1) stability grading of coal seam
煤层稳定型别
2) unstable coal seam
不稳定煤层
1.
Longwall mining along the dip of the unstable coal seam and strata control;
不稳定煤层倾斜长壁开采及矿压控制
2.
According to the analysis of the feature and origin of unstable coal seam,the article introduces the corresponding methods of developing and mining district preparation,which provide a technological reference for extracting unstable coal seam.
通过不稳定煤层的特点及成因分析,采取与之相适应的开拓及采区准备方法,为开采不稳定煤层提供了参考。
3.
The raining of unstable coal seam is a thorny thing for miner.
不稳定煤层的开采,历来是采矿工作者的棘手问题。
3) coal bed's stability
煤层稳定性
4) stable and thick coal bed
稳定厚煤层
5) coal roof stability
煤层顶板稳定性
1.
Coal roof faulted structure is most important factor to influence coal roof stability.
煤层顶板断裂构造是煤层顶板稳定性影响因素中最重要的因素,以兖州煤田鲍店煤矿为例,分析了兖州煤田顶板断裂构造特点,探讨其对煤层顶板稳定性影响,分析了小断裂对煤层顶板的稳定性影响,断裂密集区的煤层顶板最易垮落,特别是交错断裂区更易产生顶板垮落式冒顶。
2.
3 coal roof stability is mainly influenced by roof structure and lithology,therefore quantizing the two factors first,through 3D seismic prospecting comprehensive interpretation and wave impedance inversion interpretation,then normalized wave impedance data,made the impedance data and quantized structure data .
考虑3煤层顶板稳定性主要受其顶板的构造信息和岩性信息影响,因此首先依据三维地震勘探综合解释成果及波阻抗反演解释成果对二者进行定量化,然后对波阻抗数据进行归一化处理,使得波阻抗数据和量化后的构造数据具有相同的变化范围及等量贡献。
6) inclined and unstable seam
倾斜不稳定煤层
1.
Introduced the technical experiences and the main safe measures as will as the technical and economic benefits adopted in sublevel caving mining with blasting method appied to 27°-32° inclined and unstable seam in Baimiao coal mine.
介绍了白庙煤矿在２７°～３２°倾斜不稳定煤层中采用炮采放顶煤开采的技术经验、主要安全技术措施及取得的技术经济效果。
补充资料：受别
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