Effects of frost on the mechanical behaviour of Champlain Sea clays

1991 ◽  
Vol 28 (5) ◽  
pp. 690-697 ◽  
Author(s):  
S. Leroueil ◽  
J. Tardif ◽  
M. Roy ◽  
P. La Rochelle ◽  
J.-M. Konrad
Keyword(s):  
Shear Strength ◽  
Key Words ◽  
Granular Materials ◽  
Volume Change ◽  
Mechanical Behaviour ◽  
Undrained Shear Strength ◽  
Freeze Thaw ◽  
Liquidity Index ◽  
Thaw Consolidation ◽  
Undrained Shear

This paper presents the mechanical behaviour of Champlain Sea clays when subjected to one cycle of freeze-thaw. It appears that most of the characteristics, namely, the undrained shear strength, the thaw consolidation volume change, and the strength after consolidation, are related to the initial liquidity index and can thus be easily predicted. Results also show that frozen–thawed Champlain Sea clays present a dilatant behaviour very similar to that of granular materials. Key words: sensitive clays, frost, laboratory, strength, compressibility.

Determination of the consistency limits of soils by the fall cone test

1986 ◽  
Vol 23 (2) ◽  
pp. 241-246 ◽  
Author(s):  
Y. Wasti ◽  
M. H. Bezirci
Keyword(s):  
Shear Strength ◽  
Key Words ◽  
Water Content ◽  
Strength Criterion ◽  
Undrained Shear Strength ◽  
Wide Range ◽  
Undrained Strength ◽  
Content Range ◽  
Undrained Shear

The liquid and plastic limits for a variety of natural and artificial soils covering a wide range of plasticity, as determined by the Casagrande method and the fall cone test and based on a strength criterion, were compared. To check the validity of the strength criterion, the undrained shear strength of these soils has been determined with a laboratory vane over the water content range between these limits. A limited comparison of the undrained strength values obtained from the vane test and fall cone test is also given. Key words: Atterberg limits, consistency, fall cone, laboratory vane, shear strength.

Effets du gel sur les infrastructures routières argileuses au Québec

1992 ◽  
Vol 29 (1) ◽  
pp. 131-142 ◽  
Author(s):  
Marius Roy ◽  
Jean Tardif ◽  
Serge Leroueil ◽  
Gaston Larose ◽  
Pierre La Rochelle
Keyword(s):  
Field Study ◽  
Key Words ◽  
Mechanical Behaviour ◽  
Clayey Soils ◽  
Freeze Thaw ◽  
Freeze And Thaw ◽  
Liquidity Index ◽  
Thaw Cycle ◽  
Laboratory Results ◽  
Freeze Thaw Cycle

This study deals with the freeze and thaw effects on the mechanical behaviour of the clayey subgrades exposed by cuts for the placement of road foundations. Twelve cut sites have been analysed in cooperation with the ministère des Transports du Québec. As damages were observed after the first winter on some of the sites, whereas none were apparent on other sites, it was possible to define the factors that may lead to such damages. In particular, the field study confirms the laboratory results showing that criteria based on liquidity index are sufficient to characterize the change of mechanical behaviour of the clayey soils subjected to one freeze–thaw cycle. Key words : clay, liquidity index, freeze-thaw, bearing capacity of roads, heaving, cut. [Translated by the Journal]

Relationship between measured plastic limit and plastic limit estimated from undrained shear strength, water content ratio and liquidity index

Clay Minerals ◽  
2017 ◽  
Vol 52 (4) ◽  
pp. 509-519 ◽  
Author(s):  
Giovanni Spagnoli ◽  
Martin Feinendegen
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Human Error ◽  
Undrained Shear Strength ◽  
Plastic Limit ◽  
Limit Values ◽  
Liquidity Index ◽  
Content Ratio ◽  
Exponential Trend ◽  
Undrained Shear

AbstractThe detection of the plastic limit of clays is subject to human error. Several attempts have been made to correlate across studies the geotechnical properties of fine-grained soils (water content, liquidity index, shear strength, etc.). Based on the premise that the liquidity index and water content ratio can be correlated directly, an alternative method to obtain indirectly the plastic limit is suggested here. The present study investigated 40 natural clayey samples of various mineralogies and origins and other publicly available data, where Atterberg limits and undrained shear strength values obtained with the vane shear tests were given. The liquidity index and water-content ratio correlate very well for defined undrained shear strength values of the clays. Solving the liquidity index equation for the plastic limit, estimated plastic limit values obtained by the liquidity index/water-content ratio relationship were compared with laboratory plastic-limit values. Preliminary results based on 62 values show an exponential trend with a multiple regression coefficient of 0.79. The data need to be confirmed on a larger database, however.

A statistical evaluation of some engineering properties of eastern Canadian clays

1990 ◽  
Vol 27 (3) ◽  
pp. 373-386 ◽  
Author(s):  
Étienne J. Windisch ◽  
Raymond N. Yong
Keyword(s):  
Shear Strength ◽  
Statistical Evaluation ◽  
Undrained Shear Strength ◽  
Plasticity Index ◽  
Engineering Properties ◽  
Plastic Limit ◽  
Liquidity Index ◽  
Marine Clays ◽  
Undrained Shear

Statistics for data collected on eastern Canadian clays (Champlain, Goldthwait, Tyrrell, and Laflamme marine clays and Barlow–Ojibway lacustrine clays) are computed and analyzed. These clays are divided into three groups: eastern Canadian marine clays, Champlain clays (as an important part of the first group), and Barlow–Ojibway lacustrine clays. The analysis reveals significant differences between eastern Canadian clays and Scandinavian clays. Some relationships proposed in the literature and based on plasticity index, liquidity index, and plastic limit are found to be inapplicable to eastern Canadian clays. On the basis of a proposed method for estimating the undrained shear strength of normally consolidated eastern Canadian marine clays, the overconsolidation ratio is found to be equal to the ratio of the in situ undrained shear strength to the estimated normally consolidated undrained shear strength. Key words: undrained shear strength, plasticity index, liquidity index, plastic limit, statistical evaluation, over-consolidation ratio, lacustrian clays.

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