Mining engineering最新文献

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Standing support and rolled mesh for safe and efficient tailgate rib control 站立支持和滚动网的安全，有效的后挡板肋骨控制

Mining engineering

Pub Date : 2016-12-01 DOI: 10.19150/me.6421

T. Jones, J. Dubbert

This paper describes a rib-control methodology that uses standing support to provide most of the lateral resistance to the rib. The method is analyzed, and its boundary conditions for rib control a ...

本文描述了一种肋控制方法，该方法使用站立支撑来提供大部分肋侧阻力。对该方法进行了分析，并给出了控制肋部的边界条件。

引用次数: 1

Reducing float coal dust: Field evaluation of an inline auxiliary fan scrubber. 减少浮尘:在线辅助风机洗涤器的现场评价。

Mining engineering

Pub Date : 2016-12-01 DOI: 10.19150/me.6883

J. Patts, J. Colinet, S. Janisko, T. Barone, L. Patts

Controlling float coal dust in underground coal mines before dispersal into the general airstream can reduce the risk of mine explosions while potentially achieving a more effective and efficient use of rock dust. A prototype flooded-bed scrubber was evaluated for float coal dust control in the return of a continuous miner section. The scrubber was installed inline between the face ventilation tubing and an exhausting auxiliary fan. Airborne and deposited dust mass measurements were collected over three days at set distances from the fan exhaust to assess changes in float coal dust levels in the return due to operation of the scrubber. Mass-based measurements were collected on a per-cut basis and normalized on the basis of per ton mined by the continuous miner. The results show that average float coal dust levels measured under baseline conditions were reduced by more than 90 percent when operating the scrubber.

在地下煤矿浮尘进入一般气流之前进行控制，可以降低矿井爆炸的风险，同时也有可能实现岩尘的更有效和高效利用。在连续采煤段回采过程中，对原型水床洗涤器的浮尘治理效果进行了评价。洗涤器安装在工作面通风管和排气辅助风机之间。在三天内，在距离风机排气的固定距离处收集了空气和沉积粉尘质量的测量数据，以评估由于洗涤器运行而导致的回流中浮尘水平的变化。基于质量的测量是在每切割的基础上收集的，并根据连续矿工开采的每吨进行归一化。结果表明，在运行洗涤器后，在基准条件下测得的平均浮尘水平降低了90%以上。

引用次数: 3

Area monitoring and spot-checking for diesel particulate matter in an underground mine 某地下矿山柴油机颗粒物区域监测与抽查

Mining engineering

Pub Date : 2016-12-01 DOI: 10.19150/me.6882

S. Gaillard, E. Mccullough, E. Sarver

引用次数: 1

Defining hazard from the mine worker's perspective. 从矿工的角度定义危险。

Mining engineering

Pub Date : 2016-11-01 DOI: 10.19150/me.6832

B. Eiter, C. Kosmoski, Blaine P. Connor

In the recent past, the mining industry has witnessed a substantial increase in the numbers of fatalities occurring at metal and nonmetal mine sites, but it is unclear why this is occurring. One possible explanation is that workers struggle with identifying worksite hazards and accurately assessing the associated risk. The purpose of this research was to explore this possibility within the mining industry and to more fully understand stone, sand and gravel (SSG) mine workers' thoughts, understandings and perceptions of worksite hazards and risks. Eight mine workers were interviewed and asked to identify common hazards they come across when doing their jobs and to then discuss their perceptions of the risks associated with those identified hazards. The results of this exploratory study indicate the importance of workers' job-related experience as it applies to hazard identification and risk perception, particularly their knowledge of or familiarity with a task, whether or not they had personal control over that task, and the frequency with which they perform that task.

在最近的过去，采矿业目睹了金属和非金属矿场的死亡人数大幅增加，但目前尚不清楚为什么会发生这种情况。一种可能的解释是，工人们很难识别工作场所的危险并准确评估相关风险。本研究的目的是在采矿业中探索这种可能性，并更全面地了解石、沙和砾石(SSG)矿工对工地危害和风险的想法、理解和看法。8名矿工接受了采访，并被要求确定他们在工作中遇到的常见危险，然后讨论他们对与这些已确定的危险相关的风险的看法。这项探索性研究的结果表明，工人的工作相关经验的重要性，因为它适用于危险识别和风险感知，特别是他们的知识或熟悉的任务，他们是否有个人控制的任务，以及他们执行该任务的频率。

引用次数: 10

Computational fluid dynamic modeling of a medium-sized surface mine blasthole drill shroud. 中型露天矿爆破孔钻头护罩的计算流体动力学模型。

Mining engineering

Pub Date : 2016-11-01 DOI: 10.19150/me.6831

Y Zheng, W R Reed, L Zhou, J P Rider

The Pittsburgh Mining Research Division of the U.S. National Institute for Occupational Safety and Health (NIOSH) recently developed a series of models using computational fluid dynamics (CFD) to study airflows and respirable dust distribution associated with a medium-sized surface blasthole drill shroud with a dry dust collector system. Previously run experiments conducted in NIOSH's full-scale drill shroud laboratory were used to validate the models. The setup values in the CFD models were calculated from experimental data obtained from the drill shroud laboratory and measurements of test material particle size. Subsequent simulation results were compared with the experimental data for several test scenarios, including 0.14 m³/s (300 cfm) and 0.24 m³/s (500 cfm) bailing airflow with 2:1, 3:1 and 4:1 dust collector-to-bailing airflow ratios. For the 2:1 and 3:1 ratios, the calculated dust concentrations from the CFD models were within the 95 percent confidence intervals of the experimental data. This paper describes the methodology used to develop the CFD models, to calculate the model input and to validate the models based on the experimental data. Problem regions were identified and revealed by the study. The simulation results could be used for future development of dust control methods for a surface mine blasthole drill shroud.

美国国家职业安全与健康研究所（NIOSH）匹兹堡采矿研究部最近利用计算流体动力学（CFD）开发了一系列模型，用于研究与带有干式除尘系统的中型地表爆破钻孔护罩相关的气流和可吸入粉尘分布情况。之前在 NIOSH 的全尺寸钻头护罩实验室进行的实验被用来验证模型。CFD 模型中的设置值是根据钻罩实验室获得的实验数据和测试材料粒度测量结果计算得出的。随后将模拟结果与几种测试方案的实验数据进行了比较，包括 0.14 立方米/秒（300 立方英尺/分）和 0.24 立方米/秒（500 立方英尺/分）的除尘气流，除尘器与除尘气流比分别为 2:1、3:1 和 4:1。对于 2:1 和 3:1 比率，CFD 模型计算出的粉尘浓度在实验数据 95% 的置信区间内。本文介绍了开发 CFD 模型、计算模型输入以及根据实验数据验证模型的方法。研究发现并揭示了存在问题的区域。模拟结果可用于今后开发露天矿爆破孔钻头护罩的粉尘控制方法。

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引用次数: 0

Refuge alternatives relief valve testing and design. 安全阀的检测和设计。

Mining engineering

Pub Date : 2016-10-01 DOI: 10.19150/me.6802

T. Lutz, P. Bissert, G. Homce, J. Yonkey

The U.S. National Institute for Occupational Safety and Health (NIOSH) has been researching refuge alternatives (RAs) since 2007. RAs typically have built-in pressure relief valves (PRVs) to prevent the unit from reaching unsafe pressures. The U.S. Mine Safety and Health Administration requires that these valves vent the chamber at a maximum pressure of 1.25 kPa (0.18 psi, 5.0 in. H2O), or as specified by the manufacturer, above mine atmospheric pressure in the RA. To facilitate PRV testing, an instrumented benchtop test fixture was developed using an off-the-shelf centrifugal blower and ductwork. Relief pressures and flow characteristics were measured for three units: (1) a modified polyvinyl chloride check valve, (2) an off-the-shelf brass/cast-iron butterfly check valve and (3) a commercially available valve that was designed specifically for one manufacturer's steel prefabricated RAs and had been adapted for use in one mine operator's built-in-place RA. PRVs used in tent-style RAs were not investigated. The units were tested with different modifications and configurations in order to check compliance with Title 30 Code of Federal Regulations, or 30 CFR, regulations. The commercially available relief valve did not meet the 30 CFR relief pressure specification but may meet the manufacturer's specification. Alternative valve designs were modified to meet the 30 CFR relief pressure specification, but all valve designs will need further design research to examine survivability in the event of a 103 kPa (15.0 psi) impulse overpressure during a disaster.

自2007年以来，美国国家职业安全与健康研究所(NIOSH)一直在研究避难所替代品(RAs)。RAs通常具有内置的泄压阀(prv)，以防止机组达到不安全的压力。美国矿山安全与健康管理局要求这些阀门在最大压力为1.25千帕(0.18 psi, 5.0英寸)的情况下排出腔室。H2O)，或根据制造商的规定，高于RA中的矿井大气压。为了方便PRV测试，使用现成的离心鼓风机和管道系统开发了一种仪器台式测试夹具。测量了三种装置的泄压和流量特性:(1)改进的聚氯乙烯止回阀，(2)现成的黄铜/铸铁蝶式止回阀，(3)专门为一家制造商的钢制预制RA设计的市售阀，并已用于一家矿山运营商的内置RA。帐篷式RAs中使用的prv未被调查。这些装置在不同的修改和配置下进行了测试，以检查是否符合联邦法规第30条，或30 CFR法规。市售安全阀不符合30cfr的泄压规格，但可能符合制造商的规格。为了满足30cfr的泄压要求，对备选阀的设计进行了修改，但所有的阀门设计都需要进一步的设计研究，以检验在灾难发生时103 kPa (15.0 psi)脉冲超压情况下的生存能力。

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引用次数: 1

Fragmentation modeling using the Multiple Blasthole Fragmentation (MBF) model at an openpit mine 利用多炮眼破片(MBF)模型进行露天矿破片建模

Mining engineering

Pub Date : 2016-10-01 DOI: 10.19150/ME.6801

R. Yang, C. McAllister, J. Berendzen, D. Preece

引用次数: 4

Validation of temperature and humidity thermal model of 23-person tent-type refuge alternative. 23人帐篷式避难方案的温湿度热模型验证。

Mining engineering

Pub Date : 2016-09-01 DOI: 10.19150/ME.6759

L. Yan, D. Yantek, M. Klein, P. Bissert, R. Matetic

U.S. Mine Safety and Health Administration (MSHA) regulations require underground coal mines to use refuge alternatives (RAs) to provide a breathable air environment for 96 hours. One of the main concerns with the use of mobile RAs is heat and humidity buildup inside the RA. The accumulation of heat and humidity can result in miners suffering heat stress or even death. MSHA regulations require that the apparent temperature in an occupied RA not exceed 95 °F. To investigate this, the U.S. National Institute for Occupational Safety and Health (NIOSH) conducted testing on a 23-person tent-type RA in its Experimental Mine in a test area that was isolated from the mine ventilation system. The test results showed that the average measured air temperature within the RA increased by 9.4 °C (17 °F) and the relative humidity approached 94 percent at the end of a 96-hour test. The test results were used to benchmark a thermal simulation model of the tested RA. The validated thermal simulation model predicted the volume-weighted average air temperature inside the RA tent at the end of 96 hours to within 0.06 °C (0.1 °F) of the average measured air temperature.

美国矿山安全与健康管理局(MSHA)规定，地下煤矿必须使用替代避难所(RAs)，以提供长达96小时的可呼吸空气环境。使用移动RA的主要问题之一是RA内部的热量和湿度积聚。热量和湿度的积累可能导致矿工遭受热应激甚至死亡。MSHA法规要求在被占用的RA内的表观温度不超过95°F。为了调查这一点，美国国家职业安全与健康研究所(NIOSH)在其实验矿井的一个与矿井通风系统隔离的试验区对一个23人的帐篷型RA进行了测试。测试结果表明，在96小时的测试结束时，RA内的平均测量空气温度增加了9.4°C(17°F)，相对湿度接近94%。测试结果用于测试RA的热模拟模型的基准测试。经过验证的热模拟模型预测了96小时结束时RA帐篷内的体积加权平均空气温度与平均测量温度的误差在0.06°C(0.1°F)以内。

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引用次数: 6

Evaluation of an E-field through-the-earth (TTE) communications system at an underground longwall mine in West Virginia 西弗吉尼亚州一个地下长壁矿的E场穿透地球（TTE）通信系统的评估

Mining engineering

Pub Date : 2016-09-01 DOI: 10.19150/ME.6758

E. Jong, S. Schafrik

引用次数: 0

Jackleg drill injuries Jackleg钻机受伤

Mining engineering

Pub Date : 2016-08-01 DOI: 10.19150/ME.6711

C. Clark, D. Benton, J. B. Seymour, L. Martin

引用次数: 2

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