斜井月成井331.3米的快速掘进经验

这是煤炭系统斜井快速掘进的先进经验,今年五月他们创造了斜井独头掘进月成井364.5米的新纪录,超过了斜井掘进的世界最高成井纪录。我们要认真学习他们的革命精神和施工经验。     

2DPZ-15 电耙在斜井上山掘进中的应用

通过论述2DPZ-15 电耙在金属矿山斜井上山掘进施工工艺的中的应用情况,总结出2DPZ-15 电耙引入到斜井掘进施工工艺的特点和注意事项,该施工工艺对加快斜井上山施工速度,减轻人工劳动强度,优化改进斜井的施工工艺起到一定的促进作用,同时也给金属矿山其他工程施工提供借鉴意义。     

斜井多中段联合反掘高精度贯通技术的研究与实践

矿山地质环境中斜井如何进行掘进和施工,以及对于斜井内的变形控制是矿井建设领域中的重要研究方向。在斜井巷道开挖时,采用支护等技术,更会使围岩与矿井产生一定的相互作用。基于此,本文以斜井多中段联合反掘高精度贯通技术的研究与实践为研究对象,对富斜井支护设计、施工掘进方案进行了研究。     

斜井多中段联合反掘高精度贯通技术的研究与实践

矿山地质环境中斜井如何进行掘进和施工,以及对于斜井内的变形控制是矿井建设领域中的重要研究方向。在斜井巷道开挖时,采用支护等技术,更会使围岩与矿井产生一定的相互作用。基于此,本文以斜井多中段联合反掘高精度贯通技术的研究与实践为研究对象,对富斜井支护设计、施工掘进方案进行了研究。     

斜井快速施工与防治水

本总结山西大宁煤矿主斜井采用先进的斜井施工机械化作业线，科学治水，合理组织劳动，实现快速掘进，取得工程进度快、质量优的效果。     

云南斗南锰矿小断面斜井施工腰线标定新方法

主要简述云南斗南锰矿井下斜井施工过程中,利用高程控制小断面斜井的施工方法,比用伪倾角法控制的施工方法节省2 d时间,掘进速度快90 m,为公司新增收益270 000元。     

近十年来我国有色矿山井巷掘进机械化的情况及发展设想

本文简述了我国有色矿山井巷掘进机械化的重要意义。论述了近十年来我国有色矿山在竖井、平巷、天井、斜井及斜坡道掘进机械化方面所取得的主要成就。指出当前有色矿山井巷掘进机械化存在的主要问题,并就我国有色矿山井巷掘进机械化的发展提出了设想及建议。     

关塘铁矿斜井井筒施工中流沙及涌水的防治

关塘铁矿提升斜井原预计涌水量小于34m^3／h，斜井要穿越较厚的第四系冲积层和流沙层。在井筒掘进过程中，关塘铁矿遭遇了几次特大涌水和流沙等危害，通过采用注浆堵涌及挤压注浆固沙相结合的方案，解决了上部井筒渗水、淋水现象，井筒最终出水量小于10m^3／h，保证了井筒安全穿越软土含水层和流沙层的掘进施工．     

某钨钼多金属矿千米长斜井快速施工

快速施工技术是矿山快速建设的技术保障。某钨钼多金属矿新建胶带运输斜井基岩段长933.1 m,掘进断面面积12.97 m~2,属于大断面长斜井。文章对该长斜井快速施工技术进行研究,断面开挖拟采取导洞超前开挖,光面爆破后续跟进,即"两小一大"交替作业方式。通过CY-2型井下铲运机与小汽车搭配,实现出碴无轨运输。施工组织采用"四六工作制",取得最高月进121.5 m的好成绩,实现了斜井安全高效、优质快速施工,经济效益与社会效益明显。     

激光指向在井巷施工测量中的应用

矿山井巷施工中,测量是一项很重要的工作,竖井掘进需要有井筒中心线,平巷、斜井掘进需要有中线和腰线,才能保证井巷施工的质量符合设计要求。二十三冶矿山井巷公司(原湖南冶金井巷公司)从75年开始就采用了激光指向这一新技     

某铁矿开拓方案探讨

某铁矿原为露天开采,露采结束后,深部存在隐伏矿体,矿体倾角较大,向下延深较深,为开采该部分矿石,结合现阶段的环境,采用胶带斜井开拓或箕斗竖井开拓哪个更合适？本公司在多方面考虑,并经过多专业人员合作,将两个开拓方案进行比较,并最终确定了合理的开拓方案。     

多级倒段反斜井矿仓连接技术在板溪锑矿的应用

板溪锑矿在深部开拓系统中,采用多级倒段反斜井提升,斜井之间采用多级倒段反斜井＋溜井＋矿仓连接技术。这种连接技术具有系统简单、无需转运工具和设备等特点。详细介绍了板溪锑矿开拓系统及多级倒段反斜井矿仓连接技术。该技术经多年的生产实践表明,投资与平行斜井相比节约200万元,每年可节约提升运输费用78万元,而且斜井箕斗运行安全可靠。     

水泵泵轴磨损再修复技术研究

根据水泵泵轴磨损的几类缺陷情况，提出了修复磨损零件的３种工艺方法并进行了比较。说明了修复工作的重要性。     

油泵齿轮轴精锻成形工艺研究及缺陷分析

针对油泵齿轮轴特殊形状设计了齿轮轴精锻模具.通过有限元仿真和精锻实验研究了齿轮轴成形过程和金属流动规律.分析了对油泵齿轮轴精锻工艺中产生齿形角隅填充不满缺陷的原因:角隅填充是成形终了时成形载荷陡增的主要原因之一,由于齿轮轴精锻模具结构的特殊性,其强度无法满足齿形角隅填充所需高成形载荷的需要.基于角隅填充状况,提出了齿形端面斜面分流和环形槽分流,并对传统精锻工艺和两种分流锻造工艺进行了有限元仿真.分析结果表明两种分流方法均能有效减小齿形角隅填充时金属流动阻力,保证齿形良好填充,降低成形载荷,并且斜面分流优于环形槽分流.锻造实验验证了有限元仿真的准确性.      

Enkephalinergic nerve terminals target inhibitory interneurons in the rat hippocampus

Using correlated light and electron microscopic preembedding enkephalin immunocytochemistry combined with post-embedding GABA immunogold staining, we found morphological evidence of a direct connection between the enkephalinergic and GABAergic systems in the rat hippocampus. Enkephalin-immunoreactive boutons were found to be presynaptic to GABA-immunoreactive postsynaptic profiles, establishing type 2 symmetrical synapses on GABA-positive cell bodies and dendritic shafts in strata radiatum and lacunosum moleculare of the CA1 region. Thirty-six percent of all studied postsynaptic targets (n = 40) were non-pyramidal, including all somatic (n = 7) and 47% of the dendritic (n = 13) postsynaptic targets. The remaining 64% consisted of pyramidal dendritic shafts and spines. These results support previous physiological experiments suggesting that the opioidergic system takes part in disinhibitory processes in the hippocampal formation.     

楔横轧成形25CrMo4厚壁空心轴件的不圆度分析

机械结构轻量化的主要途径是在结构上采用空心轴.近年来, 采用楔横轧带芯棒轧制空心轴类件的工艺得到了较广泛的关注.厚壁空心轴类件在楔横轧轧制过程中易发生“失圆”现象.本文通过热压缩实验研究了25CrMo4合金钢在楔横轧变形条件下热变形行为, 获得其真应力-应变曲线.在此基础上, 基于Deform-3D有限元软件, 建立25CrMo4厚壁空心轴楔横轧有限元仿真模型, 分析厚壁空心轴楔横轧成形机理, 研究得出断面收缩率、成形角、展宽角对轧件不圆度的影响规律: 断面收缩率增大, 不圆度减小; 成形角增大不圆度减小, 轧制温度越高减小趋势越明显; 展宽角增大不圆度增大, 提高轧制温度抑制增大趋势.选取部分工艺参数进行楔横轧验证实验, 对比了有限元仿真结果和实验结果, 表明有限元仿真模型预测精度较高.      

Flexural Performance of Drilled Shafts with Minor Flaws in Stiff Clay

Lateral loads are often the primary forces that act on drilled shafts when they support retaining walls, bridge piers, or building foundations. The construction of drilled shafts often inadvertently introduces flaws that are not always detectable with well-performed nondestructive evaluation (NDE) techniques. The effect of such undetectable minor flaws on the lateral-load performance of drilled shafts needs to be assessed and subsequently considered in the design. This paper summarizes a field study that consisted of NDE of six, full-scale drilled shafts with preinstalled voids and lateral-load tests that were performed on the six test shafts. Results from the field study indicated that undetectable (by NDE) void flaws occupying areas of up to 15% of the cross-sectional area of the drilled shaft could reduce free-head shear capacity up to 16%. A subsequent numerical analysis was performed to filter out all variables, other than void flaws, that could affect the lateral-load deformation of drilled shafts. Numerical analysis results validated the field tests measurements. A parametric study of variables affecting the load-deformation behavior of drilled shafts suggests that a reduction in moment capacity of up to 27% is possible with undetected voids present in the shafts that were tested.     

Shear Load Transfer Characteristics of Drilled Shafts in Weathered Rocks

The load distribution and deformation of drilled shafts subjected to axial loads were evaluated by a load-transfer approach. The emphasis was on quantifying the load-transfer mechanism at the interface between the shafts and surrounding highly weathered rocks based on a numerical analysis and on small-scale tension load tests performed on nine instrumented piles. An analytical method that takes into account the soil coupling effect was developed using a modified Mindlin's point load solution. Based on the analysis, a single-modified hyperbolic model is proposed for the shear transfer function of drilled shafts in highly weathered rocks. Through comparisons with field case studies, it is found that the prediction by the present approach is in good agreement with the general trend observed by in situ measurements, and thus represents a significant improvement in the prediction of load deflections of drilled shafts.     

Capacity of Drilled Shafts in Burlington Limestone

Field load tests of three drilled shafts socketed in Burlington limestone were conducted using the Osterberg load cell. The objective of the testing was to compare the load capacities obtained from the field load tests with load capacities predicted using empirical methods. Based on the results of this study, the following conclusions can be drawn. The observed values of unit side resistance exceeded predicted empirical values for two of the three shafts tested (2,343 and 2,278 kPa observed versus 1,550 and 1,252 kPa predicted). However, for one of the shafts, the observed value of unit side resistance was only about ? of the more conservative predicted empirical value (916 kPa observed versus 1,252 predicted). Bearing capacity failure did not occur for two of the three shafts. Bearing capacity failure may have occurred for one of the shafts. Using a factor of safety of 3 applied to the lowest observed value of end bearing pressure implies that the allowable bearing capacity for the Burlington limestone at this site (3 MPa, or ?500 psi) exceeds the typical presumptive bearing capacity for sound limestone in mid-Missouri (1914 kPa or 277 psi).     

高炉斜桥的整体运输和吊装

采用合理的运输及吊装工艺，整体吊装运输１２８ｍ＾３高炉斜桥，在高炉建设施工过程中缩短了工期，降低了安装费用，保证了高炉建设顺利完成。