浅埋深薄基岩“三软”地层立井井壁破坏机理及防治技术研究

新矿集团伊犁一矿北工广副立井施工,出现井壁混凝土开裂、钢筋鼓出变形,部分混凝土脱落,井底马头门两侧平巷顶部浇筑体出现开裂和剥落现象,并出现大量的水沿井壁流出。对井壁及马头门连接处发生破坏的原因进行综合分析,对破坏范围内巷道围岩强度与围岩结构进行现场测试,提出"高压注浆+高预应力强力锚杆及注浆锚索"相结合的加固方法对破坏立井井壁及附近巷道进行加固,取得了显著效果。     

复杂松软岩层大断面马头门巷道破坏机理及组合支护技术研究

针对辛置矿马头门巷道断面较大，围岩应力分布复杂，易发生变形破坏的特点，根据现场实际情况，通过理论研究和数值模拟等方法分析了马头门发生破坏失稳的主要原因和锚杆索临时支护作用机理，提出采用主、被动组合支护方式对巷道全断面围岩进行加固和支护，使巷道顶板、两帮和底板加固的围岩形成整体加固拱，提高马头门围岩的承载能力。     

深井软岩马头门支护时机研究

为确定深井马头门软岩巷道围岩耦合支护时机,以冀中能源峰峰矿业集团九龙矿磁西一号井副井马头门为依托,利用数值模拟研究距迎头不同距离处巷道周边位移变化量,通过现场监测数据分析和理论分析得出二次支护的最佳支护时机。为深井软岩支护,尤其是马头门支护提供借鉴。     

深部软岩巷道“大让压-强支护”支护技术

在对某矿-900 m水平轨道大巷进行矿压观察及围岩变形监测的基础上,结合巷道弹塑性区变形力学分析,揭示了该类型巷道采用二次支护的控制机理,进一步通过数值计算得到了巷道围岩变形量与支护强度的关系。结合现场工业试验,提出了"大让压-强支护"刚柔结合支护技术:一次支护锚网索联合支护让压,二次支护全封闭金属支架+围岩壁后注浆加固。现场巷道围岩变形监测表明,该支护技术对典型深部软岩巷道变形破坏有较好的控制效果。     

高应力软岩巷道灌浆支护技术研究与应用

针对贵州某矿141712运输上山围岩大变形、锚杆索失效严重等问题,运用现场调研、理论分析、室内试验、数值模拟等研究方法分析了软岩巷道围岩变形破坏机制,提出灌浆支护技术并分析其支护原理,设计了"锚杆+锚索+灌浆+双U型钢"的联合支护方案,最后通过理论计算、数值模拟以及工业性试验对设计的控制方案进行了验证。研究结果表明:围岩强度低,自稳能力差、高应力且应力环境复杂、支护构件支护阻力低以及未对关键部位进行加强支护是造成巷道围岩变形破坏的主要原因;采用设计的支护方案后,围岩变形量减少了35%,满足现场应用要求。     

双鸭山东荣二矿动压巷道破坏分析及支护技术

东荣二矿17煤层围岩强度低,原设计支护形式不合理,在深井自重应力、构造应力及上位煤层开采引起的采动集中应力的叠加作用下,巷道围岩载荷超过其极限强度而破坏失稳。采用"锚杆+钢带+锚索+金属网+喷浆"的联合支护方案,有效控制了巷道的变形破坏,取得了良好的技术经济效果。     

深井沿空掘巷围岩变形破坏特征及控制技术研究

针对深井高应力软岩巷道变形量大、变形持续时间长、巷道难支护等问题,以口孜东矿沿空巷道为工程背景,通过现场调研、地应力测试、矿物成分分析及巷道围岩力学性能测试等手段,揭示高地压、强扰动是巷道产生大变形破坏的主要动力源,低抗载性围岩破裂加剧了巷道围岩的结构风化和强度劣化,加剧了巷道扩容变形,构成巷道产生大变形的主要内因;巷道断面不合理,支护强度低,加剧了巷道围岩扩容变形,构成巷道大变形的主要外因.从巷道破坏模式方面分析巷道5种典型变形破坏特征及发生机制;通过现场观测,揭示巷道表面变形的空间非对称性、不同深度围岩变形的跳跃性,以及巷道围岩内部结构劣化的非均匀性和跳跃性;总结了巷道大变形机理是高应力驱动下塑性区劣化后的围岩产生显著的流变与强烈的扩容变形,加速了巷道的变形失稳.提出口孜东矿沿空掘巷以"高预应力主动支护、注浆改性加固、强帮护顶"为核心的沿空掘巷支护技术,现场监测表明,该支护方案可有效控制深部高应力软岩巷道变形.     

伊犁一矿副立井马头门附近围岩加固技术

伊犁一矿副立井井底马头门底板垂深449.18m。井筒及马头门左右连接段巷道施工完成后,先后出现2次不同程度的破坏,采用高压注浆+高预应力强力锚杆及注浆锚索相结合的方法,对井底马头门附近围岩进行加固;采用钻孔窥视仪观测、注浆检查孔检查、剩余涌水量对比及矿压监测等方法,对加固效果进行综合评价。围岩加固取得了良好的效果,为新疆地区类似地层矿井建设提供了经验。     

“三软”地层井巷过渡段井壁治理技术研究

伊犁一矿副井井筒处于弱胶结“三软”地层中,井巷过渡段变形严重、持续时间长,在施工完成后出现了多次震顶和冒落现象,严重威胁矿井生产安全。针对这一问题,根据矿井井筒穿越薄基岩松软破碎岩层的地质条件,并考虑到矿井后期井底马头门附近井巷工程开挖对现有井巷围岩的扰动影响,提出了围岩注浆加固和强力锚杆锚索支护系统相结合的加固治理方案。治理工程结束后,在两侧加固段围岩进行钻孔观测,发现围岩裂隙在浆液作用下充填效果较好,围岩钻孔内部出水得到有效控制,成功地解决了“三软”地层井筒马头门及附近井巷工程的变形破坏难题。     

大直径高预应力强力锚索在巷道加固中的应用

为了解决某矿副井马头门反复变形破坏的问题,结合马头门工程地质资料以及变形返修情况对马头门变形破坏的机理进行了分析,得出马头门变形破坏的根本原因是原有支护阻力低的结论。利用定向钻孔技术,将马头门与泵房和变电所打通,施工大直径预应力注浆锚索束186个,极大提高了马头门与泵房、变电所之间岩柱的围压。经过45 d的不间断观测,巷道变形趋于稳定,两帮移近量为30 mm,顶板下沉量8 mm,底鼓量12 mm,加固效果良好并最终解决了马头门的变形破坏问题。实践证明：大直径高预紧力强力锚索能提供强大的支护阻力,能较为有效地提高围岩围压,保持巷道稳定。     

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.