عنوان

Behaviour of clayey soils under slow repeated loading and laboratory estimation of K(0) for overconsolidated sands

Number

TLpq304184928

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Behaviour of clayey soils under slow repeated loading and laboratory estimation of K(0) for overconsolidated sands

General Material Designation

[Thesis]

First Statement of Responsibility

H. Abdi

Subsequent Statement of Responsibility

V. K. Garga

Name of Publisher, Distributor, etc.

University of Ottawa (Canada)

Date of Publication, Distribution, etc.

1994

Specific Material Designation and Extent of Item

161

Dissertation or thesis details and type of degree

M.A.Sc.

Body granting the degree

University of Ottawa (Canada)

Text preceding or following the note

1994

Text of Note

Repeated undrained load tests were carried out under the application of cyclic deviator stresses at a frequency that varies from 0.0001 Hz up to 0.001 Hz. For a specific amplitude of applied stress, a critical level of repeated loading (CLRL) was evaluated for both kaolinite and crust clays. The strength of the soil is affected by the frequency, cyclic fluctuation of water table, and the amount of axial strain developed during cycling. The decrease in postcyclic strength is strain-dependent. It is further shown that cycling below the CLRL causes an increase in the overconsolidation of the clayey soils. The effect of cycling in behaviour of soils increases with increasing the OCR. This thesis also describes a method for the determination of in situ horizontal stresses of heavily overconsolidated sands using a stress-path triaxial apparatus. This method was proposed by Garga and Khan (1991) who applied it for overconsolidated clays. The proposed method is based on the concept that if the radial stress exceeds the in situ horizontal stress, while maintaining the axial stress constant and equal to the in situ vertical effective stress, only then will the sample experience significant axial strain. In this investigation, the above method is applied to the samples of known stress histories of overconsolidated sand. The effect of the complex stress history undergone by soils on the estimation of K0 by the proposed method is investigated in laboratory. It is found that the proposed method replicated the imposed "in situ" horizontal stress exactly. Also this method is capable of estimating usd\rm K\sb0usd of an overconsolidated soil irrespective of the previously imposed stress history. (Abstract shortened by UMI.)

Applied sciences

Civil engineering

H. Abdi

V. K. Garga

Electronic name

p

[Thesis]

276903

a

Y