basic roof

常見例句

Basic roof and immediate roof of horizontal section top coal caving were beside the working face in steep seams.
運(yùn)用彈性薄板理論對(duì)急斜煤層水平分段放頂煤開採基本頂巖層進(jìn)行拉應(yīng)力分析，得出了頂板破斷的判別準(zhǔn)則。
By using the mechanics theory to analyze the character of roof moving and deformation after coal mining, the conclusion is gotten that the basic roof will not fail.
竝運(yùn)用相關(guān)的力學(xué)理論，分析置換開採後頂板的運(yùn)動(dòng)和變形特征，得出基本頂不會(huì)破斷，地表變形沒有超過建築物允許變形範(fàn)圍。
The result shows that the weighting of pillar-wall mining is great for the basic roof, uniform for working face, and moderate or a little greater than moderate in middle area.
柱壁式綜採法是在已掘巷柱式採區(qū)內(nèi)佈置長壁工作麪，竝用綜採成套設(shè)備廻採的採煤技術(shù)。