Spelling suggestions: "subject:"dilatometry.""
1 |
An evaluation of the flat dilatometer as an insitu testing deviceMcPherson, Ian Duncan January 1985 (has links)
The results from the use of the dilatometer (Marchetti 1975, 1980) at 4 sites in British Columbia are presented. Comparisons are drawn between the dilatometer and other insitu test devices, including the piezo-friction cone, self-boring and Menard pressuremeters and field vane. Soils tested included saturated deltaic deposits, a sensitive plastic clay and a saturated, hydraulically placed fill.
Overall the dilatometer proved to be an extremely effective device. It had a low capital cost, required a minimum of support equipment and was simple to use. The data was repeatable and easily reduced using a computer programme. Computer output, both graphical and tabular, is easily amenable to interpretation to an engineer in the field.
For the most part the results in this thesis support Marchetti's empirical correlations with the following exceptions:
( i) determination of K0 in sands,
( ii) determination of a deformation modulus in clay,
and
(iii) in overconsolidated silts where it is believed that abnormal pore pressures caused the empirical correlations to breakdown.
The dilatometer is an insitu, total stress, penetration device which cannot be analysed in a fundamental manner. Elastic theory is inapplicable because of plastic straining during blade penetration and probably during membrane expansion. To more critically evaluate the dilatometer, the author designed an electronic research device with exactly the same external dimensions as Marchetti's dilatometer. The aim of the electronic dilatometer is to greatly improve understanding of the simple Marchetti dilatometer by allowing:
( i) a better understanding of the operational characteristics of Marchetti's dilatometer,
( ii) direct measurement of stress on, and deformation of, the membrane,
(iii) measurement of pore water pressure before and after halting penetration and during membrane expansion, and ( iv) measurement of the pushing force on the blade. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate
|
2 |
A modified flat dilatometer for field measurement of non-linear soil behaviour at small strains /Chiu, Chung-fai. January 1996 (has links)
Thesis (M. Phil.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 102-106).
|
3 |
A modified flat dilatometer for field measurement of non-linear soil behaviour at small strains趙仲輝, Chiu, Chung-fai. January 1996 (has links)
published_or_final_version / Civil and Structural Engineering / Master / Master of Philosophy
|
4 |
Rational framework for interpreting overconsolidation ratio, undrained strength ratio, and lateral stress coefficient from flat dilatometer tests in clayPool, Randal Gleason 05 1900 (has links)
No description available.
|
5 |
Volume-temperature relationships in aqueous systems.Neal, Jack Laurance. January 1968 (has links)
No description available.
|
6 |
Experimental study of a modified flat dilatometer under plane strain condition /Udakara, Deepthi De Silva. January 2000 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 89-98).
|
7 |
Volume-temperature relationships in aqueous systems.Neal, Jack Laurance. January 1968 (has links)
No description available.
|
8 |
An evaluation of seismic flat dilatometer and lateral stress seismic piezoconeRivera Cruz, Ivan 05 1900 (has links)
The flat dilatometer (DMT) and piezocone penetration (CPTU) tests are likely to be among the most
widely used in situ testing methods for soil characterization and indirect determination of geotechnical
design parameters such as: strength, stiffness, permeability and compressibility. The flat dilatometer has
proved to be a reliable, robust and adaptable tool, and the data obtained with this instrument is very
repeatable, and easy to reduce and process. Furthermore, the addition of a seismic module to the standard
flat dilatometer (SDMT) to measure the shear wave velocity (Vs) significantly complements the set of
data typically obtained with a standard DMT test. Nonetheless, the experience in interpreting the
combination between Vs and DMT data is fairly limited due to the recent introduction of the SDMT for
commercial applications. Additionally, the estimation of the coefficient of earth pressure at rest (K₀) has
been the most important application of the DMT since its introduction. However, a potential weakness of
the DMT is that the derivation of K₀ is based upon empirical correlations developed some time ago and
neither improvement work nor upgrade of these approaches has been performed in the last 10 years.
Throughout the years several additional sensors have been developed in order to supplement the data
collected with the CPTU test. Among the wide variety of sensor developed, the lateral stress module
mounted behind a piezocone represents a promising tool for estimation of in situ lateral stress conditions
from the interpretation of lateral stress penetration data. However, the popularity of the so called lateral
stress cone has declined over the years due to constraints in both the instrumentation and the
interpretation of measured data. Also, the application of this instrument remains limited to specific soils
conditions and specific projects. However, the valuable experience gained throughout the years in the
development and application of several lateral stress cones in combination with developments in
electronics and understanding of soil behaviour allow the improvement of this type of technology.
This thesis presents the results of a comprehensive laboratory and field testing programs performed by the
author at several research sites located in the Lower Mainland of BC, undertaken in order to assess the
performance of the seismic flat dilatometer and lateral stress seismic piezocone (LSSCPTU), built and
develop at UBC. Firstly, the analysis of field measurements with the SDMT collected at several sites have
demonstrated the potential for an improved soil characterization through the combination of DMT
parameters and the small strain shear modulus (G₀). Additionally the usefulness of the DMT-C closing
pressure for soil identification is shown. On the basis of several relationships identified from this data, a
new soil type behaviour system based upon SDMT measurements is proposed. Furthermore, empirical
correlations based upon fairly large and updated databases have been developed to estimate K₀ and Vs
values from DMT parameters.
|
9 |
A new mineralogical approach to predict coefficient of thermal expansion of aggregate and concreteNeekhra, Siddharth 17 February 2005 (has links)
A new mineralogical approach is introduced to predict aggregate and concrete coefficient
of thermal expansion (CoTE). Basically, a modeling approach is suggested based on the
assumption that the CoTE of aggregate and concrete can be predicted from the CoTE of
their constituent components. Volume percentage, CoTE and elastic modulus of each
constituent mineral phase are considered as input for the aggregate CoTE model, whereas
the same properties for coarse aggregate and mortar are considered for the concrete CoTE
model. Methods have been formulated to calculate the mineral volume percentage from
bulk chemical analysis for different type of rocks commonly used as aggregates in Texas.
The dilatometer testing method has been established to measure the CoTE of aggregate,
pure minerals, and concrete. Calculated aggregate CoTE, based on the determined CoTE
of pure minerals and their respective calculated volume percentages, shows a good
resemblance with the measured aggregate CoTE by dilatometer. Similarly, predicted
concrete CoTE, based on the calculated CoTE of aggregate and mortar and their
respective volume percentages compares well with the measured concrete CoTE by
dilatometer. Such a favorable comparison between predicted and measured CoTE
provided a basis to establish the composite model to predict aggregate and concrete
CoTE. Composite modeling will be useful to serve as a check of aggregate source
variability in terms of quality control measures and improved design and quality control
measures of concrete.
|
10 |
Experimental study of a modified flat dilatometer under plane strain conditionUdakara, Deepthi De Silva January 2000 (has links)
published_or_final_version / abstract / toc / Civil Engineering / Doctoral / Doctor of Philosophy
|
Page generated in 0.0666 seconds