Abstract

In Missouri, the horizontal stresses (pressures) in the near surface rock are uncommonly high. While the vertical stresses in rock are simply a function of the weight of the overlying rock, near surface stresses can be many times higher. The near surface horizontal stresses can be in excess of 5 times greater than the vertical stresses. In this research, Flatjack method was used to measure horizontal stress in Red Granite Quarry in Missouri. The flat jack method is an approved method of measuring ground stresses. A saw cut is used to "relax" the stress in the ground by allowing the rock to deform inwards the cut. A hydraulic flat jack is used to inflate the slot; to push the rock back to its stressed position, as measured by a strain gauge on either side of the slot. The pressure in the jack, when the rock is exactly back to its original position, is equal to the ground stress before the saw cut was made. According to the results, present production direction for each pit is not good because the maximum stress direction is perpendicular with production direction. This case causes unintentional breakage results in the loss rock. The results show that production direction should be changed.

Meeting Name

World Multidisciplinary Earth Sciences Symposium (2016: Sep. 5-9, Prague, Czech Republic)

Department(s)

Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

Data Mining; Earth Sciences; Environmental Technology; Mineral Resources; Mining Engineering; Mining Laws And Regulations; Quarries; Remote Sensing; Sawing; Strain Gages; Dimension Stone; Granite Quarry; Ground Stress; Horizontal Stress; Maximum Stress; Near-Surface Stress; Vertical Stress; Breakage; Deformation Mechanism; Fracture Propagation; Pressure Effect; Quarry; Missouri; United States

International Standard Serial Number (ISSN)

17551307

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2016 Institute of Physics Publishing, All rights reserved.

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Article Location

 
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