The author systematically studies the distributive Law of front abutment pressure and its main influential factor in Top-coal caving face by analysing theory,experimenting similar model,and observing spot.

運(yùn)用理論分析澳门人人摸人人操、相似模型實(shí)驗(yàn)和現(xiàn)場實(shí)測视屏久久，系統(tǒng)研究了放頂煤采場前支承壓力的分布規(guī)律及其主要影響因素，得出支承壓力表達(dá)式( 3)丰满少妇A级毛片野外、( 7)是可信的欧美专区11页，塑性區(qū)寬有利于頂煤壓裂，峰值低影響硬煤冒放中国产精品国产三级，放頂煤一次采厚是有限

Through similar simulation test of block top-coal drawing, the influence of coal block size and block position in top coal on the recovery ratio and drawing manner is studied. It is found that the drawing manner has the different adaptation to the top coal which has different block distribution. The caving capacity is mainly decided by the block size. The top-coal which has layer difference of block with the same size has different recovery ratio. It is shown, that, to the given top-coal blocks, the recovery ratio of uniformly mixed blocks is maximal in the manner of drawing at interval of one support.

研究表明免费美女黄，頂煤塊體大小是影響頂煤回收效果的主要因素，在頂煤塊徑一定的條件下真人黄色视频免费的，塊體層位分布不同是造成頂煤回收率差異的主要原因特黄一级免费视频，研究表明各級塊度均勻混合時(shí)頂煤回收效果最好，塊度從下向上增大分布次之手机在线看永久AV片免费无毒，大塊為中位頂煤時(shí)回收效果最差美女黄网站一区二区；各種放煤方式的適應(yīng)性不同，各級塊度均勻混合的頂煤適合用間隔放煤精品推荐本地黄色视频；塊度從下向上增大適合用順序放煤欧美一级,日韩三级；大塊在頂煤中位分布時(shí)，中硬煤以下適合用間隔放煤在线播放你懂的网站，硬煤應(yīng)采用順序放煤方式亚洲黄色视频电影。

Both of the new hard coking coal assessments reflect quality of 64% minimum coke strength after reduction, 9% maximum air dried ash, and 25.5% maximum air dried volatile matter, with recognized premium hard and hard coking coals of differing quality normalized to the Platts specification basis.

上述兩種新硬煉焦煤估價(jià)反映的質(zhì)量均為還原后強(qiáng)度不小于64%，風(fēng)干灰分不大于9%国产a√视色，風(fēng)干水分不大于25.5%手机看片1024人妻久久性色，認(rèn)可的優(yōu)質(zhì)硬煉焦煤和質(zhì)量不同的硬煉焦煤按照普氏的規(guī)格基準(zhǔn)進(jìn)行正常化處理www簧片网址视频。

And proposes that f value is regarded as the classification quota of hard coal and tectonic soft coal.

并提出將f值作為硬煤和構(gòu)造軟煤的分類指標(biāo)av超碰av超碰人人爱。

Coal, mining, construction machinery categories: processing, manufacturing coal pulverizer Dao, the knife's edge spray super-hard alloy, to improve the life of more than five times.

煤碳、采礦日韩AAAAAA免费毛片、建筑機(jī)械類：加工bbixxcon在线观看、制造煤碳粉碎機(jī)刀把，在刀刃上噴焊超硬合金日本特级黄色大片天天高潮免费看，使用壽命能提高五倍以上国内99在线。

It is important to reduce the span of the hard roof to avoid its impact load on supports. However, at longwall top coal caving face, the periodical weight of roof is a main factor that crushes the top coal, which is beneficial to the top coal recovery. How to use the roof pressure safely is of crucial importance in top coal caving. Based on field monitoring, theoretical analysis of strata movement, the numerical model of compound structure of hard roof stepped cantilever and the top coal cantilever beam is built, and the parameters of the model are also determined. The elasto-plastic finite element method is used to analyze the effect of hard coal fracture under the abutment pressure of hard roof, and the cracking coefficient is defined according to the stress state of the element.

通過對巖層移動的現(xiàn)場觀測，建立了&兩硬&條件綜放采場臺階懸臂—懸臂梁組合的煤巖組合結(jié)構(gòu)力學(xué)模型欧美草草操在线视频，并以此煤巖結(jié)構(gòu)為基礎(chǔ)女人18毛多水多在线观看，建立&兩硬&條件綜放采場頂煤壓裂的有限元數(shù)值模型，分析了堅(jiān)硬頂板不同來壓步距對堅(jiān)硬頂煤的壓裂效應(yīng)好了AV四色综合无码久久下载，并確定了合理的支架阻力欧美老人黄片，從而對堅(jiān)硬頂板進(jìn)行有效的控制无码码一区精品品和亚洲洲，消除堅(jiān)硬項(xiàng)板對采場的沖擊隱患怡红院最新地址，同時(shí)保證采場礦壓對堅(jiān)硬頂煤的有效壓裂久久视频一二区，達(dá)到提高頂煤回收率之目的，由此形成了堅(jiān)硬頂煤69视频在线免费看、堅(jiān)硬頂板條件下綜放采場圍巖控制的基本理論和方法国产欧美精品亚洲AMV。

The top coal fracture is described distinctly under the condition of different roof span and mining technology parameters. Through orthogonal experiment of numerical simulation, the rational pretreatment span of hard roof is determined, and the rational working resistance of support is selected also. As a result: the hard roof is effectively controlled not only to protect the working face but also to promote the caving of hard top coal to increase the recovery ratio.

在有效控制堅(jiān)硬頂板的基礎(chǔ)上，利用數(shù)值模擬正交試驗(yàn)法动漫无码av永久免费专区，研究了采高人人插人人爽爽人人干射、采放比、支架阻力欧美黄色网站免费的、放煤步距等工藝參數(shù)對頂煤壓裂效果的影響規(guī)律午夜福利小黄片，從而對工作面工藝參數(shù)進(jìn)行優(yōu)化；并根據(jù)實(shí)驗(yàn)所得放煤方式對塊體頂煤的適應(yīng)性規(guī)律狼友免费观看不卡网站，選擇&兩硬&綜放面的放煤工藝a亚洲A片视频网，從而形成了系統(tǒng)、完善的&兩硬&條件綜放工藝最新的毛片网址。

Front of industry of whole Europe hard coal is facing the economic situation of 20 century later period.

整個歐洲硬煤工業(yè)正面臨著20世紀(jì)后期的經(jīng)濟(jì)形勢一级a做片免费看欧美一。

Evonik is a global leader in specialty chemicals, an expert in power generation from hard coal and renewable energies, and one of the largest private residential real estate companies in Germany.

贏創(chuàng)是全球領(lǐng)先的特種化學(xué)品供應(yīng)商，也是硬煤與可再生能源發(fā)電方面的專家91自拍最新地址，同時(shí)還是德國最大的私人房地產(chǎn)公司之一免费Jizz国产精品网站。

Hard coal and coke - Mechanical sampling - Part 7: Methods for determining the precision of sampling, sample preparation and testing

硬煤和焦炭機(jī)械化采樣第7部分：采樣精度測定方法，樣品制備方法及試驗(yàn)方法

anthracite：無煙煤,硬煤

ante-venna 遮陽幕[板] | anthracite 無煙煤,硬煤 | anthrafine 無煙煤末

splint coal：暗硬煤

硬板煤 splent | 暗硬煤 splint coal | 多片狀的 splintery

stone coal：石煤,塊狀無煙煤,硬煤

stoker 機(jī)動爐排 | stone coal 石煤,塊狀無煙煤,硬煤 | stone cutting machine 切石機(jī)

coal stone：硬煤

coal step 煤階 | coal stone 硬煤 | coal tar coating 煤焦油涂層

gas coal：氣煤

較煙煤更高的硬煤揮發(fā)分低無粘結(jié)性燃點(diǎn)高燃燒時(shí)不冒煙 1.22 硬煤(hard coal) 煙煤和無煙煤的總稱 1.23 長焰煤(long-flame coal) 變質(zhì)程度最低揮發(fā)分最高的煙煤燃燒時(shí)產(chǎn)生長火焰一般不結(jié)焦 1.24 氣煤(gas coal) 變質(zhì)程度較低而揮

splent：硬板煤

夾骨 splenial | 硬板煤 splent | 暗硬煤 splint coal

splent coal：暗硬煤

splendor 光輝;壯麗;顯赫 | splent coal 暗硬煤 | splice box 編接盒

hard coal：硬煤

(bituminous coal) 煤化程度高于褐煤而低于無煙煤的硬煤揮發(fā)分范圍廣結(jié)焦性相互差別大燃燒時(shí)冒煙 1.21 無煙煤(anthracite) 煤化程度較煙煤更高的硬煤揮發(fā)分低無粘結(jié)性燃點(diǎn)高燃燒時(shí)不冒煙 1.22 硬煤(hard coal) 煙煤和無煙煤的總

hard coal：硬煤無煙煤

硬煤素群 micrinoid | 硬煤無煙煤 hard coal | 硬錳礦 psilomelane

coal hard：硬煤

輸煤設(shè)備,輸煤裝置 coal handling equipment | 硬煤 coal hard | 犁煤機(jī) coal plough