層採掘における採炭坑道の変形挙動とその予測

採炭坑道の維持に関する研究 (第1報)

抄録

Deformations of gate roadways located under previous workings are measured and compared to the theoretical values obtained by quasi-three dimensionalstress analysis.
The results of measurement show that roadways deform less and supports keep more stable under the goaf of old workings than under pillar or rib, where roadways deteriorate significantly requring constant repair. The advance of current longwall faces also promotes roadway deformation.
The stress analysis shows that the amount and the trend of redistributed stresses along gate roadway are major contributory factors to deformation of gate roadways. Moreover, it is shown that using the stress increases derived from stress analysis and closure factors, the vertical closure of gate roadways caused by longwall mining can be predicted well. This means that the analysis can be used as an aid to rational planning of mining layouts and roadway maintenance under more complicated conditions.