Download or read book The Effects of Grain Characteristics on the Limiting Densities and Angle of Repose of Cohesionless Soils written by Thomas T. H. Wu and published by . This book was released on 1985 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Grain Characteristics on the Shear Strength of Cohesionless Soils written by Thomas T. H. Wu and published by . This book was released on 1986 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geotechnical Abstracts written by and published by . This book was released on 1975 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlation Between Gradational Parameters and Limiting Densities for Cohesionless Materials Placed Hydraulically written by HM. Reitz and published by . This book was released on 1973 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonreproducible relative density test results for an hydraulic fill of clean river sands, suggested errors either in assumed control densities or methods or techniques of field testing. Control densities had been assumed to vary only slightly because sample gradations and sizes appeared quite similar. To verify this assumption, separate maximum and minimum density (ASTM Test for Relative Density of Cohesionless Soils, D 2049-69) and gradational parameters were determined for each field density test. No dependable correlation of maximum or minimum densities or range between them with gradational characteristics was apparent for results reported.
Download or read book Experimental Study on Effects of Deterioration of Grains on Deformation and Strength Characteristics of Soils written by Mubashir Aziz and published by GRIN Verlag. This book was released on 2011-09-07 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doctoral Thesis / Dissertation from the year 2010 in the subject Engineering - Geotechnology, , course: Civil Engineering, language: English, abstract: With growing infrastructure developments in hilly areas and due to economical constraints of using locally available rockfill materials for construction of embankments, practicing engineers must be acquainted with geotechnical response of non-conventional granular soils. These materials are most likely to disintegrate with time due to physical and chemical weathering. In general, the laboratory investigations on durability characteristics of such materials are only made through simple slaking tests. However, studies examining the effects of slaking-induced disintegration of soil grains on the geotechnical engineering analysis and design parameters are rather limited. This is essentially due to the reason that the grains of standard laboratory sands are mostly durable and hence, the stress-strain response is considered to be unaffected by the presence of water. In order to explore the possible effects of deterioration of soil grains on static and dynamic properties of granular soils, a series of consolidated drained torsional shear tests on various crushed soft rocks were performed under saturated and dry conditions and compared with a well reported Toyoura silica sand consisting of durable grains. Due to the sensitivity of crushed rockfill to deteriorate upon water-submergence, test under dry conditions represented the response of a soil with intact grains, whereas a similar test under saturated condition simulated the potential reduction in strength and stiffness of the soil with time. From the grain size distributions determined after each test, a degradation index was defined to quantify the degree of disintegration of grains. Strength and deformation properties determined from monotonic as well as cyclic shear tests were then compared with this index. Possible correlations of water-induced deterioration of soil grains with consolidation behaviour, peak shear strengths, friction angles, dynamic shear stiffness, and volume-change characteristics during shearing were explored. In addition, the effects of confining stress and shear strain level on particle breakage were also investigated. It was concluded that time-dependent characterization of rockfill materials by monitoring the degree of deterioration can be helpful to avoid catastrophic geotechnical failures. Nonetheless, this study is a caution to conventional soil mechanics in which decay of grains and loss of soil strength with time are often uncared.
Download or read book Notes on the Stress deformation and Strength Characteristics of Soils written by Ronald C. Hirschfeld and published by . This book was released on 1960 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Particle Shape on the Engineering Properties of Granular Soils written by E. D'Appolonia and published by . This book was released on 1973 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of relative density correlations based on an "average" sand to predict soil behavior without considering the particle shape can result in poor or misleading predictions. Experimental data show that the particle shape has a pronounced effect on all engineering properties studied. Angularity of the particles increases the maximum void ratio, strength, and deformability of cohesionless soils. Variations in engineering properties due to particle shape can be as large as variations associated with large differences in relative density. Penetration tests in small containers with small rods suggest that the Standard Penetration Test is influenced by both the angularity and density of cohesionless soils.
Download or read book Society of Automotive Engineers Handbook written by Society of Automotive Engineers, Incorporated and published by . This book was released on 1985 with total page 1296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Angularity on the Compaction and Shear Strength of a Cohesionless Material written by Richard Edward Swiderski and published by . This book was released on 1976 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several physical methods are described for the practical measurement and rating of angularity (shape) of cohesionless soil particles. Angularity is determined by utilizing the fundamental property of a sphere: a sphere has the smallest contact surface area of any shape for a given volume. Therefore, any other shape will exhibit a greater contact surface area and consequently will have a greater frictional resistance which is a function of its degree of angularity. The effects of angularity on the physical behavior (e.g. strength) of cohesionless soils was investigated at various relative compaction densities. For this purpose a combined compaction and direct shear test device constructed from a modified standard Proctor compaction mold was devised. The samples used to determine the effect of particle shape on the physical behavior of cohesionless materials were produced in the lab from pure quartz. This was done in order to avoid the problem of variations due to mineral composition and grain size distributions. It was hoped that this would insure a greater uniformity of test results. In addition, the shear test results derived from lab-produced quartz samples were compared to those of natural field samples in order to determine whether the behavior observed during lab tests was representative of natural field soils. These experiments demonstrated that the strength of a cohesionless material increases with degree of angularity and relative density to an optimum point. Surpassing the optimum value implies substantial particle crushing which reduces the particle interlocking effect and can result in a reduction of soil strength. Crushing is greatest when cohesionless particles are poorly graded, highly angular, and large in size. Generally, the degree of particle crushing influences strength, and particle shape determines the degree of crushing. Shape (angularity), therefore, significantly controls the overall strength of a cohesionless soil.
Download or read book Effects of Grain Size Distribution on Dynamic Properties of Granular Soils at Small Strains written by Houman Makarechi and published by . This book was released on 1981 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Combined Effect of Particle Shape and Grain Size Distribution on the Critical State Parameters of Coarse grained Soils written by Ammar Mohammed Alshammari and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle shape and grain size distribution (GSD) control the mechanical response of coarse-grained soils. Based on that, several researchers have sought the link between coarse-grained soils' intrinsic properties (e.g., GSD, and particles' roughness, roundness, and aspect ratio) and the mechanical response (e.g., stiffness and strength). Unfortunately, those studies investigate the effects of particle shape descriptors and GSD on the mechanical response of coarse-grained soils separately. However, both sets of parameters are required to fully capture the mechanical behavior of the coarse-grained soils.We implemented a systematic experimental study to assess the combined effect of particle shape (i.e., roundness) and GSD on the parameters that control the critical state line in coarse-grained particles. In this regard, we evaluated the particulate material response within the critical state soil mechanics model because it is a robust framework that captures particulate materials' ultimate volumetric and shear strength response. Furthermore, the critical state soil mechanics model should be adopted while designing safe geotechnical engineering structures, as recent infrastructure failures have shown (Jefferies, 2022). We tested fifty-six mixtures made of mono-sized, bi-sizes, and poly-sized glass beads and crushed glass particles. These mixtures permit studying the combined effect of particle shape and GSD on critical state parameters. To assess the critical state friction angle, 0́Ø We deployed a rotating cylinder to capture the angle of repose of failing particulate material. 0́Ø We developed a new algorithm to systematically analyze digital images and measure particulate material's angle of repose and the void ratio at failure. The repose angle mimics the critical state friction angle of particulate materials. While for testing the critical state void ratio, 0́Ø We modified the simple method proposed by Santamarina and Cho (2001) to evaluate the critical state parameters on the void ratio-vs.-the log of the mean effective stress space. The significant advantage of our methodology is that it allows the systematic and straightforward evaluation of the effect intrinsic properties of the tested materials at low applied effective stresses to avoid particle breakage. In addition, our modifications improved the quality of the collected data. Results show that the particle shape of the small-size fractions significantly influences the critical state parameters more than the coarse-grained fractions. However, the interaction of the particle shape on different size fractions is complex. For example, the intercept of the critical state line on the compressional plane is affected by the GSD and particle shapes of both the large-size and small-size fractions. Furthermore, the results appear to be controlled by the particle shape of the large-size fractions when the small-size fractions do not fill all the void spaces left by the large-size particles. In contrast, the particle shape of the small-size fraction controls the critical state parameters when small particles fill all voids. Based on the experimental observations, interpretation, and analyses, we proposed calculating the equivalent roundness of mixtures based on the surface area. This equivalent roundness correlates well with the critical state parameters. Furthermore, the correlations provide a greater coefficient of correlations when functions include both roundness (i.e., a measure of particle shape) and coefficient of curvature (i.e., a measure of GSD). The proposed correlations allow estimating all the critical state parameters based on intrinsic properties of the coarse-grained soils' particles.
Download or read book Effects of Grain Size Distribution on Dynamic Properties and Liquefaction Potential of Granular Soils written by Nien-Yin Chang and published by . This book was released on 1982 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spring Meeting written by American Geophysical Union. Meeting and published by . This book was released on 1998 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transportation Research Record written by National Research Council (U.S.). Transportation Research Board and published by . This book was released on 1974 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Geotechnical Investigation and Design Tables written by Burt G. Look and published by CRC Press. This book was released on 2007-04-26 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical handbook of properties for soils and rock contains, in a concise tabular format, the key issues relevant to geotechnical investigations, assessments and designs in common practice. In addition, there are brief notes on the application of the tables. These data tables are compiled for experienced geotechnical professionals who require a reference document to access key information. There is an extensive database of correlations for different applications. The book should provide a useful bridge between soil and rock mechanics theory and its application to practical engineering solutions. The initial chapters deal with the planning of the geotechnical investigation, the classification of the soil and rock properties and some of the more used testing is then covered. Later chapters show the reliability and correlations that are used to convert that data in the interpretative and assessment phase of the project. The final chapters apply some of these concepts to geotechnical design. This book is intended primarily for practicing geotechnical engineers working in investigation, assessment and design, but should provide a useful supplement for postgraduate courses.
Download or read book Evaluation of Soil and Rock Properties written by P. J. Sabatini and published by . This book was released on 2004-10-01 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document presents state-of-the-practice information on the evaluation of soil and rock properties for geotechnical design applications. This document addresses the entire range of materials potentially encountered in highway engineering practice, from soft clay to intact rock and variations of materials that fall between these two extremes. Information is presented on parameters measured, evaluation of data quality, and interpretation of properties for conventional soil and rock laboratory testing, as well as in situ devices such as field vane testing, cone penetration testing, dilatometer, pressuremeter, and borehole jack. This document provides the design engineer with information that can be used to develop a rationale for accepting or rejecting data and for resolving inconsistencies between data provided by different laboratories and field tests. This document also includes information on: (1) the use of Geographical Information Systems (GIS) and Personal Data Assistance devices for the collection and interpretation of subsurface information; (2) quantitative measures for evaluating disturbance of laboratory soil samples; and (3) the use of measurements from geophysical testing techniques to obtain information on the modulus of soil. Also included are chapters on evaluating properties of special soil materials (e.g., loess, cemented sands, peats and organic soils, etc.) and the use of statistical information in evaluating anomalous data and obtaining design values for soil and rock properties. An appendix of three detailed soil and rock property selection examples is provided which illustrate the application of the methods described in the document.
Download or read book Catastrophic Landslides written by Stephen G. Evans and published by Geological Society of America. This book was released on 2002-01-01 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume documents advances in our knowledge of catastrophic landslides, providing a worldwide survey of catastrophic landslide events. It draws on South America to illustrate dramatically the impact of these phenomena on human populations. The occurrence of catastrophic landslides, including site-specific insights, is shown through six events of the past 20 years. Several other chapters focus on the mechanisms involved with catastrophic landsides both in relation to geologic factors in a particular geographic area as well as to specific geologic processes.
