Soil resistivity measurements to predict moisture content and density in loose and dense soil
In the past, most of the soil electrical resistivity charts were- developed based on stand-alone geomaterial classification with minimal contribution to its relationship to some of geotechnical parameters. Furthermore, the values cited a very wide range of resistivity with sometimes overlapping valu...
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| Main Authors: | , , , , |
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| Format: | Article |
| Published: |
Trans Tech Publications Inc
2013
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| Subjects: | |
| Online Access: | http://www.ttp.net/1660-9336.html http://www.ttp.net/1660-9336.html http://eprints.uthm.edu.my/4084/1/mohd_hazreek.pdf |
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| Summary: | In the past, most of the soil electrical resistivity charts were- developed based on stand-alone
geomaterial classification with minimal contribution to its relationship to some of geotechnical
parameters. Furthermore, the values cited a very wide range of resistivity with sometimes overlapping
values and having little significance to specific soil condition. As a result, it created some ambiguities
during the interpretation of observations which were traditionally based an qualitative anomaly
judgments of experts and experienced people. Hence, this study presents soil resistivity values based
on laboratory experiment with a view to predict the soil moisture content and density in loose and
dense soils. This study used a soil box and a resistivity meter to test a clayey silt sail, increasing its
water usage from 1-3% based on 1500 gram of dry soil. All the moisture contents and density data
were observed concurrently with 25 electrical soil resistance observations being made on the soil All
testing and formula used were In accordance with that specified in BS1377 (1990). It was apparent
that the soil resistivity value was different under loose (L) and compact(C) condition with moisture
content (w) and density (pbulk) correlations being established as follows; pbulk(C)=2.5991p-0.037, pbulk (L)=-0.111 ln(p) + 1.7605, W(L)=109.98p-0.286, and W(C)=121.88p-0.363 with determination
coefficients, R2 that ranged between 0.69 - 0.89. This research therefore contributes a means of
predicting these geotechnical parameters by related persons such as geophysicist, engineers and
geologist who use these resistivity techniques in ground exploration. |
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