Papers by Bhimavarapu Reddy
Physica B: Condensed Matter, 2004
Indian Geotechnical Journal, 2013
Organic soils which pose significant problems to design engineers with its poor compressibility a... more Organic soils which pose significant problems to design engineers with its poor compressibility associated with significantly different properties compared to inorganic soils exist in Normal Kolkata Deposit at various depths. In this paper an attempt has been made to investigate the primary as well as secondary consolidation behavior of organic clay by conducting one-dimensional incremental loading tests. Cubical un-disturbed block samples of 300 mm size were collected from Jadavpur, Kolkata and Howrah maidan with in situ water content ranging from 60 to 90 % and organic content (OC) up to 28 %. Test results indicate that the rate and magnitude of settlements increase with the increase in OC. The compression index, Cc, was found to be in the range of 0.62–0.65 for Jadavpur soil and 0.85–0.91 for Howrah soil with pre-consolidation pressures of 95–103 and 110–120 kPa respectively. The observed values of Cα/Cc are 0.038 and 0.051 for Jadavpur and Howrah organic soils respectively. Long duration consolidation tests which were conducted to investigate the effect of increase in loading duration on consolidation parameters revealed no significant change in the behavior. As a whole, the consolidation behavior of Jadavpur soil (OC <15 %) was found closely related to that of soft soils at lower end and for Howrah soil (OC 25–28 %) the same behavior was noticed at higher end.
ABSTRACT: Organic soils which are more compressible than mineral soils exist in Kolkata region at... more ABSTRACT: Organic soils which are more compressible than mineral soils exist in Kolkata region at various depths with varying percentage of organic contents. Disturbed samples were collected from Howrah maidan and Jadavpur in Kolkata. These soils have in-situ water contents 65 – 90 % and organic content up to 30 %. An attempt has been made to investigate effect of strain rate on consolidation behavior of organic soil by conducting constant rate of strain (CRS) tests at strain rates 0.01, 0.04, 0.10 and 1.0 %/minute along with conventional IL tests for comparison. The results indicate that higher strain rate yield higher effective stress and also generate higher pore water pressure. Further, it is observed that CRS and IL test results may yield comparable results if the strain rates are selected judiciously depending on the type of soil. Increase in organic content suggests selection of slower strain rates to obtain comparable results with IL test. The study also revealed that under a given effective stress, coefficient of consolidation, cv, as well as vertical permeability, kv, increase with the increase in strain rate.
Abstract Organic soils which pose significant problems to
design engineers with its poor compress... more Abstract Organic soils which pose significant problems to
design engineers with its poor compressibility associated
with significantly different properties compared to inorganic
soils exist in Normal Kolkata Deposit at various depths. In
this paper an attempt has been made to investigate the primary
as well as secondary consolidation behavior of organic
clay by conducting one-dimensional incremental loading
tests. Cubical un-disturbed block samples of 300 mm size
were collected from Jadavpur, Kolkata and Howrah maidan
with in situ water content ranging from 60 to 90 % and
organic content (OC) up to 28 %. Test results indicate that
the rate and magnitude of settlements increase with the
increase in OC. The compression index, Cc, was found to be
in the range of 0.62–0.65 for Jadavpur soil and 0.85–0.91 for
Howrah soil with pre-consolidation pressures of 95–103 and
110–120 kPa respectively. The observed values of Ca/Cc are
0.038 and 0.051 for Jadavpur and Howrah organic soils
respectively. Long duration consolidation tests which were
conducted to investigate the effect of increase in loading
duration on consolidation parameters revealed no significant
change in the behavior. As a whole, the consolidation
behavior of Jadavpur soil (OC\15 %) was found closely
related to that of soft soils at lower end and for Howrah soil
(OC 25–28 %) the same behavior was noticed at higher end
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Papers by Bhimavarapu Reddy
design engineers with its poor compressibility associated
with significantly different properties compared to inorganic
soils exist in Normal Kolkata Deposit at various depths. In
this paper an attempt has been made to investigate the primary
as well as secondary consolidation behavior of organic
clay by conducting one-dimensional incremental loading
tests. Cubical un-disturbed block samples of 300 mm size
were collected from Jadavpur, Kolkata and Howrah maidan
with in situ water content ranging from 60 to 90 % and
organic content (OC) up to 28 %. Test results indicate that
the rate and magnitude of settlements increase with the
increase in OC. The compression index, Cc, was found to be
in the range of 0.62–0.65 for Jadavpur soil and 0.85–0.91 for
Howrah soil with pre-consolidation pressures of 95–103 and
110–120 kPa respectively. The observed values of Ca/Cc are
0.038 and 0.051 for Jadavpur and Howrah organic soils
respectively. Long duration consolidation tests which were
conducted to investigate the effect of increase in loading
duration on consolidation parameters revealed no significant
change in the behavior. As a whole, the consolidation
behavior of Jadavpur soil (OC\15 %) was found closely
related to that of soft soils at lower end and for Howrah soil
(OC 25–28 %) the same behavior was noticed at higher end
design engineers with its poor compressibility associated
with significantly different properties compared to inorganic
soils exist in Normal Kolkata Deposit at various depths. In
this paper an attempt has been made to investigate the primary
as well as secondary consolidation behavior of organic
clay by conducting one-dimensional incremental loading
tests. Cubical un-disturbed block samples of 300 mm size
were collected from Jadavpur, Kolkata and Howrah maidan
with in situ water content ranging from 60 to 90 % and
organic content (OC) up to 28 %. Test results indicate that
the rate and magnitude of settlements increase with the
increase in OC. The compression index, Cc, was found to be
in the range of 0.62–0.65 for Jadavpur soil and 0.85–0.91 for
Howrah soil with pre-consolidation pressures of 95–103 and
110–120 kPa respectively. The observed values of Ca/Cc are
0.038 and 0.051 for Jadavpur and Howrah organic soils
respectively. Long duration consolidation tests which were
conducted to investigate the effect of increase in loading
duration on consolidation parameters revealed no significant
change in the behavior. As a whole, the consolidation
behavior of Jadavpur soil (OC\15 %) was found closely
related to that of soft soils at lower end and for Howrah soil
(OC 25–28 %) the same behavior was noticed at higher end