longwall mining

常见例句

This is the beginning of longwall mining.
这是长壁开采的开始。
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.
分析了影响综采放顶煤回收率的因素，探讨了提高回采率的途径。
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.
本文在力学模型的基础上，利用弹性理论的位移函数法导出了长壁采煤法采空区上方岩层及地表移动的函数表达式，同时给出了岩层及地表最大移动值的计算公式。