重型动力触探、标准贯入试验在振动挤密碎石桩复合地基检测中的应用

通过对振动挤密碎石桩复合地基的检测，介绍了重型动力触探、标准贯入试验测试技术在软弱地基土复合地基处理效果评价方面的应用。     

沉管挤密碎石桩充水预压处理油罐软土地基实例

目前．沉管挤密碎石桩已广泛用于加固地基．但在软土地区应用时其复合地基的承载力较低，通过充水预压可使复合地基承载力进一步提高．可拓宽挤密碎石桩的应用范围。结合工程实例说明其加固效果。     

北京上庄东路巨型砂石坑回填路基复合处理技术

根据北京上庄东路巨型砂石坑的地质条件及周边情况,采用振冲碎石桩、强夯置换及强夯复合地基处理技术与重锤夯扩挤密碎石桩对砂石坑回填路基进行综合处理。在高水位的情况下,对由软土和建筑垃圾回填形成的砂石坑,采用振冲碎石桩作为砂石坑渗水通道,通过强夯置换形成纵向增强体并加大处理深度,最后采用强夯处理的复合处理方案;对于桥桩两侧的回填土路基则采用重锤夯扩挤密碎石桩方案,减少对桥桩的影响。     

碎石挤密桩的施工技术及质量控制

黄河古道区域存在大量的不良地基,工程地质条件差。建筑设计中常采用挤密碎石桩复合地基进行处理。挤密碎石桩施工因地质情况复杂、工期短、施工难度大。结合某住宅小区工程的建设,对挤密碎石桩施工过程、工艺、质量、控制流程和控制要点以及复合地基的检验和验收等方面提出了相应措施。     

分段振动冲压挤密碎石桩加固填土地基

在振动沉管挤密桩施工工艺基础上改进而成的振动成孔、管外加料、分段振动冲压挤密碎石桩工艺 ,对回填土地基的加固效果显著。该工艺具有操作简单、造价低、施工速度快、复合地基承载力提高幅度大等优点 ,具有推广价值     

软土地基上振冲碎石挤密桩施工技术

介绍了射水振冲挤密碎石桩加固软土地基的方法要点及出现问题的处理     

地基综合处理的成功实例

本文介绍了采用人工挖孔碎石桩、振动挤密碎石桩和强夯相结合的地基综合处理方法,解决某选煤厂筛分贮煤车间地基的成功实例。文中涉及的内容有地基处理方案设计、试桩和试夯、地基处理施工和检测等。     

振动挤密碎石桩处理可液化地基初探

可液化地基遇地震产生液化 ,失去承载能力 ,对建筑物产生破坏。通过工程实例说明 ,采用振动挤密碎石桩处理可液化地基 ,可有效消除液化 ,提高地基土承载力。并分析了振动碎石桩消除地基液化的机理     

振动沉管碎石桩在公路软土地基的应用

以公路软土地基处理为例,详细阐述了振动沉管碎石桩处理软土地基的加固机理、加固设计方案、施工方法。如何根据实际地质条件合理地确定振动沉管碎石桩桩径、桩点布置形式、桩间距、桩长及复合地基承载力特征值等参数。根据检验结果和测试数据,对处理效果进行了分析和评价。     

重锤挤夯碎石桩施工技术

利用振动水冲法或重锤挤夯法在可压缩性土中成孔,再在孔内分批填入碎石等坚硬材料制成一根根桩体,这种桩叫碎石桩。这些桩与地基土一起构成复合地基,使地基承载力提高,压缩性减少。用碎石桩加固软土地基,在国外已有近     

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