Masters Theses

Choon K. Quan

Abstract

"Blasting effects depend largely on peak radial strains propagated in rock media by explosive impact. To improve blasting design and control of secondary effects (e.g., structural fatigue), an equation for peak radial strain propagation induced by explosions was developed as follows: Emax = K e-αr /r

An instrumental technique was designed to test the validity of the equation in the Jefferson City dolomite. Results showed ii that for 1-lb charges of 60% ammonia-gelatin explosive, peak strains, at any distance r, were reduced in amplitude in accordance with an exponential decay function of the type Emax = 281 e-0.026r / r The equation compared favorably with results from other investigations in a similar medium.

The study described herein was based on the assumption that the value of the K constant in the propagation equation was a function of the explosive quantity and type. On the other hand, the decay constant, α , appeared to be a function of the rock medium. The velocity of propagation of the strain waves was found to be reasonably constant at an approximate rate of 17,300 ft. per sec. Other important characteristics of the waves that were studied included rise times, fall times, and pulse widths. These were found to vary with distance"-- Abstract, p. ii

Advisor(s)

Ash, Richard L.

Committee Member(s)

Hansen, Peter G., 1927-2010
Scott, James J.
Nelson, John August

Department(s)

Mining Engineering

Degree Name

M.S. in Mining Engineering

Publisher

University of Missouri at Rolla

Publication Date

1964

Pagination

viii, 83 pages

Note about bibliography

Includes bibliographical references (pages 67-69)

Rights

© 1964 Choon K. Quan, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 1609

Print OCLC #

5959220

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