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Rock burst prevention at steep seam mining

Journal Article:

Abstract

At steep shield longwalls one method of preventing rock bursts is to avoid sharp angles during working. Stress in coal and rock body that appears when steep seams are worked where rock bursts occur at corners of set-up entries is discussed. The dynamic interaction between gas and rock pressure is assessed. Maintains that in order to avoid rock bursts at these places it is necessary to turn the protruding coal wall by 20-30 degrees towards the coal body to divert the action of shift forces. At the same time the face should also be inclined (by 10-15 degrees) to move the zones of increased stress away from the corner into the coal and rock body. Stress at workings with round cross-sections is 3-4 times lower than at square cross-sections. Recommendations are given that concern shearer loader operation (semi-spherical shape of the face), borehole drilling and water injection. Initial distance of 10-15 m between boreholes is suggested. 3 refs.
Authors:
Publication Date:
Sep 01, 1988
Product Type:
Journal Article
Reference Number:
CLA-89-061010; EDB-89-068224
Resource Relation:
Journal Name: Ugol' Ukr.; (Ukrainian SSR); Journal Volume: 9
Subject:
01 COAL, LIGNITE, AND PEAT; INCLINED STRATA; ROCK MECHANICS; STRATA CONTROL; ROCK BURSTS; INHIBITION; BOREHOLES; COAL MINES; CONFIGURATION; DIMENSIONS; DRILLING; FLUID INJECTION; LONGWALL MINING; SHAPE; SPATIAL DISTRIBUTION; STATIC LOADS; STRESS ANALYSIS; STRESS RELAXATION; STRESSES; UNDERGROUND MINING; USSR; WORKING FACES; ASIA; CAVITIES; DISTRIBUTION; EASTERN EUROPE; EUROPE; GEOLOGIC STRATA; GEOLOGIC STRUCTURES; MECHANICS; MINES; MINING; RELAXATION; UNDERGROUND FACILITIES; 012031* - Coal, Lignite, & Peat- Underground Mining- Strata Mechanics & Control- (1987-)
OSTI ID:
6309329
Research Organizations:
KPI (USSR)
Country of Origin:
Ukraine
Language:
Russian
Other Identifying Numbers:
Journal ID: CODEN: UGOUA
Submitting Site:
CLA
Size:
Pages: 35-36
Announcement Date:

Journal Article:

Citation Formats

Efremov, G D. Rock burst prevention at steep seam mining. Ukraine: N. p., 1988. Web.
Efremov, G D. Rock burst prevention at steep seam mining. Ukraine.
Efremov, G D. 1988. "Rock burst prevention at steep seam mining." Ukraine.
@misc{etde_6309329,
title = {Rock burst prevention at steep seam mining}
author = {Efremov, G D}
abstractNote = {At steep shield longwalls one method of preventing rock bursts is to avoid sharp angles during working. Stress in coal and rock body that appears when steep seams are worked where rock bursts occur at corners of set-up entries is discussed. The dynamic interaction between gas and rock pressure is assessed. Maintains that in order to avoid rock bursts at these places it is necessary to turn the protruding coal wall by 20-30 degrees towards the coal body to divert the action of shift forces. At the same time the face should also be inclined (by 10-15 degrees) to move the zones of increased stress away from the corner into the coal and rock body. Stress at workings with round cross-sections is 3-4 times lower than at square cross-sections. Recommendations are given that concern shearer loader operation (semi-spherical shape of the face), borehole drilling and water injection. Initial distance of 10-15 m between boreholes is suggested. 3 refs.}
journal = {Ugol' Ukr.; (Ukrainian SSR)}
volume = {9}
journal type = {AC}
place = {Ukraine}
year = {1988}
month = {Sep}
}