尾矿库在线监测系统浸润线预警阈值计算方法研究

尾矿库堆积坝浸润线的埋深与坝坡安全直接相关,对照《尾矿设施设计规范》GB50863-2013中有关控制浸润线的要求,整理了浸润线预警阈值的计算方法和逻辑控制关系,并结合实际工程,建立了浸润线计算模型,研究了浸润线最小埋深与稳定性、渗流边界等的关系,为尾矿库在线监测系统浸润线预警阈值的设置提供了依据。     

尾矿坝汛期坝体浸润线监测预警值研究

鉴于当前尾矿库在线监测系统中关于浸润线埋深预警值的选定上存在困难,本文在已有研究基础上,结合浸润线在线监测系统,从坝体稳定性角度,分析研究了尾矿坝坝体浸润线监测的预警值,提出了汛期尾矿库坝体最不利浸润线的确定方法,将预警参数分为企业、县安监局、市安监局三级预警,并针对不同工况确定三级预警参数,此研究成果可为在线安全监测系统的预警提供技术支持。     

富贵鸟1号尾矿库坝体稳定性数值模拟

基于富贵鸟1号尾矿库现有岩土工程地质条件,采用有限元法对该尾矿坝进行渗流稳定性及静力有限元数值模拟分析.结果表明坝体在正常运行工况以及洪水运行工况下,尾矿堆积坝坝坡浸润线埋深满足规范规定.坝体浸润线沿初期坝坝坡出逸,系透水堆石坝正常排水现象,不会对坝坡产生如管涌、流沙和表面沼泽化等渗流破坏.并在此基础上,采用毕肖普法和瑞典圆弧法对坝体进行正常水位工况、洪水位工况和洪水位及地震作用工况下的稳定性计算,得到尾矿坝坝体内部应力应变关系,以及坝体最小稳定性系数.结果表明坝体的稳定性系数大于规范要求的最细小安全系数,坝体是安全稳固的.     

鑫洲铁矿尾矿坝稳定性分析

对中国黄金集团迁西鑫峪矿业鑫洲铁选场尾矿库进行了系统的稳定性评价,采用数值方法对渗流安全性能和坝体稳定性进行计算,结果表明:尾矿库浸润线最小埋深大于规程要求的深度,满足规程规定。初期坝体、终期坝体及副坝在各种工况条件下安全系数均高于规定要求,计算得出的抗滑稳定系数大于允许最小安全系数,能保证尾矿坝的稳定运行。     

基于Geo-studio的尾矿库加高扩容后坝体稳定性分析

加高已有尾矿坝是扩大尾矿库库容的一种经济可行的办法,但尾矿库等级升高,溃坝风险增大。以辽宁某尾矿库为例,通过现场勘查和室内试验获得堆积层基本物理力学参数;对比实测浸润线,利用Geo-studio软件模拟分析尾矿坝加高前后渗流场并优化渗透系数,进一步分析坝体静力稳定性和地震动力响应。结果表明：尾矿库浸润线最小埋深在10 m以上,符合规程要求;采用瑞典圆弧法和简化Bishop法计算的安全系数均高于允许最小安全系数,地震对坝体安全性影响较小,只有局部液化;加高后最危险滑面位于初期坝附近370 m标高以下,主要为深层圆弧形滑移,原因是尾粉土渗透性较低导致浸润线升高,建议实时监测尤其是洪水期浸润线高度,必要时采取相应措施降低浸润线,有效杜绝渗透破坏。     

学峰尾矿库坝体稳定性研究

坝体边坡稳定性是尾矿库安全的重要因素。在坝体稳定性研究中,首先须考虑地下水渗流的作用,明确尾矿坝浸润线埋深特点;后根据勘察资料,进行稳定性计算,以验证坝体稳定性安全系数的规范符合性。研究结果表明:在排渗结构功能正常的工况下,坝体无论在正常运行、洪水运行和特殊运行条件下,坝体抗滑稳定安全系数都能满足规范要求。     

尾矿坝稳定性的不确定性概率推理分析和试验研究

为了合理分析尾矿材料固有属性不确定性对尾矿坝稳定性的影响,通过分析影响尾矿坝稳定性各因素的不确定性,将定值计算与随机抽样相结合,建立尾矿坝稳定性分析的不确定性推理模型。模型采用贝叶斯网络结构表示尾矿坝稳定性与各影响因素之间的定性关系、网络参数(条件概率)定量表示各因素对尾矿坝稳定性影响的不确定性,并借用双向推理分析多因素变化对尾矿坝稳定性的影响。借助实例,验算了安全系数与级配参数之间的变化关系,并应用后验概率计算分析得出尾矿坝失稳变化的安全主控因素是黏聚力和内摩擦角,提出通过排渗增大安全主控因素以提高坝体稳定性的措施并应用于现场实际。数值模拟和现场试验结果证明将不确定性概率推理应用于尾矿坝稳定性分析及提出的措施是合理的。     

基于渗流计算的尾矿坝静力稳定性分析

尾矿库改变放矿模式后,库区前缘干滩强度增强,但积水量增加,对坝体的渗流和静力稳定性产生了影响。对尾矿坝二级子坝和最终坝高断面进行渗流和静力稳定性计算,计算结果表明:坝体浸润线埋深较浅,坝体自由面较高,水力坡降最大值位于初期坝坡脚处,水从初期坝坝面溢出,可能发生流土或管涌;坝体水平位移小,最小主应力只在二级子坝局部位置为拉应力,对坝体稳定性影响不大;二级子坝静力稳定性安全系数比允许最小值略小,最终坝高坝体稳定性较强。坝体总体稳定性较强,建议采取坝体深部排水措施(如水平排水管、辐射井等),降低坝体的自由面,提高坝体稳定性。对二级子坝做好护坡,并采取相应措施增加库区浸润线埋深,保证坝体稳定运行。     

矿山废石对尾矿坝浸润线的影响机理研究

浸润线是衡量尾矿坝稳定性的关键指标,研究浸润线埋深变化对于提高尾矿坝的稳定性有重要意义。以斋家冲尾矿坝为工程背景,利用矿山废石与尾矿砂联合堆筑的方法建立了与原型相似的含废石柱尾矿坝的试验模型,分析废石柱的颗粒级配和间距对尾矿坝不同工况下的坝体单位时间渗流量和浸润线埋深的影响,并利用Geo-studio软件中SEEP/W研究了正常工况下的坝体渗流流态。结果表明:随着废石柱细颗粒含量的降低,坝体单位时间渗流量增加,浸润线埋深则降低;随着废石柱间距的增大,尾矿坝的单位时间渗流量减小,初期坝坝前坡脚处截面流量增大,孔隙水压力线与坝基的水平夹角减小,浸润线埋深随之抬高。研究结果可为类似尾矿坝的设计与施工提供参考,有利于减少废石对生态环境的影响。     

尾矿坝浸润线预警研究

运用Geo-Studio软件,对某尾矿库不同水位工况下尾矿坝的浸润线及安全稳定性系数进行计算。根据计算出的结果,并结合《尾矿库安全技术规程》中的相关规定,对尾矿坝浸润线进行预警,得到该尾矿坝浸润线的三级预警值,为尾矿坝浸润线的预警提供理论依据,具有重要的借鉴意义。     

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