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Damage degradation mechanism and macro-meso structural response of mudstone after water wetting

Journal of Mountain Science 2024年第8期21卷 2825-2843页

作者： SHAO Zhixin SONG Yanqi ZHENG Junjie SHEN Fuxin LIU Chuanpeng YANG Juntao School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China state key laboratory of coal resources and safe mining China University of Mining&Technology(Beijing)Beijing 100083China

The predominant presence of weak interlayers primarily composed of mudstone renders them highly susceptible to a reduction in bearing capacity due to the water-rock weakening effect,significantly impacting the safety of open-pit mining *** study focuses on the weak mudstone layers within open-pit mine *** mineral composition of mudstone and the microstructure evolution characteristics before and after water wetting were analyzed by X-ray diffraction(XRD)and scanning electron microscope(SEM).The meso-structure and parameter variation characteristics of mudstone interior space after water-rock interaction were quantified by computed tomography scanning test,and the damage variable characterization method was ***,according to the uniaxial compression test,the degradation characteristics of the macroscopic mechanical behavior of mudstone under different water wetting time were explored,and the elastic modulus and strength attenuation model of mudstone based on mesoscopic damage were ***,building upon the macro-meso structural response characteristics of mudstone,an exploration of the failure characteristics and deterioration mechanism under the influence of water-rock interactions was *** results show that the water-rock interaction makes the internal defects of mudstone gradually develop and form a fracture network structure,which eventually leads to the deterioration of its macroscopic mechanical *** porosity,fractal dimension and damage characteristics of mudstone show an exponential trend with the increase of water wetting ***,the deterioration mechanism of mudstone after water wetting are postulated to encompass factors such as the hydrophilicity of mineral molecular structures,hydration stress and expansion effects on clay particles,as well as the spatial distribution of microcracks and the phenomenon of fracture *** outcomes of this research endeavor aim to provide cer

关键词： Moisture absorption of mudstone Computed tomography scanning test Fracture structure evolution Macro-meso structural response Deterioration mechanism

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Experimental investigation on coal pore-fracture variation and fractal characteristics synergistically affected by solvents for improving clean gas extraction

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International Journal of mining Science and Technology 2024年第3期34卷 413-425页

作者： Feilin Han Sheng Xue Chunshan Zheng Zhongwei Chen Guofu Li Bingyou Jiang key laboratory of safe and Effective coal mining of Ministry of Education Anhui University of Science and TechnologyHuainan 232001China School of safety Science and Engineering Anhui University of Science and TechnologyHuainan 232001China School of Mechanical and mining Engineering University of QueenslandQLD 4072Australia state key laboratory of coal and coalbed Methane Co-mining Jincheng 048012China

Chemical solvents instead of pure water being as hydraulic fracturing fluid could effectively increase permeability and improve clean methane extraction ***,pore-fracture variation features of lean coal synergistically affected by solvents have not been fully *** testing,nuclear magnetic resonance analysis,liquid phase mass spectrometry was adopted to comprehensively analyze pore-fracture change characteristics of lean coal treated by combined solvent(NMP and CS_(2)).Meanwhile,quantitative characterization of above changing properties was conducted using geometric fractal *** model between permeability,fractal dimension and porosity were *** indicate that the end face fractures of coal are well developed after CS2and combined solvent treatments,of which,end face box-counting fractal dimensions range from 1.1227 to *** decreases in ultrasonic longitudinal wave velocity of coal affected by NMP,CS_(2)and combined solvent are 2.700%,20.521%,22.454%,*** treatments could lead to increasing amount of both mesopores and *** ratio of fractal dimension Dsis 0.259%–2.159%,while permeability increases ratio of NMR ranges from 0.1904 to ***,combined solvent could dissolve coal polar and non-polar small molecules and expand flow *** could provide reference for solvent selection and parameter optimization of permeability-enhancement technology.

关键词： Clean gas extraction Chemical solvent Experimental investigation Fractal characteristics Pore fracture

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Identifying the real fracture hidden in rock microcrack zone by acoustic emission energy

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International Journal of mining Science and Technology 2024年第6期34卷 731-746页

作者： Yuekun Xing Bingxiang Huang Guangqing Zhang Binghong Li Hang Xu Xuejie Jiao Yang Yu Taisen Han Jinlong Chen state key laboratory for Fine Exploration and Intelligent Development of coal resources China University of Mining and TechnologyXuzhou 221116China state key laboratory of Petroleum resources and Engineering China University of Petroleum-BeijingBeijing 102249China

Identifying the real fracture of rock hidden in acoustic emission(AE)source clusters(AE-depicted microcrack zone)remains challenging and *** we revealed the AE energy(representing dissipated energy)distribution rule in the rock microcrack zone and proposed an AE-energy-based method for identifying the real fracture.(1)A set of fracture experiments were performed on granite using wedgeloading,and the fracture process was detected and recorded by *** microcrack zone associated with the energy dissipation was characterized by AE sources and energy distribution,utilizing our selfdeveloped AE analysis program(RockAE).(2)The accumulated AE energy,an index representing energy dissipation,across the AE-depicted microcrack zone followed the normal distribution model(the mean and variance relate to the real fracture path and the microcrack zone width).This result implies that the nucleation and coalescence of massive cracks(i.e.,real fracture generation process)are supposed to follow a normal distribution.(3)Then,we obtained the real fracture extension path by joining the peak positions of the AE energy normal distribution curve at different cross-sections of the microcrack ***,we distinguished between the microcrack zone and the concealed real fracture within *** deviation was validated as slight as 1–3 mm.

关键词： GeoEnergy exploitation Rock fracture Fracture identification Acoustic emission AE energy analysis

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Damage degradation mechanism and macro-meso structural response of mudstone after water wetting

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Journal of Mountain Science 2024年第8期 2825-2843页

作者： SHAO Zhixin SONG Yanqi ZHENG Junjie SHEN Fuxin LIU Chuanpeng YANG Juntao School of Mechanics and Civil Engineering China University of Mining and Technology (Beijing) state key laboratory of coal resources and safe mining China University of Mining & Technology (Beijing)

The predominant presence of weak interlayers primarily composed of mudstone renders them highly susceptible to a reduction in bearing capacity due to the water-rock weakening effect, significantly impacting the safety of open-pit mining operations. This study focuses on the weak mudstone layers within open-pit mine slopes. The mineral composition of mudstone and the microstructure evolution characteristics before and after water wetting were analyzed by X-ray diffraction(XRD) and scanning electron microscope(SEM). The mesostructure and parameter variation characteristics of mudstone interior space after water-rock interaction were quantified by computed tomography scanning test, and the damage variable characterization method was proposed. Additionally, according to the uniaxial compression test, the degradation characteristics of the macroscopic mechanical behavior of mudstone under different water wetting time were explored, and the elastic modulus and strength attenuation model of mudstone based on mesoscopic damage were established. Finally, building upon the macro-meso structural response characteristics of mudstone, an exploration of the failure characteristics and deterioration mechanism under the influence of waterrock interactions was undertaken. The results show that the water-rock interaction makes the internal defects of mudstone gradually develop and form a fracture network structure, which eventually leads to the deterioration of its macroscopic mechanical properties. The porosity, fractal dimension and damage characteristics of mudstone show an exponential trend with the increase of water wetting time. Moreover, the deterioration mechanism of mudstone after water wetting are postulated to encompass factors such as the hydrophilicity of mineral molecular structures, hydration stress and expansion effects on clay particles, as well as the spatial distribution of microcracks and the phenomenon of fracture adsorption. The outcomes of this research endeavo

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Identifying the real fracture hidden in rock microcrack zone by acoustic emission energy

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International Journal of mining Science and Technology 2024年第6期 731-746页

作者： Yuekun Xing Bingxiang Huang Guangqing Zhang Binghong Li Hang Xu Xuejie Jiao Yang Yu Taisen Han Jinlong Chen state key laboratory for Fine Exploration and Intelligent Development of coal resources China University of Mining and Technology state key laboratory of Petroleum resources and Engineering China University of Petroleum-Beijing

Identifying the real fracture of rock hidden in acoustic emission(AE) source clusters(AE-depicted microcrack zone) remains challenging and crucial. Here we revealed the AE energy(representing dissipated energy) distribution rule in the rock microcrack zone and proposed an AE-energy-based method for identifying the real fracture.(1) A set of fracture experiments were performed on granite using wedgeloading, and the fracture process was detected and recorded by AE. The microcrack zone associated with the energy dissipation was characterized by AE sources and energy distribution, utilizing our selfdeveloped AE analysis program(Rock AE).(2) The accumulated AE energy, an index representing energy dissipation, across the AE-depicted microcrack zone followed the normal distribution model(the mean and variance relate to the real fracture path and the microcrack zone width). This result implies that the nucleation and coalescence of massive cracks(i.e., real fracture generation process) are supposed to follow a normal distribution.(3) Then, we obtained the real fracture extension path by joining the peak positions of the AE energy normal distribution curve at different cross-sections of the microcrack ***, we distinguished between the microcrack zone and the concealed real fracture within it. The deviation was validated as slight as 1–3 mm.

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The extraction of effective components and an antioxidant activity study of Tulipa edulis

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Food Science and Human Wellness 2024年第1期13卷 276-286页

作者： Doudou Zhang Dong Xiao Tingting Yin Shuangzhi Zhao Olena Zhur Xun Xiao Hailun He Leilei Chen Beijing Advanced Innovation Center for Food Nutrition and Human Health Beijing Technology and Business UniversityBeijing 102488China School of Life Sciences Central South UniversityChangsha 410013China state key laboratory of coal resources and safe mining University of Mining and TechnologyXuzhou 221116China Institute of Agro-Food Science and Technology Shandong Academy of Agricultural SciencesJinan 250100China

Plant extracts from natural sources are an excellent choice for food additives and natural *** this study,the active components of Tulipa edulis were extracted and analysed,and their antioxidant capacity was ***,the crude extract mixture was separated and purified using a Sephadex LH-20 gel,and the antioxidant activity of the purified products was *** umbilical vein endothelial human umbilical vein endothelial cells(HUVEC)cells were treated with 35 mmol/L glucose to construct a model of oxidative ***,the cells were treated with the active component to observe whether the products of *** could have a good protective effect on HUVEC cells induced by *** analysis was also performed on HUVEC cells after same treatment to explore the possible mechanism of the component F2 protecting HUVEC cells from oxidative stress induced by high *** results showed that component F2 obtained from *** has strong antioxidant ***,F2 can play a strong antioxidant protective role in HUVEC ***,the gene expression of heme oxygenase 1(HO-1),γ-glutamyl cysteine ligase catalytic subunit(GCLC)and NAD(P)H quinone oxidoreductase-1(NQO1)in HUVEC cells was up-regulated after treated with *** study provides reference value for the further development and application of *** and the d evelopment of functional food.

关键词： Tulipa edulis Oxidative stress Purification Antioxidant

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Responses of soil stoichiometry and soil enzyme activities in the different distance around opencast coal mine of the Hulun Buir Grassland of China

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International Journal of coal Science & Technology 2024年第1期11卷 221-231页

作者： Yinli Bi Nan Guo Yanxu Zhang Xianglei Li Ziheng Song state key laboratory for Fine Exploration and Intelligent Development of coal resources China University of Mining and Technology(Beijing)Beijing100083China Institute of Ecological Environment Restoration in Mine Areas of West China Xi’an University of Science and TechnologyXi’an710054China

The objectives of this study were to explore the changes in soil stoichiometry and enzyme activities at different distances from an opencast coal mine in the Hulun Buir Grassland of China. Four transects were established on north and east sides of the opencast coal mining area, and samples were collected at 50 m, 550 m, and 1550 m from the pit on each transect. Control samples were collected from a grassland station 8 km from the opencast coal mining area that was not disturbed by mining. Four replicate soil samples were collected at each point on the four transects. Soil physicochemical properties and enzyme activities were determined, and correlations between soil properties and stoichiometric ratios and enzyme activities were explored using redundancy analysis. The increase in distance from mining did not significantly affect soil properties, although soil urease activity was significantly lower than that of the control area. Soil properties 1550 m from the mine pit were similar to those at the grassland control. In addition, soil total nitrogen had the greatest effect on soil stoichiometry, and soil total potassium had the greatest effect on soil enzyme activities. coal dust from opencast mining might be the main factor affecting soil stoichiometry and enzyme activities. The results of this study provide direction for the next step in studying the influence of mining areas on soil properties and processes.

关键词： Opencast coal mine Soil stoichiometry Soil enzyme activities Distance Grassland

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AMicroseismic Signal Denoising Algorithm Combining VMD and Wavelet Threshold Denoising Optimized by BWOA

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 187-217页

作者： Dijun Rao Min Huang Xiuzhi Shi Zhi Yu Zhengxiang He Zijin mining Group Co. Ltd.Xiamen361016China Zijin(Changsha)Engineering Technology Co. Ltd.Changsha410006China state key laboratory of Comprehensive Utilization of Low-Grade Refractory Gold Ores Shanghang364204China School of resources and safety Engineering Central South UniversityChangsha410083China School of resources&Environment Engineering Jiangxi University of Science and TechnologyGanzhou341000China Zijin School of Geology and mining Fuzhou UniversityFuzhou350116China state key laboratory for Fine Exploration and Intelligent Development of coal resources China University of Mining and TechnologyXuzhou221116China

The denoising of microseismic signals is a prerequisite for subsequent analysis and *** this research,a new microseismic signal denoising algorithm called the Black Widow Optimization Algorithm(BWOA)optimized VariationalMode Decomposition(VMD)jointWavelet Threshold Denoising(WTD)algorithm(BVW)is *** BVW algorithm integrates VMD and WTD,both of which are optimized by ***,this algorithm utilizes VMD to decompose the microseismic signal to be denoised into several Band-Limited IntrinsicMode Functions(BLIMFs).Subsequently,these BLIMFs whose correlation coefficients with the microseismic signal to be denoised are higher than a threshold are selected as the effective mode functions,and the effective mode functions are denoised using WTD to filter out the residual low-and intermediate-frequency ***,the denoised microseismic signal is obtained through *** ideal values of VMD parameters and WTD parameters are acquired by searching with BWOA to achieve the best VMD decomposition performance and solve the problem of relying on experience and requiring a large workload in the application of the WTD *** outcomes of simulated experiments indicate that this algorithm is capable of achieving good denoising performance under noise of different intensities,and the denoising performance is significantly better than the commonly used VMD and Empirical Mode Decomposition(EMD)*** BVW algorithm is more efficient in filtering noise,the waveform after denoising is smoother,the amplitude of the waveform is the closest to the original signal,and the signal-to-noise ratio(SNR)and the root mean square error after denoising are more *** case based on Fankou Lead-Zinc Mine shows that for microseismic signals with different intensities of noise monitored on-site,compared with VMD and EMD,the BVW algorithm ismore efficient in filtering noise,and the SNR after denoising is higher.

关键词： Variational mode decomposition microseismic signal denoising wavelet threshold denoising black widow optimization algorithm

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Physical and numerical investigations of target stratum selection for ground hydraulic fracturing of multiple hard roofs

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International Journal of mining Science and Technology 2024年第5期34卷 699-712页

作者： Binwei Xia Yanmin Zhou Xingguo Zhang Lei Zhou Zikun Ma state key laboratory of coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China School of resources and safety Engineering Chongqing UniversityChongqing 400044China

Ground hydraulic fracturing plays a crucial role in controlling the far-field hard roof,making it imperative to identify the most suitable target stratum for effective *** experiments are conducted based on engineering properties to simulate the gradual collapse of the roof during longwall top coal caving(LTCC).A numerical model is established using the material point method(MPM)and the strain-softening damage constitutive model according to the structure of the physical *** simulations are conducted to analyze the LTCC process under different hard roofs for ground hydraulic *** results show that ground hydraulic fracturing releases the energy and stress of the target stratum,resulting in a substantial lag in the fracturing of the overburden before collapse occurs in the hydraulic fracturing *** hydraulic fracturing of a low hard roof reduces the lag effect of hydraulic fractures,dissipates the energy consumed by the fracture of the hard roof,and reduces the abutment ***,it is advisable to prioritize the selection of the lower hard roof as the target stratum.

关键词： Target stratum selection Ground hydraulic fracturing Hard roof control Fracture network Material point method

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基于LCEM-GFEM方法爆炸载荷作用下含缺陷岩体损伤机理研究

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Journal of Central South University 2024年第2期31卷 496-510页

作者：陈勇王应朋杨玉贵孙文凯孟宁康 state key laboratory for Fine Exploration and Intelligent Development of coal resources China University of Mining and TechnologyXuzhou 221116China China coal Consultant International Beijing 100010China state key laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221008China

在爆破作业过程中,岩体缺陷对裂纹扩展具有显著影响。本研究基于全局有限元方法的局部黏结单元(LCEM-GFEM)方法构建数值模拟模型,研究爆破作用下含缺陷岩体的损伤演化和裂纹扩展模式。通过引入能量传递系数,定量分析了缺陷形态对应力波... 详细信息

在爆破作业过程中,岩体缺陷对裂纹扩展具有显著影响。本研究基于全局有限元方法的局部黏结单元(LCEM-GFEM)方法构建数值模拟模型,研究爆破作用下含缺陷岩体的损伤演化和裂纹扩展模式。通过引入能量传递系数,定量分析了缺陷形态对应力波传播和衰减的影响。结果表明,缺陷形态对岩体的损伤特性和裂纹扩展具有显著影响。随着平行缺陷夹角的增加,爆破诱发的裂缝与衍生裂缝的合并路径从缺陷末端转移到了缺陷中间,能量传递系数增加,分形维度减小。随着平行缺陷之间的水平距离增加,平行缺陷之间的裂缝数目和能量传递系数相应减少。随着垂直缺陷之间的垂直距离增加,穿过缺陷C的主水平裂缝长度增加,能量传递系数和分形维度也增加。研究结果可为受到爆破荷载作用下含缺陷岩体的损伤特征提供指导。

关键词：缺陷岩体 LCEM-GFEM方法裂纹扩展 Cohesive单元分形理论

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