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Rock mechanics investigations of structural stability in the Bulli seam at West Cliff Colliery

Technical Report:

Abstract

Rock mechanics investigations were conducted at West Cliff colliery to obtain rock properties and stress measurements and study the stability of mining structures. The roof and floor were drilled in order to obtain core for rock testing and lump samples of coal were collected in order to measure the coal properties. Absolute stress measurements were obtained using CSIR cells. The strata were sufficiently uniform and competent to overcore the emplaced cells. Testing revealed that the rocks were better than average for coal measure sedimentary strata and the stresses indicated the existence of a moderately high horizontal stress field. The coal is of average strength only with some marked variation relating to the very banded nature of the seam. Finite element analyses showed that the rectangular roadways driven using roof bolts and timber supports were stable and adequately stable by an indicative factor of safety of about l.5.
Authors:
Publication Date:
Mar 01, 1978
Product Type:
Technical Report
Report Number:
ACIRL-PR-78-4
Reference Number:
EDB-80-093562
Subject:
01 COAL, LIGNITE, AND PEAT; MINE ROADWAYS; STABILITY; UNDERGROUND MINING; STRESS ANALYSIS; AUSTRALIA; COAL; COAL MINES; DRILL CORES; FINITE ELEMENT METHOD; MECHANICAL PROPERTIES; ROCK MECHANICS; ROCKS; ROOF BOLTS; SAFETY; SAMPLING; SUPPORTS; AUSTRALASIA; CARBONACEOUS MATERIALS; ENERGY SOURCES; EQUIPMENT; FOSSIL FUELS; FUELS; MECHANICAL STRUCTURES; MINES; MINING; MINING EQUIPMENT; NUMERICAL SOLUTION; TUNNELS; 012000* - Coal, Lignite, & Peat- Mining
OSTI ID:
5269722
Research Organizations:
Australian Coal Industry Research Labs. Ltd., Sydney
Country of Origin:
Australia
Language:
English
Availability:
Australian Coal Industry Research Labs. Ltd., Sydney.
Submitting Site:
CLA
Size:
Pages: 50
Announcement Date:

Technical Report:

Citation Formats

Jaggar, F. Rock mechanics investigations of structural stability in the Bulli seam at West Cliff Colliery. Australia: N. p., 1978. Web.
Jaggar, F. Rock mechanics investigations of structural stability in the Bulli seam at West Cliff Colliery. Australia.
Jaggar, F. 1978. "Rock mechanics investigations of structural stability in the Bulli seam at West Cliff Colliery." Australia.
@misc{etde_5269722,
title = {Rock mechanics investigations of structural stability in the Bulli seam at West Cliff Colliery}
author = {Jaggar, F}
abstractNote = {Rock mechanics investigations were conducted at West Cliff colliery to obtain rock properties and stress measurements and study the stability of mining structures. The roof and floor were drilled in order to obtain core for rock testing and lump samples of coal were collected in order to measure the coal properties. Absolute stress measurements were obtained using CSIR cells. The strata were sufficiently uniform and competent to overcore the emplaced cells. Testing revealed that the rocks were better than average for coal measure sedimentary strata and the stresses indicated the existence of a moderately high horizontal stress field. The coal is of average strength only with some marked variation relating to the very banded nature of the seam. Finite element analyses showed that the rectangular roadways driven using roof bolts and timber supports were stable and adequately stable by an indicative factor of safety of about l.5.}
place = {Australia}
year = {1978}
month = {Mar}
}