Abstract
A simple and inexpensive method is adopted to measure the gate roadway deformation with advancing longwall coal face in Ikeshima Collieries of Matsushima Coal Mining Co., Ltd.Vertical closure of the gate roadway is much greater than sides closure. It is characterized that vertical closure reaches a certain value at about 100m distance behind longwall face.The effects of strata and mining conditions on the gate roadway deformation are studied by laboratory tests and elastic numerical analysis. It is shown that the deeper the depth of coal seam is and the weaker the strength of the floor rock is, the greater the gate roadway deformation becomes.It is difficult to get an empirical equation to preestimate the gate roadway deformation by statistical treatment of measuring data because of a shortage of the precise data. It becomes clear, however, that relating the results of elastic numerical analysis presented by Everling to measuring data makes it possible to preestimate the gate roadway deformation with a considerable accuracy.
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