高位巨厚岩浆岩断裂失稳机理研究

济宁二号井煤层埋藏较深,煤层上方赋存有巨厚无层理的岩浆岩,其失稳运移对安全生产具有潜在威胁。文章以相似模拟实验为手段研究了深部煤层开采过程中高位赋存的岩浆岩的运移机理,得出岩浆岩初次破断为固支梁的下位拉断非全厚破断,且破断后立即失稳;周期破断为全厚回转拉破断,破断后岩浆岩岩块铰结成"梁",不易失稳。

Collapse rupture mechanism of extra heavy magmatic rock

According to the geologic records of 2# mine in Jining, we conclude that imbedding depth of coal seam is deep, and extra heavy magmata rock without beddings and fractures existed in main roof,its displacement rules and instability have potential threat to the security production. So the similar simulation method is used in research on the instability mechanism and displacement rules of overlying magmata strata at the process of deep coal seam exploitation. The results showed that the magmata strata failure was characterized by their periodic configuration. And the first of that is not the whole rock mass failure but the bottom of strata snapped, then be of instability. The model of magmata rock failure showed rotation and periodic configuration with seam exploitation. When the block of magmata rock failure articulated to be "beam", it is difficult to be unstable failure.