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Author: TD. Smith Publisher: ISBN: Category : Collapsible soil Languages : en Pages : 5
Book Description
An introduction to soil mechanics limitations, testing concerns, and deposition of collapsible soil from the arid western states in the U.S. is presented. Laboratory evaluation of their properties for routine foundation engineering bearing capacity and settlement is of limited use. In situ testing is shown to be practical and successful in a wide range of soil types from uniform fine-grained soils to silty-sandy gravels. The hydraulic, monocell, prebored pressuremeter is proposed as an in situ test to establish dry, wet, and dry-wet geotechnical parameters for design by three testing procedures. Each procedure is given a detailed description, typical results are presented for collapsible debris fan deposits, and application of the procedures to routine foundation design is discussed. Simple collapse categories are introduced based on the pressurementer stiffness change from dry to wet conditions. Two minor modifications to the commercial pressuremeter probe end shoe and top support collar are recommended to ensure uniform radial water migration. Estimates of the depth of collapse from subsurface soil beneath existing foundations undergoing excessive settlement are also possible.
Author: TD. Smith Publisher: ISBN: Category : Collapsible soil Languages : en Pages : 5
Book Description
An introduction to soil mechanics limitations, testing concerns, and deposition of collapsible soil from the arid western states in the U.S. is presented. Laboratory evaluation of their properties for routine foundation engineering bearing capacity and settlement is of limited use. In situ testing is shown to be practical and successful in a wide range of soil types from uniform fine-grained soils to silty-sandy gravels. The hydraulic, monocell, prebored pressuremeter is proposed as an in situ test to establish dry, wet, and dry-wet geotechnical parameters for design by three testing procedures. Each procedure is given a detailed description, typical results are presented for collapsible debris fan deposits, and application of the procedures to routine foundation design is discussed. Simple collapse categories are introduced based on the pressurementer stiffness change from dry to wet conditions. Two minor modifications to the commercial pressuremeter probe end shoe and top support collar are recommended to ensure uniform radial water migration. Estimates of the depth of collapse from subsurface soil beneath existing foundations undergoing excessive settlement are also possible.
Author: Jean-Louis Briaud Publisher: Routledge ISBN: 1351409484 Category : Technology & Engineering Languages : en Pages : 480
Book Description
This classic title deals presents all one needs to know about pressuremeter test, a soil and rock test used in civil engineering. It consists of placing a cylindrical probe in the ground and expanding the probe to pressurize the soil or the rock horizontally. The pressure on the soil and the relative increase in cavity radius are obtained and give an in situ stress strain curve. The pressuremeter test is repeated at various depths in order to obtain profiles of soil parameters. The design applications of the preboring pressuremeter test include: shallow foundations under vertical loads, deep foundations under vertical and horizontal loads, ground anchors, cantilever drilled shaft walls and anchored bulkheads, pavements, stone columns, ground improvement and compaction control.
Author: Publisher: ISBN: Category : Arid soils Languages : en Pages : 0
Book Description
The arid alluvial deposits common to the western United States frequently undergo moderate to severe collapse when wetted that can threaten or destroy the stability of structures that are founded on such soils. Additionally, in some areas collapse has been known to occur due to overburden stresses alone. As development expands in these areas a method to estimate the degree of this collapse is essential. Current settlement methods are reviewed and evaluated as they apply to collapsible soils, providing a basis for the development of a proposed settlement method for determining collapse. To aid in the determining the basis for the proposed settlement method finite element analyses are conducted to determine if the collapsible silts found near Nephi, Utah are cohesive or frictional in their behavior. The role of the pressuremeter (PMT), an in situ testing device, and its value in determining relevant soil properties for collapse prediction is discussed. Testing methods are presented for dry, wet, and dry/wet combination conditions in the soil. Finite element analyses are conducted to determine the influence zone about the pressuremeter probe and the effects of non-coalescing moisture patterns on PMT test results. A comprehensive evaluation of a field test conducted near Nephi, Utah provides necessary data for the development of the proposed settlement method. A component of settlement particular to collapsible soils is identified and factors that contribute to this component are discussed. The collapse strain, a property of metastable soils that is essential to the proposed settlement method, is defined and methods of determining its value are presented. Making use of the yield strain, loading conditions, and limit pressures of the soil in the dry and wet state methods for determining collapse strain are proposed. Within the collapsible layers zones of collapse that are dependent upon the loading conditions are identified and a method of estimating the height of these zones is proposed. The values determined for collapse strain and the height of the collapse zone are then used to predict the collapse portion of settlement. For the silts tested near Nephi, Utah the proposed method gives results within 5% of the measured average settlements for the loading conditions of overburden alone, existing structures, and structures on wetted collapsible soil. Extrapolation of the data provides a method of determining collapse for embankment loading. The proposed method for predicting average collapse is applied in an example problem making use of a PMT test pair from a debris earth dam in Colorado.
Author: R. J. Mair Publisher: Elsevier ISBN: 1483102254 Category : Technology & Engineering Languages : en Pages : 169
Book Description
Pressuremeter Testing: Methods and Interpretation the history, applications, and development of pressumeter devices and related test procedures. The book covers topics such as the general principles of pressuremeter testing; types of pressuremeters and their installation and calibration; and the estimation of soil from pressuremeter tests in clays, sands, and weak rocks. Also included are topics such as the application of pressuremeter testing to design and research in the improvement of the use of pressuremeters. An appendix is also included; Appendix A covers the analysis of pressuremeter tests, and Appendix B contains guidance notes for the specifications of pressuremeter tests. The text is recommended for engineers and geologists who would like to know more about the applications of the pressuremeter and the interpretation of its results.
Author: B.G. Clarke Publisher: CRC Press ISBN: 9780751400410 Category : Technology & Engineering Languages : en Pages : 386
Book Description
The use of pressuremeters in predicting in situ soil properties is increasing as the technique becomes established as a reliable method of site investigation. This book provides a thorough review of the topic and its use in site investigation.
Author: Gerard Ballivy Publisher: CRC Press ISBN: 9789054105459 Category : Technology & Engineering Languages : en Pages : 512
Book Description
Pressuremeter testing activities are of great interest for scientists and engineers concerned with the mechanical behaviour of civil engineering materials. The proceedings include the first Menard Lecture presented by Professor Branko Ladanyi and 57 technical papers from 16 countries. They are related to the application of pressuremeter testing to granular and alluvial soils, clay, rock, concrete and permafrost, and geotechnical design. It also includes a session on technological developments in the design, fabrication and installation of pressuremeters.
Author: Bujang B.K. Huat Publisher: CRC Press ISBN: 0415457319 Category : Technology & Engineering Languages : en Pages : 562
Book Description
Residual soils are found in many parts of the world. Like other soils, they are used extensively in construction, either to build upon, or as construction material. They are formed when the rate of rock weathering is more rapid than transportation of the weathered particles by e.g., water, gravity and wind, which results in a large share of the soils formed remaining in place. The soils typically retain many of the characteristics of the parent rock. In a tropical region, residual soil layers can be very thick, sometimes extending to hundreds of meters before reaching un-weathered rock. Unlike the more familiar transported sediment soil, the engineering properties and behaviour of tropical residual soils may vary widely from place to place depending upon the rock of origin and the local climate during their formation; and hence are more difficult to predict and model mathematically. Despite their abundance and significance our knowledge and understanding of these soils is not as extensive as that of transported sediment soil. Written by residual soil specialists from various parts of the world, this unique handbook presents data, knowledge and expertise on the subject. It provides insight into the engineering behaviour of tropical residual soils, which will be applicable to small or extensive construction works worldwide on such soils. This book covers almost all aspects of residual soils, from genesis, classification, formation, sampling and testing to behaviour of weakly bonded and unsaturated soil, volume change and shear strength. It features chapters on applications in slopes and foundation, as well as dedicated parts on residual soils in India, Hong Kong and Southeast Asia. A large number of graphs, tables, maps and references throughout the text provide further detail and insight. This volume is intended as a reference guide for practitioners, researchers and advanced students in civil, construction and geological engineering. Unique in its coverage of the subject, it may serve as a standard that benefits every engineer involved in geological, foundation and construction work in tropical residual soils.
Author: José Fernando Thome Jucá Publisher: Taylor & Francis US ISBN: 9789058093721 Category : Science Languages : en Pages : 454
Book Description
Unsaturated materials comprise residua, collapsible and expansive naturally occurring soils, compacted soils and, more recently, residues of solid wastes. The engineering problems associated with unsaturated materials range from those related to conventional geotechnical works (e.g. foundations, pavements, slopes and excavations, retaining structures, earthdams, irrigation canals, tunnelling, compacted embankments) to those included in the environmental area (e.g. natural slope instability, erosion and subsidence processes, tailings, residues or solid waste disposal, contaminant transport, remediation of contaminant sites, engineered barriers for environmental protection, re-use of residues). This book, published in three separate volumes, comprises a selection of selected and invited papers presented at the Third International Conference on Unsaturated Soils – UNSAT ‘2002 – that took place in Recife, Brazil, form 10th to 13th March 2002. The book is of interest to consultants, researchers, practitioners, lecturers and students with a background in geotechnical engineering, environmental engineering and engineering geology.
Author: TD. Smith
Author: TD. Smith
Author: Jean-Louis Briaud
Author: 
Author: R. J. Mair
Author: B.G. Clarke
Author: Gerard Ballivy
Author: Bujang B.K. Huat
Author: J.-L. Briaud
Author: José Fernando Thome Jucá
Author: