1) critical ratio of depth mining and thickness mining
临界采深采厚比
2) ratio of depth mining and thickness mininging
采深采厚比
3) critical exploitation depth
临界开采深度
1.
The author analyses the problems existing in Changcun such as gas effusing,and forecast gas effusing quantity of section of relaying exploitation,and regional gas contrelling by means of ventilation and critical exploitation depth.
分析了目前常村矿瓦斯涌出和治理存在的问题 ,预测了接替采区瓦斯涌出量 ,利用通风方法能够治理的瓦斯区域和临界开采深
4) mining depth and mining height ratio
采深采高比
5) critical ratio of width to thickness
临界宽厚比
6) critical extraction distance
临界采动距
1.
When it is near to the critical extraction distance, the rate of mining subsidence increases sharply and the mining subsidence ratio(q′/q)has the relation of negati.
当开采宽度达到地表移动起动距时,地表下沉缓慢增长;达到临界采动距时,地表下沉急剧增大。
补充资料：董采
董采
董采 清代医家。字载臣。浙江桐乡人。善文辞，精医学，晚年居金陵行医。著有《方论质疑》、《西锦集方论》、《质疑远游草》。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
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