main seam 中文意思是什麼
main seam
解釋
主煤層-
The main chromitite seam and the merensky reef do not outcrop well.
主鉻鐵巖礦層及麥侖斯基礦層出露不好。 -
Through analyzing on the different phenomena of gas pouring amount at different coal seam, different area at the same seam, different position at the same area, the coal thicknss, inclined angle, structure, roof and floor rock character and water content in coal est. geology factor are regarded as the main reason of effecting the gas pouring amount
通過對不同煤層，同一煤層不同區域，同一區域不同地點瓦斯湧出量有很大差異現象的分析，認為煤層厚度、傾角、構造、頂底板巖性、煤中水分等地質因素是影響瓦斯湧出大小的主要原因。 -
From the beginning of sq9 ' s development, the sedimentary environment turn to be lake basin bog. with water becoming shallow, coal seam appeared in lowstand system tract, delta plain and delta front are the main sedimentary bodies in highstand system tract
從層序9開始，水體開始變淺，向湖沼環境過渡，低水位體系域和水進體系域出現了煤線，高水位體系域以三角洲平原及三角洲前緣沉積為主。 -
The main features are that the back surface weiding seams are even, smooth and weld edge tidy, excellent in performances of welding technology and welding seam dynamics
主要特點是背面焊縫勻稱、光滑，焊趾整齊，焊接工藝性能及焊縫力學性能優良。 -
In accordance with the occurrence behavior of roof strata and the fracture characteristics of key stratum in shallow seam longwall mining, studied post - buckling behavior of roof key stratum in the process of mining by using initial post - buckling theory, which derived a critical load and a breaking span of the main roof during the first weighting, determined the final subsidence and the maximum rotation angle for broken key stratum, and presented an application with the example of daliuta 1203 face
摘要根據淺埋煤層頂板巖層的賦存特點和長壁開采時關鍵層的變形破斷特徵，應用初始后屈曲理論探討了開采過程中頂板關鍵層的后屈曲性態，得出了老頂初次來壓時頂板的臨界載荷和破斷步距，確定了頂板破斷后的極限下沉量和回轉角，並以神東礦區大柳塔1203工作面為例給出了工程實例。 -
Considering the artificial fracture as the refracture upon the horizontal seam, putaohua oilfield is taken as the target and the following tasks have be done : define well and stratum selection method for refracturing ; determine the refracturing time with well test analysis and flow index method ; find out the main cause of refracturing failure
摘要針對大慶油田長垣人工裂縫為水平縫的重復壓裂井，以葡萄花油田為研究對象，初步界定了重復壓裂選井選層工藝方法；應用試井分析和流動指數方法判斷重復壓裂時機；經過研究找出了重復壓裂井裂縫失效的主要原因。 -
Supporting patterns of main roadway when passing soft seam and rock
大巷過軟煤巖段支護方式探討 -
Based on main factors influencing degree of level for bitumen road surface under construction, the paper puts forward measures to improve degree of level of bitumen road surface for urban road construction including how to practice seal construction, how to choose suitable machinery and technology and how to handle cross wide contact seam
摘要根據影響瀝青面層施工平整度的主要因素，從實行封閉式施工、選擇先進適用的攤鋪機械和攤鋪工藝以及橫向接縫的處理3個方面，提出提高城市道路瀝青面層平整度的措施。 -
Analysis of burst tendency of the main coal seam in jining no. 2 coal mine
濟寧二礦煤層沖擊傾向性分析 -
According to the hydrogeology character, water point distributed rule and water amount dynamic in balitang coal mine, for mining steep coal seam under water, the prevention and cure measures were provided, which were " ， dredging " ， and " ， drawing " ， are main and " ， blocking " ， and " ， hinding " ， are auxiliary
從礦井水文地質特徵、出水點分佈規律及水量動態入手，對於水體下開采急傾斜煤層的八里塘煤礦，針對性地提高「疏、排」為主、 「堵、躲」為輔的綜合水害防治措施。 -
Characteristics of main seam ' s coal quality of shanbei jurassic coalfield and its utilizing prospect
陜北侏羅紀煤田主要煤層煤質特徵及利用方向
分享友人