黑岱沟露天矿阴湾排土场滑坡治理技术优化

受基底赋存水、软弱层及排弃增高等因素的影响,阴湾排土场西帮发生了变形。为避免变形加剧导致滑坡,需采取合理的防治措施。依据现场工程地质条件,设计了抗滑桩和排土压脚2种滑坡治理方案。抗滑桩方案根据排土场边坡可能发生的滑坡模式,设计了抗滑桩参数,可快速增加滑体抗滑力。排土压脚方案通过增加边坡下部岩土体自重,提高了滑坡整体稳定性,并进行了压脚区的防排水设计。结合现场情况,通过可行性及经济分析对方案进行对比,最终选取了排土压脚方案。     

扎哈淖尔露天煤矿软弱基底排土场变形区治理研究

以扎哈淖尔露天煤矿排土场为工程实例,基于有限元法应力-应变和极限平衡分析,应用SIGMA/W有限元软件进行模拟分析,研究了软弱基底排土场基底变形破坏特征和工程治理措施。根据基底的变形情况和数值模拟结果,对现状排土场边坡进行稳定性评价,得到排土场边坡滑坡模式为推动式的部分切层-顺层-挤出性滑动,边坡处不稳定阶段;通过对排土场边坡坡角处压脚、坡顶卸荷减载2个方案比较,提出最合理的软弱基底排土场的变形治理措施。     

阴湾排土场压脚区防排水设计优化

准格尔黑岱沟露天矿阴湾排土场是典型的黄土基底排土场,为确保大准铁路路基和阴湾排土场西侧边坡的稳定性,在压脚排土区域设置地面防排水系统,在排水沟参数设计时基于谢才公式对排水沟底宽进行数值优化。     

安太堡露天矿排土场边坡稳定性分析

为研究安太堡露天矿内排土场边坡稳定性,采用GEO-slope对内排土场3个不同位置剖面进行稳定性分析并给出了边坡稳定性控制措施。分析结果表明:内排土场南部区域高段排土边坡变形方向为北东方向;边坡现场变形区域与破坏机理分析区域相一致,主要为单台阶或多台阶沿排弃物料内部的滑动变形;压脚可以有效减小边坡变形,提高边坡稳定性。     

阴湾排土场增高扩容稳定性研究

在广泛收集研究区内以往研究成果的基础上,通过对阴湾排土场基底钻探勘察和室内岩土物理力学参数试验研究,采用极限平衡理论和数值模拟方法对阴湾排土场增高扩容后的边坡稳定性进行了研究。对排土参数进行了优化分析,对排土场堆载基底承载力进行了数值模拟监测分析。监测结果显示,按推荐的排土参数排土,排土场基底承载力不会发生突变与破坏。     

贺斯格乌拉露天煤矿排土场稳定性分析与治理

排土场边坡稳定是确保露天矿安全高效生产的前提条件。为确定贺斯格乌拉露天矿北排土场的滑坡模式,基于摩尔-库伦强度准则与折减理论,运用FLAC有限差分模拟与极限平衡分析技术,对贺斯格乌拉露天矿北排土场进行了模拟分析与研究,确定了沿基底软弱层滑动的滑坡模式。研究分析结果表明,贺斯格乌拉露天矿北排土场BP-1剖面位置塑性区已全部贯通,边坡处于失稳状态,基底弱层附近产生的应力集中是边坡发生顺层剪切破坏的主要因素。通过分析北排土场建设情况、经济因素及环境条件,对北排土场边坡滑坡采取排土压脚综合治理措施,治理后的边坡稳定性系数为1.214,使边坡达到了稳定状态,为同类滑坡灾害治理提供了可靠性依据。     

将军戈壁二号露天煤矿外排土场软弱基底坐落-牵移式滑坡机理

以新疆天池能源有限责任公司将军戈壁二号露天煤矿外排土场软弱基底为研究对象,通过对研究区岩土进行常规力学实验及流变试验,确定了该露天矿排土场基底及排弃物料物理力学指标。结合理论分析,确定排土场边坡滑坡模式为坐落-牵移式并对滑坡机理进行分析。建立排土场稳定性分析数值模拟模型,模拟排土场边坡变形破坏形式,计算分析了排土场边坡稳定性,结果表明,排土高度为120 m时,潜在的滑移面贯穿排土场内部及软弱基底层,边坡稳定系数略低于安全储备系数。     

凹山排土场坡脚挖损后的安全评价及治理方案

为了评价凹山排土场被挖损后的稳定性,并提供相应的治理方案,对基底的地层结构和边坡内部的水流进行分析,明确了该排土场不存在形成泥石流的隐患。根据排土场的边坡特点,选择极限平衡法进行稳定性计算,按照排土程序和堆载时间的差异进行分层参数赋值和建模。采用GEO-studio对排土场进行稳定性分析,结果表明:排土场现状稳定系数为1.023,采用回填压脚的方式,可提高排土场稳定性。排土场稳定性随着回填压脚宽度的增大呈线性增长,当压脚宽度达到15.9 m时,稳定系数达到1.20以上。     

内排压脚技术在边坡治理中的应用

以五彩湾矿区一号露天煤矿为例,采用数值模拟和极限平衡法分析边坡变形原因、潜在滑坡破坏模式及边坡稳定性情况,用内排压脚技术对边坡进行治理。通过建立不同压脚参数的工程地质模型进行边坡稳定性计算并结合边坡GPS监测数据,得出合理的内排压脚参数为内排增高2个台阶,每个台阶15 m,平盘宽度40 m。同时对边坡上出现的裂缝进行平整与压实以防雨水渗入,并对边坡坡面上加设一层防风化表层以隔离大气的影响,达到更好的边坡治理效果。     

FLAC~(3D)在宝日希勒露天煤矿内排土场边坡稳定性应用分析

随着采剥工程的发展,宝日希勒露天煤矿排土场从2004年开始逐渐内排。由于内排土场稳定性较差,所以运用Flac3D数值模拟方法对内排土场的边坡稳定性进行分析,直观地得到了坡体的滑移破坏面,采用强度折减法模拟了岩体变形、破坏,直到边坡岩体发生滑坡的整个过程。揭示了滑坡机理,确定了边坡滑坡模式,从而对边坡稳定性作出了科学评价,为边坡的综合治理和控制措施以及科学的检测方案的提出提供了科学依据。     

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

正~~     

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.