浅析半煤岩巷道支护施工工艺控制

半煤岩巷道支护施工在具体作业过程中面临的难度较大,在施工过程中,要对采用的施工工艺进行深入探讨,确保工程最终施工的合理性和顺利进行。通过对下峪口煤矿23210工作面工程的具体情况进行探讨,在掌握煤(岩)层赋存特征的基础上,从临时支护、永久支护、复合顶板支护3方面开展了支护设计,并从锚杆长度、间距等方面进行了巷道顶板支护验算,最后对临时支护的支设方法、锚杆施工方法、锚索施工方法展开深入探讨。分析认为,采用该事故工艺控制方法,可确保工程最终施工工艺的合理性,满足矿井安全生产的需要。     

岩土工程深基坑支护技术的探讨

深基坑工程支护技术是岩土工程中特殊土质道路施工过程常常遇见的问题.通过对深基坑支护类型的总结,提出了深基坑工程支护技术当前存在的一些问题,并对支护技术的发展趋势进行了展望.     

浅述深基坑工程的特点及其支护技术

深基坑工程的支护技术能够有效地控制基坑开挖过程中的围护结构变形位移,防止引起基坑外地面沉降,保证施工工期和安全。分析深基坑工程的特点,介绍各种深基坑工程的支护技术,并列出了深基坑支护应用中的注意事项和预防措施。     

深部软岩大断面硐室围岩稳定性控制技术

结合工程概况,针对顾桥煤矿主井箕斗装载硐室断面大、围岩松软及施工顺序多变等特点,提出采用"锚网喷+锚索"和钢筋混凝土综合支护的施工方案,并对其施工过程及支护技术进行了介绍,为类似矿山工程的建设提供了参考     

南京虹桥·新城市广场深基坑支护工程设计与施工优化

深基坑支护方案应综合考虑各种因素,但受施工技术、设计者经验影响,不确定因素较多.阐述了动态设计和信息施工法在深基坑支护工程中的应用,在施工过程中进一步对设计和施工进行优化,取得了很好的效果.     

试论矿区建筑深基坑支护的施工技术

主要对矿区建筑深基坑支护施工技术问题进行了重点分析,阐述了基坑工程是一门综合性、实践性很强的学科。但在现今实际的矿区建筑深基坑支护施工过程中往往会面临基坑越来越深的趋势,特别是在环境保护要求不断提高的今天,工程人员必须要以严谨的科学态度来对待深基坑支护施工问题,尤其是矿区建筑特殊地质条件下的深基坑支护施工问题。     

联合支护在云南社科大厦基坑支护工程中的应用

介绍了深基坑联合支护方式在云南省社会科学院社科大厦基坑支护工程的施工方案设计,降排水处理,简要设计验算过程、施工流程、应急措施等。     

土钉支护施工中常遇问题及其处理

根据土钉支护工程的施工实践及经验总结，介绍了土钉支护施工过程中的常遇问题及其处理方法.     

多种支护型式联合应用在深基坑支护工程中

土钉墙、喷锚网、排桩、深井降水等技术是基坑支护工程常用的技术手段.通过在大面积深基坑支护工程中对多种支护型式的联合运用,根据工程地质条件、支护要求等,合理选择施工参数,在施工过程中,严格按规范操作,达到施工目的.对同类型的工程施工有一定的参考作用.     

广州伊顿十八高层商住区基坑支护施工技术

概述了广州伊顿十八高层商住区基坑工程多种支护结构形式的设计和出现问题后的处理措施，对支护结构的施工过程和施工技术措施作了较详细的介绍。     

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