煤矿锚杆支护现状及发展趋势

锚杆支护是煤矿巷道的主要支护型式。回顾了锚杆支护理论和技术的历史发展进程,总结了锚固材料、锚杆施工机具和锚杆检测技术的现状,分析了煤矿锚杆支护技术的发展方向。     

煤矿巷道支护技术的研究与应用

介绍了煤矿巷道支护类型,分析了巷道支护与围岩的相互作用关系,对目前主要的巷道支护理论进行了评价。着重介绍了锚杆支护成套技术,包括地质力学测试、锚杆支护设计、支护材料、施工机具与工艺、工程质量检测及矿压监测、特殊地质条件支护技术等。通过极软岩巷道与深部沿空留巷实例分析,介绍了锚杆支护的应用效果。实践表明：锚杆支护已经成为我国煤矿巷道首选的、安全高效的主要支护方式,显著提高了巷道支护效果,保证了采煤工作面的安全、快速推进,促进了煤炭产量的大幅度增长。     

锚杆支护在煤矿掘进巷道中的应用策略

该文主要研究了煤矿掘进巷道中锚杆支护的应用方法,报告了当前锚杆支护技术的应用现状,进行煤矿掘进巷道实际施工情况调查,提出一系列相应有效的锚杆支护应用策略,得出锚杆支护技术必须不断创新和完善的结论。     

锚杆支护技术初探

近年来锚杆支护技术快速发展,在煤矿巷道围岩控制中的应用也越来越广泛,尤其是在澳、美、英等锚杆支护技术先进国家,我国也在研究推广锚杆支护技术。锚杆支护由于能主动地加固围岩,变被动支护为主动支护,有效改善了矿井的支护状况,具有施工方便、效率高,有利于加快施工进度,且施工成本低、支护效果好等特点,而成为当今巷道支护改革的主要趋势。在介绍锚杆支护原理的基础上,分析了锚杆支护的优越性,并提出应注意的事项。     

煤矿开采及深井锚杆支护技术分析

为了解决目前煤矿深部开采面临的岩体破坏大、强流变变形量大、围岩控制困难等关键技术难题,对我国目前煤矿开采进行了深入分析,进一步论述了锚杆支护及分步施工技术。结果表明：锚杆支护将是解决软岩巷道问题的主要技术之一,分步施工技术较为先进,对软岩巷道支护具有重要的指导意义。     

煤矿开采及深井锚杆支护技术分析

为了解决目前煤矿深部开采面临的岩体破坏大、强流变变形量大、围岩控制困难等关键技术难题,对我国目前煤矿开采进行了深入分析,进一步论述了锚杆支护及分步施工技术。结果表明：锚杆支护将是解决软岩巷道问题的主要技术之一,分步施工技术较为先进,对软岩巷道支护具有重要的指导意义。     

大倾角煤巷锚杆支护技术

以临涣煤矿 10 73掘进工作面巷道为例 ,介绍了大倾角煤巷锚杆支护技术的设计、应用、施工方法及巷道支护效果     

煤矿掘进巷道锚杆支护方式的应用与分析

介绍了我国煤矿掘进巷道锚杆支护技术的发展进程,例举了三种不同掘进方式巷道的锚杆支护方式,从安全、环保和高产高效的角度提出了锚杆支护技术中尚存在的问题。     

半煤岩巷道的开挖稳定性分析及支护参数评价

随着煤矿巷道中的锚杆支护技术迅速发展,锚杆的应用范围不断延伸,锚杆支护在巷道中的应用基本普及。但是,直到目前为止,锚杆支护巷道的设计及支护状况评价一直没有一种可靠的理论支撑和评价体系。文章利用数值分析的方法对南冶煤矿1201东下巷道的锚杆支护参数进行研究,发现该方法能够很好地解决巷道支护效果、预测和评价问题。     

井巷支护技术发展与现状

把井巷支护技术归纳为传统支护、金属支架支护、锚杆系列支护及复合支护技术,分析了各自的特点及适用情况。总结了我国煤矿现行巷道支护的主要经验和存在的问题,指出当前软岩巷道支护技术研究中,在理论研究、设计施工及配套设备等方面均存在一些亟待解决的问题。     

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     

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     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。