Dynamic analysis of the initial caving process of roof coal seam in roof caving coal face;
放顶煤开采顶煤初次垮落动力学分析
Through observing the practical mine pressure of Changgou mine's working face,including the pace of top coal collapsing initially,the pace of direct roof rock collapsing initially,the pace of basic top pressing initially and its intensity,and the pace of the basic top pressing periodically and its intensity,the paper has researched the rule of stope's mine pressure.
对长沟煤矿工作面进行了实际矿压观测,包括顶煤初次垮落步距、直接顶岩层初次垮落步距、基本顶初次来压步距及其来压强度、基本顶周期来压步距及其来压强度,分析研究了采场矿压规律。
Using this model,we have simulated the roof caving characteristic and the stress distribution of surrounding rocks and analyzed the deformation feature of the surrounding rocks in the working face end.
02D数值模拟软件建立相应的分析模型,模拟了煤层开采过程中的顶板垮落和围岩应力分布特征,重点分析了工作面上下端头的围岩应力分布规律及变形特点;结合具体生产矿井的综采工作面现场情况,得出了综采工作面推进过程中的周期来压、采动影响范围和煤壁片帮等矿压显现特征,并针对开采中出现的问题提出了相应的安全防范措施。
Main roof first collapse law and measure of controlling roof in seam with approximate shallow depth
近浅埋煤层老顶初次垮落规律及控顶措施
Roof breaking law along top-coal caving face
综放开采沿工作面倾向顶板垮落规律
Haines from the corner where he was knotting easily a scarf about the loose collar of his tennis shirt spoke:
海恩斯在角落里正松垮垮地往他的网球衫那宽松领口系领巾，他说：
All of these year-end parties are going to ruin my health.
这么多次年终联欢会，会把我累垮的。
All beat her-because of her backwardness, because of her military backwardness, cultural backwardness, political backwardness, industrial backwardness, agricultural back wardness.
谁都能打垮它--因为它落后，军事落后，文化落后，政治落后，工业落后，农业落后。
The Theoretical Study on Cyclone Disaster Caused by Stope Roof Falling over Great Extent;
采场顶板大面积垮落的飓风灾害的理论研究
The ConstructionAnalysis of Anti-Well Method Through Falling Soft Rock Section
反井法施工立井井筒过软岩垮落段实践分析
Modeling Experiment for the Rock Movement During Grouting Backfill in Caving Area with Strip Mining
条带间垮落区注浆充填覆岩移动规律研究
Application of short wall fully caving coal mining method in Shendong coal mine area
短壁全部垮落采煤法在神东矿区的应用
Numerical model of nonlinear flow-diffusion for gas mitigation in goaf and atmosphere
采空垮落区瓦斯非线性渗流-扩散模型及其求解
Research on Air Bumping Disaster Induced by Large Roof Falling in Goaf
采空区顶板大面积垮落的空气冲击灾害研究
Research On Mining Technology of No-pillar Complete Caving Shortwall Mechanization
无煤柱完全垮落短壁机械化开采技术研究
DETERMINING THE HEIGHT OF COLLAPSE AND FRACTURE ZONE WATER-TRANSMITTING IN MINED-OUT AREA BY MEANS OF BOREHOLE
利用钻孔确定采空区垮落带和导水裂隙带高度
Once again when initial productivity gains had been absorbed, the rate of population growth abated.
一旦最初的生产力增长被吸收殆尽，人口的增长再次衰落。
A Preliminary Study on the Structure of Breeding Birds Community under the Influence of Artificial Nest Boxes in the Secondary Forest;
人工巢箱作用下天然次生林繁殖鸟类的群落结构初步研究
Macrobenthic community and its secondary production in Shenhu Bay
深沪湾大型底栖动物群落及其次级生产力初步研究
Primary Study on the Major Community Types of Betula luminifera Secondary Forests in Northwest Guizhou
黔西北地区光皮桦次生林主要群落类型初步研究
He ran for the senate twice and lost both times.
两次竞选参议员，两次落