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Nickel-based metal-organic framework-derived whisker-shaped nickel phyllosilicate toward efficiently enhanced mechanical,flammable and tribological properties of epoxy nanocomposites

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Frontiers of Chemical Science and Engineering 2022年第10期16卷 1493-1504页

作者： Yuxuan Xu Guanglong Dai Shibin Nie Jinian Yang Song Liu Hong Zhang Xiang Dong School of Safety Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China School of Materials Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China

Metal−organic framework-derived materials have attracted significant attention in the applications of functional materials.In this work,the rod-like nickel-based metal−organic frameworks were first synthesized and subsequently employed as the hard templates and nickel sources to prepare the whisker-shaped nickel phyllosilicate using a facile hydrothermal technology.Then,the nickel phyllosilicate whiskers were evaluated to enhance the mechanical,thermal,flammable,and tribological properties of epoxy resin.The results show that adequate nickel phyllosilicate whiskers can disperse well in the matrix,improving the tensile strength and elastic modulus by 13.6%and 56.4%,respectively.Although the addition of nickel phyllosilicate whiskers could not obtain any UL-94 ratings,it enhanced the difficulty in burning the resulted epoxy resin nanocomposites and considerably enhanced thermal stabilities.Additionally,it was demonstrated that such nickel phyllosilicate whiskers preferred to improve the wear resistance instead of the antifriction feature.Moreover,the wear rate of epoxy resin nanocomposites was reduced significantly by 80%for pure epoxy resin by adding 1 phr whiskers.The as-prepared nickel phyllosilicate whiskers proved to be promising reinforcements in preparing of high-performance epoxy resin nanocomposites.

关键词： metal−organic framework nickel phyllosilicate whisker epoxy resin mechanical response tribological performance flammable property

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Self-sacrificial templating synthesis of flower-like nickel phyllosilicates and its application as high-performance reinforcements in epoxy nanocomposites

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Frontiers of Chemical Science and Engineering 2022年第4期16卷 484-497页

作者： Jinian Yang Xuesong Feng Shibin Nie Yuxuan Xu Zhenyu Li School of Materials Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China School of Safety Science and Engineering State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal MinesAnhui University of Science and TechnologyHuainan 232001China

The nanocomposites of flower-like nickel phyllosilicate particles incorporated into epoxy resin were fabricated via an in-situ mixing process.The flower-like nickel phyllosilicate particles were firstly synthesized using a mild self-sacrificial templating method,and the morphology and lamellar structure were examined carefully.Several properties of mechanical,thermal and tribological responses of epoxy nanocomposites were performed.It was demonstrated that adequate flower-like nickel phyllosilicate particles dispersed well in the matrix,and the nanocomposites displayed enhanced tensile strength and elastic modulus but decreased elongation at break as expected.In addition,friction coefficient and wear rate were increased first and then decreased along with the particle content,and showed the lowest values at a mass fraction of 5%.Nevertheless,the incorporated flower-like nickel phyllosilicate particles resulted in the continuously increasing thermal stability of epoxy resin(EP)nanocomposites.This study revealed the giant potential of flower-like particles in preparing high-quality EP nanocomposites.

关键词： nickel phyllosilicate flow-like structure mechanical property thermal stability tribological performance

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Numerical Simulation of Dust Removal in the Cyclone Collector of a Straw Crusher Based on a Discrete Phase Model

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Fluid Dynamics & Materials Processing 2023年第5期19卷 1143-1157页

作者： Zhuang Wu Chang Su Hua Xu Liu Wang State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine Anhui University of Science and TechnologyHuainan232001China School of Mechanical Engineering Anhui University of Science and TechnologyHuainan232001China

The cyclone dust collector is an important subsystem of straw crushers used in agriculture.In the present study,a new type of dust collector with involute morphology is proposed to obtain better dust removal efficiency with respect to that of classical tangential and spiral dust collectors.A discrete phase model(DPM)method is used in synergy with a turbulence model,and the SIMPLE algorithm to simulate the flow field inside the dust collector and the related particle dynamics.It is shown that the internal flow field features a primary swirl,a secondary swirl and blockage effects.Moreover,for the involute dust collector,the tangential velocity in the initial stage and the pressure in the high-pressure area are larger than those obtained for the classical types.The dust removal efficiency is 37.11%,25.3%,and 16.37%for the involute type dust collector,the tangential type and the spiral type,respectively.

关键词： Cyclone dust collector the involute type efficiency of dust removal numerical simulation

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Prospects for the transformation and development of carbon storage in abandoned mines of coal enterprises from the perspective ofcarbon neutrality

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International Journal of coal Science & Technology 2023年第3期10卷 24-40页

作者： Xin Lyu Tong Zhang Liang Yuan Juejing Fang State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China Institute of Energy Hefei Comprehensive National Science CenterHefei230031China

Under the carbon neutrality goal,coal enterprises must seek breakthroughs from abandoned mines,develop new resources in the new era,turn problems into countermeasures,and participate in the carbon emissions market,for contributing to the accomplishment of the national strategic goal of carbon neutrality.To this end,we investigated the relevant national policies and regulations to clarify the boundaries disclosed by the carbon information of enterprises,understood the development direction of carbon storage in abandoned mines,and clarified the transformation and development of carbon storage in aban-doned mines.We made a few suggestions:(1)China should learn from its past experience and other countries to develop the energy industry with Chinese characteristics and reform the economic system.(2)coal enterprises must actively respond to the national carbon information disclosure policy,clarify their own responsibilities and carbon emission boundaries.(3)It is necessary to proactively obtain advanced knowledge and plan carbon storage pathways for abandoned mines.(4)Devel-opment problems of coal enterprises should be deduced using cases.The'dual carbon'goals should be achieved steadily step-by-step.(5)Three measures,i.***.improving the existing resource structure,coordinating the information of abandoned mines,and promoting the cultivation of scientific and technological talents.

关键词： mining engineering Abandoned mines Carbon neutrality Carbon emission rights Carbon tax

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Mechanical responses and acoustic emission behaviors of coal under compressive differential cyclic loading(DCL):a numerical study via 3D heterogeneous particle model

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International Journal of coal Science & Technology 2023年第3期10卷 136-154页

作者： Zhengyang Song Yunfeng Wu Yong Zhang Yi Yang Zhen Yang state key laboratory of Water Resource Protection and Utilization in coal mining BeijingChina Department of Civil Engineering University of Science&Technology BejingBeijing 100083China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China

The stability of coal walls(pillars)can be seriously undermined by diverse in-situ dynamic disturbances.Based on a 3D par-ticle model,this work strives to numerically replicate the major mechanical responses and acoustic emission(AE)behaviors of coal samples under multi-stage compressive cyclic loading with different loading and unloading rates,which is termed differential cyclic loading(DCL).A Weibull-distribution-based model with heterogeneous bond strengths is constructed by both considering the stress-strain relations and AE parameters.Six previously loaded samples were respectively grouped to indicate two DCL regimes,the damage mechanisms for the two groups are explicitly characterized via the time-stress-dependent variation of bond size multiplier,and it is found the two regimes correlate with distinct damage patterns,which involves the competition between stiffness hardening and softening.The numerical b-value is calculated based on the mag-nitudes of AE energy,the results show that both stress level and bond radius multiplier can impact the numerical b-value.The proposed numerical model succeeds in replicating the stress-strain relations of lab data as well as the elastic-after effect in DCL tests.The effect of damping on energy dissipation and phase shift in numerical model is summarized.

关键词： Differential cyclic loading(DCL) Particle model Acoustic emission(AE) Discrete element method(DEM)Damage mechanism

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真三轴应力状态下含预制裂隙煤系泥岩强度与破坏特征

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Journal of Central South University 2024年第1期31卷 196-209页

作者：李文帅蒋邦友李兆霖王连国杨旭旭 Shandong key laboratory of Civil Engineering disaster prevention and Mitigation Shandong University of Science and TechnologyQingdao 266590China College of Energy and mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China state key laboratory for Geomechanics and deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China

对一系列含有预制缺陷的煤系泥岩试样进行了真三轴试验(TTT),即中间主应力(σ_(2))平行于预制缺陷的试样(TTT-Flaw-2)和最小主应力平行于预制缺陷的试样(σ_(3))(TTT-Flaw-3),研究σ_(2)加载方向和预制缺陷的位置对试样强度和破坏模式... 详细信息

对一系列含有预制缺陷的煤系泥岩试样进行了真三轴试验(TTT),即中间主应力(σ_(2))平行于预制缺陷的试样(TTT-Flaw-2)和最小主应力平行于预制缺陷的试样(σ_(3))(TTT-Flaw-3),研究σ_(2)加载方向和预制缺陷的位置对试样强度和破坏模式的影响。结果表明,完整试样和含预制缺陷试样的峰值强度随σ_(2)的增加先增大后减小,符合Mogi-Coulomb准则。在相同的应力条件下,完整试样的强度明显大于含预制缺陷试样的强度,且TTT-Flaw-2试样的强度最低。CT扫描结果显示,在常规三轴试验条件下,含预制缺陷试样中的裂纹并不总是沿着预制缺陷尖端形成,而是随机分布在试样内部;在TTT-Flaw-2试样中,反翼型裂纹从预制缺陷尖端附近开始形成,最终主要分布在σ_(2)加载方向上;而在TTT-Flaw-3试样中,在σ_(2)加载方向上出现剪切裂纹,而在σ_(3)加载方向上几乎没有观察到反翼型裂纹。

关键词：真三轴试验煤系泥岩预制缺陷强度破裂模式

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response characteristics of gas pressure under simultaneous static and dynamic load:Implication for coal and gas outburst mechanism

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International Journal of mining Science and Technology 2023年第2期33卷 155-171页

作者： Longyong Shu Liang Yuan Qixian Li Wentao Xue Nannan Zhu Zhengshuai Liu School of Energy and mining Engineering China University of Mining and Technology-BeijingBeijing 100083China mine Safety Technology Branch China Coal Research InstituteBeijing 100013China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science&TechnologyHuainan 232001China China coal Research Institute Beijing 100013China

coal and gas outbursts are dynamic disasters in which a large mass of gas and coal suddenly emerges in a mining space within a split second.The interaction between the gas pressure and stress environment is one of the key factors that induce coal and gas outbursts.In this study,first,the coupling relationship between the gas pressure in the coal body ahead of the working face and the dynamic load was investigated using experimental observations,numerical simulations,and mine-site investigations.It was observed that the impact rate of the dynamic load on the gas-bearing coal can significantly change the gas pressure.The faster the impact rate,the speedier the increase in gas pressure.Moreover,the gas pressure rise was faster closer to the impact interface.Subsequently,based on engineering background,we proposed three models of stress and gas pressure distribution in the coal body ahead of the working face:static load,stress disturbance,and dynamic load conditions.Finally,the gas pressure distribution and outburst mechanism were investigated.The high concentration of gas pressure appearing at the coal body ahead of the working face was caused by the dynamic load.The gas pressure first increased gradually to a peak value and then decreased with increasing distance from the working face.The increase in gas pressure plays a major role in outburst initiation by resulting in the ability to more easily reach the critical points needed for outburst initiation.Moreover,the stronger the dynamic load,the greater the outburst initiation risk.The results of this study provide practical guidance for the early warning and prevention of coal and gas outbursts.

关键词： coal and gas outburst Gas pressure Dynamic load Outburst mechanism

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Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the response Surface Method

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Journal of Renewable Materials 2022年第5期10卷 1439-1458页

作者： Guanfeng Chang Xinzhu Hua Xiao Liu Chen Li Enqian Wang Bingjun Sun State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan232001China

The filling mining method is important in realizing the green mining of mineral resources.Aiming at the problems of land resource occupation,environmental pollution,and rational utilization of coal-based solid wastes such as coal gangue,fly ash,and desulfurization gypsum,a new paste filling material was developed with coal gangue,fly ash,and desulfurization gypsum as raw materials.The microstructure of the raw materials was analyzed by XRD and SEM.Combined with the Box-Behnken experimental design,the effect of each component on the fluidity of the filling slurry was analyzed through the response surface analysis.The significance of each component on its bleeding and fluidity was determined,and the optimal ratio of the filling slurry was obtained.Experimental results show that the microcosmic morphology of coal gangue,desulfurization gypsum,and gasification slag presents an irregular block and rough particle surface;the microcosmic morphology of fly ash and bottom slag presents first out spherical or quasi spherical particles.Moreover,obvious sintering traces exist on the surface of the bottom slag.The main crystal mineral of coal gangue and fly ash is SiO_(2),the desulfurization gypsum is composed of Ca(SO_(4))(H_(2)O)and Ca(CO_(3))crystal minerals,the gasification slag is composed of carbon and nitrogen compounds,and the main crystal mineral components in the bottom slag sample are SiO_(2) and Al_(x)Si_(y)O_(z) compounds.The order of significance of each key factor on slurry fluidity is as follows:C(desulfurization gypsum)>D(gasification slag and bottom slag 1:1)>A(coal gangue)>B(fly ash).The order of the significance of each key factor on slurry bleeding is as follows:B(fly ash)>C(desulfurization gypsum)>D(gasification slag and bottom slag 1:1)>A(coal gangue).Considering the material preparation,field application,and other conditions,the mass percentage of each factor content of the new paste filling material is as follows:49.5%coal gangue,8.3%fly ash,4.1%desulfurization gypsum,6.2%gasification slag,and 6.2%bot

关键词： coal-based solid waste filling slurry flowability proportion optimization response surface method

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特厚煤层综放强采动巷道围岩应力演化特征:以塔山矿为例

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Journal of Central South University 2023年第11期30卷 3840-3854页

作者：严红李桂臣李永祺张庆超朱传奇 School of mines Key Laboratory of Deep Coal Resource MiningMinistry of Education of ChinaChina University of Mining and TechnologyXuzhou 221116China state key laboratory of mining response&disaster prevention&control in deep coal mines Anhui University of Science&TechnologyHuainan 232001China School of Civil Engineering Dalian University of TechnologyDalian 116024China

特厚煤层上下区段综放工作面两次开采形成的强采动应力易诱发煤与瓦斯突出、冒顶、塌陷等灾害,开展强采动应力演化和作用特征研究是关键。本文主要通过建立几何相似比1:100的物理模型,研究采动应力演化特征、强采动巷道围岩失稳机理和... 详细信息

特厚煤层上下区段综放工作面两次开采形成的强采动应力易诱发煤与瓦斯突出、冒顶、塌陷等灾害,开展强采动应力演化和作用特征研究是关键。本文主要通过建立几何相似比1:100的物理模型,研究采动应力演化特征、强采动巷道围岩失稳机理和高应力卸压方法。实验结果显示上下区段综放面两次开采过程中,特厚煤层综放强采动巷道煤柱帮均为所监测围岩区域中最剧烈影响区;结合室内相似材料物理模型和现场钻孔应力监测结果比较,验证了特厚煤层综放开采利用窄煤柱布置方法进行高应力卸压的可行性。研究结果可为特厚煤层开采中区段煤柱设计、巷道布置,支护方案等优化确定提供一定的理论参考基础。

关键词：特厚煤层强采动垂直应力两次顺序开采过程物理模型

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Application and prospects of 3D printing in physical experiments of rock mass mechanics and engineering:materials,methodologies and models

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International Journal of coal Science & Technology 2023年第1期10卷 1-17页

作者： Qingjia Niu Lishuai Jiang Chunang Li Yang Zhao Qingbiao Wang Anying Yuan state key laboratory of mining disaster preventionand control Shandong University of Scienceand TechnologyQingdao 266590China state key laboratory of mining response and disasterprevention and control in deep coal mines AnhuiUniversity of Science and TechnologyHuainan 232001China College of Resources Shandong University of Scienceand TechnologyTaian 271019China

The existence of joints or other kinds of discontinuities has a dramatic efect on the stability of rock excavations and engineering.As a result,a great challenge in rock mass mechanics testing is to prepare rock or rock-like samples with defects.In recent years,3D printing technology has become a promising tool in the feld of rock mass mechanics and engineering.This study frst reviews and discusses the research status of traditional test methods in rock mass mechanics tests of making rock samples with defects.Then,based on the comprehensive analysis of previous research,the application of 3D printing technology in rock mass mechanics is expounded from the following three aspects.The frst is the printing material.Although there are many materials for 3D printing,it has been found that 3D printing materials that can be used for rock mass mechanics research are very limited.After research,we summarize and evaluate printing material that can be used for rock mass mechanics studies.The second is the printing methodology,which mainly introduces the current application forms of 3D printing technology in rock mass mechanics.This includes printed precise casting molds and one-time printed samples.The last one is the printing model,which includes small-scale samples for mechanical tests and large-scale physical models.Then,the benefts and drawbacks of using 3D printing samples in mechanical tests and the validity of their simulation of real rock are discussed.Compared with traditional rock samples collected in nature or synthetic rock-like samples,the samples made by 3D printing technology have unique advantages,such as higher test repeatability,visualization of rock internal structure and stress distribution.There is thus great potential for the use of 3D printing in the feld of rock mass mechanics.However,3D printing materials also have shortcomings,such as insufcient material strength and accuracy at this stage.Finally,the application prospect of 3D printing technology in rock mass mechanics research is proposed.

关键词： 3D printing Rock mass mechanics Prefabricated cracks Rock-like material Fractured rock mass

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