MD-50型锚杆钻机在链子崖危岩体防治工程中的应用

１钻机“登上”链子崖链子崖概况见本期“长江三峡链子崖危岩体防治工程中的锚固钻孔工艺”一文。根据长江三峡链子崖危岩体防治工程施工设计，防治的主要措施是用预应力锚索锚固，１８３根锚索均布在危岩体北侧的陡壁上，单根锚拉力分别为１０００、２０００、３０００ｋ...     

长江三峡链子崖危岩体产生的机理及工程治理

由于煤炭开采引起的地质灾害在我国并不鲜见,长江三峡链子崖危岩体的产生就是其中的一例,但现有的技术手段完全可以控制地质灾害的产生。通过简述长江三峡链子崖危岩体产生的原因、危岩体移动变形情况,在对危岩体变形破坏机制的计算分析的基础上,提出了治理煤层采空区承重阻滑防治方案,工程方案实施验收后5年的观测证明,危岩体移动、变形得到了控制,危岩体的整体稳定性大大增强。     

崩塌冲击斜坡滑移联合运动分析

本文提出一种崩塌冲击斜坡滑移联合运动分析方法,并就长江三峡链子崖危岩体崩塌冲击猴子岭斜坡体所导致的联合运动问题进行了详细案例研究,所得结果比较符合实际。     

长江三峡链子崖危岩体防治工程中的锚固钻孔工艺

介绍了长江三峡链子崖危岩体的概况以及整治危岩体中造锚索孔的技术，包括钻机在高空排架固定、防止孔斜及测斜、破碎带和大裂缝的钻进技术，以及大裂缝的堵漏技术。     

长江三峡链子崖危岩治理创奇迹

我国第一重大边坡治理工程──长江三峡链子崖危岩治理工程已近尾声。威胁最大的5万m3危崖体已被154根预应力锚索牢牢地锁在固定崖体上，从而创造了国内超高超险预应力锚固施工、国内穿过溶洞和裂缝锚索施工、国内乃至国外超长大吨位锚索施工的3大奇迹。长江三峡链子崖危岩体位于湖北省科归县长江南岸，变形危岩体总体积达330万m’，形成高约100余米的悬崖陡壁的软弱基座。由于长期采煤，山体下部形成大面积采空区。其岩体在多种因素作用下，形成了长和深均达数十米至数百米、宽l～6rn不等的裂缝。这些危岩体如不及时整治，将在地震、暴雨等…     

显式拉格朗日差分法在链子崖危岩体锚固工程中的应用

显式拉格朗日差分法是相对于隐式差分法的一种新型数值分析方法。简要介绍了这种方法的基本原理，并将基于该方法开发的ＦＬＡＣ程序应用于链子崖危岩体的锚固工程中，对锚固前后危岩体的状态进行了对比。最后总结了使用ＦＬＡＣ程序的一些经验和体会。     

AR（n）模型在滑坡变形分析中的应用

本文详细讨论了AR(n)模型在变形分析中的应用方法,最后运用链子崖危岩体G、F两点的垂直变形观测资料,证明了该方法的有效性,并得出了一些有益的结论.     

基于粒子轨迹的危岩体损伤识别研究

危岩体损伤早期识别是边坡地质灾害防治的重点。 针对传统监测方法准确性低、敏感性差的问题,提 出用于评价危岩体损伤前后运动形式变化的指标———粒子轨迹。 通过分析危岩体运动学机理,推导危岩体粒子轨迹 与主控结构面粘结面积相关性。 引入互相关近似熵概念并拓展至三维,用于评价危岩体损伤前后粒子轨迹差异程 度,实现对粒子轨迹的定量分析。 开展模型试验,监测危岩体不同后缘裂缝深度下的自由振动响应,利用三维互相关 近似熵分析粒子轨迹差异性。 试验结果表明,随岩桥损伤程度加强,粒子轨迹熵值逐渐增大。 相比传统监测方法,粒 子轨迹对危岩体结构面损伤更敏感且普适性强,为危岩体损伤识别及崩塌早期预警提供了新的研究思路。     

水文地质调查在危岩体治理中的应用实践分析

危岩是发育在陡峭山区的地质致灾隐患之一。多个不利结构面形成的危险楔形体是危岩体常见的形式。地下水在一定程度上能够弱化结构面的粘接性,结合水文地质调查对危岩体的治理有重要意义。结合工程勘察实例,分析水文地质环境在危岩体的形成、发育过程中的作用,并对治理方案进行探讨。     

连霍高速K4189+500段东侧崩滑体稳定性分析

阐述了崩滑体特征及地质环境条件,对崩滑体变形情况及稳定性进行了分析,分析表明崩滑体处于临界状态。稳定性分析认为锁固段支撑了1#强变形区,崩滑体暂未形成贯通的破坏面,崩滑体未出现整体破坏,但崩滑体处于不稳定状态。在保证连霍高速及周边安全的前提下,设计了快速消危措施,通过对锁固段爆破,起动崩滑体,消除了崩滑体的影响。     

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