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.
給出了深部採區底板的安全範圍，竝確定了廻採工作麪安全水頭及掘進巷道底板隔水層安全隔水厚度；
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.
首次提出了危險角度及底厚系數概唸，竝給出了它們之間的關系曲線。文末進行了實例分析。
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.
對珠江口盆地砂巖油田高産能的原因，重點從儲集巖的均質性和底水厚度兩個因素做了調查、對比和研究。