深井高地压软岩应力集中区巷道锚注组合支护技术

针对深部复杂地质条件下采动动压影响区内的矿井、采区主要巷道,采用高预应力锚杆、锚索和注浆联合加固支护技术,可实现有效控制围岩变形与破坏,避免巷道多次维修。并通过高压注浆技术实现锚杆、锚索全长锚固支护和对松散破碎岩体的充填、固化和加固,能更好地发挥岩层与锚杆杆体共同抗剪切作用,抑制围岩离层与错动,充分发挥锚固岩体的自承、自稳能力。解决深井高地压复杂地质条件下采动动压影响区内的主要巷道支护技术难题,从支护效果、支护成本、安全可靠等方面为矿井实现高产高效创造了前提条件。     

深井高地压软岩新型树脂锚固剂全长锚固支护技术

煤矿锚杆支护技术是煤炭开采的一项关键技术。随着矿井产量和效率不断提高,淮南矿区锚杆支护率已达到90%以上。针对淮南矿区深部复杂地质条件,采用高预应力、强力锚杆支护及锚杆和锚索联合支护技术,从顶板比较稳定的煤巷,到复合、破碎的顶板巷道;从实体煤巷,到高应力、高地压的沿空掘巷,到稳定及松软的岩巷等,实现一次支护有效控制围岩变形与破坏,避免巷道多次维修。特别是锚杆全长锚固支护技术成功应用,解决了软岩、松散破碎巷道的支护技术问题,能更好地发挥岩层与锚杆杆体共同抗剪切作用,抑制围岩离层与错动,充分发挥锚固岩体的自承能力。初步解决了深井高地压复杂地质条件下的巷道快速掘进、快速支护技术难题,为矿井、工作面实现高产高效创造了条件。     

高应力区大断面硐室维修加固支护技术

处于高应力区、采动影响、围岩软弱环境中的大断面硐室破坏现象严重,影响了矿井安全高效开采。以恒源煤矿Ⅱ62采区轨道下山绞车房为研究对象,通过钻孔窥视,探查巷道围岩破坏情况,给支护方案提供了依据。采用顶板组合式拉力分散型树脂与注浆全长锚固锚索支护+直墙岩体破碎段钢筋混凝土墙置换+锚索支护的综合支护技术,矿压观测结果表明,该支护方案能够有效控制高应力区大断面修复硐室的围岩变形;提出并实施的"新型组合式拉力分散型树脂与注浆全长锚固锚索"支护技术,能够实现普通锚索支护的高强度与注浆加固的联合支护,对提高巷道或硐室长期支护安全具有重要意义。     

复杂地质构造区域软岩层巷道围岩控制技术研究与应用

以软岩层矿井复杂地质构造区域巷道掘进与围岩控制为工程背景,在对巷道围岩应力环境、岩体强度、围岩内部裂隙发育状况详细测定和围岩可锚性试验的基础上,提出"强力锚杆初始支护+破碎围岩注浆加固+高预应力锚索加强支护"的巷道围岩控制技术。实践表明,强力锚杆支护系统与破碎围岩注浆加固相结合的围岩控制方式,是解决复杂地质构造区域软岩层巷道围岩控制难题的有效途径。     

破碎巷道围岩变形机理及支护措施研究

注浆加固+锚索支护方式使破碎围岩巷道形成一个整体,能更好地控制围岩变形破坏。本文针对木瓜煤矿10-208回采巷道施工期间因巷道围岩破碎、地质条件复杂等因素影响,围岩出现变形大、难支护等问题,采用理论分析与现场实践相结合的方法,对破碎围岩巷道支护措施进行了研究,提出了“注浆加固+锚杆索”支护技术。现场实践结果得出巷道过围岩破碎段掘进期间,顶底板及两帮累计变形量最大值分别为54.5mm和64.6mm,表明“注浆加固+锚杆索”支护技术可对破碎围岩巷道变形破坏进行有效控制。     

近断层采动巷道变形破坏机制与控制技术研究

针对红岭煤矿近断层采动巷道(15141上巷)掘进期间围岩非对称变形破坏与支护结构失效严重等现象,对其变形破坏机制与控制技术进行了数值模拟与工程应用研究。结果表明,断层附近的非对称采动应力场、巷道关键部位的剪切滑移破坏以及煤岩体碎胀变形是造成该类巷道非对称大变形和支护失效的主要原因。利用非对称耦合支护原理和让压锚杆工作原理,提出了该类巷道围岩控制技术,即采用高强让压锚杆、锚索以及注浆加固对关键部位进行加强支护,控制关键部位的剪切滑移破坏、提高其承载能力,减弱围岩关键部位产生的差异性变形,促使支护结构均匀承载,从而实现控制巷道非对称大变形的目的。工程实践表明:采用高强让压锚杆、锚索与注浆加固的非对称支护技术后,巷道变形量与非对称性得到有效控制,巷道围岩稳定性大幅提高。     

基于预应力锚和自应力注的破碎围岩锚注加固应用研究

针对高应力巷道围岩锚注中注浆锚杆锚固力低和水泥基注浆材料自收缩造成控制效果不佳的问题,提出基于预应力锚和自应力注的破碎围岩锚注加固方法.以平煤十矿变电所巷道为工程背景,基于原支护方式失稳机理分析,探究裂隙岩体自应力浆液加固原理,研发新型高强预应力注浆锚杆系统,形成基于预应力锚和自应力注的破碎围岩锚注支护方案.通过浆岩界面SEM扫描、围岩钻孔窥视、锚杆索受力和围岩变形监测等方法综合评价该新型预应力锚注的工程应用效果.结果表明:通过高强预应力注浆锚杆的轴向约束应力与自应力浆液的膨胀应力使加固围岩处于准三维受力状态,实现了破碎围岩的强化与损伤修复;新型高强预应力注浆锚杆具有预应力大、预应力施加标准、锚固力高、杆体强度高等优点,能够对围岩提供高轴向约束;新型锚注加固后,注浆浆脉充填围岩裂隙,浆液结石体与岩体结合致密;注浆锚杆索受力稳定,巷道表面围岩最大位移为83 mm,说明通过新型预应力锚注加固方案实现了变电所巷道围岩稳定性控制.     

高强中空锚杆/索结构及全锚注技术研究

针对高应力、软岩、动压、裂隙节理破碎岩体及其复合型困难条件巷道围岩非连续、非协调大变形控制难题,提出了复杂困难条件巷道高强全锚注一体化控制理念,通过采用高强中空注浆锚杆、中空注浆锚索及高强护表构件全锚注支护,实现了锚杆索锚注一体化、全长锚固及围岩自承能力提质增强,最终形成巷道围岩"协同强力护表、叠加内拱、深外拱"多层次、梯次强化支承结构;试验表明:高强全锚注支护系统刚度提高5.8倍,抗剪强度提高0.5～0.8倍,在全国多个矿区沿空掘巷、高应力软岩煤巷等各种类型巷道应用效果良好,围岩变形破坏得到有效控制,提高了破碎煤岩体锚杆锚固力及锚固安全性与可靠性。     

让均压锚网支护系统在高应力区的研究与应用

该文介绍了在矿井煤巷高应力条件下优化支护系统,采用高预应力可变形锚杆让压均压支护理念,优化让压均压支护系统,采用锚杆与锚索的协调变形设计技术实现高应力条件下锚杆、锚索不破断,有效控制巷道围岩变形等问题,提高支护质量的研究与实践。     

动压巷道锚注加固技术应用研究

以某矿石门巷道受上部煤层工作面跨采影响条件下的维护技术为例,对巷道破坏的原因进行了分析,从提高围岩强度的角度出发,提出了在原支护条件下对被保护巷道进行注浆加固的方案。从现场实践的效果来看,注浆技术的采用提高了浅部岩体的围岩强度,改善了力学性能,从而使巷道在采用锚杆支护时,能够显著提高锚杆的锚固力,形成有效的承载结构,降低采动影响围岩变形的程度。     

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     

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     

2014 second batch of rare earth quota released

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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