1) under-group coal seams
下组煤
1.
To understand the structures in under-group coal seams a technical idea is provided, which proposes with analogy analysis method forecast the under-group coal seams structure based on data obtained during coal mining.
提出了采用构造类比的方法,利用上组煤开采揭露资料对下组煤构造进行预测的技术思路,以解决下组煤构造不清的问题。
2.
The geologic conditions for mining coal of the under-group coal seams are analyzed.
分析与研究了兖矿集团南屯煤矿下组煤开采地质条件,细致地划分出下组煤可采煤层顶板岩性分区图,分析总结了下组煤顶、底板岩性特征以及对生产支护产生的影响。
2) roof of the bottom coal
下组煤顶板
3) underlie coal seams
下覆煤层组
1.
Control technique of surrounding rock stability for main entry with underlie coal seams mined
下覆煤层组开采大巷围岩稳定性控制技术
4) lower coal group aquifer
下组煤充水含水层
5) coal mine underground
煤矿井下
1.
Study on scheme of IF mobile communication in coal mine underground;
煤矿井下中频移动通信技术方案研究
2.
The status of mobile communication in coal mine underground is introduced, the difficult technical problems including laneway infection for wireless transmission and weak signal reception and noise interference are analyzed, and ways to solve these problems are proposed.
介绍了我国煤矿井下移动通信现状,分析了技术上的难题-巷道对无线传输的影响、弱信号接收和井下环境噪声干扰,提出了解决途径。
3.
To solve the problem of frequent over-grade trip of fast short-circuit protection in high voltage power supply system of coal mine underground,a scheme of adaptive protection system based on independent substation was proposed.
针对煤矿井下高压供电系统速断保护经常越级跳闸的问题,提出了一种基于独立分站的自适应保护系统方案。
6) coal pillar under buildings
建下煤柱
1.
Extraction through tunnel,as a supplement of traditional mine coal with coal pillar under buildings,is a kind of special coal mine with narrow strip which is suitable in mine coal with shallow pillar under buildings and has been successfully utilized in practice.
作为传统建下煤柱开采方法的补充,适用于浅部建下压煤开采,已经成功地运用在实践中。
补充资料：煤的镜质组反射率
煤的镜质组反射率
reflectance of vitrinite in coal
mei de如夕hjzll fan劝el五煤的镜质组反射率(r eflectauceofvitrinite in eoal)镜质组在绿色光(几~546lun)中的反射光强相对于垂直入射光强的百分比。是煤岩学的研究内容之一口煤的镜质组反射率是表征煤化度的重要指标。各种煤若显微组分的反射率均随煤化度加深而增大，这反映了煤的内部由芳香稠环化合物组成的核的缩聚程度在增长，碳原子的密度在增大。但各煤岩显微组分的反射率随煤化度变化的速度有差别，其中以镜质组的变化快而且规律性强。镜质组是煤的主要组分，颗粒较大而表面均匀，其反射率易于测定。而且，镜质组反射率与表征煤化度的其他指标(如挥发分、碳含量)不同，它不受煤的岩相组成变化的影响，因此是公认的较理想的煤化度指标，尤其适用于烟煤阶段。中国煤的镜质组反射率与干燥无灰基挥发分(见煤的分析)
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