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1.
自然崩落法采矿过程中,顶板冒落规律掌握、底部结构稳定性情况、地表沉降趋势监测及控制等,不仅关系开采过程人员和财产安全问题,更是决定自然崩落法能否成功用于普朗铜矿的关键。采用微震、三维激光扫描、TDR、钻孔电视、应力位移等技术,综合对普朗铜矿顶板冒落规律、底部结构变化情况、地表沉降实时显现进行在线监测,并通过统一平台对数据进行综合联动展示和分析。该综合在线监测技术应用,控制了崩落面和松散矿堆之间的高度,避免上覆矿岩大范围崩落产生空气冲击气浪;优化了拉底推进与底部结构开口之间的空间位置关系;解决了底部结构矿柱二次加强支护时机及措施选取问题;实现了地表稳定均匀沉降。综合在线监测技术在普朗铜矿得到很好应用。  相似文献   

2.
黄山铜镍矿30#矿体开采过程中存在采空区与32#矿体采空区贯通并塌至地表的安全隐患。为掌握30#矿体开采过程中采空区顶板冒落规律,基于微震监测技术,进行台网布置优化和波速校正,形成符合该矿山实际需求的在线监测系统。分析微震事件时空演化规律,观察微震事件异常变化,圈定微震事件空间分布范围,得出顶板冒落规律。微震事件有向32#塌陷区不断发展的趋势,现场显现与观测结果相一致,为后续隐患治理提供基础。  相似文献   

3.
为更好地研究自然崩落法开采过程中断层活化及顶板冒落规律,并在顶板发生大范围崩落前进行有效预警,利用微震监测技术对岩体活动进行监测。发现大部分微震事件发生在断层附近,且生产过程中主要断层附近岩体破裂较为严重。基于微震监测数据分析得出顶板大范围崩落前兆信息,提出衡量岩体内部损伤程度的能量指数与累积视体积之比EV值,并基于归一化处理量化EV值下降程度,成功对现场顶板冒落进行了预警。  相似文献   

4.
黄山铜镍矿30~#矿体开采过程中,上覆采空区顶板易大范围冒落并贯通地表。为掌握地表开裂及上覆采空区顶板冒落规律,建立并优化微震监测系统对其进行有效监测。分析可知,2019年5—6月地表附近微震事件出现3次突增现象,顶板破裂范围逐渐减少。微震事件有向32~#塌陷区及其东部发展趋势,地表与顶板之间有逐渐贯通趋势。基于微震事件分析地表岩体应力特征,为矿山的安全生产提供了技术保障。  相似文献   

5.
普朗铜矿自然崩落法开采会引发顶板崩落及地表沉降,地表均匀稳定的沉降尤为关键,因此实时掌握地表沉降规律是非常重要的。本文利用三维激光扫描技术,对普朗铜矿地表沉降的动态变化情况进行实时监测。通过实时监测,得出了重点监测区域的平均沉降速度,为底部结构放矿参数的优化提供了依据。三维激光扫描技术在该矿实时监测地表沉降规律中得到了很好的应用,具有较好的推广应用价值。  相似文献   

6.
深部开采围岩失稳模式分析   总被引:1,自引:0,他引:1  
阐述了云南驰宏锌锗股份有限公司会泽铅锌矿的基本地质条件,对深部围岩进行了RMR分级.通过现场调查,发现深部开采围岩失稳冒落模式有"倒三角"顶板冒落模式、"缓倾斜顶板岩层"冒落模式、"单断层"影响顶板冒落模式、"双断层"耦合响应的顶板冒落模式和"上盘开裂"地应力响应的顶板冒落模式.该成果为建立微震监测系统提供了基本资料,同时为选择合理的采矿方法和地压控制技术措施提供了重要依据.  相似文献   

7.
张海明  董山 《金属矿山》2011,40(6):16-19
三山岛金矿直属矿区进入深部开采时出现岩爆现象,同时生产区域存在由于岩爆诱发的矿柱失稳和顶板冒落的危险,需要进行监测和预警。基于适合监测深部金矿安全开采的微震监测系统检测结果,研究基于微震监测的深部岩爆预警技术思路,分别研究了岩爆危险区域的预报、微震监测划分采场安全等级、断层突水的微震监测等内容。通过研究达到全面监控目标区域的岩石稳定状况和动态,实现了深部开采的监测和预警。  相似文献   

8.
通过对国内外采空区稳定性地压监测评估方法现状分析,综合考虑微震事件的能量-空间-时间分布特征及多种监测技术手段,提出了微震事件时空演化规律、微震能量指数与累积视体积之比EV、微震b值、多参数融合等4种采空区稳定性评估方法。然后,在普朗铜矿、亚克斯矿、寿王坟矿等矿应用了这些方法,分析这些采空区影响下顶板、地表、巷道围岩破裂发展的发育演变规律,与现场实际相契合,验证了这些方法的有效性。  相似文献   

9.
随着采深增大,某矿山地压问题逐渐凸显,开采中出现顶板冒落、矿柱片帮等岩体动力灾害,同时存在周边矿山越界开采活动,不明采掘作业影响矿岩结构系统稳定性。为此矿山建立了一套微震监测系统,通过数据处理辨别并定位微震与爆破事件。以某时段监测数据为基础,总结了岩体破裂活动时空活动规律,分析了采区围岩的应力分布特征,掌握了越界开采作业时间与位置,本监测分析方法可在今后矿山地压管控中应用与推广。  相似文献   

10.
某金矿在深部开采过程中,频繁出现顶板冒落、矿柱片帮、岩爆等地压灾害,并存在民采活动扰乱矿山正常生产秩序。通过台网分析及波速校正,设计并建设了满足矿山安全监测的微震监测系统。运用微震监测数据高精度定位震源,分析了定位事件的时空演化规律,评估了监测范围内岩体稳定性,同时定位得到了民采活动区域,为矿山安全生产提供了保障。  相似文献   

11.
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  相似文献   

12.
<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  相似文献   

13.
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  相似文献   

14.
<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  相似文献   

15.
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  相似文献   

16.
文奇 《中州煤炭》2018,(6):175-178
高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。  相似文献   

17.
<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  相似文献   

18.
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.  相似文献   

19.
<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  相似文献   

20.
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.  相似文献   

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