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Simulation research and application on response characteristics of detecting water-filled goaf by transient electromagnetic method

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International Journal of Coal Science & technology 2022年第2期9卷 167-192页

作者： Tingye Qi Fan Zhang Xiaoming Pei Guorui Feng Huiru Wei College of mining engineering Taiyuan University of TechnologyTaiyuan 030024China research center of green mining engineering technology in shanxi province Taiyuan 030024China

Water inrush disasters poses a great threat to the safe exploitation of coal resources.To solve this problem,the transient electromagnetic method(TEM)was proposed to accurately detect the water accumulation in the goaf.The electromagnetic response characteristics of diferent water-flled goaves were studied by electromagnetic feld theory,numerical simulation and feld verifcation.Through the models of 100%water accumulation,50%water accumulation,0%water accumulation,100%water accumulation with collapsed rock,50%water accumulation with collapsed rock and 0%water accumulation with collapsed rock goaf,the characteristics of induced voltage attenuation curves were studied.Meanwhile,the relationship between the attenuation voltage value and area of the transmitting coil,the depth of the goaf,the background resistivity,and the delay time were also simulated.The results illustrate that the attenuation curve of induced voltage presented a regular exponential decay form in the 0%water accumulation model but existed abnormal exaltation for voltage in water-flled model.Through the linear ftting curve,it can be seen that the abnormal intensity of the induced voltage becomes stronger as the distance between the measuring point and the center of the target decrement.Moreover,the abnormal amplitude of the induced voltage increases with the rise of the water accumulation and collapsed rock will weakly reduce the low-resistivity anomalous efect on the water-accumulated goaf.In addition,the response value of the attenuation voltage increased as the area of the transmitting coil increases,but decreased with increasing delay time and increasing background resistivity and depth of the target body.The feld detection results of the Majiliang coal mine also confrmed the theoretical analysis and the numerical simulation.

关键词： Transient electromagnetic method Water-accumulated goaf Forward and inverse simulation Attenuation curve of induced voltage

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Effect of calcination temperature on the pozzolanic activity of maize straw stem ash treated with portlandite solution

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1161-1169页

作者： Tingye Qi Haochen Wang Guorui Feng Yujiang Zhang Jinwen Bai Yanna Han College of mining technology Taiyuan University of TechnologyTaiyuan 030024China shanxi province research center of green mining engineering technology Taiyuan 030024China shanxi Coal-based Resources green-efficient mining engineering research center Taiyuan 030024China Key Laboratory of shanxi province for Mine Rock Strata Control and Disaster Prevention Taiyuan 030024China

The effect of calcination temperature on the pozzolanic activity of maize straw stem ash(MSSA)was evaluated.The MSSA samples calcined at temperature values of 500,700,and 850℃ were dissolved in portlandite solution for 6 h,thereby obtaining residual samples.The MSSA and MSSA residual samples were analyzed using Fourier transform infrared spectroscopy,X-ray powder diffraction scanning electron microscopy,and X-ray photoelectron spectroscopy to determine vibration bonds,minerals,microstructures,and Si 2p transformation behavior.The conductivity,pH value,and loss of conductivity with dissolving time of the MSSA-portlandite mixed solution were also determined.The main oxide composition of MSSA was silica and potassium oxide.The dissolution of the Si^(4+) content of MSSA at 500℃ was higher than those of the other calcination temperatures.The conductivity and loss of conductivity of MSSA at 700℃ were higher than those of the other calcination temperatures at a particular dissolving time due to the higher KCl content in MSSA at 700℃.C-S-H was easily identified in MSSA samples using X-ray powder diffraction,and small cubic and nearly spherical particles of C-S-H were found in the MSSA residual samples.In conclusion,the optimum calcination temperature of MSSA having the best pozzolanic activity is 500℃,but excessive agglomeration must be prevented.

关键词： calcination temperature pozzolanic activity maize straw stem ash portlandite solution

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掘进应力路径下充填和非充填裂隙岩石的破裂特征研究

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Journal of Central South University 2023年第1期30卷 175-188页

作者：崔家庆冯国瑞李竹韩艳娜宋诚 College of mining engineering Taiyuan University of TechnologyTaiyuan 030024China shanxi province research Centre of green mining engineering technology Taiyuan 030024China

充填裂隙岩体在超前注浆巷道开挖后起主要承载作用。本文通过对开挖过程的数值模拟获得掘进应力路径,分别在常规压缩及掘进应力路径下对含充填裂隙岩石进行加载;同时采用数字图像相关法及声发射设备对岩石破裂过程进行监测。结果表明掘... 详细信息

充填裂隙岩体在超前注浆巷道开挖后起主要承载作用。本文通过对开挖过程的数值模拟获得掘进应力路径,分别在常规压缩及掘进应力路径下对含充填裂隙岩石进行加载;同时采用数字图像相关法及声发射设备对岩石破裂过程进行监测。结果表明掘进应力路径对含充填裂隙岩石有三种影响:1)压密;2)裂隙附近的强度异化;3)裂隙尖端形成预裂。压密导致树脂充填试件起裂角减小。裂隙附近强度的异化导致在未充填试件裂隙靠近长边的区域拉伸和压缩变形交替出现,水泥充填试件由突然变形转为渐进变形,树脂充填试件则相反。预裂减弱了未充填试件的强度,改变了水泥充填试件剪切裂纹的传播方向。

关键词：掘进应力路径充填裂隙注浆裂隙发展

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Creep properties and resistivity-ultrasonic-AE responses of cemented gangue backfill column under high-stress area

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International Journal of mining Science and technology 2021年第3期31卷 401-412页

作者： Hongyu Ran Yuxia Guo Guorui Feng Tingye Qi Xianjie Du College of mining engineering Taiyuan University of TechnologyTaiyuan 030024China shanxi province research Centre of green mining engineering technology Taiyuan 030024China

To investigate the creep and instability properties of a cemented gangue backfill column under a highstress area,the uniaxial compression creep tests were conducted by single-step and multi-step loading of prismatic samples made of cemented gangue backfill material(CGBM)under the high stressstrength ratio.The creep damage was monitored using an electrical resistivity device,ultrasonic testing device,and acoustic emission(AE)instrument.The results showed that the CGBM sample has a creep hardening property.The creep failure strength(CFS)is slightly larger than the uniaxial compressive strength(UCS),ranging in ratio from 108.9%to 116.5%.The instantaneous strain,creep strain,and creep rate increase with increasing stress-strength ratio in the single-step loading creep tests.The instantaneous strain and creep strain decrease first and then increase during the multi-step loading creep process.The axial creep strain of the CGBM column can be expressed by the viscoelastic-plastic creep model.Creep instability is caused by the accumulation of strain energy under multi-step loading and the continuous lateral expansion at the unconstrained middle position during the creep process.The creep stability of a CGBM column in a high-stress area can be monitored based on the variation of electrical resistivity,ultrasonic pulse velocity(UPV),and AE signals.

关键词： Cemented gangue backfill column Creep and instability properties High-stress area Electrical resistivity Ultrasonic pulse velocity Acoustic emission

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Characteristics of dust distributions and dust control measures around road-header drivers in mining excavation roadways

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Particuology 2021年第5期19卷 268-275页

作者： Shengyong Hu Yang Gao Guorui Feng Yisheng Huang He Shaoa Qi Liao Fei Hu College of Safety and Emergency Management engineering Taiyuan University of TechnologyTaiyuan 030024China College of mining engineering Taiyuan University of TechnologyTaiyuan 030024China Green Mining Engineering Technology Research Center of Shanxi Province Taiyuan 030024China

In the present study,a numerical simulation method was adopted in order to examine the characteristics of dust dispersion during continuous dust release periods(CRP)and stop dust release periods(SRP).The purpose was to analyze the dust distributions and migration actions around road-header drivers in excavation roadways,and then determine effective dust control measures for underground coal mines.This study’s simulation results showed that the dust concentrations continuously increased,and then gradually reached a stability level during the CRP.During that time,the locations of the drivers were always at the intersection of the original migration dust and the backflow dust,and the drivers were invaded by these two strands dust.However,during the SRP,the dust concentrations gradually decreased under the actions of the roadway ventilation.Besides,obvious backflow phenomena were observed around the road-header during the SRP.The locations of the drivers were still within the backflow paths of the high dust concentrations.At the present time,dust separation and extraction systems have been implemented in coal mines,including vacuuming and air knife devices,which are designed to control the dust around the road-header drivers.The field applications of these systems were conducted in the 26 mechanized excavation faces of the Zhangcun Coal Mine.The results revealed that the use of these dust removal systems could effectively reduce the dust concentrations around the road-header drivers.In the present study,the dust removal rates during the CRP and SRP were determined to reach up to 88.7% and 94.6%,respectively.Therefore,the results of this research study provided effective theoretical guidance of the characteristics of dust distributions in coal mines,and introduced effective control methods for the hazardous dust concentrations around road-header drivers during the excavation process.

关键词： Excavation roadway Road-header driver Dust distribution Dust control Numerical simulation

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分级加载养护对矸石胶结充填柱力学和变形性能的影响

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Journal of Central South University 2020年第11期27卷 3417-3435页

作者：郭育霞冉洪宇冯国瑞杜献杰戚庭野王泽华 College of mining engineering Taiyuan University of TechnologyTaiyuan 030024China shanxi province research Centre of green mining engineering technology Taiyuan 030024China Institute of mining technology Taiyuan University of TechnologyTaiyuan 030024China

利用分级加载来模拟采空区矸石胶结充填柱硬化过程中的加载历史。通过电阻率和超声设备监测试件在硬化期间和单轴压缩测试期间的内部损伤。结果表明:1)加压硬化试件32 d的单轴抗压强度和弹性模量高于无压力硬化的对照试件,分别为对照试... 详细信息

利用分级加载来模拟采空区矸石胶结充填柱硬化过程中的加载历史。通过电阻率和超声设备监测试件在硬化期间和单轴压缩测试期间的内部损伤。结果表明:1)加压硬化试件32 d的单轴抗压强度和弹性模量高于无压力硬化的对照试件,分别为对照试件的0.5%~20.2%和7.1%~52.3%,且受初始加载龄期和应力-强度比的影响;硬化期间施加在矸石胶结充填柱上的应力-强度比不应超过80%。2)初始加载龄期越早,总变形越大,应力-强度比越高,总应变越大;蠕变应变随着应力-强度比的增加而增加,且可以用Burgers黏弹性蠕变模型来描述;当应力-强度比小于80%时,初始加载龄期越早,最后一步加载后的蠕变应变就越小。3)可以根据超声波脉冲速度和电阻率的变化来监测早龄期矸石胶结充填柱在压力下的稳定性。

关键词：矸石胶结充填柱分级加载养护抗压强度弹性模量变形

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Progress and prospects of mining with backfill in metal mines in China

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International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1455-1473页

作者： Gaili Xue Erol Yilmaz Yongding Wang College of mining technology Taiyuan University of TechnologyTaiyuan030024China research center of green mining engineering technology in shanxi province Taiyuan030024China Department of Civil engineering Geotechnical DivisionRecep Tayyip Erdogan UniversityFenerRizeTR53100Turkey Longshou Mine Jinchuan Group Co.Ltd.Jinchuan737100China

mining is the foundation of modern industrial development.In the context of the“carbon peaking and carbon neutrality”era,countries have put forward the development strategy of“adhering to the harmonious coexistence of humans and nature.”The ongoing progress and improvement of filling mining technology have provided significant advantages,such as“green mining,safe,efficient,and low-carbon emission,”which is crucial to the comprehensive utilization of mining solid waste,environmental protection,and safety of re-mining.This review paper describes the development history of metal mine filling mining in China and the characteristics of each stage.The excitation mechanism and current research status of producing cementitious materials from blast furnace slag and other industrial wastes are then presented,and the concept of developing cementitious materials for backfill based on the whole solid waste is proposed.The advances in the mechanical characteristics of cemented backfill are elaborated on four typical levels:static mechanics,dynamic mechanics,mechanical influencing factors,and multi-scale mechanics.The working/rheological characteristics of the filling slurry are presented,given the importance of the filling materials conveying process.Finally,the future perspectives of mining with backfill are discussed based on the features of modern filling concepts to provide the necessary theoretical research value for filling mining.

关键词： mining with backfill cementitious materials mechanical characteristics slurry properties future perspectives

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酸性矿井水环境中矸石胶结充填体的强度演化及劣化规律（英文）

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Journal of Central South University 2024年第5期 1560-1573页

作者：赵永辉郭育霞冯国瑞 College of mining engineering Taiyuan University of Technology shanxi province research Centre of green mining engineering technology shanxi province Coal-based Resources green and High-efficiency Development engineering center shanxi-Zheda Institute of Advanced Materials and Chemical engineering

矸石胶结充填开采是一种重要的充填开采方法，然而，酸性矿井水会严重影响矸石胶结充填体的强度。在本研究中，将矸石胶结充填体试件分别置于不同环境(空气、水、硫酸溶液、硫酸与荷载耦合)中，测试了不同龄期试件的抗压强度、电阻率及... 详细信息

矸石胶结充填开采是一种重要的充填开采方法，然而，酸性矿井水会严重影响矸石胶结充填体的强度。在本研究中，将矸石胶结充填体试件分别置于不同环境(空气、水、硫酸溶液、硫酸与荷载耦合)中，测试了不同龄期试件的抗压强度、电阻率及超声波波速，监测了加载过程中试件的声发射能量数值，同时结合扫描电镜和X衍射分析不同龄期充填体的微观结构。结果表明，1)空气中与水中养护的充填体抗压强度的增长趋势随龄期的增加而逐渐减缓。硫酸溶液中的充填体强度在前90天大于空气及水中养护的充填体强度。硫酸溶液与荷载耦合作用下充填体的强度随龄期的下降速率比单一硫酸溶液作用的较为缓慢；2)不同龄期矸石胶结充填体电阻率与超声波波速与强度有较好的对应关系。受侵蚀后矸石胶结充填体的破坏形式较为多样，且在加载不同阶段表现出不同的声发射能量特征，可以将声发射能量激增作为充填体的破坏前兆；3)侵蚀产物前期填充充填体内部孔隙，提高了其强度，后期会导致充填体膨胀开裂，强度降低。施加40%应力强度比的荷载会抵抗硫酸溶液的侵蚀。本文研究结果可以为充填体的耐侵蚀设计提供参考。

关键词：酸性矿井水矸石胶结充填体劣化规律电阻率超声波波速声发射能量微观结构

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不同高径比煤岩单轴压缩破坏过程的应力-应变-声发射响应

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Journal of Central South University 2021年第6期28卷 1724-1736页

作者：郭育霞赵永辉王胜伟冯国瑞张玉江冉洪宇 College of mining engineering Taiyuan University of TechnologyTaiyuan 030024China shanxi province research Centre of green mining engineering technology Taiyuan 030024China

遗留煤柱在相邻煤层安全开采、采空区管理和维护废弃矿井稳定性等方面发挥着重要作用。高径比影响着遗留煤柱的稳定性。本文对5种高径比(2.0,1.5,1.0,0.8和0.6)的煤样进行了单轴压缩试验,并对应力、应变和声发射进行了监测。结果表明,... 详细信息

遗留煤柱在相邻煤层安全开采、采空区管理和维护废弃矿井稳定性等方面发挥着重要作用。高径比影响着遗留煤柱的稳定性。本文对5种高径比(2.0,1.5,1.0,0.8和0.6)的煤样进行了单轴压缩试验,并对应力、应变和声发射进行了监测。结果表明,随着高径比的减小,煤样的单轴抗压强度和峰值应变均增大。提出了一个用以描述单轴抗压强度和高径比关系的经验方程。煤样破坏过程中的声发射活动可被划分为四个时期,静默期和快速衰弱期的时长与高径比呈正相关。高径比越小,煤样的破坏特征越复杂,当高径比为2.0,1.5,1.0时,破坏形式以剪切破坏为主,而当高径比为0.8,0.6时,破坏形式以轴向劈裂破坏为主。声发射事件点的实时空间演化可以反映微裂隙的萌生、扩展、聚集和联通。

关键词：遗留煤柱高径比单轴压缩声发射微裂隙演化

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Experimental study of the dust-removal performance of a wet scrubber

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International Journal of Coal Science & technology 2021年第2期8卷 228-239页

作者： Shengyong Hu Yang Gao Guorui Feng Fei Hu Changhe Liu Jihua Li College of Safety and Emergency Management engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina College of mining engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Green Mining Engineering Technology Research Center of Shanxi Province Taiyuan 030024ShanxiChina Shandong New Sunshine Environmental Protection Equipment Co. Ltd.Zoucheng 273500ShandongChina

A variety of dust control methods are often applied in coal mines,among which the application of wet scrubbers has proven to be an efficient technology for the removal of dust in airstreams,rather than diluting or confining the dust.In this paper,a wet scrubber design was developed.Based on a self-designed experimental test platform,the total dust concentration,respirable dust concentration,air volume,and average pressure drops of wet scrubbers with 12,16,20,and 24 blades were measured under different water intake conditions.The results show that the different water intake levels have only minimal effects on the air volume of the wet scrubbers.However,increased water intake had improved the dust removal efficiency of the wet scrubbers with the same number of blades.The wet scrubber with 16 blades was found to have the best dust removal efficiency at a water intake level of 1.35 m^(3)/h.Its total dust and respirable dust removal efficiency reached 96.81%and 95.59%,respectively.The air volume was 200.4 m^(3)/min,and the average pressure drop was determined to be 169.4 Pa.In addition,when the wet scrubber with 16 blades was applied in a coal preparation plant in China's shanxi province,it was observed that the total dust concentration had fallen below 8.1 mg/m^(3),and the respirable dust concentration had fallen below 5.9 mg/m^(3).Therefore,the results obtained in this research investigation provide important references for the use of wet scrubbers to improve coal production environmental conditions.

关键词： Coal mine Coal dust Dust removal Performance of wet scrubber

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