bottom thickness

基本解释

The safety of deep mining area bottom is given, and determine the roadway drivage of working face safe water and bottom water thickness of water-resisting layer security.
给出了深部采区底板的安全范围，并确定了回采工作面安全水头及掘进巷道底板隔水层安全隔水厚度；
This paper puts forward conceptions of dangerous angle and bottom-thickness coefficient for the first time, gives out relation curves between them and makes analysis with actual examples.
首次提出了危险角度及底厚系数概念，并给出了它们之间的关系曲线。文末进行了实例分析。
Reservoir homogeneity and bottom water thickness are mainly investigated, compared and studied in order to understand why the sand reservoirs in Pearl River Mouth Basin is with higher productivity.
对珠江口盆地砂岩油田高产能的原因，重点从储集岩的均质性和底水厚度两个因素做了调查、对比和研究。