垂直预应力锚杆应用实例

垂直预应力锚杆是一种结合重力式支挡结构的辅助支护系统,自20世纪60年代起就在公路部门滑坡治理工程中得到应用,至今已有40余年,由于其占地面积小、施工方便、设置灵活,因此垂直预应力锚杆在边坡工程、滑坡治理、基坑支护、挡墙加固等工程中得到了一定的应用。分别列举边坡与基坑工程实例,详细说明垂直预应力锚杆的选型、设计与施工要点,并对这种支护方式的应用前景与适用范围做出了分析。     

变电站超规范高度填土边坡支挡结构应用研究

叙述了各行业规范中规定的边坡支挡结构极限高度,然后结合超规范高度填土边坡支挡结构型式,对广西变电站超规范高度填土边坡的支挡结构应用现状进行阐述,通过几种常用超规范高度填土边坡支挡结构型式的对比,指出了广西变电站超规范高度填土边坡支挡结构研究内容及应用前景。     

抗滑桩桩间支护结构分析

抗滑桩为滑坡、边坡治理工程中常用的治理措施,抗滑桩悬臂段间岩土体的支护关系到抗滑桩长期有效的运行。分析常用的桩间支挡结构及其适用条件,比较了按照土拱效应和主动土压力理论计算桩间土压力的差别,认为按照土拱效应进行桩间支挡结构设计是经济适用的。     

基于引力场的基坑悬臂式支挡结构设计与实践

基坑工程的质量依赖于科学合理的基坑设计、详细周密的地质勘察、精心细致的施工作业、可靠有效的实时监测。基坑工程的支护形式多种多样,悬臂式支挡结构就是其中之一,目前尚没有人能对悬臂式支挡结构确切的工作机理给出一个令人满意的解释,悬臂式支挡结构在坑底以下的嵌固深度计算也缺少可靠的理论公式,因此导致悬臂式支挡结构出现事故的现象时有发生,因此悬臂式支挡结构嵌固深度的合理确定就成了悬臂式支挡结构成功与否的关键。以长年的基坑工程实践与理论研究为基础,结合地球引力场理论,对悬臂式支挡结构确切的工作机理作出一个比较切合实际的解释,指出了支挡结构底部与接触岩土体间的摩擦力对悬臂式支挡结构稳定的关键作用,给出了悬臂式支挡结构嵌固深度计算的理论公式和工程实例。     

网格式加筋土挡土结构的稳定性分析与工程应用

以治理矸石山滑坡为目的,从增大矸石山边坡的侧向约束出发,提出了一种兼有加筋土挡土结构、锚定板挡土结构优点而又适合于治理矸石山滑坡的新型挡土结构———网格式加筋土挡土结构．对该挡土结构进行了作用机理及稳定性分析,给出了具体的结构形式和工程应用实例．     

七彩云南滑坡治理工程的勘察设计与施工

通过对七彩云南后山边坡滑坡工程进行勘察,应用复合支挡体系,采取有效措施,经科学施工,使滑坡得到有效治理。介绍了该滑坡治理工程的勘察设计与施工方法。     

桩板墙加固边坡作用效果及结构受力影响试验研究

作为边坡治理中的一种常用支挡结构，桩板墙主要依靠抗滑桩对滑坡进行加固，并利用桩间挡土板 防止桩间土体产生滑动，但其设计基于经验类比，桩板墙加固边坡过程中的受力分配、结构受力等机理还有待深入 研究。项目以实际工程边坡为依托，通过室内模型试验、数值模拟和理论分析，研究桩板墙加固边坡的加固效果、 挡土板对桩身受力的影响、桩板体系各自承担的滑坡推力大小、桩板结构各自的受力和变形规律等，并对桩间距和 挡土板强度等参数改变下桩板墙结构的变化规律进行了分析。研究表明：挡土板承担一部分滑坡推力，随着荷载 增加，挡土板承受的土压力不断增加，挡土板所受的土压力峰值均在滑体以下部分；不同加载条件下桩身所受滑坡 推力近似呈抛物线分布，滑坡推力峰值主要集中在滑面中下部；桩距较大时，两桩间土体呈拱形向下滑动，挡土板 对桩间土体下滑有一定的支挡作用；挡土板强度对边坡加固效果影响不大。研究成果可为桩板墙加固边坡设计提 供参考。     

有限元强度折减法在滑坡治理设计中的应用

以某铜矿炸药库边坡为例,按有限元强度折减法在考虑了支挡结构与岩土体共同作用的情况下,计算了该边坡抗滑桩内力,使边坡治理既安全又经济。     

陕西省镇坪县竹溪河街滑坡治理方案优选及治理效果

介绍了对陕西省镇坪县竹溪河街滑坡治理方案的优化选定过程,提出了4种方案进行对比分析,对确定的桩锚联合支挡方案及实施效果进行了论述。     

有限元强度折减法在滑坡治理设计中的应用

以某铜矿炸药库边坡为例,按有限元强度折减法在考虑了支挡结构与岩土体共同作用的情况下,计算了该边坡抗滑桩内力,使边坡治理既安全又经济。     

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     

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     

2014 second batch of rare earth quota released

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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     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.