefaction potential is not possible; (b) if staged testing includes the determination of shear moduli by means of resonant column tests, which imply the application of a considerable number of cycles, it can lead to significant overestimations of shear modulus for sands with no prior cyclic strain history even at shear strain amplitudes as low as 1.1 x 10('-2)%; and (c) at a given rela.

Download or read book A Comprehensive Investigation of the Behavior of Saturated Sands Subjected to Cyclic Triaxial Loadings written by James F. Kanipe and published by . This book was released on 1971 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Sand Plasticity Model for Earthquake Engineering Applications written by Aikaterini Ziotopoulou and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of the sand plasticity model PM4Sand (Versions 2 and 3) for geotechnical earthquake engineering applications is presented. The motivation behind this work is twofold. The first goal is to have a constitutive model that is applicable to the wide range of conditions encountered in geotechnical engineering practice, is easy to calibrate utilizing the limited data that are usually available and can reasonably approximate the behaviors of interest. The second goal is to provide an extensive documentation of the capabilities and limitations of the model. The PM4Sand plasticity model is built upon the basic framework of the stress-ratio controlled, critical state compatible, bounding surface plasticity model for sand presented by Dafalias and Manzari (2004). A series of modifications and additions to the model were incorporated by Boulanger (2010; Version 1) and further herein (Version 2 and Version 3) to improve its ability to approximate the stress-strain responses important to geotechnical earthquake engineering practice; in essence, the model is calibrated at the equation level to provide for better approximation of the trends observed in empirical correlations commonly used in practice. Each stage of its development has been guided by consecutive cycles of formulation, validation and calibration against the whole body of available data (case histories, lab, centrifuge and shake table tests) on the cyclic behavior of sands both at the element and at the system level. The formulation of PM4Sand Version 2 for geotechnical earthquake engineering applications is presented followed by its calibration and implementation. A generalized calibration of the constitutive model is presented which attempts to produce drained and undrained, monotonic and cyclic responses under a broad range of stress conditions that are reasonably consistent with the behaviors expected based on engineering correlations to commonly available in-situ test data (i.e., SPT, CPT and Vs data). Simulated single element responses are compared to design correlations to illustrate the efficacy of the model modifications and evaluate the model’s performance. The constitutive model is shown to be relatively easy to calibrate and provide reasonable responses for key liquefaction behaviors. The numerical implementation as a user defined material for use in a two-dimensional explicit finite difference program is described. The formulation of PM4Sand Version 3 for improved modeling of post-liquefaction reconsolidation strains is presented. Modifications are introduced that provide a means for improved modeling of post-liquefaction reconsolidation strains after the end of strong shaking in a nonlinear deformation analysis. The methodology of the approach along with the calibration is presented, followed by a comparison of the response computed for a field case history. A review is presented on the performance of a number of constitutive models in reasonably predicting liquefaction effects under sloping ground conditions. Example results from undrained cyclic DSS tests on clean sands under zero and nonzero static shear stress ratio conditions are presented and findings from past experimental studies for these types of loading conditions are reviewed. Examples are presented of the performance of selected constitutive models in modeling the observed experimental results. It is shown that they all have certain limitations and that the effect of sloping ground conditions is particularly difficult to simulate. Finally, the formulation of PM4Sand Version 3 is further updated to better account for the effects of sloping ground conditions and irregular cyclic loading on liquefaction behaviors and thus improve simulations of liquefaction-induced deformations of sloping ground. Existing laboratory test data are reviewed and new experimental data from undrained cyclic Direct Simple Shear (DSS) lab tests of liquefiable sand under sloping ground conditions subjected to irregular cyclic loading are introduced. Evidence from the tests shows that it is the effect of loading history on the dilatancy and stiffness characteristics of the response that is not properly captured by the model. The modifications made in Version 3 include a revised dependency of dilatancy and plastic modulus on the fabric tensor and its history. These modifications are introduced using the irregular cyclic DSS testing to illustrate the motivations for the changes in the constitutive equations. Finally, two examples of calibration are presented: one against a specific lab test result for a single sand and one against an engineering correlation describing trends observed for many sands across a broader range of relative densities, confining stresses, and loading conditions. The updated formulation in Version 3 of the model is shown to better approximate liquefaction behaviors for sloping ground conditions.

Download or read book Effects of Principal Stress Rotation and Intermediate Principal Stress Changes on the Drained Monotonic and Undrained Cyclic Behavior of Clean and Nonplastic Silty Ottawa Sands Formed Underwater written by Erdem Onur Tastan and published by . This book was released on 2009 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Constitutive Relations for Saturated Sand Under Undrained Cyclic Loading written by William G. Pierce and published by . This book was released on 1985 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress Path Effect on Static and Cyclic Behavior of Monterey No 0 30 Sand written by Jing-Wen Chen and published by . This book was released on 1988 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Behaviour of an Unsaturated Silty Sand Under Monotonic and Cyclic Loading written by Dejin Hu and published by . This book was released on 2011 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this thesis is to experimentally study the behaviour of unsaturated soil in terms of shear-dilatancy relationship under constant matric suction (CS) and constant water content (CW) during monotonic or cyclic loading. The influence of matric suction and its history (wetting/drying) on volume behaviour of unsaturated soil was traditionally discussed under isotropic or one-dimensional condition. This thesis studied the influence of matric suction and its history (with/without one cycle of wetting/drying) on shear-dilatancy response of unsaturated soil under drained (CS) or undrained (CW) shear loading. Two groups of tests with/without a wetting/drying cycle during matric suction initialization manifested significant different shear-dilatancy response. The influence of matric suction history on the soil structure appeared to be significant. After wetting/drying cycle, unsaturated soil achieved more stable structure (less shear-dilatancy). However, the influence of matric suction initialization became less significant under higher net confining pressure. In this study, the behaviour of unsaturated soil was also studied under two stress level of cyclic loading with limited number of load cycles. Stiffening, overall volume compression and matric suction decrease with loading cycles were observed in both stages of cyclic loading. Matric suction change during cyclic loading appeared to correlate with the volume strain response. The change rates of deformation response and matric suction decreased with the number of cycles, as their magnitudes became stable after limited loading cycles. Significant jumps in dilatancy were detected when loading direction reverses at both the peak and the trough of deviator stress, but continuous shear-dilatancy relationship was detected after the jumps during both stages of cyclic reloading or unloading. The shear-dilatancy response of unsaturated soil during both stages of cyclic reloading is different from that of virgin loading or the first loading. This study provides significant evidences that equivalent effective stress gave better interpretation than two independent stress variables in terms of strength and shear-dilatancy response of unsaturated soil.

Download or read book Undrained Response of Monterey 0 30 Sand Under Multidirectional Cyclic Simple Shear Loading Conditions written by Ann Marie Kammerer and published by . This book was released on 2002 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Stress dilatancy Behaviour of Sands written by Katrina Regier and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: