Based on this case, through filling the gob area by means of chamber blasting, the requirement of protective top - layer for slicingandcaving can be achieved.
针对这一情况，从药室爆破放顶充填采空区，从而达到分层崩落法采矿的护顶层要求。
2
A coal mining method with a combination of a slicingandcaving, a double benefit in control of water conducted crack zone development and in reduction of coal production cost can be obtained.
对厚煤层采用分层与放顶煤相结合的采煤方法，既可控制导水裂缝带的发育高度，又可降低生产成本。
3
The rock movement between the horizontal section of the top coal cavingand inclined slicing of the top coal caving was analyzed.