Alternative Title

Paper No. 9.01

Location

St. Louis, Missouri

Session Start Date

3-8-1998

Session End Date

3-15-1998

Abstract

The effects of anisotropy and sample disturbance on the consolidation parameters were investigated through laboratory testing, and the degree of sample disturbance on the consolidation parameters in the periphery of the drain is evaluated. A new method for settlement analysis, taking into consideration both sample disturbance and the retardation of the consolidation in the ground improved by vertical drain, is proposed. The effects of anisotropy and sample disturbance on the consolidation parameters in the ground improved by vertical drain are given as the function of the distance from the boundary of drain. In the undisturbed zone, the ratio of the coefficient of consolidation of the horizontal to the vertical is about 1.70, and in the completely remolded soil at the periphery of the drain, about 0.50. A new method for settlement analysis, taking into consolidation both anisotropy and disturbance in the ground improved by vertical drain, is proposed. For the marine and the continental day deposits in Japan, the accuracy of the prediction of the consolidation settlement by the proposed method under the degree of consolidation U=80% are (7~20)% for the marine clay deposits and (3~20)% for the continental clay deposits.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-8-1998

Document Version

Final Version

Rights

© 1998 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Case Histories for Settlement Analysis in Ground Improved by Vertical Drain

St. Louis, Missouri

The effects of anisotropy and sample disturbance on the consolidation parameters were investigated through laboratory testing, and the degree of sample disturbance on the consolidation parameters in the periphery of the drain is evaluated. A new method for settlement analysis, taking into consideration both sample disturbance and the retardation of the consolidation in the ground improved by vertical drain, is proposed. The effects of anisotropy and sample disturbance on the consolidation parameters in the ground improved by vertical drain are given as the function of the distance from the boundary of drain. In the undisturbed zone, the ratio of the coefficient of consolidation of the horizontal to the vertical is about 1.70, and in the completely remolded soil at the periphery of the drain, about 0.50. A new method for settlement analysis, taking into consolidation both anisotropy and disturbance in the ground improved by vertical drain, is proposed. For the marine and the continental day deposits in Japan, the accuracy of the prediction of the consolidation settlement by the proposed method under the degree of consolidation U=80% are (7~20)% for the marine clay deposits and (3~20)% for the continental clay deposits.