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１ 放顶煤工作面采出率调查与测算自从放顶煤工作面在生产矿井投产以来，工作面单产得到了大幅度的提高，而对资源采出率的真实情况缺乏实际评价。大多数领导只是从放顶煤现象上认为工作面产量较高，工作面采出率肯定较高，个别人甚至认为矸石已经放出，采出率已超过１００％?
1 Caving Face Investigation and Calculation Since the caving face has been put into operation in the production of mines, face production has been greatly improved, and the lack of practical assessment of the real situation of resource recovery rate. Most of the leaders just think that the production of working face is higher than that of caving coal, and the mining rate of working face is definitely higher. Some people even think that the waste rock has been released and the recovery rate has exceeded 100%.