地下採掘によるかんがい池の被害

抄録

There seems to be very few quantitative informations about mining damages to the structures on the surface. The ponds which exist in the Kyushu coal fields and have been damaged due to mining subsidence were investigated concerning with the time, the point and magnitude of damage, the length of dam, the geological conditions and the mining map and were compared with the results of the theoretical calculation of the surface strains. The followings became clear after the comparison.
1) The position of dam within tension zones in both the directions of dam axis and flow axis affects the amount of mining damage to the pond.
2) Increasing the magnitude of tensile strain on the dam by more than 2mm/m a year causes leakage or exhaustion of pond water.
3) The effect of local geology on mining damage is of importance.