4) main roof
老顶岩梁
1.
Break of main roof ahead of workface and ground pressure;
采场老顶岩梁的超前破断与矿山压力
5) roof overburden
顶板覆岩
1.
Pressure releasing and gas drainage with long bore hole in roof overburden of fully mechanized caving face;
综放面顶板覆岩走向长钻孔卸压抽放瓦斯研究
6) roof rock
顶板岩块
1.
Rock structure formed of the break of roof rock along the slope in the steep-dipping longwall face is thoroughly analysed.
本文就急斜长壁工作面顶板岩层沿倾向断裂后形成的岩块结构进行深人分析,推导出岩块间的内力计算公式,得出顶板岩块沿倾向形成“非对称三饺拱”结构,对顶板控制有实际意义。
补充资料：白云石,白云岩,石灰岩
CAS：1317-65-3
中文名称：石灰石；电石灰岩；石灰石粉；霰石,文石；方解石,碳酸钙晶体；碳酸钙,白垩；白云石,白云岩,石灰岩；石灰石,石灰石；大理石,大理岩,云石,玻璃球；波特兰石；白垩,磨细白垩粉,白垩粉
英文名称：Limestone；Agstone；agricultural limestone；aragonite；atomite；bell mine pulverized limestone；calcite；calcium carbonate；carbonic acid, calcium salt；chalk；dolomite；domolite；franklin；lithograpic stone；marble；natural calcium carbonate；portland stone；sohnhofen stone；whiting；limestone,powder；flux lime
中文名称：石灰石；电石灰岩；石灰石粉；霰石,文石；方解石,碳酸钙晶体；碳酸钙,白垩；白云石,白云岩,石灰岩；石灰石,石灰石；大理石,大理岩,云石,玻璃球；波特兰石；白垩,磨细白垩粉,白垩粉
英文名称：Limestone；Agstone；agricultural limestone；aragonite；atomite；bell mine pulverized limestone；calcite；calcium carbonate；carbonic acid, calcium salt；chalk；dolomite；domolite；franklin；lithograpic stone；marble；natural calcium carbonate；portland stone；sohnhofen stone；whiting；limestone,powder；flux lime
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条