longwall mining

常見例句

This is the beginning of longwall mining.
這是長壁開采的開始。
Analyses the factor that effect on the percentage of recovery in longwall mining with caving coal face, approaches the access to raise the percentage of recovery.
分析了影響綜采放頂煤回收率的因素，探討了提高回采率的途徑。
Based on the model of mechanics, some functional formulae of strata and surface movement above longwall mining goaf are derived by using the displacement method of theory of elasticity.
本文在力學(xué)模型的基礎(chǔ)上，利用彈性理論的位移函數(shù)法導(dǎo)出了長壁采煤法采空區(qū)上方巖層及地表移動的函數(shù)表達(dá)式，同時給出了巖層及地表最大移動值的計算公式。