Effect of sample size on consolidation of a fissured clay

1988 ◽  
Vol 25 (1) ◽  
pp. 76-84 ◽  
Author(s):  
Vinod K. Garga
Keyword(s):  
Experimental Investigation ◽  
Size Effect ◽  
Sample Size ◽  
Coefficient Of Consolidation ◽  
Different Depths ◽  
In Situ Permeability ◽  
London Clay ◽  
Constant Head ◽  
Oedometer Tests

This paper describes an experimental investigation on the effect of sample size on consolidation characteristics of fissured London Clay. Pore pressure dissipation tests on 38, 100, and 300 mm diameter samples were undertaken in the laboratory. Constant-head in situ permeability tests were conducted in four boreholes at different depths in the clay. Conventional oedometer tests on 76 mm diameter samples recovered from the same depths at which in situ permeability tests were carried out were also undertaken. The results show that both the coefficient of compressibility mv and the coefficient of consolidation determined in the laboratory are not significantly affected by sample size. It is concluded that estimate of in situ coefficient of consolidation can best be made from mv determined in the laboratory, and from in situ permeability measurements. Key words: consolidation, compressibility, fissured clay, permeability, size effect, testing.

In situ estimation of the coefficient of consolidation in clays

1990 ◽  
Vol 27 (1) ◽  
pp. 58-67 ◽  
Author(s):  
Mohammed G. Kabir ◽  
Alan J. Lutenegger
Keyword(s):  
Key Words ◽  
Pore Pressure ◽  
Reference Values ◽  
Time Factors ◽  
In Situ Tests ◽  
Coefficient Of Consolidation ◽  
Oedometer Test ◽  
Undisturbed Samples ◽  
Oedometer Tests

An investigation was conducted to demonstrate the applicability of cylindrical piezocone and flat piezoblade tests for providing reliable estimates of the coefficient of consolidation in clays. Coefficients of consolidation were calculated from piezocone dissipation tests for different degrees of consolidation using theoretical time factors to provide a comparison with laboratory oedometer tests. Three techniques were developed to calculate the coefficient of consolidation from piezoblade dissipation tests. Results from in situ pore pressure dissipation tests were compared with laboratory oedometer tests performed on undisturbed samples oriented in both the vertical and horizontal directions, to provide reference values of cv and ch. The results of investigations conducted at several clay sites are presented. Key words: in situ tests, piezocone, piezoblade, coefficient of consolidation, oedometer test, clays.

Constant Head in Situ Permeability Tests in Clay Strata

Géotechnique ◽  
1968 ◽  
Vol 18 (2) ◽  
pp. 172-194 ◽  
Author(s):  
W. B. Wilkinson
Keyword(s):  
In Situ Permeability ◽  
Constant Head

An Extension to the Theory of the Constant Head in Situ Permeability Test

Géotechnique ◽  
1970 ◽  
Vol 20 (2) ◽  
pp. 193-197 ◽  
Author(s):  
R. E. Gibson
Keyword(s):  
Permeability Test ◽  
In Situ Permeability ◽  
Constant Head

Interpretation of constant head in situ permeability tests in soil zones of finite extent

Géotechnique ◽  
1996 ◽  
Vol 46 (1) ◽  
pp. 133-143 ◽  
Author(s):  
E. N. Bromhead
Keyword(s):  
In Situ Permeability ◽  
Constant Head ◽  
Finite Extent

scholarly journals Evaluation of the Organic Soil Compressibility from In-Situ and Laboratory Tests for Road Application

2021 ◽  
Vol 16 (2) ◽  
pp. 110-126
Author(s):  
Iwona Chmielewska
Keyword(s):  
Organic Soil ◽  
Soil Improvement ◽  
Optimal Range ◽  
In Situ Tests ◽  
Constrained Modulus ◽  
North Eastern ◽  
Different Depths ◽  
Soil Compressibility ◽  
Oedometer Tests

Organic soil is characterised by high compressibility and should be improved so that it can be used for construction. The use of every method of soil improvement requires knowledge of the compressibility parameters. One of these parameters is the constrained modulus. The constrained modulus can be determined using laboratory or in-situ tests. In this study, the constrained modulus of organic soil was determined using oedometer and piezocone tests (CPTU). The author analysed subsoil under an approximately 250 m section of a designed road in north-eastern Poland. The constrained modulus of organic soil sampled from four different depths was determined in oedometer tests. Piezocone tests were conducted at 18 points located every 15 m along the length of the section concerned. To determine the constrained modulus based on the cone resistance from CPTU tests, the knowledge of the α and αM coefficients is needed. For the tested soil, the optimal range of the α coefficient from 0.4 to 0.7 was determined. The αM coefficient ranged from 0.4 to 0.8. The value of the constrained modulus of organic soil obtained from the oedometer tests, depending on the effective stress, ranged from approximately 100 kPa to 400 kPa. The constrained modulus of the tested soil decreased with depth, which both research methods proved.

Experimental investigation on splitting failure of high sidewall cavern under three-dimensional high in-situ stress

2021 ◽  
Vol 108 ◽  
pp. 103725
Author(s):  
Qiangyong Zhang ◽  
Fan Li ◽  
Kang Duan ◽  
Guangyuan Yu ◽  
Lei Cheng ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Three Dimensional ◽  
In Situ Stress ◽  
High In Situ Stress ◽  
Splitting Failure

Experimental study on rock mechanical behavior retaining the in situ geological conditions at different depths

2021 ◽  
Vol 138 ◽  
pp. 104548
Author(s):  
Heping Xie ◽  
Cong Li ◽  
Zhiqiang He ◽  
Cunbao Li ◽  
Yiqiang Lu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Mechanical Behavior ◽  
Geological Conditions ◽  
Different Depths ◽  
Rock Mechanical Behavior

scholarly journals Patch shape and size effect on performance of in-situ scarf patch repair in aircraft panel

2020 ◽  
Vol 1004 ◽  
pp. 012002
Author(s):  
Kishan Dwivedi ◽  
Himanshu Pathak
Keyword(s):  
Size Effect ◽  
Patch Repair ◽  
Patch Shape ◽  
Shape And Size

An in situ TEM study of the size effect on the thermally induced martensitic transformation in nanoscale NiTi shape memory alloy

2014 ◽  
Vol 588 ◽  
pp. 337-342 ◽  
Author(s):  
H.X. Li ◽  
S.C. Mao ◽  
K.T. Zang ◽  
Y. Liu ◽  
Z.X. Guo ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Size Effect ◽  
Shape Memory ◽  
Niti Shape Memory Alloy ◽  
In Situ Tem ◽  
Thermally Induced
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