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UBC Theses and Dissertations
Development of a gamma logger to work in conjunction with the CPT for geotechnical and environmental applications Singha, Sandeep
Abstract
The piezocone (CPTU) is a commonly used instrument to assess soil parameters and soil type in geotechnical investigations. However, it is sometimes difficult to distinguish between two soil types that are only subtly different such as fine sand and silty sand with the CPTU. In these cases an alternate method of determining soil type may be required. In order to assess soil type, we may measure the fines content of the soil. One method of assessing fines content within a soil is to measure the natural gamma radiation decay for the common clay mineral constituents potassium and thorium. A gamma logging module has been developed that fits the aforementioned cone penetrometer and records natural gamma data while the CPTU is performed. This test has been labelled the Gamma Cone Penetration Test(GCPT). Since emitted gamma radiation increases with increasing fines content, the instrument can be used to qualitatively distinguish soil type and fines content based on local correlations. Another application of the GCPT is for the measurement of insitu soil density. The back scatter from a module containing a small Cesium source mounted below the GCPT can be correlated to soil density. The GCPT also has environmental applications. It can be used locate radioactive contamination based on a gross gamma count log. Once the contamination is located, the GCPT can measure the gamma energy spectrum in order to identify the radioactive isotope. Since the GCPT is a penetration tool, there are no drill cuttings brought to the surface and worker exposure to potentially hazardous radiation is minimized.
Item Metadata
Title |
Development of a gamma logger to work in conjunction with the CPT for geotechnical and environmental applications
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1997
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Description |
The piezocone (CPTU) is a commonly used instrument to assess
soil parameters and soil type in geotechnical investigations.
However, it is sometimes difficult to distinguish between two
soil types that are only subtly different such as fine sand and
silty sand with the CPTU. In these cases an alternate method
of determining soil type may be required. In order to assess
soil type, we may measure the fines content of the soil. One
method of assessing fines content within a soil is to measure
the natural gamma radiation decay for the common clay mineral
constituents potassium and thorium. A gamma logging module has
been developed that fits the aforementioned cone penetrometer
and records natural gamma data while the CPTU is performed.
This test has been labelled the Gamma Cone Penetration
Test(GCPT). Since emitted gamma radiation increases with
increasing fines content, the instrument can be used to
qualitatively distinguish soil type and fines content based on
local correlations.
Another application of the GCPT is for the measurement of insitu
soil density. The back scatter from a module containing a small
Cesium source mounted below the GCPT can be correlated to soil
density. The GCPT also has environmental applications. It can be used
locate radioactive contamination based on a gross gamma count
log. Once the contamination is located, the GCPT can measure
the gamma energy spectrum in order to identify the radioactive
isotope. Since the GCPT is a penetration tool, there are no
drill cuttings brought to the surface and worker exposure to
potentially hazardous radiation is minimized.
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Extent |
4043011 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-05-28
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0050189
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1998-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.