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Considerations of soil remoulding and application to sensitivityTang, King Yan. January 1980 (has links)
No description available.
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Applications of cone, vane and vane-cone to predict stress-strain behaviour of unsaturated cohesive soilLiao, Chung-Lon January 1986 (has links)
No description available.
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Bearing capacity and immediate settlement of shallow foundations on clayStrahler, Andrew W. 14 March 2012 (has links)
Shallow foundations are extensively used to support structures of all
sizes and derive their support from near surface soils. Thus, they are typically
embedded up to a few meters into the soil profile. Designers of shallow
foundations are required to meet two limit states: overall failure of the soil
beneath the foundation (bearing capacity) and excessive settlement. Existing
bearing capacity design methods use an assumed shearing plane within the soil
and perfectly plastic soil behavior to estimate the ultimate resistance available.
The immediate settlement of a shallow foundation is typically approximated
using an elasticity-based method that does not account for actual, nonlinear
soil behavior. A load test database was developed from footing load tests
reported in the literature to assess the accuracy and uncertainty in existing
design methodologies for calculating bearing capacity and immediate
settlement. The assessment of uncertainty in bearing capacity and immediate
settlement was accomplished through the application of a hyperbolic bearing
pressure-displacement model, and the adaptation of the Duncan-Chang soil
constitutive model to footing displacements.
The prediction of bearing capacity using the general bearing capacity
formula was compared to the bearing capacity extrapolated from the load test
database using a hyperbolic bearing pressure-displacement model. On average
the general bearing capacity formula under-predicts the bearing capacity and
exhibits a significant amount of variability. The comparison was used to
develop resistance statistics that were implemented to produce resistance
factors for an LRFD based design approach using AASHTO load statistics.
The Duncan-Chang model was adapted to predict bearing pressure displacement
curves for footings in the load test database and used to estimate
governing soil parameters. Bearing pressure-displacement curves fitted to the
observed curves were used to back calculate soil stiffness. The soil stiffness
was used with an elasticity-based displacement prediction method to evaluate
the accuracy of the method. Finally, the back-calculated modulus from the
fitted Duncan-Chang model was used to assess the accuracy and uncertainty
associated with the elasticity-based K-factor, a correlation based stiffness
parameter. In general the comparisons indicate that the current design
procedures over-predict the bearing pressure associated with a given
displacement and exhibit a significant amount of uncertainty. / Graduation date: 2012
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Consolidation, compression, and shear strength of four western Oregon forest soilsMcNabb, David H. 02 April 1990 (has links)
Forest soils with low bulk densities are often considered less
susceptible to compaction than soils with higher bulk densities. The
objective of this study was to determine if soil strength controlled the
compression of soils with low bulk density. Four soils were selected
for this evaluation. Three of these were andic soils with low bulk
density and the fourth soil was a more dense, cohesive soil.
Undisturbed samples of saturated and partly saturated soil were
compressed in a one-dimensional consolidation test apparatus.
Measurements with separate samples were at one of 7 normal stresses
between 0.033 and 1.96 MPa. Shear strength of saturated soil was
measured in direct shear tests. Primary consolidation of saturated
soil was completed in less than one minute at all normal stresses.
Shear stress and bulk density increased continuously during shear
strain. The compression index of the cohesive soil was significantly
larger (p<0.05) than that of the andic soils. The shear strength of
andic soils (average cohesion intercept of 0.016 MPa and friction angle
of 33.3°) was significantly higher (p<0.05) than the cohesive soil
(cohesion intercept of 0.028 MPa and friction angle of 28.9°). When
saturated, the cohesive soil was more compressible than the andic
soils because of lower soil strength. A nonlinear model of soil
compression was developed that accurately predicted the compressed
density of saturated and partly saturated soil as a function of normal
stress, initial bulk density of undisturbed samples, and degree of
saturation. As degree of saturation decreased, the compressibility of
the cohesive soil decreased more rapidly than it did for the andic soils.
As a result, bulk density of dry cohesive soil increased less than it did
for dry andic soils. Differences in the compressibility of soils were
attributed to texture and clay mineralogy. The differences in the
compressibility of these soils were much smaller than were the
differences in bulk density. Decreasing water content affected the
compressibility of the cohesive soil more than it affected the andic
soils. Because soil strength controls the compressibility of these
forest soils regardless of bulk density, it will also determine the
susceptibility of soils to compaction by machines. / Graduation date: 1991
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Development of liquefaction susceptibility and hazard maps for the islands of Jamaica and TrinidadKraft, Jason Edmund 09 April 2013 (has links)
Caribbean nations lie within a zone of distinct seismic hazard. While ground motion in the region has been analyzed, the potential for liquefaction has not been evaluated in most cases. In order to evaluate liquefaction, data describing soil composition, surficial geology, and seismic hazard analyses were collected and applied. This allowed for expansion of previously localized liquefaction analysis to be expanded to the extents of two island nations in the Caribbean.
This thesis utilizes the Youd and Perkins (1978) qualitative liquefaction susceptibility and Holzer et al. (2011) liquefaction probability methodologies to evaluate the possibility of liquefaction in Trinidad and Jamaica during major seismic events. Maps were developed using geographic information system (GIS) data to compare susceptibility and hazard across the islands at varying levels of magnitude. In this way, the distribution of liquefiable deposits is displayed in a manner that can be used quickly and easily to motivate further study of susceptible regions and mitigation activities to reduce the risk posed by liquefaction in the countries.
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Kayma direnç parametrelerinin sismik hızlar ile belirlenmesi /Çekmen, Veysel. Uyanık, Osman. January 2009 (has links) (PDF)
Tez (Yüksek Lisans) - Süleyman Demirel Üniversitesi, Fen Bilimleri Enstitüsü, Jeofizik Mühendisliği Anabilim Dalı, 2009. / Kaynakça var.
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Fundamental shear behavior of saturated loose fills of completely decomposed rocksZhai, Yang., 翟陽. January 2000 (has links)
published_or_final_version / abstract / toc / Civil Engineering / Doctoral / Doctor of Philosophy
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Applications of cone, vane and vane-cone to predict stress-strain behaviour of unsaturated cohesive soilLiao, Chung-Lon January 1986 (has links)
No description available.
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Considerations of soil remoulding and application to sensitivityTang, King Yan. January 1980 (has links)
No description available.
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Investigation of in-situ shear properties of asphalt concrete /Bekheet, Wael January 1900 (has links)
Thesis (Ph. D.)--Carleton University, 2003. / Includes bibliographical references (p. 138-146). Also available in electronic format on the Internet.
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