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Tensile Testing Of Soils
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Book Synopsis Tensile Testing of Soils by : Mosaid M. Al-Hussaini
Download or read book Tensile Testing of Soils written by Mosaid M. Al-Hussaini and published by . This book was released on 1973 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tensile stresses may exist in many engineering structures, such as rigid and flexible pavements, and within dams and embankments. The existence of tensile stresses in these structures is not harmful; however, these stresses generate tensile strains and if the failure tensile strain is exceeded, the integrity of the structure might be threatened. Most previous research concerned with the behavior of materials under tensile stress has been conducted on brittle materials, such as concrete and rock, while materials such as soils have received little or no attention. Three factors can be considered as the major contributors to this neglect: (a) stability analysis and design practice assume soil to resist compression and shear only, (b) lack of adequate theory which can describe soil behavior under tension with reasonable accuracy, and (c) reliable testing devices which can impose and measure tensile stress and strain have not yet been developed. While information on the tensile behavior of soils is lacking, there exists a relatively large amount of data on the tensile strength of brittle materials as discussed in this report. (Modified author abstract).
Book Synopsis Uniaxial Tensile Test for Soil by : Daniel A. Leavell
Download or read book Uniaxial Tensile Test for Soil written by Daniel A. Leavell and published by . This book was released on 1987 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laboratory Testing of Soils, Rocks, and Aggregates by : Nagaratnam Sivakugan
Download or read book Laboratory Testing of Soils, Rocks, and Aggregates written by Nagaratnam Sivakugan and published by J. Ross Publishing. This book was released on 2011 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains virtually all current laboratory tests for soils, rocks and aggregates in one volume with references to international standards: ASTM, ISRM, BS, and AS.
Book Synopsis Investigation of Tensile Testing of Compacted Soils by : Mosaid M. Al-Hussaini
Download or read book Investigation of Tensile Testing of Compacted Soils written by Mosaid M. Al-Hussaini and published by . This book was released on 1974 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation reported herein describes the development of a hollow cylinder testing device and an indirect tensile testing device and the feasibility of using this equipment for determining the tensile properties of compacted cohesive soils. Hollow cylinder, indirect tensile, and double punch tests were conducted on compacted specimens of Vicksburg buckshot clay (CH), Vicksburg lean clay (CL), and a sandy clay mixture (SC) from Degray Dam. Unconfined compression tests were also conducted to provide comparative compressive properties of the materials. The test results showed that hollow cylinder tests produce the highest measured tensile strengths of comparable specimens, followed in decreasing order by indirect tensile and double punch tests, and that tensile strength increases as the plasticity of the soil increases. (Modified author abstract).
Book Synopsis Experimental Unsaturated Soil Mechanics by : Tom Schanz
Download or read book Experimental Unsaturated Soil Mechanics written by Tom Schanz and published by Springer Science & Business Media. This book was released on 2007-06-02 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings are a continuation of the series of International Conferences in Germany entitled "Mechanics of Unsaturated Soils." The objective is to discuss and understand unsaturated soil behaviour, so that engineered activities are improved in terms of judgement and quality. In addition to knowledge of classical concepts, it is a challenge to adapt convincing new concepts and present them in such a way that they can be used in engineering practices.
Book Synopsis Theoretical Aspects and Measurement of Tensile Strength in Unsaturated Soils by : Victor Abram Snyder
Download or read book Theoretical Aspects and Measurement of Tensile Strength in Unsaturated Soils written by Victor Abram Snyder and published by . This book was released on 1980 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Foundations & Earth Structures written by and published by . This book was released on 1986 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Method for Testing Tensile Strength in Unsaturated Soils by : GX. Tang
Download or read book A Method for Testing Tensile Strength in Unsaturated Soils written by GX. Tang and published by . This book was released on 2000 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents a new method for testing tensile strength in unsaturated soils. A rigid tensile mold has been designed and simple testing procedures developed. A series of tension tests has been carried out on densely compacted unsaturated soil specimens to evaluate the method. The material tested in this study was a highly plastic 50:50 (by dry weight) mixture of sand and Na-rich bentonite. Cylindrical specimens were the same size and shape as those used for triaxial tests.
Book Synopsis Investigation of Tensile Testing of Compacted Soils by : Mosaid M. Al-Hussaini
Download or read book Investigation of Tensile Testing of Compacted Soils written by Mosaid M. Al-Hussaini and published by . This book was released on 1974 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamic Geotechnical Testing by : M. L. Silver
Download or read book Dynamic Geotechnical Testing written by M. L. Silver and published by ASTM International. This book was released on 1978 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigating the Tensile Behaviour of Unsaturated Soils Using the Brazilian Disc Test by : Tiago Alexandre Valentim Gaspar
Download or read book Investigating the Tensile Behaviour of Unsaturated Soils Using the Brazilian Disc Test written by Tiago Alexandre Valentim Gaspar and published by . This book was released on 2017 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: In geotechnical practice, soils are generally assumed to have negligible tensile strength. However, in the context of unsaturated soils, this strength can be significant and important to consider. In contrast to the two-phase soil matrix considered in classical saturated soil mechanics, the presence of a third air phase in unsaturated soils brings about the manifestation of surface tension and matric suction. These phenomena provide unsaturated soils with a certain degree of tensile strength, which in turn affects the overall shear strength behaviour of the soil mass. This dissertation investigates the behaviour of three different unsaturated soils tested using the Brazilian Disc Test (BDT). The soils considered were two types of tailings from South African mines, i.e. gold and iron tailings, and one natural silty, clayey soil from Centurion, south of Pretoria. The tensile strength of 120 samples was determined using displacement controlled Brazilian Disc Tests with sample deformation recorded using Digital Image Correlation (DIC). Through the use of 30° curved loading strips, the BDT was found to consistently result in centrally located crack initiation by reducing compressive stress concentrations close to the points of load application. This modification of the loading conditions prevented the premature ‘crushing’ failures observed by previous authors. It was found that while the testing procedure was suitable for all soils considered, the increased ductility at high moisture contents resulted in a more complex material response upon loading. For these ductile samples, it was found that simply adopting the maximum achieved load as being indicative of the mobilisation of tensile strength is inadequate and can result in a gross overestimation of the tensile strength of these soils. The tensile strengths measured for each soil type, across a range of moisture contents, were subsequently compared to the Soil Water Retention Curves (SWRC) of each material. This comparison allowed for correlations between matric suction and tensile strength to be determined. For both gold and iron tailings, an increase in tensile strength was observed with an increase in suction. The contribution of matric suction to tensile strength was however found to diminish in the pendular regime. In contrast, the tensile strength of the Centurion soil increased with a reduction in saturation, achieved a peak value and decreased in the pendular regime. This trend was attributed to the dependency of both surface tension and matric suction on the contact area between particles, which in turn is affected by particle shape.
Book Synopsis Laboratory Tests for Unsaturated Soils by : Eng-Choon Leong
Download or read book Laboratory Tests for Unsaturated Soils written by Eng-Choon Leong and published by CRC Press. This book was released on 2023-02-16 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The testing of unsaturated soils requires greater care and effort than that of saturated soils. Although unsaturated soil mechanics has been embraced by geotechnical engineering, engineering practice has not yet caught up as the characterization of unsaturated soils is difficult and time-consuming, and made harder still by a lack of standards. Laboratory Tests for Unsaturated Soils collates test procedures to cover all laboratory tests for characterising unsaturated soils. It covers the background, theory, test procedures, and interpretation of test results. Each test procedure is broken down into simple stages and described in detail. The pitfalls of each test and the interpretation of the test results are explained. Test data and calculation methods are given, along with many numerical examples to illustrate the methods of interpretation and to offer the presentation of typical results. The book is especially useful for students and researchers who are new to the field and provides a practical handbook for engineering applications.
Book Synopsis Tensile Strength of Unsaturated Soils by : Penghai Yin
Download or read book Tensile Strength of Unsaturated Soils written by Penghai Yin and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Desiccation-induced soil cracking is of significant interest in several engineering disciplines, which include geotechnical and geoenvironmental engineering, mining engineering, and agriculture engineering. The hydraulic, mechanical, thermal and other physico-chemical properties of unsaturated soils can be predominantly influenced due to cracks. Reliable information of these properties is required for the rational design and maintenance of earth structures taking account of the influence the soil-atmosphere interactions (e.g., for expansive soil slopes, earth dams, and embankments). In spite of significant research studies published in the literature on the desiccation-induced cracks during the past century, the fundamental mechanism of crack initiation and propagation of soils induced by drying and shrinkage is still elusive. For this reason, the focus of this thesis is directed towards understanding the tensile strength of unsaturated soils which is associated with soil crack initiation criterion (i.e. maximum tensile stress criterion). Tensile strength is the key property of soils for interpreting the initiation of soil cracking from a macroscopic point of view. A semi-empirical model is proposed for predicting the tensile strength of unsaturated cohesionless soils taking into account the effect of both the negative pore-water pressure in saturated pores and the air-water interfacial surface tension in unsaturated pores. The proposed model is calibrated and validated by providing comparisons between the model predictions and the experimental measurements on 10 cohesionless soils (i.e. five sandy soils and five silty soils) published in the literature. The proposed model is simple and requires only the information of Soil-Water Characteristic Curve (SWCC) and Grain Size Distribution curve (GSD), which can be obtained from conventional laboratory tests. To investigate the influence of microstructure, a practical and reliable estimation approach for predicting the evolution of the microstructural void ratio of compacted clayey soils subjected to wetting and drying paths is proposed. The microstructural evolution of 13 examined soils were investigated quantitatively using the mercury intrusion porosimetry (MIP) results. The investigated soils include four high-plasticity clays, eight low-plasticity clays and a glacial till which is a relatively coarse-grained soil with some fines. Based on this study, a novel criterion has been developed for identifying different pore populations of compacted clayey soils. The "as-compacted state line" (ACSL) was proposed to estimate the initial microstructural void ratio based on the compaction water ratio. A constitutive stress is derived to interpret and predict the volumetric deformation of compacted clay aggregates. The linear elastic constitutive model is used for predicting the microstructural void ratio of the examined compacted soils following monotonic wetting and drying paths. The developed approach (i.e. the ACSL and the linear elastic constitutive model) is validated by providing comparisons between the predicted and interpreted microstructural void ratios for all the examined soils. In addition to the matric suction and microstructure, the confining pressure also influences the tensile strength of unsaturated compacted clayey soils. The tensile strength tests on a compacted clayey soil by both the direct method (i.e. triaxial tensile test) and the indirect method (i.e. Brazilian split test) were performed. It is found that the tensile strength increases as the compaction water content decreases for the range investigated in this study, which could be explained by the variation of the inter-aggregated capillary bonding force and the change in microstructure. The increase in the confining pressure has been found to induce the change in failure mode (i.e. from pure tensile failure mode to combined tensile-shear failure mode). In spite of limitations associated with the Brazilian split test, tensile strength is widely determined using this test due to the simple procedure of specimen preparation and wide availability of test equipment in conventional laboratories. However, the Brazilian tensile strength is found to overestimate the tensile strength of compacted specimens with water content greater than the plastic limit. This is due to the considerable plastic deformation associated with the ductile failure instead of brittle failure. In summary, this thesis is devoted to providing insight into the fundamental mechanisms associated with the desiccation-induced crack initiation by quantitatively investigating the various factors that influence the tensile strength of unsaturated soils, which include the matric suction, the microstructure, and the confining pressure from theoretical studies and laboratory investigations.
Book Synopsis Soil Stabilization: A Durability Test for Stabilized Soils by : Anwar E. Z. Wissa
Download or read book Soil Stabilization: A Durability Test for Stabilized Soils written by Anwar E. Z. Wissa and published by . This book was released on 1969 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes and evaluates a new testing procedure for determining the surface durability of stabilized soils by measuring the change in tensile strength at the surface of test specimens (slabs) subjected to laboratory cycles of weathering. This test, called the Durability Tensile Test, is shown to be potentially a more direct and reproducible method than the standard ASTM Durability Test for evaluating stabilized soils. A prototype apparatus has been constructed to measure the surface tensile strength over approximately 4.0 sq cm circular areas of a 5-inch-square slab, one inch thick. Preliminary tests on three slabs show that the measured strength is related to the effective cohesion of the soil system. For example, increases in curing or dry density which result in an increase in effective cohesion also produce an increase in measured tensile strength. Weathering cycles which have been shown elsewhere to cause a loss in effective cohesion, also result in a loss in tensile strength. Therefore the Durability Tensile Test appears to be a rational method of evaluating durability characteristics. Based on the experience obtained with the prototype apparatus, a modified version is recommended to improve reproducibility and to simplify the testing procedure. (Author).
Book Synopsis The Deep Mixing Method by : Coastal Development Institute Tokyo
Download or read book The Deep Mixing Method written by Coastal Development Institute Tokyo and published by CRC Press. This book was released on 2002-01-01 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: A growing population and increasing urbanization over the past century have made it difficult to locate suitable ground for siting infrastructures in densely populated areas. The Deep Mixing Method (DMM) was developed and put into practice in Japan in 1975 to cope with the headaches of stability and/or excessive settlement in soft soil areas. This method involves using cement and/or lime as a soil stabilizer, added in-situ to deep soils, and has now been adopted not only in Japan but in the USA and other parts of the world as well. This book presents properties of this treated soil method, its various applications, its design and execution, and accumulated research results over the last twenty-five years.
Book Synopsis Correlations of Soil and Rock Properties in Geotechnical Engineering by : Jay Ameratunga
Download or read book Correlations of Soil and Rock Properties in Geotechnical Engineering written by Jay Ameratunga and published by Springer. This book was released on 2015-12-11 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a one-stop reference to the empirical correlations used extensively in geotechnical engineering. Empirical correlations play a key role in geotechnical engineering designs and analysis. Laboratory and in situ testing of soils can add significant cost to a civil engineering project. By using appropriate empirical correlations, it is possible to derive many design parameters, thus limiting our reliance on these soil tests. The authors have decades of experience in geotechnical engineering, as professional engineers or researchers. The objective of this book is to present a critical evaluation of a wide range of empirical correlations reported in the literature, along with typical values of soil parameters, in the light of their experience and knowledge. This book will be a one-stop-shop for the practising professionals, geotechnical researchers and academics looking for specific correlations for estimating certain geotechnical parameters. The empirical correlations in the forms of equations and charts and typical values are collated from extensive literature review, and from the authors' database.
Book Synopsis Soil Stabilization by : Anwar E. Z. Wissa
Download or read book Soil Stabilization written by Anwar E. Z. Wissa and published by . This book was released on 1969 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
