2) bottom sandstone
底板砂岩
1.
Based on the analysis of rock group structure,geology force,the VF electricity grasps method in sandstone under coal seam bottom in 6123 working-face,discussed 12 mining area coal seam bottom sandstone,and bring forward the measure of preventing,according to having an effect to guide safety at work for coal seam bottom water burst.
通过对百善煤矿12采区6123首采工作面煤层底板岩石组构、构造受力、音频电透视资料的分析,探讨了12采区煤层底板砂岩的富水性及富水性分区,提出了防治底板水的措施,为煤层底板突水预测与防治提供了依据。
3) sandy slate
砂质板岩
5) sandstone and slate
砂岩和板岩
1.
The aggregate used in the roller compacted concrete at Gongguoqiao hydropower station was the excavated material from underground caverns which relied on sandstone and slate.
功果桥碾压混凝土采用的骨料为地下洞室开挖料,骨料岩性以砂岩和板岩为主。
6) grit stone roof
粗砂岩顶板
1.
This paper analyzes on the distributing regulation of the grit stone roof of No.
分析了大同煤田同家梁井田11号煤层顶板粗砂岩的分布规律以及粗砂岩顶板岩性对综采工作面回采的危害,根据粗砂岩顶板的特点及工作经验针对性地提出了开采对策。
补充资料：粉砂岩
| 粉砂岩 siltstone 由粒径为0.0625～0.0039毫米（mm）的粉砂的含量占50％以粉砂岩标本的一种碎屑沉积岩。除粉砂以外其它由砂、粘土或化学沉淀物组成。按粒度划分为粗粉砂岩（0.0625～0.0312mm）和细粉砂岩（0.0312～0.0039mm）。按碎屑成分划分为石英粉砂岩、长石粉砂岩、岩屑粉砂岩（少见）和它们间的过渡类型。根据胶结物成分划分为粘土质粉砂岩、铁质粉砂岩、钙质粉砂岩和白云质粉砂岩。黄土也是一种疏松的或半固结的粉砂质沉积物。粉砂岩多形成于河漫滩、三角洲、潟湖和海洋的较深水部位。
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参考词条