深井井底车场高地应力硐室群稳定性分析

针对淮南朱集煤矿井底车场中央水泵房这一深埋大断面大规模高地应力松软围岩硐室群的长期稳定性问题,通过数值模拟研究了水泵房开挖、支护后围岩变形和应力场分布特征,采用振弦式混凝土应变计、钢筋应力计、压力盒监测水泵房二次衬砌,获取了二次衬砌混凝土应变、钢筋应力、二次衬砌所受压力的演化规律,分析评价了水泵房围岩稳定性和钢筋混凝土二次衬砌受力状态及其稳定性。数值模拟结果与现场监测结果吻合较好,研究结果表明：一次支护和二次衬砌支护后,泵房围岩变形收敛稳定,二次衬砌受力状态良好,所受最大围岩压力为62．5MPa,安全可靠,钢筋应力值、混凝土应变均未超过强度值。     

矿井深部软岩大断面硐室二次支护技术的研究与应用

本文根据软岩工程支护的岩石力学原理,正确分析了曹庄煤矿深部软岩大断面硐室的围岩变形机理,根据支架与围岩共同作用原理以及硐室围岩变形与时间的关系,合理进行支护设计,提出了适时锚喷二次支护作为控制硐室围岩变形的方法,合理确定硐室二次支护时间,取得了良好的控制效果和经济效益。     

深部软岩硐室二次支护技术研究

孔庄煤矿-1 015 m爆炸材料发放岩硐室埋深约1 050 m,硐室围岩以砂质泥岩为主,硐室若失稳将对整个采区的爆炸材料管理造成重大隐患。基于此为硐室提出了二次锚网索支护设想。在研究二次支护的时机、二次支护锚杆(索)变形匹配、二次支护混凝土喷厚的基础上,提出了硐室二次支护技术方案。方案实施后,围岩监测结果表明,硐室围岩变形量较小,围岩变形得到有效控制。     

大断面注浆硐室围岩稳定性分析及控制技术

为解决大断面注浆硐室围岩稳定性控制难题,采用FLAC3D软件对硐室围岩变形破坏特征进行了模拟分析。数值模拟结果表明硐室围岩变形控制的关键部位为硐室顶底板的边角部位和硐壁中部。硐室开挖采用"溜井出渣、分层开挖、及时支护"的思路,尽量减小开挖扰动对围岩的破坏。硐顶与硐壁支护方法为"锚网索喷"联合支护,临时"初喷"支护及时封闭围岩,二次"锚网索喷"支护充分调动了围岩的自承载能力。硐底部分采用锚索和钢筋混凝土衬砌支护,避免硐底边角部位产生剪切破坏。监测结果表明支护结构能够较好地满足了硐室长期稳定性和防渗要求。     

深部软弱地层大断面箕斗装载硐室稳定监控分析

主井箕斗装载硐室处于矿井的咽喉部位,设计断面大、受力复杂、服务于矿井全周期,箕斗装载硐室是否稳定直接影响着整个煤矿的生产运营.采用ANSYS建立箕斗装载硐室的三维地质力学模型,基于FLAC3D模拟分析开挖与支护条件下箕斗装载硐室围岩位移场和塑性区的演化规律,确定锚杆(索)合理的间排距.基于新奥法思想,采用锚杆(索)测力计、压力盒和钢筋计等传感器对深部特大型箕斗装载硐室支护结构的受力状态进行动态监测,初步揭示锚杆(索)轴力、围岩压力(初期支护与二衬间的接触应力)、二衬钢筋受力随时间的演化规律,分析支护结构的工作状态和发展规律,评价现有支护技术方案的支护效果,为进一步优化支护设计奠定基础.监测结果表明,支护结构的受力数值均在安全范围内,尤其是钢筋混凝土衬砌结构的受力状态良好,结构安全可靠,起到了安全承载储备作用;所采用的"锚网索喷初次支护+钢筋混凝土衬砌二次支护"联合支护技术方案,保证了深埋大断面硐室的稳定及使用安全.     

大断面硐室二次高强锚网支护应用研究

为控制大断面硐室围岩变形,针对一次支护出现的问题,提出二次高强锚网支护,通过对二次支护效果的数值模拟,硐室表面围岩变形控制在100mm左右,下降幅度达到70%。通过二次锚网加固的的围岩位移观测可知:采用新型支护技术后,巷道的两帮位移速度在60d左右围岩变形基本处于稳定,围岩变形不大,满足硐室的使用需求。     

大断面硐室二次高强锚网支护技术研究

为控制大断面硐室围岩变形,针对一次支护出现的问题,提出二次高强锚网支护,通过对二次支护效果的数值模拟,硐室表面围岩变形控制在100 mm左右,下降幅度达到70%。通过二次锚网加固的的围岩位移观测可知:采用新型支护技术后,巷道的两帮位移速度在60天左右基本处于稳定,围岩变形不大,满足硐室的使用需求。     

深部高应力立井连接硐室群围岩稳定控制与支护技术

针对深部高应力立井连接硐室群围岩稳定控制和支护中出现的问题,通过硐室围岩调查取样并进行室内物理力学试验,基于Hoek-Brown强度准则选取了深立井硐室群围岩计算参数,利用GTS对硐室群开挖过程中围岩位移场和应力场分别进行了数值模拟分析,提出优化的支护设计方案。通过围岩表面收敛监测,确定了围岩滞后注浆的最佳时间,围岩变形和支护结构受力的实测验证了支护的可行性,满足了生产需要。     

井底大断面关键永久硐室围岩变形机理及其控制技术

为解决井底大断面换装硐室一次支护围岩大变形问题,基于成庄煤矿大断面硐室围岩地质力学条件和变形特征,采用理论分析、数值模拟和现场试验的方法从大断面硐室围岩应力分布特点和支护承载结构稳定性两方面分析了大断面硐室围岩变形破坏的原因,并针对硐室围岩变形破坏的特征及其控制要求,研究提出在注浆原位加固提高原有锚网支护与围岩共同形成的支护承载结构完整性和强度的基础上,进一步采用全长预应力锚固强力锚索增强支护承载结构的稳定性的技术方案,对成庄矿井底大断面关键永久硐室进行二次加固。试验结果表明,巷道围岩变形量为8mm,底鼓为13mm,有效控制了硐室围岩的大变形。     

深部大断面硐室围岩控制技术

针对某矿架空乘人装置人车深部大断面硐室围岩控制难度大的问题,提出了二次全断面支护方法,基于FLAC2D数值模拟得出了二次支护在变形剧烈阶段到变形平缓阶段的拐点进行为宜,锚网支护中锚杆(索)预紧力应合理匹配,对架空乘人装置人车硐室实施二次全断面支护后,硐室围岩变形量小,围岩变形得到有效控制。     

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 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.