钟祥市斑竹垱岩溶地面塌陷成因与治理效果分析

钟祥市斑竹垱岩溶地面塌陷是典型的采矿降水疏干影响区地面塌陷。该岩溶地面塌陷的形成与岩溶发育程度、水文地质条件、人类工程活动密切相关,构造破碎带(断裂)促使地下水富集带发育岩溶,岩溶管道和溶洞为塌陷提供空间条件,采矿降水改变疏干区地下水径流途径诱发塌陷形成。采用注浆加固、回填、河床整治、绿化等工程对斑竹垱岩溶地面塌陷区进行综合治理,取得预期建设效果。     

乌江渡水电站岩溶地区高压灌浆施工特殊情况的处理

乌江渡水电站扩机地下厂房防渗帷幕工程身处岩溶发育地区，工程地质条件复杂，地质构造以层间错动断层为主，并有部分陡倾角断层发育，岩层受构造挤压强烈，断层、节理、破碎带发育；水平岩溶、垂直岩溶发育。以此工程为例介绍了高压灌浆施工工艺，阐述了岩溶地区高压灌浆过程中出现的特殊问题并提出了处理措施。     

鄂西南表层岩溶带岩溶个体形态特征及分布规律

鄂西南岩溶地区表层岩溶个体形态复杂多样,规模大小不等,按其发育规模大小之不同划分为小型和大型两类岩溶个体形态。表层岩溶带与鄂西南地区岩溶地质环境条件及岩溶发育演变的历史过程密切相关。通过地质原型调查,采用系统工程地质分析为主体的方法体系,从地质过程的宏观尺度出发,研究了表层岩溶带在不同的地质构造部位、地层岩性条件下,地形地貌部位、岩溶发育程度及覆盖程度上的发育差异,详细论述了表层岩溶带岩溶个体形态发育特征及其空间分布规律。首次阐明了表层带岩溶个体形态的规模从山顶、山脊到山脚,沟谷内具有由小到大的总体变化规律。小型岩溶个体形态具有无处不在、分布发育密集丰富的特点;大型个体岩溶形态则主要发育分布于各级岩溶台面的平台及沟谷内。进而提高了对“表层岩溶带”概念的认识,深化了表层岩溶带范围的理解。     

探地雷达在岩溶探测中的应用

该文介绍了采用探地雷达技术对某水库坝址区岩溶进行了探测,确定了探测区岩溶、破碎带和裂隙发育带的位置和规模,并通过钻孔得到了验证。探测成果为工程设计提供了依据。通过该工程实例,说明了采用探地雷达技术进行岩溶探测是可行的,探测成果是准确可靠的。     

鄂尔多斯盆地苏里格地区奥陶系马家沟组古岩溶特征

鄂尔多斯盆地苏里格地区古岩溶对天然气成藏具有重要意义。根据岩溶的发育机理、先后顺序、持续时间、特征、影响因素以及与储集空间类型等,可以识别出同生期岩溶、表生期岩溶和埋藏期岩溶三种类型的古岩溶。古岩溶具有明显的分带性,分为地表岩溶带、垂直渗流岩溶带、水平潜流岩溶带和深部缓流岩溶带。岩性、构造和成岩环境是控制岩溶发育的主要因素。     

南京长江第四大桥南接线某段岩溶地质问题研究

南京长江第四大桥南接线某段以碳酸盐岩为主、岩溶发育,已成为制约该段工程的主要地质问题之一.根据现场勘查和地质资料,阐述了研究区的岩溶发育情况,分析了岩溶的发育条件以及该区岩溶发育的控制因素,并在一定程度上总结了岩溶发育的规律及特征,对后期设计、施工过程中做好相应的防范准备工作具有指导意义.     

鄂西南表层岩溶带的富水性探讨

鄂西南岩溶地区表层岩溶个体形态复杂多样,表层岩溶带与鄂西南地区岩溶地质环境条件及岩溶发育演变的历史过程密切相关。通过8个重点段、241 km2范围内529个表层带岩溶水点的地质原型调查,采用系统工程地质分析为主体的方法体系,研究了表层岩溶水在不同的地质构造部位、地层岩性、地形地貌、岩溶发育强度和不同结构条件下的出露分布特征及其变化规律,详细论述了表层带岩溶发育差异、表层带岩溶水点露头密度和其平均地下径流模数,并据此将表层带岩溶水含水层的富水性划分为强、中、弱三级,阐明了表层带岩溶水在纯碳酸盐岩含水层中富水性最弱,不纯碳酸盐岩含水层中富水性最强的特征。     

影响岩溶发育因素的几点探讨

碳酸盐类岩形成的岩溶给许多工程建设带来难度,由于岩溶发育的复杂性,增加了工程地质勘察成本.通过调查了解建设场地内地质构造、水文地质条件、岩性矿物化学成份等有关影响岩溶发育因素,分析岩溶形成规律、发育地段及发育规模,从而指导勘察施工,对提高勘察效果,节约建设成本有着积极的作用.     

鄂西南岩溶地区表层岩溶带结构特征及其分布规律

通过对鄂西南建始县建阳坝、恩施市太阳河、恩施市白杨坪、宣恩县椒园、咸丰县龙坪等八个地段总计238 km2范围内1∶ 1万的表层岩溶带调查,划分了表层岩溶带的单层、双层、三层结构类型,同时结合全区表层岩溶带遥感解译成果,分析研究了其分布发育规律,为鄂西南贫困岩溶石山地区表层岩溶带的深入研究创造了条件.     

潞安矿区奥陶系岩溶演化主控因素分析

通过野外调查、室内实验与钻探资料对比分析对潞安矿区奥陶系岩溶演化主控因子特征进行研究.结果表明：1）加里东-海西期老岩溶形成在奥陶系顶部的峰峰组内;新构造运动期新岩溶只发育在裸露区-浅埋区和新断裂带上,形成多层水平岩溶洞穴.2）中奥陶统存在3个韵律结构使浅部新岩溶发育产生强弱相间的层控现象;石膏层的膏溶作用产生了膏溶角砾岩带、压碎岩带和裂隙带,是泥灰岩段成为裂隙岩溶含水段的主因.3）浅部走向强径流带与贯穿深浅部的逆倾向弱径流带的共同作用,使CaCO3,MgCO3溶蚀区域很局限,新岩溶只在浅部与老岩溶叠加;中深部老岩溶和陷落柱处于沉淀充填状态.4）新构造断裂带是矿区西部岩溶地下水获得浅层地下水越流补给的通道,也是弱富水区中强富水带.     

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