Field observations of soft clay consolidation in the Fraser Lowland

Keyword(s):  
1994 ◽  
Vol 31 (5) ◽  
pp. 773-778 ◽  
Author(s):  
Jianhua Yin ◽  
James Graham ◽  
Jack I. Clark ◽  
Longjun Gao

Field observations in thin soft clay layers may show pore-water pressures that increase for some time after the loading is applied. Reasons for these observations are not well understood. The paper shows how an elastic viscoplastic constitutive model incorporated into the consolidation equation can predict these pore-water pressure increases in soils that exhibit significant creep behaviour (or secondary compression). The phenomenon has been related to relaxation in regions of the profile from which drainage has not yet begun. Key words : clay, consolidation, creep, secondary compression, viscous, relaxation, pore-water pressure, elastic–plastic.


1988 ◽  
Vol 25 (3) ◽  
pp. 632-632
Author(s):  
C. B. Crawford ◽  
L. J. deBoer
Keyword(s):  

1987 ◽  
Vol 24 (2) ◽  
pp. 308-317
Author(s):  
C. B. Crawford ◽  
L. J. DeBoer

This paper presents a 15-year record of consolidation settlements under an earth embankment where maximum settlements have exceeded 3 m since 1971. The rate of settlement was greatly accelerated by the use of sand drains under areas of maximum load. During construction, pore pressures in the subsoil were monitored and used to control the rate of loading, which had to be decreased to avoid failure. Settlements were underestimated and stability was overestimated on the basis of laboratory and field tests. Consolidation characteristics measured in the laboratory are compared with those calculated from field observations. Key words: settlements, consolidation, embankment, pore-water pressures, monitoring, in situ.


1974 ◽  
Vol 11 (2) ◽  
pp. 223-229 ◽  
Author(s):  
G. G. Meyerhof

The ultimate bearing capacity of footings resting on subsoils consisting of two layers has been investigated for the cases of dense sand on soft clay and loose sand on stiff clay. The analyses of different modes of soil failure are compared with the results of model tests on circular and strip footings and some field observations of foundation failures.


2020 ◽  
pp. 10-21 ◽  
Author(s):  
Vladimir V. Voronov ◽  
Nikolay I. Shchepetkov

The article describes content of original and relevant but virtually forgotten thesis of V.V. Voronov on lighting of production site interiors by means of overhead natural (using three types of skylights) and artificial illumination, in order to elaborate scientific methodology for architectural design of more qualitative luminous environment on the basis of comprehensive approach and enhanced criteria framework of its evaluation using light engineering parameters. The thesis is unique in terms of the scope and quality of field and laboratory observations which are reflected not only in the text but also in the graphical attachments, namely photos, figures, schemes, drawings, charts, nomograms, and diagrams accompanied by specific measured or calculated parameters. The first part of the thesis contains theoretical basics and results of field observations conducted by different methods. This second part is the exposition of chapter 3 of the V.V. Voronov’s candidate thesis (1985). It describes the methodology for and the results of the experiments by means of planar and volumetric light simulation using the architectural lighting simulating assembly (chamber) which were conducted in MARKHI in 1970–1985.


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