Download or read book The Family of Compaction Curves for Fine grained Soils and Their Engineering Behaviors written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Equation for Complete Compaction Curve of Fine grained Soils and Its Applications written by DC. Sego and published by . This book was released on 2000 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete compaction curve for fine-grained soil and its characteristics are discussed. The formulation of the relationship to model the curve is introduced. The equation is versatile in its ability to quantify the shape, size and position of compaction curves. It is capable of describing the compaction curve from the dry to very wet condition and can be used to predict a family of compaction curves for a given soil for different input of compaction energies. All parameters in the equation have specific physical definitions. Simple procedures to obtain all parameters directly from a standard compaction curve are developed and described in detail. The examples show that the proposed equation is good at representing the soil compaction curve and demonstrates excellent agreement between laboratory test data and the predicted curves. The family of curves predicted by the equation would improve the practice of the one-point method in the field.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Compaction and Water Retention Characteristics of Champlain Sea Clay written by M. Cevat Catana and published by . This book was released on 2006 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modified Ohio s Curves written by Suksun Horpibulsuk and published by . This book was released on 2009 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compaction curves from 16 coarse- and 9 fine-grained soils, which cover all soil types classified by the Unified Soil Classification System are analyzed to develop the Modified Ohio's curves. For all soils, the relationships between water content and degree of saturation on both the dry and the wet sides of optimum are represented by power functions. Their compaction curves under standard Proctor energy follow the Ohio's curves. Optimum degree of saturation, ODS, of coarse-grained soils is lower than that of fine-grained soils. However, for a given soil, the ODS is practically the same for different compaction energies, E. Even though compaction characteristics (optimum water content, OWC, and maximum dry unit weight, ?d max) are different for different soils, their relationship between normalized OWC/OWCst and E is practically the same, where OWCst is the OWC at standard Proctor energy. Based on this finding, the Modified Ohio's curves are introduced under compaction energy levels of the half standard, half modified, and modified Proctor energies. The verification of the Modified Ohio's curve is also illustrated in this paper. These curves are useful in rapid estimation of laboratory compaction curves from a single set data of dry unit weight and water content.

Download or read book Compaction Characteristics of Fine Grained Soils written by Lewis Clyburn Sowell and published by . This book was released on 1964 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Static Method to Determine Compaction Characteristics of Fine Grained Soils written by B. Sharma and published by . This book was released on 2016 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering projects such as roads, earthen dams, embankments, and trench backfills require soil compacted at higher dry unit weight. In a majority of geotechnical projects, compaction of soils is involved with increasing strength and decreasing compressibility and permeability. The Proctor compaction test forms one of the most popular and important tests in geotechnical engineering practice. The moisture content-dry unit weight relationship of the soil obtained from the standard Proctor test forms the basis for specification and field compaction control. Standard Proctor test, also known as the dynamic compaction test requires considerable time and effort and has few imperfections. This study examined the possibility of determining the equivalent static pressure to the standard Proctor test to obtain the optimum moisture content, OMC, and maximum dry unit weight, of fine-grained soils. For this, a static compaction pressure test was devised in the Proctor mold itself to statically compact the soil at different water contents. The equivalent static pressure so determined will simplify the compaction procedure and will also result in considerable saving of time, money, and effort, especially so when dealing with highway and earth embankment projects.

Download or read book Effect of Compaction Energy on the Behaviour of Fine Grained Soils written by Yeşim Gürtuğ and published by . This book was released on 2004 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Compaction Behaviour of Soils written by Nurses Kurucuk and published by . This book was released on 2011 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil compaction is widely applied in geotechnical engineering practice. It is used to maximise the dry density of soils to reduce subsequent settlement under working loads or to reduce the permeability of soils. The durability and stability of structures are highly related to the appropriate compaction achievement. The structural failure of roads and airfields, and the damage caused by foundation settlement can often be traced back to the failure in achieving adequate compaction. For that reason, soil compaction is important for engineering activities involving earthworks. Compacted soils are unsaturated by nature, which includes both air and water within their voids. Thus, unsaturated soil mechanics principles are crucial in understanding the compaction behaviour of soils. There are several qualitative studies, which attempt to explain the compaction behaviour of soils and there is a vast body of literature covering the behaviour of compacted soils. Still, fundamental research on the compaction process is limited. In addition, the current constitutive models available for unsaturated soils assume that the soil state after compaction is the initial state of the soil. However, compacted soils undergo a stress history which influences the post compaction behaviour. Considering these facts, it still remains that the compaction of soil is a complex phenomenon, which is not well explained, particularly from a quantitative sense. Further understanding of the compaction behaviour during the compaction process will provide important insights on the behaviour of compacted soils. The main aim of this research project is to extend the current understanding of the compaction process of soils. The research focuses on three different areas: investigating the experimental behaviour of soils during the static compaction process and obtaining data for compaction modelling; developing a compaction model using the existing constitutive models for unsaturated soils; and evaluating the performance of this model in predicting the compaction behaviour of soils. In the experimental part, static compaction tests were conducted on two different granular soils, sand with 2% and 5% bentonite content by weight. The tests were undertaken on samples with different water contents in order to observe the effect of matric suction on the compaction behaviour. The initial matric suction of the specimens was measured using the null type axis translation technique and the matric suction variations were monitored during the compaction process. It was found that the unsaturated samples were always more compressible than the saturated sample. This finding is contrary to the assumption made in most constitutive models, and thus modelling the compaction behaviour using these models may result in some deficiencies. In addition, in granular soils with low water content the axis translation technique was found to be very time consuming for the suction measurements. This was attributed to the discontinuous water phase within the samples. To develop a compaction model, a volume change constitutive relationship for unsaturated soils, defined in terms of two independent stress variables, was incorporated with pore pressure predictions. The model was developed for undrained, semi-drained and drained loading conditions. Initially, compressibility coefficients in the volume change relationship were considered as constant parameters, i.e., the compressibility of a soil element does not change with increasing vertical stress. Using constant compressibility coefficients, the compaction curve can be predicted only for the wet side of the curve, not the dry side. Thus, variable compressibility coefficients were derived from constitutive models proposed in the literature, and using these coefficients, the well-known shape of the compaction curve was predicted on both dry and wet side of the compaction curve. It was found that the shape of the compaction curve can be the theoretically predicted using unsaturated soil mechanics principles. The main insight gained from the model development was that the influence of matric suction on the material compressibility with respect to net stress is the governing factor determining the inverted parabolic shape of the compaction curve. The performance of the compaction models were examined on their ability to predict the compaction behaviour of soils. Data for four different soils, two sand-bentonite mixtures tested in this study, and Boom clay and Speswhite kaolin data from literature, were used for models evaluation. Two different constitutive modelling approaches were analysed, which are the separate stress state variables approach and combined stress state approach. It was concluded that the samples prepared from initially slurry soils and from initially dry soils could not be treated the same and would require the use of different sets of soil parameters. In addition, the compaction behaviour of soils, prepared from initially dry samples, could only be modelled over a narrow range of water contents using a single set of soil parameters. Minimum two sets of soil parameters are required to model the compaction behaviour over a wide range of water contents with the current constitutive models.

Download or read book Family of Compaction Curves for Chemically Modified Soils written by Radha Krishna Daita and published by . This book was released on 2005-08-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book written by and published by Delene Kvasnicka. This book was released on with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strength and Deformation Characteristics of Compacted Soils Under the Action of Repeated Axial Loads written by Hiram Gordon Larew and published by . This book was released on 1960 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dry soil Compaction Investigation written by William N. Brabston and published by . This book was released on 1987 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objectives of this field study were to investigate means of compacting soils at near-zero water content. Two 125-ft-long test sections were constructed, each consisting of five test items 25 ft long with a 5-ft-deep test bed. In each test section, the first item consisted of 1.5 ft of crushed limestone (GW) over 3.5 ft of bomb-crater debris. The remaining four items consisted of 5 ft of silty clay (ML0, river sand (CL-ML), gravelly sand (SP), and sand tailings (SP), respectively. One test section was compacted with a single drum self-propelled vibratory roller and the other with a towed four-sided impact single drum sel-propelled vibratory roller and the other with a towed four-sided impact roller. Test results were not fully conclusive because of the difficulty in drying soils with fines, rotational slippage of the impact roller during testing, and precompaction of the soils in the vibratory roller test section during construction. However, it could be concluded that (a) compaction at low water content was feasible primarily with soils with few fines, (b) significant difficulty would be experienced in field-drying soils with high fines content, (c) both compactors generally gave acceptable results, but the rate of compaction of the impact roller was much higher than that of the vibratory roller, and (d) test results warranted further investigation of compaction with the impact roller.

Download or read book Effect of Plasticity and Initial Compaction Conditions on Soil Water Characteristics Curve of Fine grained Soils written by Sanjeev Regmi and published by . This book was released on 2019 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Constructing and Controlling Compaction of Earth Fills written by Donald W. Shanklin and published by ASTM International. This book was released on 2000 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Presents 22 papers, from the July 1999 symposium, written on the use of various standardized methods for specifying and controlling the compaction of soil for engineered constructed earth fills. Perspectives include the historical background, current state-of-the- art practices, case histories of challenging situations, concerns regarding appropriate design parameters for compaction control, and new methods to evaluate soil compaction and related qualities. Annotation copyrighted by Book News, Inc., Portland, OR.

Download or read book Technical Manual written by United States Department of the Army and published by . This book was released on 1971 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: