综采工作面锚杆支护巷道围岩变形量分析与控制

煤巷锚杆支护是采用锚杆支护设计软件设计的,而巷道掘进过程中选择的锚杆支护参数没有有效控制孤岛工作面回采过程中的巷道变形。通过对工作面回采过程中巷道围岩表面位移监测结果的分析,合理选择了控制巷道围岩变形加固支护参数,有效控制了巷道的围岩变形,确保了安全生产。     

三软回采巷道锚杆支护技术研究

随着开采深度的增加,三软煤巷是围岩剧烈变形的难维护的回采巷道.通过对锚杆对软岩巷道围岩的支护分析,提出加固帮角控制围岩稳定、高阻让压支护限制围岩变形和强化顶板保证安全的主动支护的思想,研究了合理的锚杆支护技术.     

特殊条件下煤巷锚杆支护的实践

本文介绍了祁南煤矿在特殊条件下进行的煤巷锚杆支护方法，总结了祁南煤矿煤巷锚杆支护配合注浆和锚索加固的成功经验，为综采切眼、沿空掘巷、三岔门、四岔门和断层带支护提供一种有效的方法，扩大煤巷锚杆支护的应用范围。     

临空煤巷锚杆支护的位移特点及分析

根据万年矿临采空区煤巷锚杆支护试验观测结果。分析了煤巷围岩的变形规律，并关重探讨了临宁煤帮的变形特点，阐述了临空帮锚杆在不同时期的主要作用，提出了此类巷道锚杆支护参数设计的要求。     

深部煤巷支护形式及围岩移近量研究

通过对新汶矿区深部煤巷两种支护形式围岩变形量的调查和对锚杆支护方式围岩变形量概率统计分布的研究，分析了不同条件下两种支护方式的适用性、得出了锚杆支护方式下的围岩变形规律。对新汶矿区深部煤巷支护形式的和支护参数的选择具有一定的指导意义。     

煤巷锚杆支护数值模拟研究

采用数值模拟方法对煤巷锚杆支护进行分析研究,获得煤巷锚杆支护围岩应力分布规律及矿压显现规律,验证了支护的合理性,为优化煤巷锚杆支护参数,控制围岩变形提供了理论依据。     

煤巷锚杆支护数值模拟研究

采用数值模拟方法对煤巷锚杆支护进行分析研究,获得煤巷锚杆支护围岩应力分布规律及矿压显现规律,验证了支护的合理性,为优化煤巷锚杆支护参数,控制围岩变形提供了理论依据.     

临空回采巷道锚杆支护围岩位移分析

根据万年矿临采空区锚杆支护煤巷位移观测结果，分析了煤巷围岩的变形规律，并着重探讨了临空帮的变形特点，讨论了临空帮锚杆设计原则。     

层状顶板煤巷锚杆预紧力的作用分析

采用有限元模型分析方法,对层状顶板煤巷预应力锚杆支护顶板离层进行了数值模拟,分析了无支护和预应力锚杆支护下围岩的应力和变形情况。结果表明,预应力锚杆支护可以显著提高围岩的稳定性,有效地控制煤巷顶板变形。     

中等稳定顶板条件下的锚杆支护技术

本文介绍了开滦矿务局唐山煤矿中等稳定顶板条件下煤巷锚杆支护技术使用的经验。分析了大断面巷道中应用锚索补强加固的作用机理，提出了不同支护条件下巷道的变形规律，评价了该技术应用的技术经济效益。     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

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     

2014 second batch of rare earth quota released

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Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

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.     

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.