饱和土液化计算程序(yh-1)

1前言饱和土液化判别是地基基础抗震验算的重要内容之一。以往他和土液化计算都是采用手工方式，既麻烦、费时，又容易出错。本程序提供了一种快速准确的计算方法。2编制程序的依据本程序是根据《建筑抗震设计规范》（GBJ11—89）有关规定编制的。3程序功能本程序可用于计算饱和粉土或砂上液化判别的标准贯入锤击数临界值和地基的液化指数，将实测标准贯入试验锤击数与液化判别的标准贯入锤击数临界值进行对比，当从。。＞Ncr时，饱和土不液化，否则饱和土液化。并根据地基的液化指数确定地基的液化程度。4使用说明4·l标识符KH——钻孔…     

武汉市饱和粉、砂土的振动液化性分析研究

首先对影响武汉市粉土和砂土液化的地质属性和人为因素进行分析;再选择有代表性的工程地段进行液化判定与液化指数的计算;最后得到武汉市饱和粉、砂土的振动液化性的灾害程度及需要重点防治的地段范围,达到对武汉市饱和粉、砂土振动液化性量化分析研究的目的。对本地区的工程环境评价、建筑抗震设计、地基基础设计与施工有实际的参考意义。     

上海四平大楼加层的工程地质分析

结合上海四平大楼加层工作，根据该建筑物初建时与加层时的两次勘探资料，从工程地质角度，对加层中的砂土液化以及加层引起的建筑物附加变形问题进行了分析探讨。分析结果表明，软土地区建筑物本身荷载的长期作用，对了二改善与提高地基土强度以及砂性土层的抗液化性能是非常有益的。     

顶管施工在砂性土中的顶力分析

本文介绍了泥水平衡式顶管机在砂性土中的顶进情况，将顶力变化趋势以图表的形式表现出来，反映了实际顶进的曲线变化，并针对砂性土施工的一些问题深入分析其成因，提出相应的处理方法，进一步理解了泥水平衡、注浆减阻等概念，为今后在类似土质中顶进积累了经验。     

某岩溶发育地区稳定性综合评价及预防措施

以京杭大运河徐州段某码头场地为例,从场地工程地质特性出发,将场地地基稳定性影响因素划分为岩溶地面塌陷、饱和砂（粉）土液化及软土沉陷3种,在此基础上结合模糊数学方法对场地岩溶发育程度进行定量分析。结果表明,研究区岩溶地面塌陷模糊判别指数W值介于025~075,属相对稳定亚区;饱和砂（粉）土场地液化指数小于6,场地液化分区属轻微液化区;软土分布不均,且厚度变化大,可采用提前加载压固处理消除影响。研究成果为类似岩溶发育地区的稳定性评价提供可行的参考经验。     

浅谈新疆开都河博湖县城区段应急防洪工程砂土液化问题

新疆开都河博湖县城区段应急防洪工程主要分布有第四系粉砂、细砂、中砂等易发生地震液化的土层,有的已产生破坏,对拟建的堤防具有较大的潜在威胁,影响堤防的正常生产运行。通过查明液化土层的分布、深度、液化等级,对堤防地基土的液化土层进行抗液化处理,避免地基土不均匀沉陷和开裂对堤防地基造成破坏,以期从根本上解决堤防地基的液化破坏,保证堤防的正常运行。     

黄河阿什贡电站砂土振动液化问题分析与处理

对阿什贡电站坝址区砂性土层存在的砂土振动液化问题进行分析,对泄水闸地基采用振冲碎石桩处理,对船闸地基采用高压旋喷桩处理,对左岸土石坝段进行回填压盖处理,并对压盖后的坝基砂性土层进行抗震复核计算,以论证该处理方案在理论上的可行性.     

基于超重型动力触探判别砾石土液化在工程中的应用

饱和砾石土层存在地震液化的可能,但其地震液化判别,目前尚缺乏有效可靠的检测方法和判别标准,国内现行规范明确采用标准贯入临界锤击数法及相对密度法进行砂土液化复判。但由于砾石土中很难进行标准贯入试验,取值难度很大,标准贯入临界锤击数法不适用于砾石土;而水位以下饱和砂砾石层难以获取其天然密度、含水率等指标,相对密度法可操作性亦不强,导致砾石土的液化复判无可靠依据与方法。采用超重型动力触探临界锤击数法判别砾石土土体液化势,并已成功运用于工程实践,对今后类似土体液化判别有很好的参考作用。     

砂石桩法在某大型水利工程中的应用

某大型水利工程渠道施工区为黄河、沁河冲积平原,渠基上部地层为粉砂、细砂,呈松散状态,地下水位较高,地基土存在砂土震动液化问题,为了解决该问题,采用了砂桩复合地基对该地层进行处理,为该方法处理同类大型工程的地震液化提供一定的借鉴。     

简析饱和砂类土、粉土的液化判别公式

从砂土液化的机理，联系砂类土、粉土的液化判别公式，简要分析了判别公式中折减系数α1、α3、α4的意义，有助于进一步加深对公式的理解和应用。     

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

正~~     

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