膨胀土路堑滑坍原因分析及治理

结合实际工程中所遇到的膨胀土滑坡问题,分析了导致高速公路膨胀土路堑边坡多次发生坍滑的主要原因.认为路堑初次产生滑坡主要是由于原设计边坡过陡、施工前防截水措施不到位、施工过程中支护不及时所致.在进一步补充勘查的基础上,对该段膨张土路堑滑坡治理的设计作了相应的修改,使滑坡问题得以解决,为工程的安全运营提供了保障.     

膨胀岩路堑边坡稳定性探讨

膨胀性软岩边坡稳定问题是吉珲高速公路建设中所面临的重要工程地质问题 ,为使路堑边坡加固方案合理 ,避免滑坡、塌方等现象的发生 ,基于吉珲高速公路膨胀性软岩试验研究结果 ,探讨了该地区软岩路堑边坡的变形力学机制 ,并以典型坡面为例进行了路堑边坡的稳定性分析 ,提出了有针对性的工程加固对策     

膨胀岩路堑边坡稳定性探讨

膨胀性软岩边坡稳定问题是吉珲高速公路建设中所面临的重要工程地质问题，为使路堑边坡加固方案合理，避免滑坡、塌方等现象的发生，基于吉珲高速公路膨胀性软岩试验研究结果，探讨了该地区软岩路堑边坡的变形力学机制，并以典型坡面为例进行了路堑边坡的稳定性分析，提出了有针对性的工程加固对策。     

浙江高速公路运营期边坡安全风险调查研究

20多年来,浙江省高速公路边坡病害呈多发频发态势,为此针对浙江省内多条高速公路运营期边坡安全风险调查研究。结果表明:浙江省内高速公路边坡大部分安全性能良好,仅需日常巡查和养护;部分边坡需进行适当巡查与监测和及时进行防治处理;土质边坡中Ⅱ类边坡比例达32%,有必要加强对土质边坡的安全监测和巡视,防止Ⅱ类土质边坡转化为Ⅲ类,而危害高速公路的正常运营。     

花岗岩类土质边坡特性及稳定性分析

花岗岩类土质边坡具有类似土的性质,但与均质土坡存在明显区别,其具有类土质边坡固有的特性从而影响边坡稳定性分析方法.总结了类土质边坡的特性,归纳出几种常见的破坏类型和分析方法,并就不同破坏机理采用不同的稳定性计算方法,为类土质边坡稳定性分析、边坡加固和滑坡防治提供理论基础.     

基于FLAC~(3D)的红黏土边坡处治研究

针对某高速公路K127+500处右侧土质高边坡的坍塌滑坡问题,通过路堑边坡滑坡灾害特征、失稳破坏原因和工程地质条件的综合分析,提出了2种处治技术方案,利用FLAC~(3D)数值软件分别对2种处治方案进行了数值计算,然后再从工程造价、施工技术、占地和对环境影响等方面对其进行方案比选。     

林家溪滑坡成因机制分析与稳定性评价

上海—瑞丽高速公路途经林家溪古滑坡①中下部,路堑边坡开挖后发生较大范围坍滑破坏。分析林家溪古滑坡形成机制,并进行滑坡以及路堑边坡的稳定性计算评价,为公路边坡工程设计提供依据。     

延平西站土质深路堑边坡稳定性分析与加固措施研究

延平西站土质深路堑边坡高度为83.6 m,具有地层结构敏感、开挖防护和支挡难度大、坡面防水要求高等特点.通过开展自然边坡、第一阶段开挖边坡、第二阶段开挖边坡、永久边坡四种工况在自然及降雨情况下的稳定性分析,提出了边坡防护、排水和监控措施,有效解决了该土质深路堑高边坡的稳定安全问题.     

高速公路石质深路堑边坡评价、设计及施工信息化控制综述

该文以博莱高速公路为例,从边坡稳定性评价、边坡设计、防护工程及施工监控、尤其是控制爆破等多方面探讨了山区高等级高速公路石质深路堑边坡问题,强调了高大路堑边坡工程的信息化控制原则。其对山区石质深路堑边坡处理有一定的参考价值。     

巫奉高速公路K39+300滑坡稳定性分析及治理探讨

针对杭州-兰州高速公路巫山-奉节段A16标K39+100～+320段开挖路堑边坡引起的滑坡问题,在对老滑坡的滑动历史、发展过程及变形破坏特征等进行调查研究的基础上,对产生滑坡的原因进行了深入分析,并提出了排水、抗滑桩和锚杆等综合处治措施.     

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