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工程爆破施工过程中如何控制其对周围建筑物、正在施工项目和处于养护龄期内的混凝土结构的影响一直是爆破施工中的实际问题,直接关系爆破施工的单响药量和施工进度。隧道爆破掘进施工中为了追求施工进度,往往在爆破方案中使用较大的单响装药量,从而忽略了大药量爆破产生的冲击波效应对隧道岩壁、已有结构的破坏,本文简单介绍了施工前或施工中,进行质点振动速度监测的实际应用。 相似文献
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运用爆破振动测试与混凝土声波检测相结合的方法,对汤渡河水库大坝混凝土拆除爆破进行了有效的控制,在保证大坝安全的前提下,大大加快了施工进度,是一种行之有效的方法,对同类工程有较大的借鉴作用。 相似文献
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Kai Liu Wancheng Zhu Qingyuan Wang Xiaobo Liu Xige Liu 《Geotechnical and Geological Engineering》2017,35(1):225-241
In order to smooth ore production during the transition from open pit to underground mining at Yanqianshan Iron Mine, China, it is necessary to select an appropriate mining method to operate simultaneously open-pit mining and underground mining for inner-slope (hanging-wall) ore-body. Based on practical geologic setting of the hanging-wall ore-body, a comprehensive evaluation model for selecting the underground mining method to extract handing-wall ore-body was proposed, which is constituted by 3 sub-systems of safety factors, production factors and technical–economic factors. This evaluation model could be analyzed by the mutation progression method, which based on catastrophe theory and fuzzy mathematics. In addition, the FLAC3D is employed to simulate the mining process of hanging-wall ore-body, and finally the optimal mining scheme is determined. By using mutation progression analysis and numerical modeling, some useful conclusions for hanging-wall ore-body mining have been drawn, which will be beneficial to mining safety during transitional period from open-pit to underground mining. 相似文献
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叶里克一带位于慕士塔格–阿克赛钦Fe-Cu-Au-Pb-Zn-白云母-宝玉石成矿带及新疆西昆仑塔什库尔干铁矿勘查区中部,成矿地质条件优越.中国国土资源航遥中心在赞坎-苏巴什一带完成1∶5万航磁勘查,于叶里克一带圈出10个1∶5万和1个1∶100万航磁异常,结合1∶1万地面高精度磁法及1∶1万磁法剖面测量,发现4处铁矿床,表明该区航磁异常和地面磁异常由磁铁矿体引起.采用航磁大面积选区,地面磁法进行验证,在叶里克一带找铁矿效果显著. 相似文献
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C. Valdivia M. Vega C. R. Scherpenisse W. R. Adamson 《Fragblast: International Journal for Blasting and Fragmentation》2003,7(2):63-78
Vibrations due to production blasting can induce damage to the rock mass at large distances by altering larger geological structures, fault areas or other structures, where the orientation with respect to the mine geometry is unfavorable and can cause displacement of large rock volumes. Past occurrences of this nature in Escondida Mine placed geomechanical safety restrictions as to maximum allowable blast size in the northeast area of the mine. These restrictions limited the efficiency of drilling and blasting operations seriously limiting daily production. This is what prompted this study to attempt to increase shot size while reducing stability problems. This would permit keeping stable the slope over which the ore extraction belts are located, as well as the main access ramp to the mine. Using a rigorous and systematic instrumentation and monitoring effort of blasting vibrations at multiple locations with respect to an unstable location allowed the development of a database to establish acceptable vibrations limits. A parallel effort was the development and gauging of a mechanistic model for the prediction and simulation of blasting vibrations. Excellent results were obtained from a comparison between the measured and predicted results. This allowed the use of the gauged model to verify the practicality of increasing the shot size in the restricted blasting zones, without exceeding safe vibration limits. The practical success achieved using this research approach resulted in increased blasting size, with a consequent increase of blasted material per shot, and contributed to more flexible mining operations. 相似文献
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我国每年铁矿石供应缺口较大,并在逐年扩大,认真抓好现有矿山,充分利用现有铁矿资源,减少缺口,已势在必行。文章结合冶口 铁矿实际,提出有关措施,继续对矿山优惠政策,并鼓励矿山充分利用资源,加强矿山技术改造,坚持采矿与找矿并重,努力提高矿石的开采回收率,减少损失率,降低 相似文献
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攀枝花兰尖铁矿兰营采场边坡泥化夹层的成因探讨 总被引:3,自引:0,他引:3
介绍了攀枝花兰尖铁矿兰营采场边坡中泥化夹层的地质特征、矿物成份和化学成份。根据矿物成份对泥化夹层成因进行了分析,根据化学成份运用巴尔特岩石计算法分析了泥化夹层的成因,为兰营边坡稳定性分析提供了依据。 相似文献
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针对马鞍山钢铁矿业有限责任公司姑山铁矿疏干巷道水量大的实际情况,提出用注浆法截水的可行方案。经施工验证,达到预期的目的。介绍了截水方案设计、施工工艺及截水效果。 相似文献
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为了解沉积变质型铁矿床开采后矿区地下水化学特征的变化趋势,在充分掌握矿区含水系统划分和流动系统发育规律的基础上,通过对四含上、四含下、基岩含水层148个水样常规离子的相关性、水化学类型及公因子的分析,得出水化学类型分区和公因子得分等值线,将二者叠加,分析各含水层潜在的形成作用及其控制因素.研究结果表明,四含上以碳酸盐溶滤、污染、氧化作用为主;四含下以污染、溶滤、局部脱硫酸作用为主;基岩含水层以离子交换吸附、第四系水的混合、硅酸盐矿物的不全等溶解作用为主.除了背景因素外,矿山开采后的三维流场控制了基岩含水层的形成作用和原生水化学类型,影响了第四系含水层的局部形成作用,水化学类型分区界线明显移动. 相似文献
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El Teniente Mine has developed the method of panel caving as an innovative pre-conditioning caving alternative for traditional mining of sectors located in primary rock. In applying this method, caving speed and area incorporation are the most relevant parameters to establish a desired production level in a specified sector. This is the context in which continuous improvements to several design alternatives have been developed and applied to optimize mine caving. Mine caving, by drilling and blasting, results in a narrow base cut of ore columns not larger than the height of the caving galleries, which usually measure 3.6 m. These confined blasting operations require drilling parallel blastholes that extend from the floor to the roof of the caving gallery. Panel caving aims at mitigating subvertical field stress transmission to the lower levels of the caving gallery. This improves the stability and helps maintain the advancement of the caved zone at the caving level, with respect to the development, preparation and ore mining activities in the production level. This paper analyzes and evaluates different panel caving alternatives. The result is the identification of the most adequate panel caving alternative for conditions in the Esmeralda Mine given safety, technical, operational and economic considerations. 相似文献
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大冶铁矿大采空区动力稳定性研究 总被引:1,自引:0,他引:1
针对大冶铁矿尖林山1~#矿体大采空区(顶板水平暴露面积6434平方米,高45米)的特点,进行地质调查、振动测量、岩石力学试验、三维空间边界元分析及光弹性试验、动力模型试验。各项资料经综合研究后得出的结论是:该采空区基木稳定,在监测和限制爆破作业条件下,可以不放顶进行强采。现大冶铁矿尖林山1~#矿体已全部安全强采完毕,采终后大采空区空间尺寸为:长200米、宽78米、高73米,顶板水平最大暴露面积达9850平方米,该大采空区仍基本稳定。实践证明,本研究所作出的结论是正确的,它已取得显著的经济效益,它是岩石动力学应用于工程的一个典例,对于类似矿山的大采空区稳定性评价有借鉴意义。 相似文献
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In view of the characteristics of the large goaf of jianlin hill, Daye iron mine (with horizontal exposed area of the roof being 6434m2 , and the height being 45m) , are conducted the geological investigation, vibration measurement, geomechanical tests, 3-dimensional BEM analysis, photoelastical tests and dynamics model tests. The comprehensive studies gave the conclusion that the goaf is basically stable and can undergo mining under the condition of monitoring and restriction of blasting jobs. At the present the mining in No.1 ore body has been finished and the large goaf still remains basically stable with it length of 200m, width of 78m and height of 73m, and the maximum horizontal exposed area of 9850m2. The conclusion proved to be correct and had led to an apparent economical affects. It is a typical example of the application of rock dynamics in the engineering and have significance for appraisal of the stability of the large goaf in similar mines. 相似文献