Doctoral Dissertations

Duk-Won Park

Abstract

"A laser holographic interferometric technique has been recently developed and applied to research in several engineering fields. The technique has many possible applications in earth science and engineering. In this study it was shown that laser holographic ii interferometry can be used to study surface ground movements resulting from subsurface cavity collapse.

One of the most important advantages of the holographic interferometric technique is a rapid three-dimensional displacement measurement of a surface without contact or emplacement of instruments. The surface does not have to be flat or smooth allowing deflection contours to be generated on a granular surface. applied in a study of model subsidence. These advantages were applied in a study of model subsidence.

Subsidence is a serious environmental problem, and an important factor in designing underground coal mines. This is especially true as the mining method is changed from room and pillar mining to longwall mining as is currently occurring in the U.S.A.

Subsidence models were made to simulate ground movement due to mining operations. The models were monitored using holographic interferometry to record subsidence under a variety of conditions. Room and pillar mine models using water pressure simulation successfully simulated roof movement using both double exposure and real time holographic methods. Simple cavity models provided sufficient quantitative data to analyze the effects of cavity size, depth of the cavity, cavity orientation, surface structure and some geologic factors. Gelatin and sand were used as the model materials.

Sequential cavity development models were developed which provided consistent results of continuous subsidence development.

The investigation proved subsidence modelling techniques using laser holographic interferometry are practical. This method can be used for more complex subsidence studies to evaluate the influence of geometry, materials and time"-- Abstract, pp. ii-iii

Advisor(s)

Summers, David J.

Committee Member(s)

Aughenbaugh, N. B.
Warner, Donald L.
Reisbig, R. L.
Barr, David J.
Hansen, Peter G., 1927-2010

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Geological Engineering

Publisher

University of Missouri--Rolla

Publication Date

1975

Pagination

xiii, 150 pages

Note about bibliography

Includes bibliographical references (pages 140-149)

Rights

© 1975 Duk-Won Park, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 3054

Print OCLC #

6013460

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