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。     

主应力对弱胶结软岩马头门围岩稳定性影响

以弱胶结围岩条件下马头门为工程背景,采用岩石力学实验、理论分析和数值模拟等技术手段,研究了主应力大小和方向对马头门顶板、底板和两帮围岩变形规律的影响及最大主应力区的分布特征。研究结果表明:随?和H的增加,马头门围岩的最大位移值和应力扰动区深度呈线性增加,围岩变形受侧压力系数影响程度表现为两帮底板顶板;马头门布置最危险的走向并非与最大水平主应力垂直,而夹角?在20°与60°时马头门顶板围岩应力集中系数最大,夹角?=0°时,马头门围岩相对最稳定,围岩变形量受夹角变化影响程度表现为顶板底板两帮;马头门围岩变形、应力分布及应力集中程度受马头门断面形状的影响显著,夹角?与应力集中系数呈非线性关系。根据研究结果对马头门的支护结构进行设计优化。     

新上海一号煤矿马头门支护方式分析

以新上海一号煤矿副井井底马头门实际工程背景,分析马头门硐室围岩受力情况及破坏原理,对硐室断面形式及支护方式进行技术分析。结果表明新上海一号煤矿副井马头门硐室采用二次复合支护,断面形状采用拱形断面、曲墙及反底拱抵抗围岩压力效果较好。     

亭南矿马头门稳定性分析

本文通过对马头门的破坏机理进行理论分析 ,采用三维弹塑性有限元方法模拟了马头门的支护 ,研究了三种支护情况下对马头门结构稳定性的影响 ,认为锚杆对围岩有不可忽视的加固作用 ,同时得出单一的刚性支护或柔性支护都不适用 ,比较理想的支护方式是先柔后刚的二次支护 ,所得结论为合理选择设计方案提供了理论依据 ,对工程的设计和施工具有一定的指导意义     

亭南矿副井马头门稳定性分析

通过对马头门的破坏机理进行理论分析，采用三维弹塑性有限元方法模拟了马头门的支护，研究了3种支护情况对马头门结构稳定性的影响，认为锚杆对围岩有不可忽视的加固作用，同时得出单一的刚性支护或单一的柔性支护都不适用于该马头门，比较理想的支护方式是先柔后刚的二次支护的结论。所得结论为合理选择设计方案提供了理论依据，对工程的设计和施工具有一定的指导意义。     

朱集西矿井副井马头门支护设计

 朱集西矿井马头门标高-962.0,深986.5m,顶板主要为细砂岩、粉砂岩,顶板主要为泥岩、粉砂岩。通过对马头门上下岩性研究,结合国内外先进成熟的支护方式,并参考周边矿井成功实例,研究并提出朱集西矿井副井马头门支护方式的优化方案。副井马头门施工完成后,围岩稳定,马头门两帮和顶底板变形移动量都非常小。有效地提高了马头门和副井井筒的整体性和承载能力,有效的控制住围岩变形,保证巷道长期稳定。     

副井马头门围岩变形监测及支护结构补强设计

马头门是矿井的咽喉部位,因其位置的特殊性,在马头门硐室开挖过程中,其受力状态十分复杂。尤其是对于千米深的立井,处于高应力下的围岩受多次施工扰动,应力集中严重,围岩应力往往会超过岩石强度,可能会引起马头门硐室围岩失稳,造成支护结构破坏,甚至危及马头门硐室处上下段井壁结构的安全。为此,开展了副井马头门围岩收敛变形监测工作,并基于围岩变形监测结果,对马头门支护结构进行了优化补强设计。     

砂岩夹薄页岩层马头门加固技术

 彭庄煤矿副井马头门在施工中发生较大变形甚至大范围冒顶,通过对马头门的破坏分析,根据已有的工程加固治理经验,结合国内外先进的支护经验,研究并提出彭庄煤矿副井马头门加固技术方案和施工方案。马头门施工完成后,围岩稳定,无明显变形,随后进行收敛变形测试,马头门两帮和顶底板总的变形量分别为4mm和5mm,有效的提高了马头门及其相连井筒、管子道支护结构的整体性和承载能力,控制住了围岩的变形,保证了巷道的长期稳定。     

副井马头门巷道围岩松动圈及支护结构内力测试技术

采用高密度电阻率法,对刘店煤矿副井马头门巷道围岩松动圈进行了监测,并对马头门支护结构内力进行了监测。结果表明,马头门巷道围岩松动圈厚度一般为2.1～3.0m,可取3.0m作为选取支护方式及支护材料的依据;马头门拱顶部位的支护结构内力较小,帮部支护结构内力较大,总体上受力状况良好,处于安全状态。     

深埋高地应力大断面破碎围岩马头门稳定性研究

针对国内某大型矿井埋深高、地应力高、断面大等特点,利用理论分析和数值计算相结合的方法分析该矿制井马头门围岩的稳定性状况,通过研究确定出了马头门附近围岩破坏区域和卸压带分布,并据此确定出了马头门附近围岩加强支护范围(即不稳定区域),建议在危险区域采用“锚+梁+网+铜带”等联合支护,并在施工时采用即使支护.     

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。