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1.
本文应用模型实验、图像分析、离散元模拟等方法,对上覆岩层采动裂隙分布特征进行了研究。揭示了长壁工作面覆岩采动裂隙分布的两阶段特征与“○”形圈特征,建立了卸压瓦斯的“○”形圈抽放理论,并将其应用于淮北矿区卸压瓦斯的抽放,取得了显著效果。 相似文献
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覆岩采动裂隙分布特征的研究 总被引:16,自引:0,他引:16
本文应用模型实验,图像分析,离散元模拟等方法,对上覆岩层采动裂隙分布特征进行了研究。揭示了长壁工作面覆岩采动裂隙分布的两阶段特征与“O”形圈特征,建立了卸压瓦斯的“O”形圈抽放理论,并将其应用于淮北矿区卸压瓦斯的抽放,取得了显著效果。 相似文献
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分析了回采工作面回采过程中顶板覆岩卸压移动规律及其顶板覆岩结构与关键层层位对覆岩移动规律的影响,提出了利用采动煤层顶板覆岩卸压裂隙发育特征,实施覆岩卸压区走向长钻孔抽放瓦斯.给出了顶板走向长钻孔卸压抽放的合理布置区域,并在抽放钻孔内下入套管,增加了钻孔有效抽放时间和长度,完善了顶板走向钻孔抽放瓦斯的技术,取得较为理想的瓦斯抽放效果. 相似文献
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应用上覆岩层采动裂隙“O”形圈特征抽放采空区瓦斯 总被引:8,自引:1,他引:8
本文应用相似材料模型试验和图象分析技术对芦岭矿8煤一分层上覆岩层采动裂隙分布特征研究的结果表明,在采空区四周存在一离层裂隙发育的“O”形圈,它是采空区卸压瓦斯流动通道和贮存空间。应用上覆岩层采动裂隙及其“O”形圈特征,提出了大面积抽放芦岭煤矿8煤一分层采空区卸压瓦斯的合理钻孔布置方案。 相似文献
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采动裂隙椭抛带分布特征的相似模拟实验分析 总被引:3,自引:0,他引:3
煤层开采后,覆岩采动裂隙分布特征与卸压瓦斯抽采密切相关。基于相似原理,进行了覆岩采动裂隙分布特征的物理相似材料模拟实验。根据实验中裂隙带及压实带的拟合曲线,说明覆岩采动裂隙分布特征是椭抛带形态。通过观测覆岩裂隙的裂隙密度、离层率、带宽及碎胀特征,进一步研究了采动裂隙椭抛带的发育、发展规律。最后在试验分析的基础上,推导出采动裂隙椭抛带的空间分布数学模型,为确定合理的卸压瓦斯抽采钻孔终孔位置提供了依据。 相似文献
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开采煤层顶板抽放瓦斯流场分析 总被引:11,自引:1,他引:10
论述了沿开采煤层顶板走向布置钻孔或巷道抽放瓦斯的基本原理及煤层顶板覆岩采动裂隙分布特征。应用流场理论分析了实施顶板抽放瓦斯技术前后采煤工作面上隅角和采空区 -顶板裂隙 -顶板抽放钻孔或巷道三维区域内的瓦斯流场分布。指出了应用顶板抽放瓦斯技术应注意的关键问题。 相似文献
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针对低瓦斯厚煤层高强综放开采卸压瓦斯治理问题,采用物理模拟、数值分析和现场监测方法,研究工作面开采初期和稳定时期覆岩结构演化及裂隙场分布特征,揭示了考虑采动裂隙场的卸压瓦斯场分布特征;依据研究获得采动瓦斯聚集区分布,提出采用高位定向长钻孔治理采空区卸压瓦斯,并进行了效果检验。结果表明:工作面推进至135 m后,覆岩结构和裂隙演化基本稳定,垮落带发育高度为25~27 m,裂隙带发育高度为75~95 m,弯曲下沉带发育高度达到110 m左右;采动裂隙带瓦斯聚集区位于距回风巷25~55 m、高度距煤层顶板25~50 m范围内;高位定向长钻孔瓦斯抽采技术实施后,抽采平均浓度为5.8%,平均流量为0.71m~3/min,工作面上隅角和回风流瓦斯浓度均小于0.8%,瓦斯治理取得较好效果,为类似条件下的卸压瓦斯治理提供参考。 相似文献
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关键层结构对保护层卸压开采效应影响分析 总被引:1,自引:0,他引:1
由于保护层卸压开采,导致覆岩结构的运动,致使上覆煤层变形,产生卸压效应,改变被卸压煤层的透气特性,为卸压瓦斯抽采创造有利条件.采用RFPA2D-Flow数值模拟软件,分析了上覆煤岩层采动裂隙演化、卸压煤层采动应力及位移分布、瓦斯参数变化等规律,结果表明:1)下保护层开采引起的上覆煤岩层采动裂隙集中分布在采场两端部,并呈竖向偏采空区方向发育,离层裂隙发育至被卸压煤层上方;2)开切眼和停采线附近区域顶板裂隙明显发育,卸压开采导致上覆煤层产生膨胀变形,透气性明显增加;3)由于被卸压煤层和保护层之间关键层结构的力学效应,使被卸压煤层透气系数增加幅度不显著,导致抽采孔瓦斯压力降低速度放缓.无关键层结构时,采动影响区内抽采孔瓦斯压力降低较快. 相似文献
10.
覆岩采动裂隙椭抛带动态分布特征研究 总被引:13,自引:0,他引:13
在综放开采富含瓦斯厚煤层条件下,分析了采动后覆岩关键层活动特征对裂隙带分布形态的影响,首次提出了上覆岩层中破裂断裂和离层裂隙贯通后在空间椭抛带分布,为合理确定瓦斯抽放方法及参数提供了理论依据。 相似文献
11.
分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求. 相似文献
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《中国稀土信息(英文版)》2014,(12)
正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow. 相似文献
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《中国稀土信息(英文版)》2014,(10)
<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why 相似文献
14.
《中国稀土信息(英文版)》2014,(8)
正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets. 相似文献
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<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel 相似文献
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《中国稀土信息(英文版)》2014,(7)
正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered 相似文献
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铜熔炼中锍品位对杂质元素分配行为的影响 总被引:1,自引:0,他引:1
借助于多相、多成分系统中平衡计算的手段,开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟,分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响,并讨论其热力学分析结果对生产实践的指导意义。 相似文献
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《中国稀土信息(英文版)》2014,(11)
正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent 相似文献
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《中国稀土信息(英文版)》2014,(8)
正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of 相似文献
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《中国稀土信息(英文版)》2014,(7)
正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst, 相似文献