共查询到19条相似文献,搜索用时 234 毫秒
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淮南矿业集团公司潘一矿为大型生产老矿井,为了提高年产量,经专家研究实行可行性方案,建设第二副井工作的难度主要是新建第二副井位置距离主井、风井和副井三井较近.新建第二副井前期施工采取冻结和地面预注浆,施工前期因注浆压力过大造成主井井壁破坏,从而对改扩建矿井工广地面预注浆方案和注浆参数进行重新修改.最终第二副井地面预注浆顺利完工. 相似文献
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水口山铅锌矿鸭公塘矿区大型帷幕注浆治水工程技术的应用 总被引:1,自引:0,他引:1
阐述了水口山铅锌矿帷幕注浆治水技术的应用,包括无线电波探测技术、钻孔定向导斜钻进技术、地面与井下联合注浆方案、自流注浆方式和孔内爆破等。 相似文献
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岩溶大水矿山改性粘土帷幕注浆水害控制技术研究项目科技成果通过鉴定2008年5月8日,由长沙矿山研究院和新桥矿业有限公司共同完成的岩溶大水矿山改性粘土帷幕注浆水害控制技术研究项目通过了中国有色金属工业协会组织的科技成果鉴定。该项目针对岩溶大水矿山情况,研制并成功应用了廉价的改性粘土注浆材料,开发了高速高效输料粉碎制浆系统,采用超声波CT、地质分析及数值模拟技术优化帷幕设计,指导帷幕注浆施工,堵水率达77.96%,取得了显著的防治水效果。 相似文献
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谷家台矿区采用井下矿体顶板灰岩注浆堵水方案,堵水效果良好,完全达到采矿生产的要求;同时避免了全面预先疏干法和地面垂直帷幕注浆堵水法引起的地面塌陷,居家搬迁,嘶马河改道第一系列问题。 相似文献
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在大水矿山建设中,通过采用单排环形全封闭帷幕注浆工艺,可有效减少地下水向矿区的涌入,实现帷幕堵水率 80%;通过地下水回灌工艺,将矿坑疏干水处理后的多余部分回注矿区外奥陶系含水层,可调节地下水资源,防止地下含水层枯竭。帷幕注浆与地下水回灌工艺的综合运用,可以有效保护地下水资源,保持生态环境平衡,同时促进矿山建设和生产,提升生产效率。 相似文献
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介绍了防渗帷幕灌浆工艺的支护机理 ,及在某矿软粘土质岩石巷道掘进中应用的施工方法、技术方案、工程效果 ,对类似岩性的井巷掘进具有参考价值。 相似文献
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根据石硐沟银多金属矿深部开采时主斜坡道掘进遇松软破碎带时的支护情况,通过对围岩物理力学特性研究,及原有管棚钢架支护破坏机理分析,提出了适用于该矿的钢管帷幕法前探支护+36U型钢+壁后注浆的支护方案,并进行了现场实践,取得了预期效果。 相似文献
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Inertial and buoyancy driven water flows under gas bubbling and thermal stratification conditions in a tundish model 总被引:5,自引:0,他引:5
A. Vargas-Zamora J. Palafox-Ramos R. D. Morales M. Díaz-Cruz J. de J. Barreto-Sandoval 《Metallurgical and Materials Transactions B》2004,35(2):247-257
Steel flow dominated by inertial and buoyancy flows under gas bubbling and thermal stratification conditions, in a one-strand
tundish, was studied using a 2/5 scale water model. The use of a turbulence inhibitor yields plug flow volume fractions well
above 40 pct for a casting rate of 3.12 tons/min under isothermal conditions. Small flow rates of gas injection (246 cm3/min), through a gas curtain, improved the fluid flow by enhancing the plug flow volume fraction. Higher flow rates originated
an increase of back-mixing flow, thus forming recirculating flows in both sides of this curtain. Step inputs of hot water
drove streams of this fluid toward the bath surface due to buoyancy forces. A rise in gas flow rate led to a thermal homogenization
in two separated cells of flow located at each side of the gas curtain. Step inputs of cold water drove streams of fluid along
the tundish bottom. Use of the gas curtain homogenized the lower part of the tundish as well as the upper part of the bath
at the left side of the curtain. However, temperature at the top corner of the tundish, in the outlet box, remained very different
than the rest of the temperatures inside this tundish. High gas flow rates (912 cm3/min) were required to homogenize the bath after times as long as twice the mean residence time of the fluid. Particle image
velocimetry (PIV) measurements corroborated the formation of recirculating flows at both sides of the gas curtain. 相似文献
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Experimental Study on Selective Withdrawal in a Two-Layer Reservoir Using a Temperature-Control Curtain 总被引:1,自引:0,他引:1
An experimental study was conducted to investigate the use of a temperature-control curtain in selective withdrawal from a two-layer stratified reservoir. This study focused on the case where cool water at a depth was forced to flow under the curtain. The evolution of the mean flow, the withdrawal water quality, and the mean velocity field were studied using particle image velocimetry and laser-induced fluorescence. Practical relationships were developed for predicting the withdrawal water quality and the interface height as a function of time. The structures of the flow field in both the upper and lower layers are discussed in detail. The flow in the lower layer was dominated by the recirculation eddy induced by the jet flow under the curtain and a relation between the eddy length and the interface height was obtained. Close to the intake, within about 3d (where d = intake diameter), the velocity field can be well described by the potential flow theory. Beyond 3d, however, the flow field considerably deviated from the potential flow theory due to the jet expansion and stratification. A general discussion of the results and engineering applications are also provided. 相似文献