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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 ro...