薄煤层回采巷道差异化围岩控制技术研究

赵家寨煤矿31118工作面下副巷为薄煤层回采巷道,为保证巷道支护效果,确定了3种差异化支护方案,分别从数值模拟以及现场工业性两个方面进行对比,结果表明:棚索耦合支护能够有效地控制巷道围岩变形,巷道支护效果良好。     

棚索协同支护锚索间距理论研究与应用

为了确定U型钢支架和锚索协同支护系统中锚索的合理间距,分别建立了U型钢支架以及U型钢支架和锚索协同支护的力学模型,采用力法原理对力学模型进行分析,确定了棚索协同支护系统中锚索的间距。计算结果表明:棚索协同支护锚索的间距与侧压力系数、巷道的断面尺寸和埋深有关。建立了松散煤体侧压力系数的解析表达式,对U型钢支架和锚索协同支护进行数值模拟。模拟结果表明:棚索协同支护系统中锚索的合理间距显著地减小了巷道围岩的变形量、塑性区的面积以及U型钢支架的最大弯矩,实现了U型棚与围岩之间以及锚索与深部围岩之间的耦合支护。实践表明:采用锚索和工字钢对U型钢支架的各关键部位进行加固,能够有效地控制巷道围岩的稳定性,保证煤矿的安全生产。     

煤柱底板巷道围岩控制技术研究

许疃煤矿82联巷原有支护方式为36U型钢支架喷浆支护,受巷道上方煤柱上高支承压力的影响,巷道变形强烈。根据巷道现有变形破坏特征,分析了其破坏内在原因,采用FLAC2D6.0软件对不同的支护方案进行数值模拟对比分析。结果表明,棚索协同支护+全断面注浆加固+底板高强锚网索支护,有效改善了巷道浅部围岩结构,现场工业性试验结果表明,巷道围岩变形量小,围岩变形得到有效控制。     

平煤十二矿31030工作面进风巷破碎围岩控制技术

为保障31030工作面进风巷围岩的稳定,根据其与上覆己15煤层采空区间的赋存关系可知巷道围岩较为破碎,通过具体分析破碎围岩支护原则,确定巷道采用棚索耦合支护,支护方案实施时主要采用支架搭接强化技术、支架间围岩强化技术和U型钢-锚索协同支护技术,结合巷道围岩的具体特征,进行棚索协同支护方案的设计,并在支护方案实施后进行巷道表面位移情况的观测分析。结果表明:31030工作面进风巷在该种支护方案下,掘进期间顶底板及两帮最大变形量分别220mm和149mm,保障了巷道破碎围岩的稳定。     

动压巷道棚索协调支护技术应用实践

针对普通U型钢支护存在支架强度低、支护围岩相互作用关系差以及不能适应动压巷道复杂应力环境和大变形的现状,提出了以高阻可缩重型U型钢和高强度锚索为主的棚索协调支护技术,具体包括壁后充填注浆改善支护围岩相互关系,薄弱区锚索补强提高支护结构整体稳定性以及锚注加固底板控制底鼓。结合某矿巷道具体地质条件,通过数值模拟研究了不同支护方案对动压巷道围岩变形的控制效果。观测结果表明：顶底板移近量约280 mm,两帮移近量约为260 mm,采用棚索协调支护技术能有效控制巷道围岩变形。     

锚索在煤巷中的支护作用分析及应用

通过对锚索在棚索耦合支护中作用的数值模拟分析,得出当围岩变形量较小时,锚索的主要作用是改善支架与围岩的相互作用关系,当围岩变形强烈时,锚索的作用是给支架支护结构的薄弱处提供结构补偿力,说明了锚索的支护作用不能简单的以锚索的支护力来衡量,经过现场试验证明了锚索耦合支护在厚煤层巷道中有效。     

滑动构造区“三软”煤巷棚杆索协同支护技术研究

针对滑动构造影响下三软煤巷支护技术难题,选取告成煤矿21051运输巷作为研究对象。采用理论分析、数值模拟、现场实测等研究手段,分析该类巷道采用U形钢棚支护失稳原因,提出棚-杆-索协同支护技术控制该类巷道围岩强烈变形,并进行了现场工业性试验,取得了良好的支护效果。     

三软煤层孤岛工作面沿空巷道围岩控制技术研究

某矿21101工作面沿空掘巷机巷原采取4 m窄煤柱护巷,36U型钢支架支护,巷道掘出不久即严重变形。基于沿空掘巷上覆岩体大小结构模型分析了沿空巷道围岩控制原理,理论计算结合数值模拟分析确定了煤柱留设宽度为6 m,对新型棚-索协同支护效果进行了对比分析,结果表明留设合理尺寸的窄煤柱,采用棚-索协同支护,能较好控制三软煤层工作面沿空巷道的强烈变形。     

近距离跨采巷道围岩控制技术研究

某矿Ⅱ4采区主采8煤和10煤,该采区准备巷道布置在10煤底板岩层中,底板巷道在同一区段需经受至少2次工作面跨采影响,巷道变形极为强烈。分析了现有支护方式及巷道变形破坏的原因,数值模拟结果表明:采用小孔径预应力锚索进行结构补偿,在围岩浅部形成稳定的共同承载体,能够有效的控制巷道变形。现场工业性试验结果表明:实行棚索耦合+底板锚网索支护后,巷道围岩变形得到有效控制,支护效果良好。     

三软不稳定煤巷支护技术研究

某矿31041工作面上、下付巷为三软不稳定煤巷,原支护采取36U型钢支架支护,巷道变形严重。通过数值模拟分析了煤层厚度及倾角对巷道围岩稳定性的影响,针对性的采取棚索协同支护后,支护效果良好,围岩变形得到有效控制。     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<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     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

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.     

Rare Earth Application in Steel in China

<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     

China rare earth market review

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.     

稀散金属产业的观察与思考

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.     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Brief news

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     

铜熔炼中锍品位对杂质元素分配行为的影响

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。     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new