Scholarly record
ASSESSMENT OF MOISTURE EFFECT ON ROOF ROCK BEHAVIOUR IN EAST ALBORZ COAL MINES
Abstract
Roof falls continue to be one of the greatest hazards faced by underground coal miners. For preventing unpredictable hazards and losses due to roof falls, assessment of roof rock behaviour in coal mines plays an assential role in ground control issue. However, based on the intensive reserches in this area, various parameters influence the roof rock behaviour of the stratified rock mass. One of them, which is extremely important to coal mine ground control, is moisture sensitivity. Many coal seams have immediate roofs with moisture sensitivite and weak shale compositions. presence of moisture sensitivite mudrocks can cause ground control problems. They can severly damage the roof by reducing rock strength, and generating swelling pressures. Therfore, in roof rock assessment, moisture sensitivity is the factor, which must be assessed carfully and with high accuracy. Although slake durability test (SDT) has been widely used to evaluate moisture sensitivity of mudrocks, this method is a labratory test and is a time consuming method. Furthermore in this method, rock samples must be carefully wrapped to maintain in situ moisture content. Therfore, determination of an index that can easily measure this parameter in situ and with high accuracy has great importance. Immersion test is A simple method which can easily determine this index. In this research, to compare the slake durability and immersion test and establish the relationship between the two tests, rock samples were collected from various mines of East Alborz coalfield. These samples tested with two methods. According to these analyses, a high correlation was found between the two tests.
Publication details
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