小厂坝矿区岩爆倾向性研究

岩爆倾向性是研究岩爆发生机理及发生机制的基础,本文采用脆性岩爆指标、Barton岩爆指标、弹性变形能岩爆指标和冲击能岩爆指标对矿体及上盘、下盘主要围岩进行了岩爆倾向性研究,根据各指标的评价结果进行了综合评判。研究结果显示,矿体和下盘围岩属于强岩爆倾向性,在矿体开采过程中,应加强对地压变化的监测,采取适当措施,采用合理的开采方式及开采顺序,降低岩爆发生的概率和强度。     

花脑特矿区基于变异系数-突变级数法的岩爆倾向性综合预测

为了准确预测花脑特矿区深部中段岩爆倾向性,选取岩石单轴抗压强度、冲击能量指数、弹性应变能指数、地应力指数和RQD值等五个指标,通过地应力测量、室内岩石力学试验、Sirovision岩体节理裂隙调查,获得岩爆倾向性单指标评价结果,同时引入变异系数-突变级数法建立岩爆多指标评价体系,利用岩爆倾向性单指标评价结果计算突变级数值,并与岩石实际岩爆等级进行比较分析。分析结果表明,样本突变级数值与实际岩爆等级存在正相关关系,可以进行岩爆倾向性预测。研究结果表明：变异系数-印第安人茅舍突变级数值法在白音呼布花脑特矿区具有较好的适用性,可作为矿山后续工程中岩爆倾向性预测依据。     

大厂105号矿体深井开采岩爆倾向性研究

大厂105号矿体的埋藏深度在1km左右,目前正在进行开采前期的勘探和设计。通过室内岩爆力学试验,分析了该矿体2种典型岩石的弹性变形能指数Wet、冲击能指数Kcf、岩石脆性系数B和最大储存弹性应变能指标Es。结果表明:围岩无岩爆倾向性,锡矿石具有弱岩爆倾向性。     

深部开采矿山岩爆倾向性研究

岩爆是深部开采中最为常见和严重的岩体破坏现象。针对湖北某矿深部开采过程中遇到的岩爆问题,分别采用脆性系数判别法、弹性变形能指数判别法、冲击能指标判别法、岩体结构判别法对该矿3种岩石的岩爆倾向性强度等级和顺序进行了判别,并据此提出了相关建议,以减小该矿深部开采岩爆灾害的发生。     

某深竖井围岩岩爆倾向性预测研究

为评估某深竖井目前施工段围岩岩爆烈度等级,基于AHP-FUZZY理论方法并结合现场施工实际,综合考虑现有理论判据和岩爆发生机理,选取脆性系数、弹性能指数等8个评价指标预测岩爆等级,结果表明其竖井围岩无岩爆倾向性。同时结合损伤理论从岩体强度、储能能力、劣化程度等方面解释了其倾向性,其结果可为竖井现场施工和支护设计提供参考价值。     

玲珑金矿深部开采岩爆倾向性评价

根据室内岩石力学试验结果来评价岩爆的倾向性,是一种既有效又经济的方法。通过对玲珑金矿深部岩石进行单轴压缩试验、巴西劈裂试验、单轴循环加载试验和单轴与三轴刚性试验,采用脆性系数法、弹性变形能指数法、线弹性能法和冲击能量指数法评价了玲珑金矿深部开采岩爆倾向性。结果表明,该金矿深部开采具有强岩爆倾向性。     

大红山铁矿深井大规模开采岩爆综合评价

大红山铁矿是特大型深埋矿床,在深井开采时遇到的一个技术难题就是岩爆。为评价岩爆倾向性烈度,对该矿深部5种岩样进行室内岩爆倾向性试验,并采用声发射方法确定岩石接近峰值强度时的卸载点;通过地应力现场实测和三维有限元数值模拟,获得深部最大主应力和巷道开挖后最大切向应力;采用最大主应力判别法、切向应力准则、强度脆性系数法、变形脆性系数法、弹性应变能储存指数法这5种评价方法,对岩样的岩爆倾向性进行单项指标评价,分别得到各矿岩岩爆倾向性烈度。然后采用模糊数学法,对各单项指标评价结果进行综合评价。结果表明:深部主要矿岩体总体上具有发生中等岩爆和强烈岩爆的倾向性。最后,通过评价结果,在岩层图上绘制典型水平岩爆倾向性分布区域,可为深部开采和岩爆防治提供参考依据。     

基于权重融合的多维云模型岩爆预测研究

岩爆是地下空间开发和矿业工程中主要工程地质灾害之一,岩爆倾向性预测是必须解决的岩石工程的重大问题。针对岩爆预测过程中多因素综合影响的特点,采用云雾化理论对权重融合的合理性进行检验,获得检验通过的综合权重,采用多维云模型岩爆预测方法,生成综合多种指标的等级综合云。最后,通过若干组国内外典型岩爆实例验证模型的可靠性和实用性,并与CRITIC-云模型、熵权-云模型和RS-TOPSIS模型对比,结果表明:基于云模型理论的权重融合方法能获得更为合理的综合权重,多维云模型应用于岩爆倾向性预测是有效的,可以直观、快速有效地判定岩爆烈度分级。     

岩爆危险性评价的变权物元可拓模型

为客观评价岩爆危险性,将物元理论与变权理论结合,构建了变权物元评价模型。首先,对指标数据规则化处理,解决传统物元模型自身局限性;其次,基于变权理论确定评判指标权重,避免评价过程中的主观性,同时使得被评价对象主动参与综合评判;第三,以非对称贴近度代替传统模型中的最大隶属度;最后,通过物元等级变量特征值的计算结果对样本等级进行评定,以权重及特征值对指标的敏感性确定影响评价结果的关键性指标。以甲玛矿为例,计算结果显示该矿为弱岩爆等级,且偏向于无岩爆,与现场实际情况吻合,与已有评判结果基本一致;倾向性指数、应力指数为敏感性指标,应力系数为一般敏感性指标。     

东海煤矿深部岩爆倾向性评价

在矿井深部开采过程中,遇到的主要地压灾害之一是岩爆。通过岩石力学性质试验结果来评价岩爆的倾向性,是一种既有效又经济的方法。利用RMT-150B岩石力学实验系统对东海煤矿深部的岩石进行了单轴抗压强度、抗拉强度、应力—应变测试用脆性系数(R法和Ku法)、能量判据法、动态(DT)法等方法评价了东海煤矿深部岩石的岩爆倾向性。实验结果表明,该矿岩石均具有明显的岩爆倾向性。     

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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