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Panel Destressing Strategies for Remnant Pillar Extraction 残柱抽采面板卸荷策略
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-11-16 DOI: 10.46873/2300-3960.1362
Isaac Vennes, H. Mitri
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引用次数: 0
Proposed design fire scenarios for underground hard rock mines 提出了地下硬岩矿山火灾设计方案
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-11-13 DOI: 10.46873/2300-3960.1367
R. Hansen
Abstract Given the complexity and uniqueness of underground hard rock mines, the application of the design fire scenario approach is recommended when evaluating fire safety in mines. Providing a full set of design fire scenarios – ensuring that several important life safety aspects are covered – for a mine can be challenging. The question is whether a catalogue of potential clusters of design fire scenarios could be developed, covering important aspects found underground? Given the general lack of research into design fires in the mining industry, this paper provides a unique analysis of design fire scenarios in underground hard rock mines. Taking advantage of several different and diverse data sources, a comprehensive analysis with holistic character is provided where several proposed clusters of design fire scenarios and analyses of what criteria to apply when evaluating the scenarios are presented. The analysis of suitable criteria highlights the toxicity of the emitted smoke and decrease in visibility as potential criteria underground. The proposed scenarios focus on influencing parameters such as the fire behaviour, position of fire, fire load, and smoke spread. The proposed clusters of design fire scenarios will provide a key tool when evaluating fire protection measures in an underground mine.
摘要鉴于地下硬岩矿山的复杂性和独特性,建议在矿山消防安全评价中应用设计火灾情景法。为矿井提供一套完整的设计火灾场景——确保涵盖几个重要的生命安全方面——可能是一项挑战。问题是,是否可以制定一个潜在的设计火灾场景集群目录,涵盖地下发现的重要方面?针对矿山设计火灾研究普遍缺乏的现状,本文对地下硬岩矿山设计火灾场景进行了独特的分析。利用几个不同的和多样化的数据源,提供了一个全面的分析,其中提出了几个设计火灾场景的集群,并分析了评估场景时应用的标准。对合适标准的分析强调了排放烟雾的毒性和能见度降低作为地下的潜在标准。建议的场景侧重于影响参数,如火灾行为、火灾位置、火灾负荷和烟雾蔓延。提出的设计火灾场景集群将为地下矿山消防措施评估提供关键工具。
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引用次数: 0
Analysis of the application of methane-bearing capacity test methods in the conditions of Polish mining 甲烷承载能力测试方法在波兰采矿条件下的应用分析
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-11-13 DOI: 10.46873/2300-3960.1365
Marcin Karbownik
Abstract The methane hazard is one of the natural hazards occurring in hard coal mining. The content of natural methane in hard coal seams, the so-called methane-bearing capacity, is one of the key parameters that allow for proper assessment of the methane hazard and the state of the threat of gas and rock outbursts. For safety purposes, there is a constant need to improve the methods for the determination of this parameter. In the conditions of Polish mining, the method used for methane-bearing capacity determination is the direct drill cuttings method. This paper contains a comparative study presenting three different methods of methane-bearing capacity determination. Tests were conducted using two direct methods (the drill cuttings method and the United States Bureau of Mines (USBM) method), and the indirect method based on the desorption intensity index. On the basis of the obtained test results, it was found that the results obtained with the USBM method were slightly higher than those obtained with the direct drill cuttings method. Gas losses, an important element affecting the final value of the assay, were also analysed. This comparative study will evaluate the validity and applicability of the above methods under specific conditions in hard coal mining.
摘要甲烷灾害是硬煤开采中发生的自然灾害之一。硬煤层中天然甲烷的含量,即含甲烷能力,是正确评价瓦斯危险性和瓦斯岩突出威胁状态的关键参数之一。为了安全起见,需要不断改进测定该参数的方法。在波兰开采条件下,测定甲烷承载能力的方法是直接钻屑法。本文对三种不同的甲烷承载能力测定方法进行了比较研究。试验采用两种直接法(钻屑法和美国矿产局(USBM)法)和基于脱附强度指数的间接法进行。根据获得的试验结果,发现USBM法获得的结果略高于直接钻屑法获得的结果。气体损失是影响测定最终值的重要因素,也进行了分析。本对比研究将对上述方法在硬煤开采具体条件下的有效性和适用性进行评价。
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引用次数: 0
Numerical modelling of destress blasting – A state-of-the-art review 应力爆破的数值模拟技术综述
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-11-13 DOI: 10.46873/2300-3960.1366
Shuting Miao, P. Konicek, P. Pan, H. Mitri
Abstract As a proactive mine safety measure against the occurrence of rockburst, destress blasting has been applied to numerous mining conditions to precondition highly stressed rock mass to mitigate the risk of rockburst occurrence in deep mines as well as in deep underground constructions. However, the application of destress blasting mostly depends on engineering experience, while its mechanism and efficiency have not been well understood. Rapid advances in computer technology have made numerical simulation an economical and effective method to study the rock blasting effect. Enormous research efforts have been made to numerically investigate the blasting fracture mechanism, optimize blasting design, and assess the ef fi ciency of destress blasting. This review focuses on the state-of-the-art progress in numerical modelling associated with destress blasting over the last two decades. Some commonly used modelling approaches for destressing blasting are compared and reviewed. Currently, two different ways of modelling based on static and dynamic modes are typically used to study the effect of blasting. In the static method, destress blasting is simulated by modifying the rock mass’s stiffness and strength properties to obtain the post-blast stress state in the destressed zone. The dynamic modelling technique focuses on the dynamic fracture process of coals and rock masses, during which the predetermination of the damage induced by blasting is not necessary. Moreover, the extent of damage zones around the blast hole can be precisely estimated in the dynamic modelling method by considering time-varying blast pressure and strain rate dependency on the strength of rock mass but at the cost of increased computation and complexity. Besides, different destress blasting modelling methods, generally classified into continuum-based, discrete-based, and coupled methods, are compared and reviewed. The fracture mechanism of blasting in the rock mass is revealed, and the destressing efficiency of the existing destress blasting design is assessed and compared with classical results. The factors that may affect the efficiency of destress blasting are summarized. Finally, the difficulties and challenges associated with the numerical modelling of destress blasting are highlighted briefly.
应力爆破作为一种针对冲击地压发生的主动矿山安全措施,已应用于多种开采条件下,对高应力岩体进行预处理,以降低深部矿山和深部地下建筑发生冲击地压的风险。然而,应力爆破的应用大多依赖于工程经验,其机理和效果尚未得到很好的了解。计算机技术的飞速发展使数值模拟成为研究岩石爆破效果的一种经济有效的方法。在数值研究爆破破裂机理、优化爆破设计、评价应力爆破效果等方面进行了大量的研究工作。本文综述了近二十年来应力爆破数值模拟研究的最新进展。对几种常用的卸压爆破建模方法进行了比较和评述。目前,研究爆破效果通常采用静态模型和动态模型两种不同的建模方法。在静力法中,通过改变岩体的刚度和强度特性来模拟应力爆破,得到爆破后的应力状态。动态建模技术关注的是煤岩体的动态破裂过程,在此过程中不需要对爆破损伤进行预估。此外,考虑岩体强度随时间变化的爆破压力和应变率,动态建模方法可以准确地估计出爆破孔周围的损伤区范围,但计算量和复杂度都有所增加。此外,还对不同的应力爆破建模方法进行了比较和综述,一般分为基于连续体的、基于离散的和耦合的三种方法。揭示了爆破在岩体中的破裂机理,评价了现有爆破设计的卸压效果,并与经典结果进行了比较。总结了影响应力爆破效果的因素。最后,简要介绍了应力爆破数值模拟的难点和挑战。
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引用次数: 2
Seismic activity and flooding of hard coal mines in the Ostrava-Karvina Coalfield 奥斯特拉瓦-卡尔维纳煤田坚硬煤矿的地震活动与水淹
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-11-13 DOI: 10.46873/2300-3960.1363
P. Konicek, E. Jirankova, V. Kajzar, J. Schreiber, Pavel Malucha, Kristýna Schuchová
Abstract The termination of mining activities often results in post-mining problems and risks. One of these issues is the flooding of mines. Long-term mining in the Ostrava and Petrvald sub-basins in the Upper Silesian Coal Basin finished in 1994. Tens of coal seams were mined here, and the depth of mining reached more than 1000 m below the surface. Flooding of the Ostrava sub-basin started in 1994. The Ostrava and Petrvald sub-basins were flooded from one half only to prevent water from flooding into the Karvina sub-basin, where mining continued. The continual pumping of water has been carried out ever since. Only low-energy seismic events (up to 103 J) were recorded during the periods of flooding and water pumping. Only one high-energy seismic event was recorded here (108 J, magnitude of 3.5, 12 December 2017). This study presents the natural and mining conditions regarding the process of mine flooding; and the induced seismicity registered during the flooding of mines and the preservation of water at the stated level. Analysis of the flooding of mines in connection to the registered seismicity is presented. Probable reasons for the low seismic activity during the flooding of mines are also discussed.
采矿活动的终止往往会导致采矿后的问题和风险。其中一个问题是地雷泛滥。上西里西亚煤田Ostrava和Petrvald子盆地的长期开采于1994年结束。这里开采了数十个煤层,开采深度达到地表以下1000多米。俄斯特拉发次盆地的洪水开始于1994年。Ostrava和Petrvald子盆地仅从一半淹水,以防止水涌入Karvina子盆地,在那里采矿继续进行。从那时起就一直在抽水。在淹水和抽水期间,仅记录到低能量地震事件(最高达103 J)。仅记录到一次高能地震事件(2017年12月12日,108 J,震级3.5)。研究了矿山水浸过程的自然条件和开采条件;在矿井淹水和水保持在规定水平期间记录的诱发地震活动。分析了矿山淹水与已记录地震活动性的关系。讨论了矿井淹水期间地震活动低的可能原因。
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引用次数: 0
Effect of mining and geology on mining-induced seismicity – A case study 采矿和地质对采矿诱发地震活动性的影响——一个实例研究
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-11-08 DOI: 10.46873/2300-3960.1361
H. Khalil, Tuo Chen, Yu-Hang Xu, H. Mitri
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引用次数: 0
Uncertainty analysis of operational conditions in selective artificial ground freezing applications 选择性人工冻结地面运行条件的不确定性分析
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-10-27 DOI: 10.46873/2300-3960.1357
Ahmad F. Zueter, Saad Akhtar, A. Sasmito
Abstract Artificial ground freezing (AGF) systems are susceptible to uncertain parameters highly affecting their performance. Particularly, selective artificial ground freezing (S-AGF) systems involve several uncertain operational conditions. In this study, uncertainty analysis is conducted to investigate four operational parameters: 1) coolant inlet temperature, 2) coolant flow rate, 3) pipes emissivity, and 4) pipes eccentricity. A reduced-order model developed and validated in our previous work for field-scale applications is exploited to simulate a total of 5,000 cases. The uncertain operational parameters are set according to Monte Carlo analysis based on field observations of a field-scale freeze-pipe in the mining industry extending to 460 m below the ground surface. The results indicate that the freezing time can range between 270 and 350 days with an average of 310 days, whereas the cooling load per one freeze-pipe ranges from 90 to 160 MWh, with an average of 129 MWh. Furthermore, it is observed that the freezing time and energy consumed are mostly dominated by the coolant inlet temperature, while energy dissipated in the passive zone (where ground freezing is not needed) is mostly affected by pipes emissivity. Overall, the conclusions of this study provide useful estimations for engineers and practitioners in the AGF industry. Abstract Arti fi cial ground freezing (AGF) systems are susceptible to uncertain parameters highly affecting their performance. Particularly, selective arti fi cial ground freezing (S-AGF) systems involve several uncertain operational conditions. In this study, uncertainty analysis is conducted to investigate four operational parameters: 1) coolant inlet temperature, 2) coolant fl ow rate, 3) pipes emissivity, and 4) pipes eccentricity. A reduced-order model developed and validated in our previous work for fi eld-scale applications is exploited to simulate a total of 5000 cases. The uncertain operational parameters are set according to Monte Carlo analysis based on fi eld observations of a fi eld-scale freeze-pipe in the mining industry extending to 460 m below the ground surface. The results indicate that the freezing time can range between 270 and 350 days with an average of 310 days, whereas the cooling load per one freeze-pipe ranges from 90 to 160 MWh, with an average of 129 MWh. Furthermore, it is observed that the freezing time and energy consumed are mostly dominated by the coolant inlet temperature, while energy dissipated in the passive zone (where ground freezing is not needed) is mostly affected by pipes emissivity. Overall, the conclusions of this study provide useful estimations for engineers and practitioners in the AGF industry.
摘要人工冻结系统易受不确定参数的影响,对其性能有很大影响。特别是,选择性人工冻结(S-AGF)系统涉及几个不确定的操作条件。在本研究中,对4个运行参数进行了不确定性分析:1)冷却剂进口温度,2)冷却剂流量,3)管道发射率,4)管道偏心。在我们之前的现场规模应用中开发并验证了一个降阶模型,用于模拟总共5000个案例。根据某采矿业现场规模冻结管延伸至地表以下460 m的现场观测资料,采用蒙特卡罗分析方法确定了不确定运行参数。结果表明:冻结时间在270 ~ 350天之间,平均为310天;每根冻结管的冷负荷在90 ~ 160 MWh之间,平均为129 MWh。冻结时间和能量消耗主要受冷却剂入口温度的影响,而被动区(不需要地面冻结)的能量耗散主要受管道发射率的影响。总的来说,本研究的结论为AGF行业的工程师和从业者提供了有用的估计。摘要人工冻结系统易受不确定参数的影响,对其性能有很大影响。特别是,选择性人工地面冻结(S-AGF)系统涉及几个不确定的操作条件。在本研究中,对4个运行参数进行了不确定性分析:1)冷却剂进口温度,2)冷却剂流量,3)管道发射率,4)管道偏心。在我们之前的工作中开发并验证了一个用于现场规模应用的降阶模型,用于模拟总共5000个案例。根据矿山现场尺度冻结管的现场观测结果,通过蒙特卡罗分析,确定了不确定运行参数。结果表明:冻结时间在270 ~ 350天之间,平均为310天;每根冻结管的冷负荷在90 ~ 160 MWh之间,平均为129 MWh。冻结时间和能量消耗主要受冷却剂入口温度的影响,而被动区(不需要地面冻结)的能量耗散主要受管道发射率的影响。总的来说,本研究的结论为AGF行业的工程师和从业者提供了有用的估计。
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引用次数: 1
Carbonised fluidised fly ash (CFFA); A new product for mining engineering purposes (discussion of possible applications) 碳化流化粉煤灰;用于采矿工程的新产品(讨论可能的应用)
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-10-26 DOI: 10.46873/2300-3960.1359
M. Łączny, Przemysław Rompalski
The article presents and summarises the current state of research and laboratory results on the carbonation of fly ash with carbon dioxide in the context of its use in mining engineering. Based on previous publications and patent applications, the possibilities of using carbonated fly ash from fluidised bed boilers for the following applications were discussed: securing excavations particularly susceptible to fire hazards, shotcreting and securing longwalls and supports, constructing cases, securing decommissioned shafts, and others, which means wherever the use of cement is required. It was pointed out that the removal of excess free calcium oxide makes it possible to use carbonated fly ash in mining applications for placement in workings requiring increased tightness. It was also stated that carbonation allows the removal of hydrogen from fluidised fly ash (FFA) obtained during co-combustion. The research highlighted the potential and importance of granulating carbonised FFA in expanding the applications of this innovative product in mining engineering.
本文从粉煤灰在采矿工程中的应用出发,综述了粉煤灰与二氧化碳碳化的研究现状和实验室结果。根据以前的出版物和专利申请,讨论了将流化床锅炉的碳化粉煤灰用于以下应用的可能性:确保易受火灾危险影响的挖掘,喷射和固定长壁和支架,建筑外壳,固定退役井等,这意味着需要使用水泥的地方。有人指出,除去多余的游离氧化钙,可以在采矿应用中使用碳化粉煤灰,将其放置在需要增加密封性的工作中。还指出,碳化可以从共燃烧过程中获得的流化飞灰(FFA)中除去氢。这项研究强调了碳化FFA造粒在扩大这种创新产品在采矿工程中的应用方面的潜力和重要性。
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引用次数: 0
Addressing specific safety and occupational health challenges for the Canadian mines located in remote areas where extreme weather conditions dominate 解决位于极端天气条件占主导地位的偏远地区的加拿大矿山的具体安全和职业健康挑战
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-10-25 DOI: 10.46873/2300-3960.1358
Rachid Halabi, M. Kumral
The number of mining operations is increasing in the Canadian North, where extreme weather conditions govern. Currently, many mine development projects are also in progress in this region. These mines’ working atmosphere and employment circumstances are highly different from regular mines. One of the main differences is the special safety issues of the Canadian North. The primary sources of these special issues are: the difficulty of finding skilled employees; high employee turnover rate; insufficient training and certification requirements; delicate employment circumstances affecting the psychological well-being of employees; permafrost; mine inspection challenges; inventory and logistic hardship; and the legislative and regulative necessities corresponding to the particular working environment. This paper aims to set forth specific safety cases in the mines located in the Canadian North. Then, it argues the characteristics of safety organizations and management required to deal with these cases. Furthermore, how the current frameworks can be improved is discussed. Safety issues stemming from cold weather conditions and location remoteness of mines add further challenges to the viability and implementation of projects. The paper underlines that mining operations need certain safety organizations, management approaches, and specific regulations for the mines operated in remote areas and under severe weather conditions.
在加拿大北部的极端天气条件下,采矿作业的数量正在增加。目前,该地区也正在进行许多矿山开发项目。这些矿山的工作氛围和就业环境与普通矿山有很大的不同。主要区别之一是加拿大北部的特殊安全问题。这些特殊问题的主要来源是:难以找到熟练的员工;员工离职率高;培训和认证要求不足;影响员工心理健康的微妙就业环境;永冻层;矿山检查挑战;库存和后勤困难;以及与特定工作环境相对应的立法和法规的必要性。本文旨在阐述加拿大北部矿山的具体安全案例。然后,论述了处理这些案例所需要的安全组织特点和管理。此外,还讨论了如何改进现有框架。寒冷的天气条件和矿井位置偏远所造成的安全问题进一步挑战了项目的可行性和执行。本文强调,偏远地区和恶劣天气条件下的矿山开采作业需要一定的安全组织、管理办法和具体规定。
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引用次数: 0
Investigating the causes of stope instability at Golden Valley Mine 金谷矿采场失稳原因调查
IF 1 Q1 Earth and Planetary Sciences Pub Date : 2022-08-15 DOI: 10.46873/2300-3960.1354
Ashley Ruvimbo Sabao, Prosper Munemo, Peter Kolapo
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引用次数: 0
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Journal of Sustainable Mining
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