深井软岩巷道合理支护方案优化研究

为解决深井煤矿软岩巷道支护变形破坏与支护结构失效问题,基于理论分析、试验模拟与围岩松动圈测试等技术手段,提出"锚网喷初次支护、预应力锚索二次支护、二次注浆、底板锚注"分步联合修复技术方案。采用数值模拟方法验证分步联合修复技术方案的合理性。数值模拟结果表明:随着支护强度的提高,围岩的整体强度有所提高,有效地控制了巷道围岩塑性区的损伤扩展和围岩大变形。     

高应力弱胶结围岩巷道修复加固技术

清水营煤矿副立井＋786m水平井底车场巷道为高应力弱胶结围岩,巷道施工后,部分地段变形破坏严重。根据对变形破坏原因的分析,采用刷大断面,一次锚网喷＋锚索＋U型钢棚联合支护,二次锚注支护的方案进行修复加固,有效地控制了围岩变形,取得了良好的效果。     

深部软岩应力集中带高强耦合支护技术研究与应用

针对深部应力集中带软岩巷道变形破坏严重,传统联合支护技术难以控制问题,结合鹤煤八矿-655 m水平南大巷返修工程实践,通过理论分析及现场观测的手段,提出设计了锚网梁索与注浆锚索高强耦合支护技术并进行了现场应用,得出锚网梁索与注浆锚索是具有锚网喷支护与注浆加固共同作用的一种耦合主动支护方式,可以改变围岩力学参数,提高围岩强度。工程实践表明:该支护方案可显著提高围岩的强度和承载能力,有效地控制了深部软岩巷道变形,支护效果明显。     

富水泥化巷道渐变破坏机理与局部失稳控制技术

针对祁东煤矿南翼运输石门围岩富水泥化难以维护的问题,采用工程地质调研、数值模拟、现场实测方法对巷道支护失效机理和支护方案进行了分析。结果表明南翼运输石门的支护失效机理是泥质围岩弱化效应和岩石流变渐进破坏作用;为改善围岩自身承载能力,实施了"锚网索注"联合支护方案。数值模拟与工程实践表明,实施锚网索注联合支护后,与原锚网喷支护方式相比,巷道围岩变形量平均缩减55.75%,对富水泥化巷道稳定性控制效果显著。     

恒源煤矿深部巷道围岩控制技术

在分析了恒源煤矿深部矿井巷道围岩变形破坏的原因的基础上,提出了一次支护锚网梁喷支护、二次支护锚网梁+锚索联合支护、底板支护、混凝土整体浇筑地坪的技术方案。工程实践表明,巷道围岩得到了有效支护。     

大断面巷道交叉点破坏机理分析及支护研究

为了解决马钢集团和睦山铁矿区大断面巷道交叉点支护困难的工程问题,对该矿巷道破坏情况进行了调查和研究。利用电子显微视频仪发现了造成岩石局部局部应力集中及破坏的岩石包体特殊结构,查明了巷道破坏的原因。在此基础上,提出了锚网喷一次支护,锚注与锚索联合二次加强支护的复合支护方案。利用ABAQUS非线性有限元软件模拟分析了锚注联合支护的作用机理,数值计算结果验证了支护方案的合理性。现场施工监测表明,采用联合支护方案后巷道交岔点处围岩变形趋于稳定,两帮累计位移最终为20 mm左右,取得了良好支护效果。     

深井高应力巷道围岩强力-分次支护协调控制技术研究

为解决深井高应力巷道围岩变形破坏问题,结合强力支护理论及巷道围岩变形与支护时机关系分析了深井巷道强力-分次支护的力学机制,提出了一次锚网喷、二次全断面锚注配合底板鸟笼锚索相协调的强力-分次支护技术,现场应用实现了深井巷道围岩变形可控。结果表明：随一次强力支护时间延长,深井巷道围岩变形速度先降低后变缓再突然增加,二次支护的最优时机为围岩变形速度变缓阶段。     

基于数值模拟分析的富水软化岩层交叉巷道支护技术研究

针对某矿交叉巷道围岩裂隙发育、岩层遇水软化、整体强度及稳定性极低,普通支护方式无法控制的工程难题,对其围岩力学性能、矿物成分及地下水影响进行变形破坏机理分析;并建立交叉巷道的数值模型,揭示了巷道围岩在富水情况下的变形破坏规律及不同工况下的支护效果,提出了锚网喷+锚索+锚注的联合支护方案。现场监测数据表明,联合支护文案可有效地封堵裂隙渗水、提高巷道围岩的整体承载力,较好的实现了控制围岩变形及巷道的长期稳定。     

锚网喷、锚索联合支护在深部矿井巷道中的应用

以芦岭煤矿三水平石门支护为工程背景,根据现有的支护措施、围岩变形破坏状况及围岩力学分析,总结了巷道变性破坏的主要原因,提出错网喷、锚索联合支护方案,运用FLAC模拟软件对巷道位移场及围岩塑性区分布特征进行模拟计算,并通过现场矿压观测结果分析,该支护方案成功控制了巷道围岩的破坏变形,取得了良好的支护效果.     

锚喷注浆联合支护技术在巷道修复中的应用和效果

文章结合恒源煤电公司45轨道上山修复实际情况,分析研究了普通锚网喷支护的岩石巷道的变形特点和破坏原因,介绍了锚喷注浆联合支护技术的施工特点,通过对实施锚注联合支护技术在该巷道修复中的应用前后的分析对比,证明锚注联合支护技术对修复破坏的普通锚网喷巷道具有较为理想的支护效果,可以实现较好的经济利益。     

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.