based on the theory of gas flow in confined coal seams and taking into account the characteristics of gas flow in semi-confined coal seams,the paper deduced the differential equation of gas flow in semi-confined coal seams with both isotropic and anisotropic permeability,thus built the mathematical model of gas flow in semi-confined coal seams.
当煤层上覆岩层和底部岩层为致密岩层、透气性极小时,可以认为完全不透气,则含瓦斯煤层为承压煤层;当煤层上覆岩层和底部含有一定的裂隙,其渗透系数与含瓦斯煤层相比虽然很小,但仍然有少量瓦斯通过透气性较低的上下岩层流入或流出含瓦斯煤层,此时含瓦斯煤层为半承压煤层。
Influence of strike fault to gently inclined narrow orebody and mining countermeasure;
走向断层对缓倾斜薄矿体开采的影响及开采对策
Nevin to determine the stratigraphic duplicate and incompletement caused by the strike fault,the method is complicated and trivial.
构造地质学对走向断层造成的地层重复，缺失一直沿用Ｃ。
Strike Coal Pillar Affected to Strata Pressure of Fully Mechanized Longwall Mining Face with High Cutting Height in Closed Distance Seam
走向煤柱对近距离煤层大采高综采面矿压影响
Three Anti-Measures for Strike Longwall Retreating Mining In Sloping Coal Seam
倾斜煤层走向长壁后退式采煤法的三防措施
On the effective ways for coal mines to become more involved in internationalization;
试论煤炭企业走向国际化的有效途径
One year after the outbreak of the global financial crisis:China's coal economy and coal industry policy trends
金融危机一年来的煤炭经济运行与煤炭工业政策走向
Top coal cracking and migration law of fully mechanized top coal caving mining face in steep inclined and thick seam strike
大倾角厚煤层走向长壁综放面顶煤破碎及移动规律
The Trend in Cyclic Economy of Coal Resources Development in Our Country;
我国煤炭资源开发在循环经济发展中的走向
Practice and development trend of Sci-tech innovation management in coal mining enterprises;
煤矿科技创新管理的基本实践与未来走向
Practice and Basic Trend of Sci-tech Innovation Management of Coal Mining Enterprises;
煤矿企业科技创新管理的实践与基本走向
Considerations about the Direction of the Current Cultural Construction of State-owned Coal Enterprises
对当前国有煤炭企业文化建设走向的思考
Characteristics of strata behaviors of the long-wall full-mechanized caving mining field on strike of steeply thick coal seam
大倾角特厚煤层走向长壁综放采场矿压特征
Degree of metamorphism steps up along the strike from south to north, whereas steps up along the dip in company with depth.
在走向上煤的变质程度由南向北逐渐增高,在倾向上煤层随赋存深度的增大变质程度逐渐增高。
In the colonnade outside the theatre, a young servant came up to the two women.
在剧场的圆柱走廊里有一个小厮向她们迎上前来。
gas is leaking from the pipe.
煤气管道走气了。The
pillar of ground
运输平巷上方的煤柱
Reinforcement Mechanism of Anchored Bolt for Coal Pillar and Analysis of Influence Factors of Pillar Strength
煤柱锚杆加固机理与煤柱强度影响因素分析
Second Mining under Isolated Pillar Left by Wedge-pillar Mining Method
刀柱复采跨隔离煤柱布置探索与实践
The E-Commerce is a required means for coal factory in china to be more comparative and to go to the world.
电子商务是煤炭工业企业增强竞争力、走向世界的必备手段。
SITUATION AND CHALLENGES FOR COAL-BED METHANE INDUSTRIALIZATION IN CHINA (Ⅲ)-TREND AND PIONEER RESEARCH;
中国煤层气产业化面临的形势与挑战(Ⅲ)——走向与前瞻性探索