Variability of overconsolidated soils from Poland in geotechnical practice

ce/papers ◽  
2018 ◽  
Vol 2 (2-3) ◽  
pp. 585-590 ◽  
Author(s):  
Witold BOGUSZ ◽  
Marcin WITOWSKI
Keyword(s):  
Overconsolidated Soils

Prediction of Foundation Deformations in Edmonton Using an In Situ Pressure Probe

1973 ◽  
Vol 10 (2) ◽  
pp. 193-210 ◽  
Author(s):  
Z. Eisenstein ◽  
N. A. Morrison
Keyword(s):  
Theory Of Elasticity ◽  
Pressure Probe ◽  
Substantial Part ◽  
Total Deformation ◽  
Element Analysis ◽  
Laboratory Test Results ◽  
Foundation Deformation ◽  
Sample Disturbance ◽  
Overconsolidated Soils

For overconsolidated soils and soft rocks the instantaneous component of foundation settlement or heave is a substantial part of the total deformation. Hence, for such cases large portions of the total deformation can be estimated using the theory of elasticity if representative moduli can be determined. However, deformation moduli, especially in overconsolidated soils, are susceptible to sample disturbance and this severely restricts the accuracy of predicting foundation deformation based on laboratory test results. In Edmonton, settlements of large buildings are overestimated 10–30 times if oedometer results are used. Therefore an in situ pressure probe technique has been used to measure moduli of instantaneous deformation in boreholes penetrating foundation strata near two multi-storey buildings in Edmonton — the C.N. and A.G.T. Towers. For these structures records of either settlements (C.N. Tower) or excavation heave (A.G.T. Tower) were available. The moduli obtained from in situ pressuremeter tests were used in the finite element analysis. The results agree remarkably well with field observations and demonstrate the applicability of this method in practice. The economics of the pressure probe investigation technique is competitive with existing methods.

Strain Energy and Behaviour of Overconsolidated Soils

1967 ◽  
Vol 4 (3) ◽  
pp. 326-333 ◽  
Author(s):  
Elmer W Brooker
Keyword(s):  
Mechanical Properties ◽  
Strain Energy ◽  
Large Scale ◽  
Chemical Properties ◽  
Earth Pressure ◽  
Quantitative Evidence ◽  
Physico Chemical ◽  
Overconsolidated Clays ◽  
Overconsolidated Soils

Bjerrum recently presented a strain energy hypothesis which explains qualitatively the behaviour of overconsolidated clays and the phenomena of long-term slope failures in these soils. Quantitative evidence, gathered from a series of large-scale consolidation tests, is presented here which supports the strain energy hypothesis. The coefficient of earth pressure at rest was found to be a function of strain energy at a given value of OCR. It is also shown that the degree of disintegration of overconsolidated soils during a slaking test is related to strain energy. It is inferred from the results that mineralogy and the capacity of a soil to adsorb strain energy are related. The evidence suggests that certain physico-chemical properties may be quantitatively related to mechanical properties through the concept of strain energy.

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