Masters Theses

Keywords and Phrases

Concrete; Damage; Dynamic; Impact; Mine seal; Projectile

Abstract

"The current lack of projectile damage criteria for mine seals is assessed to determine if criteria should be developed. Impact experiments were performed on a full-scale 50 psi mine seal to determine failure modes, dynamic stress state, and assess risk to existing operational mine seals. Test projectiles were selected from common underground coal mine items propelled by means of a black powder projectile generator. Projectile velocities attained in testing ranged from approximately 100 to 650 ft/s (30 to 200 m/s). Dynamic strain was measured on the non-impact face to derive the state of stress and estimate failure criteria. Penetration models were used to estimate depth of penetration and compared to empirical data. Finite element analysis impact simulation was compared with empirical data and a critical impact velocity for rigid body projectiles of 20 to 30 lb (9 to 14 kg) was estimated to be in the range of 550 to 600 ft/s (168 to 183 m/s). Damage to the mine seal was observed and compared with numerical simulation to assess the need for defined projectile damage criteria to mine seals"--Abstract, page iii.

Advisor(s)

Perry, Kyle A.

Committee Member(s)

Lusk, Braden
Johnson, Catherine E.

Department(s)

Mining Engineering

Degree Name

M.S. in Explosives Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2019

Pagination

xii, 336 pages

Note about bibliography

Includes bibliographical references (pages 333-335).

Rights

© 2019 Bruce Albert von Nieder{tilde}husern, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 11653

Electronic OCLC #

1139525662

Download

Share

 
COinS