Abstract
Japanese Coal Mines are suffering from the severe floor lift of roadway and many attempts have done to find the suitable and effective controlling method of floor lift. But until now decisively effective method is not yet established.The model experiments, using equivalent materials, of the floor lift occurring when the coal face passed over the roadway driven in the weak rock were carried out. The authors investigated the following items and reported some results.(1) The behavior of the weak rock around the roadway.(2) The relations between the intensity of the floor lift and the depth of roadway up to 1000m.(3) The effectiveness to control the floor lift by floor bolting. The relations between length of bolt and the intensity of the floor lift.
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