松软岩土巷道塑性破坏效应分析

结合金山店铁矿粉矿巷道塑性变形的特点,分析了松软岩土巷道塑性破坏的原因及引起塑性破坏的地压形成过程,探讨了影响松软岩土巷道稳定性的破坏效应,为有效地控制巷道的塑性破坏提供了可供参考的理论依据。     

松软膨胀岩层巷道破坏机理及加固技术研究

松软臌胀岩层的井下巷道支护是目前矿山建设中的一个主要难点.针对霍州煤电集团白龙煤矿的具体条件,对井下巷道的破坏形式及破坏机理进行了分析,在此基础上,提出了合理的修复加固方案.实践表明,应用效果显著.     

高应力软岩巷道高强度稳定型支护技术研究

针对米村矿28变电所的破坏状况，分析了28变电所失稳机理。根据巷道围岩变形破坏和现有支护状况，提出了适应于高应力松软巷道的高强度稳定型支护方案。     

煤矿千米深井巷道松软煤体高压锚注-喷浆协同控制技术

针对煤矿千米深井巷道松软煤体大变形难题,以中煤新集口孜东矿大采高工作面运输巷为工程背景,分析巷道松软煤帮变形破坏特征及支护结构破坏、失效形式;采用井下试验和数值模拟相结合的方法,从锚杆锚索锚固力衰减、风化作用下煤体劣化及强流变性等方面,揭示出千米深井巷道松软煤帮大变形机理。提出千米深井巷道松软煤帮高压锚注-喷浆协同控制理念;采用数值模拟对比研究了锚杆锚索支护、锚注、锚注-喷浆3种方案巷道煤帮变形、裂隙及应力演化规律,阐明了巷道煤帮高预应力、高压锚注-喷浆协同控制原理。研发出高强度、高压、组合式注浆锚杆与高压注浆锚索,研究了注浆锚杆、锚索及注浆材料性能与锚注效果,形成了高预应力锚杆、锚索支护-高压劈裂注浆改性-表面喷浆协同控制技术。将研究成果应用于中煤新集口孜东矿,提出试验巷道锚注-喷浆协同控制方案及参数,并进行了矿压监测。监测数据表明,采用提出的高压锚注-喷浆控制方案后,煤帮结构、完整性与强度得到显著改善,锚杆、锚索锚固力大幅提升,充分发挥了高强度锚杆、锚索主动支护作用。巷道两帮收缩量降低86%,锚杆、锚索破断率大幅减少,有效控制了千米深井巷道松软煤帮大变形,为此类深部巷道大变形控制提供了有效途径。     

高预应力锚索支护优化方案探讨

通过科学分析地质条件和巷道破坏机理,采用高预应力锚索支护优化方案,解决了煤巷掘进期间的煤质松软、巷道变形大、多次维修及施工成本高等难题,为巷道安全快速掘进提供了条件,也创造了较好的经济效益。     

松软煤层小煤柱动压巷道支护技术研究及实践

为解决松软煤层小煤柱动压巷道支护的技术难题,以漳村矿2202工作面回风巷作为研究背景,通过相似模拟实验对采动压力作用下的松散煤层巷道变形破坏特征进行了研究,在此基础上,对回采巷道合理的支护方式及支护参数进行了设计。并通过FLAC3D数值模拟和工业试验验证了其方案能够有效地控制松软煤层小煤柱巷道围岩的变形。     

含水软岩巷道大变形破坏机理及耦合支护技术研究与应用

基于榆树井矿巷道处于极松软含水地层中,巷道围岩变形大、难以支护现状。利用FLAC3D数值模拟软件分析了巷道围岩应力重分布及变形破坏特征,并最终研究得出耦合支护对策和方案,并进行现场工业性试验和效果监测。     

常村煤矿副井马头门的破坏与修复

由于围岩松软及巷道密度过大，常村矿副井马头门发生破坏，本文简介其破环情况、修复方案及实施结果。     

深井节理化围岩巷道破坏机理及控制技术

针对平顶山矿区深井巷道稳定性控制问题,以典型节理化围岩巷道为研究对象,采用离散元数值模拟方法研究了巷道围岩的变形破坏过程,分析了其破坏机理,提出了巷道围岩控制技术。研究表明：巷道首先在拱顶、底板中央区及两侧边墙受张拉破坏,拱肩及两侧底角受剪破坏,破坏区范围逐渐向深部扩展直至失稳。现场实测数据表明：在方案实施2个月后,锚杆、锚索受力在较高值趋于恒定,充分发挥了支护作用;水平收敛、拱顶下沉和底臌趋于稳定,大规模松软巷道围岩稳定性得到有效控制。     

南屯煤矿深部松软煤层巷道支护技术研究

南屯煤矿深部松软煤层巷道，在掘进过程中顶板破碎，伴有大量顶煤冒落且围岩破坏严重。论文主要针对不同支护条件和巷道围岩破坏状况进行数值模拟分析，结合实际情况制定了深部软岩巷道的支护方案。现场监测表明，巷道围岩得到了有效控制。     

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 materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

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.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

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.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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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