lower seam 中文意思是什麼

lower seam 解釋
低層
  • lower : adj 〈low 的比較級〉1 較低的。2 下級的，低級的。 lower animals 下等動物。3 南部的。 in lower Manh...
  • seam : n 1 縫；線縫。2 介面；接縫；接合處；接合線。3 裂縫。4 （臉上的）皺紋。5 傷痕。6 【造船】（船板間...
  1. Discussion on the feasibility of comprehension machine for lower high seam

    西山部分煤田煤層綜放開採的可行性探討
  2. For the tectonic coal ， the properties of higher porosity and lower permeability make it capable of keeping higher gas pressure ； both of the “ isolating action ” and “ gas - cushion action ” cut down the resistance against outburst ； the specifity of high - defomed - extent makes desorption ， escape and flowing quickly become possible ； the existing of weak - seam or “ thoroughfare - seam ” create suitable conditions for the initial erupting and continued developing of coal and gas outburst. on the whole ， it is the synhesis action of all factors ， which leads to outbursts. the existing of tectonic coal with certain thickess is the essential condition of coal and gas outbursts ， but not the sufficient condition

    高空隙率、低透氣性使構造煤能夠保持較高的瓦斯壓力；破碎性、 「隔離」作用及「氣墊」作用，使構造煤抵禦外力作用的能力大大降低；構造煤變形幅度大的特性，為瓦斯的迅速解吸、放散和快速流動創造了條件；構造煤薄弱分層或「通道層」的存在，則為煤與瓦斯突出的初始激發和持續發展奠定了基礎；上述因素的共同作用，影響和制約了煤與瓦斯突出的強度和分佈.盡管如此，一定厚度的構造煤的存在只是發生煤與瓦斯突出的必要條件和有利條件，而非充分條件
  3. Analysis on water isolation layer conditions of taiayuan group lower coal seam mining of hebi coal mine

    鶴壁礦區開采太原群下組煤的隔水層條件分析
  4. Hydrogeological condition for coal mining of lower coal seam group in nantun coal mine

    南屯煤礦下組煤開采水文地質條件
  5. Gas control at air return conner angle in lower fully mechanized face of no. 23 seam in no. 2 jining mine

    濟寧二號煤礦23下00綜放面回風隅角瓦斯治理
  6. Similar simulation study of pressure - relief protection angle during extraction of long - interval lower protective seam

    開采遠距離下保護層卸壓保護角的相似模擬研究
  7. Practise in combined mining roof caving coal at lower position in large angle thick coal seam

    大傾角厚煤層低位綜采放頂煤實踐
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