深部硐室群破坏机理及其稳定性控制

煤矿开采进入深部以后,地质力学环境远比浅部复杂,由此引起的非线性力学现象日益严重,给深部硐室群工程稳定性控制带来很大难度.通过现场调查、室内试验和数值模拟等手段分析深部硐室群破坏机理,得出高地应力、膨胀型粘土矿物、工程偏应力集中及开挖顺序不合理是深部硐室群变形破坏的主要原因.并利用集约化设计优化硐室结构,消除硐室空间效应,降低工程偏应力对稳定性的影响.通过数值模拟得到最优施工顺序,选择最优应力路径,降低硐室开挖彼此间的扰动影响.针对高地应力和高膨胀力,采用锚网索加立体桁架耦合支护技术控制围岩稳定性.该研究可为煤矿深部硐室群工程稳定控制提供借鉴.     

深部泵房吸水井硐室群围岩稳定性一体化控制技术

泵房吸水井硐室群是矿井巷道立体交叉最密集、应力最集中、最容易破坏的部位,其围岩稳定性控制效果直接影响着矿井安全生产。为解决孔庄煤矿-1015m水平深部泵房吸水井硐室群围岩稳定性控制问题,从工程地质条件分析出发,针对"三高一扰动"强烈、膨胀性软岩矿物含量高(伊/蒙混层的总量最大值达89%)、工程施工极其复杂等不利条件,通过集约化设计消除立体交叉巷道硐室群的空间效应,利用数值模拟手段确定最优施工过程,采用桁架+锚网索耦合支护技术实现围岩荷载均匀化。结果表明:深部泵房硐室群稳定性一体化控制技术能够有效地控制围岩变形和破坏,保证巷道长期稳定,具有广阔的推广应用前景。     

深部软岩泵房硐室群集约化设计技术

为了研究深部软岩泵房硐室群空间布置对稳定性的影响,分析了采用常规设计的深部泵房硐室群系统变形破坏特点和原因,提出了深部软岩泵房硐室群集约化设计技术,分析了设计原理和特点,给出了组合吸水并的等效计算公式和硐室群最佳施工过程.结果表明:深部软岩泵房硐室群采用集约化设计减少了吸水井个数、减少或取消了配水巷,提高了整体稳定性,将研究成果应用于我国最深的第三系软岩矿井一柳海矿,效果良好.     

深部泵房硐室群破坏原因及控制对策研究

随着开采深度的不断增加,深部泵房硐室群的支护问题变得越来越严重,采用传统的硐室群布置方式和支护方法已经难以保证在服务年限内安全使用,深入研究深部泵房硐室群稳定性控制对策势在必行。通过现场工程地质条件调查和理论分析,研究了夹河煤矿深部泵房硐室群破坏特征,总结了破坏原因,提出了该矿深部泵房硐室群集约化设计方案及配套支护技术,现场应用效果良好。     

深部硐室围岩破坏原因与稳定性控制技术

煤矿开采逐渐转向深部,深部硐室围岩大变形特征给硐室群稳定性控制带来很大难度。根据深部大断面硐室围岩力学特征及变形特性,通过地质条件分析、原岩应力测试、岩石微观组分分析,对深部硐室围岩破坏的影响因素进行了总结,以抗让结合的原则,提出深部构造复杂区域大断面硐室围岩稳定性控制对策。采用关键部位耦合支护控制技术+底脚锚杆+全断面锚索加强支护对深部大断面硐室进行强抗微让的强力支护方式,在葛亭煤矿230扩容泵房硐室成功应用,并对泵房硐室围岩收敛变形、锚杆索工况、离层进行了长期监测,围岩顶底板移近量仅12.5 mm,两帮内移量7.5 mm,锚杆索受力均匀,内外离层较小,完全满足矿井安全生产需要。     

深井高应力强膨胀软岩泵房硐室群稳定性控制对策

针对传统布置形式下泵房硐室群各关键部位的破坏,对其原因及主控因素进行分析,并提出相应的稳定性控制对策。结果表明:布置形式、埋深大、地应力高、特别是高的水平构造应力以及围岩黏土矿物含量高是传统布置形式下硐室群出现大变形破坏的主控因素;采用泵房硐室群集约化设计技术,结合锚网索+桁架+底角注浆锚管的耦合支护技术的综合应用,有效削减了硐室围岩的应力集中程度,提高了整体稳定性,有效控制了硐室群围岩稳定性。上述技术在孔庄矿-1020水平泵房硐室群支护工程中进行了现场应用,监测数据显示,控制效果良好。     

吉宁矿采区水泵房与水仓优化设计

根据吉宁矿矿井设计巷道的布置特点,以节省投资、缩短工期、减少建设工程量为原则,优化布置了采区水泵房与水仓系统。在充分发挥泵房作用的同时,潜水泵房合并了水泵房硐室的配水巷、吸水井、配水井等硐室,简化设置泵房硐室,减少了泵房硐室的密集布置,并避免了巷道间工程应力的相互干扰,实现了水泵房硐室稳定性整体提高,减少了水泵房施工工程量,节约了矿建投资。     

深部矿井泵房硐室变形破坏原因及稳定控制方法

 硐室群稳定性是困扰深部开采的重大问题之一,本文以多个典型深部矿井为实例,在现场地质调查、地应力测试、围岩物理力学特性试验、数值模拟等基础上,揭示了影响深部矿井硐室群稳定性的四个关键因素 ：高复合应力、膨胀性矿物、开挖扰动、支护不合理,并分析了各因素对稳定性影响的作用机理。然后运用软岩非线性大变形力学设计方法提出了相应的控制对策及设计研究方法。最后针对传统硐室群的设计弊端,利用力学优化原理,提出深部硐室群优化设计方法及配套稳定性控制技术,并将研究结果应用于徐州矿区埋深1043m的旗山矿泵房变电所硐室群稳定性控制工程中,通过围岩变形监测显示：该系列技术可以有效控制深部软岩矿井硐室群的稳定性,使用效果良好,具有重要的工业应用价值和良好的推广前景。     

深部高应力硐室群围岩应力分布及破坏特征模拟研究

以潞安集团李村煤矿为研究背景,在地质力学测试的基础上,采用FLAC~(3D)软件对深部高应力条件下硐室群的开挖进行数值模拟研究,分析围岩应力分布和破坏特征。结果表明:硐室群的开挖及相互扰动引起围岩应力集中和变形破坏,最终使得围岩局部失稳,处于亚稳定状态;煤岩体强度提高后,开挖造成的应力集中范围缩小,有效减弱各硐室之间的相互扰动,有利于维护硐室群的稳定性。现场试验表明采用合理的支护及加固技术能有效解决围岩变形控制的难题。     

深井大断面分层施工联合支护技术

介绍了潘西矿深部大断面泵房硐室的分层施工、联合支护技术工程实践和设计思路。该项工程实现了大断面硐室安全、快速施工,保证了支护质量,降低了综合施工成本,成功地解决了矿井深部大断面硐室的施工、支护技术难题。     

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。