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International Journal of Coal Science & Technology 2020年第1期7卷 107-121页

作者： Marek Wieckowski Natalia Howaniec Adam Smolinski Department of Mining Aerology Central Mining InstitutePlac Gwarkow 140-166 KatowicePoland department of Energy Saving and Air Protection Central Mining InstitutePlac Gwarkow 140-166 Katowice.Poland Central mining Institute Plac Gwarkow 1.40-166 KatowicePoland

The flow velocity of gases in gobs directly influences the kinetics and intensity of gaseous components release during heating and cooling of coal.The assessment of fire hazard is performed on the basis of concentrations of particular gases in a mine air.These concentrations differ in coal heating and cooling phase which was proven in the study.This paper presented the results of the experimental study on temperature distribution in a simulated coal bed in heating(50–250°C)and cooling(250–35°C)phases as well as its correlation to variations in concentration of gases released in these phases and flow rates of gases flowing through the coal bed.The research was performed on twenty-two samples of bituminous coals acquired from various coal beds of Polish coal mines.Considerable differences were observed between heating and cooling phases in terms of the concentrations of gases taken into account in calculations of self-combustion index.In the heating phase temperature increase resulted in the decrease of concentrations ratios of ethane,ethylene,propane,propylene and acetylene,while in the cooling phase these ratios increased systemically.The effect of air(in heating phase)and nitrogen(in cooling phase)flow rate on the self-ignition index CO/CO2 was also determined.

关键词： Coal Self-heating Fire hazard Flow rate

基于基因表达编程和粒子群优化鲁棒混合计算模型的深部地下矿井岩爆分类

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土木与环境工程学报（中英文） 2023年第2期45卷 21-38页

作者： TRAN Quang-Hieu BUI Xuan-Nam NGUYEN Hoang department of Surface mining Mining Faculty/Innovations for Sustainable and Responsible Mining(ISRM)Research GroupHanoi University of Mining and GeologyHanoi 100000Vietnam

在深部地下采矿中,岩爆因具有许多不利影响(如对人员、设备、隧道/地下矿山工作面和开采周期等的影响)而被视为不确定性风险。由于其不确定性的特征,对岩爆趋势的准确预测和分类具有一定难度,且已有研究成果较少。提出一种基于基因表达... 详细信息

在深部地下采矿中,岩爆因具有许多不利影响(如对人员、设备、隧道/地下矿山工作面和开采周期等的影响)而被视为不确定性风险。由于其不确定性的特征,对岩爆趋势的准确预测和分类具有一定难度,且已有研究成果较少。提出一种基于基因表达编程(GEP)和粒子群优化(PSO)的鲁棒混合计算模型GEP-PSO,用于预测和分类深部开口的岩爆趋势,提高了预测和分类的准确性。在建立GEP-PSO模型的过程中,评估GEP模型中不同数量的基因(1~4)和连接功能(例如,加法、提取、乘法和除法)。收集246次岩爆发生的地质和施工因素,用于建立岩爆分类的GEP-PSO模型;应用处理数据集缺失值的技术改进数据集的属性;用相关矩阵选取潜在输入参数的特征;建立13个混合GEP-PSO模型,得到各模型的精度。结果表明:在GEP结构中具有3个基因和乘法连接函数的GEP-PSO模型具有最高的准确度(80.49%)。将获得的最佳GEP-PSO模型的结果与基于相同数据集开发的各种已有模型进行比较,结果表明,选择的GEP-PSO模型结果优于已有模型,表明提出的GEP-PSO模型在岩爆等级的预测和分类方面的准确性显著提高,可以应用于深开挖工程中,以准确预测和评估岩爆敏感性。

关键词：岩爆 GEP-PSO模型地下采矿深开挖风险评估

Modern experience of low-coal seams underground mining in Ukraine

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International Journal of mining Science and Technology 2018年第6期28卷 917-923页

作者： Mykhailo V.Petlovanyi Vasyl H.Lozynskyi Pavlo B.Saik Kateryna S.Sai Underground mining department National Mining UniversityDnipro

Coal is the main energy resource in Ukraine. However geotechnological aspects of coal seams development and Ukrainian crisis have a negative influence on the mining industry. This article analyzes the experience in the development of very low and low-coal seams with 0.7–1.0 m thickness, as well as advanced technological solutions that allowed private coal enterprises, despite the difficult situation in the country, to maintain sufficient(more than 75% of all production) level of steam coal extraction for Ukrainian society. Given that Ukrainian's mining sector development is a huge task, we hope this review will add some discussions into the ongoing conversation.

关键词： Coal mining Mine Ukraine

基于基因表达编程和粒子群优化鲁棒混合计算模型的深部地下矿井岩爆分类（英文）

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土木与环境工程学报(中英文) 2022年

作者： Quang-Hieu TRAN Xuan-Nam BUI Hoang NGUYEN department of Surface mining Mining Faculty Innovations for Sustainable and Responsible mining (ISRM)Research Group Hanoi University of Mining and Geology

在深部地下采矿中，岩爆因具有许多不利影响（如，对人员、设备、隧道/地下矿山工作面和开采周期等的影响）而被视为不确定性风险。由于其不确定性的特征，对岩爆趋势的准确预测和分类具有一定难度，且已有研究成果较少。提出一种基于... 详细信息

在深部地下采矿中，岩爆因具有许多不利影响（如，对人员、设备、隧道/地下矿山工作面和开采周期等的影响）而被视为不确定性风险。由于其不确定性的特征，对岩爆趋势的准确预测和分类具有一定难度，且已有研究成果较少。提出一种基于基因表达编程（GEP）和粒子群优化（PSO）的鲁棒混合计算模型GEP-PSO，用于预测和分类深部开口的岩爆趋势，提高了预测和分类的准确性。在建立GEP-PSO模型过程中，评估了GEP模型中不同数量的基因（1～4）和连接功能（例如，加法、提取、乘法和除法）。收集了246次岩爆发生的地质和施工因素，用于建立岩爆分类的GEP-PSO模型；应用处理数据集缺失值的技术改进数据集的属性；用相关矩阵选取潜在输入参数的特征；建立了13个混合GEP-PSO模型，得到了各模型的精度。结果表明：在GEP结构中具有3个基因和乘法连接函数的GEP-PSO模型具有最高的准确度（80.49%）。将获得的最佳GEP-PSO模型的结果与基于相同数据集开发的各种已有模型进行比较，结果表明：选择的GEP-PSO模型结果优于已有模型，表明提出的GEP-PSO模型在岩爆等级的预测和分类方面的准确性显著提高，可以应用于深开挖工程中，以准确预测和评估岩爆敏感性。

关键词：岩爆 GEP-PSO模型地下采矿深开挖风险评估

Influence of canopy ratio of powered roof support on longwall working stability——A case study

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International Journal of mining Science and Technology 2019年第4期29卷 591-598页

作者： Sylwester Rajwa Tomasz Janoszek Stanis?aw Prusek department of Extraction Technologies Rockburst and Mining Support Central Mining Institute

The case study describes longwall coal seam A in a hard coal mine,where longwall coal face stability loss and periodic roof fall occurrences had been registered.The authors have attempted to explain the situation based on in-situ measurements and observations of the longwall working as well as numerical simulation.The calculations included several parameters,such as powered roof support geometry in the form of the canopy ratio,which is a factor that influences load distribution along the canopy.Numerical simulations were realized based on a rock mass model representing realistic mining and geological conditions at a depth of 600 m below surface for coal seam A.Numerical model assumptions are described,while the obtained results were compared with the in-situ measurements.The conclusions drawn from this work can complement engineering knowledge utilized at the stage of powered roof support construction and selection in order to improve both personnel safety and longwall working stability,and to achieve better extraction.

关键词： Coal mining Modelling Powered roof supports Longwall workings Safety Stability

Influence of longwall gateroad convergence on the process of mine ventilation network-model tests

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International Journal of mining Science and Technology 2019年第4期29卷 585-590页

作者： Andrzej Walentek Tomasz Janoszek Stanis?aw Prusek Aleksander Wrana department of Extraction Technologies Rockburst and Mining Support Central Mining Institute

Hard coal mines are required to constantly ventilate mine workings to ensure that the air composition is at a certain humidity and temperature level that is comfortable for underground mine workers,especially in deep deposits.All underground workings,which are part of the mine ventilation network,should be ventilated in a way that allows maintaining proper oxygen concentration not lower than 19%(by volume),and limits concentration of gases in the air such as methane,carbon monoxide or carbon dioxide.The air flow in the mine ventilation network may be disturbed due to the natural convergence(deformation)and lead to change in its original cross-section.Reducing the cross-sectional area of the mining excavation causes local resistances in the air flow and changes in aerodynamic potentials,which leads to emergency states in the mine ventilation network.This paper presents the results of numerical simulations of the influence of gateroad convergence on the ventilation process of a selected part of the mine ventilation network.The gateroad convergence was modelled with the finite element software PHASE 2.The influence of changes in the cross-sectional area of the gateroad on the ventilation process was carried out using the computational fluid dynamics software Ansys-Fluent.

关键词： Geomechanics Convergence Numerical modelling Ventilation process Support

Ground response to high horizontal stresses during longwall retreat and its implications for longwall headgate support

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International Journal of mining Science and Technology 2019年第1期29卷 27-33页

作者： Peter Zhang Dave Gearhart Mark Van Dyke Daniel Su Essie Esterhuizen Berk Tulu NIOSH Pittsburgh Mining Research Division(PMRD) department of mining Engineering West Virginia University

Roof falls in longwall headgate can occur when weak roof and high horizontal stress are present. To prevent roof falls in the headgate under high horizontal stress, it is important to understand the ground response to high horizontal stress in the longwall headgate and the requirements for supplemental roof support. In this study, a longwall headgate under high horizontal stress was instrumented to monitor stress change in the pillars, deformations in the roof, and load in the cable bolts. The conditions in the headgate were monitored for about six months as the longwall face passed by the instrumented site.The roof behavior in the headgate near the face was carefully observed during longwall retreat.Numerical modeling was performed to correlate the modeling results with underground observation and instrumentation data and to quantify the effect of high horizontal stress on roof stability in the longwall headgate. This paper discusses roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary.

关键词： Longwall mining Longwall headgate High horizontal stress Supplemental support

Study on failure mechanism of room and pillar with different shapes and configurations under uniaxial test and numerical simulation compression using experimental test and numerical simulation

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Underground Space 2023年第2期9卷 105-121页

作者： Vahab Sarfarazi Nima Babanouri Shahin Fattahi Kaveh Asgari department of mining Engineering Hamedan University of TechnologyHamedanIran department of mining Engineering Shahid Bahonar University of KermanKermanIran

Experimental and discrete element methods were used to investigate the failure behavior of room and pillar with different configura-tions under uniaxial loading.Concrete samples with dimension of 15 cm×15 cm×5 cm were prepared.Within the specimens,rooms and pillars with different configurations were provided.The room dimension was 1 cm×1 cm,and the pillar dimension was according to the room configuration.Twelve different configurations were chosen for rooms and pillars.The axial load was applied to the model by rate of 0.05 mm/min.The results show that the failure process was mostly governed by both the non-persistent joint angle and joint number.The compressive strength of the specimens was related to the fracture pattern and failure mechanism of the pillars.It was shown that the shear behaviour of pillars was related to the number of the induced tensile cracks,which increased by increasing the room angle.The compressive strength of samples increased with the increase of the room angle.The failure pattern and failure strength are similar in both methods,i.e.,the experimental testing and the numerical simulation.

关键词： PFC2D Physical test Rock pillar

倾斜煤层长壁开采承压底板力学结构及渗流稳定性分析

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Journal of Central South University 2023年第9期30卷 2948-2965页

作者：梁帅帅张东升范钢伟 KOVALSKY Evgeny 范张磊张磊韩学森 School of Mines China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Resources and Safe mining China University of Mining and TechnologyXuzhou 221116China department of mining Engineering Saint Petersburg Mining UniversitySaint Petersburg 199106Russia

倾斜煤层开采底板破坏易造成水资源流失甚至突水灾害问题,倾斜煤层产量在中国总产量中占有一定比例,因此,开展关于地面结构对地下开采响应稳定性的研究有重要意义。首先,通过分析底板应力状态与变形破坏规律,建立了双向线性载荷作用下... 详细信息

倾斜煤层开采底板破坏易造成水资源流失甚至突水灾害问题,倾斜煤层产量在中国总产量中占有一定比例,因此,开展关于地面结构对地下开采响应稳定性的研究有重要意义。首先,通过分析底板应力状态与变形破坏规律,建立了双向线性载荷作用下四边固支倾斜层合板模型;然后,通过研究渗透系数与变形之间的关系得到渗流稳定性判别方法及条件,并通过工程案例确定了倾斜煤层保水开采的影响因素及其敏感性。倾斜煤层底板最大挠度工作面方向位于工作面中下部0.5864倍的工作面长度处,推进方向上位于0.5864倍的工作面推进距离处。通过正交试验分析得出底板挠度影响因素的显著性大小排序为:工作面长度>水压>推进度>地层倾角。层合板中上层层位边界为压应力区域,中部为拉应力区域,中下层层位则相反,剪应力分区域集中分布。工作面下侧区域各应力最大值均大于上侧区域的,表现出明显的非对称性。最后,确定了渗流稳定性评价指标及稳定条件:极限渗透系数(K_(li))与等效渗透系数(K_(eq))之比不小于1,即K_(li)/K_(eq)≥1。渗流稳定性影响因素的显著性大小为:水压>工作面长度>地层倾角,可为类似矿井的保水开采提供建议。

关键词：层合板模型倾斜煤层结构稳定性渗流稳定性等效渗透系数正交分析显著性分析

Analysis of global and local stress changes in a longwall gateroad

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International Journal of mining Science and Technology 2018年第1期28卷 127-135页

作者： I.B.Tulu G.S.Esterhuizen D.Gearhart T.M.Klemetti K.M.Mohamed D.W.H.Su department of mining Engineering West Virginia University NIOSH Pittsburgh Mining Research Division

A numerical-model-based approach was recently developed for estimating the changes in both the horizontal and vertical loading conditions induced by an approaching longwall face.In this approach, a systematic procedure is used to estimate the model's inputs.Shearing along the bedding planes is modeled with ubiquitous joint elements and interface elements.Coal is modeled with a newly developed coal mass model.The response of the gob is calibrated with back analysis of subsidence data and the results of previously published laboratory tests on rock fragments.The model results were verified with the subsidence and stress data recently collected from a longwall mine in the eastern United States.

关键词： Longwall mining Gateroad design Flac3D Horizontal angle Gob loading Hollow inclusion cells