Session Start Date

6-1-1988

Abstract

The paper presents a case history of performance and analysis of results of vertical & horizontal resonance tests on a standard concrete block in a well, for in-situ determination of dynamic properties of soil required for design of a turbo-generator, under unusual conditions of high water table. Pumping from the two wells constructed for lowering the water level was not enough and pumping from within the main well had to be resorted to bring down the water level to a little below the top surface of the model block. As expected, amplitude versus frequency curves for vertical resonance test showed two resonant peaks instead of one, indicating occurrence of two modes of vibration. A method for estimating dynamic co-efficients of soil, through derived curves for ratio of natural frequencies in horizontal and vertical modes versus effective area of base, has been suggested. A repeat test under good conditions confirmed the adequacy of the method.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Second Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1988

Document Version

Final Version

Rights

© 1988 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

In-Situ Determination of Dynamic Properties of Soil for Foundation of a Turbo-Generator

The paper presents a case history of performance and analysis of results of vertical & horizontal resonance tests on a standard concrete block in a well, for in-situ determination of dynamic properties of soil required for design of a turbo-generator, under unusual conditions of high water table. Pumping from the two wells constructed for lowering the water level was not enough and pumping from within the main well had to be resorted to bring down the water level to a little below the top surface of the model block. As expected, amplitude versus frequency curves for vertical resonance test showed two resonant peaks instead of one, indicating occurrence of two modes of vibration. A method for estimating dynamic co-efficients of soil, through derived curves for ratio of natural frequencies in horizontal and vertical modes versus effective area of base, has been suggested. A repeat test under good conditions confirmed the adequacy of the method.