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Height of fractured zone inside overlying strata under high-intensity mining in China

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international Journal of Mining Science and Technology 2019年第1期29卷 45-49页

作者： Wenbing Guo Gaobo Zhao Gaozhong Lou Shuren Wang School of Energy Science and Engineering Henan Polytechnic University Coal Production Safety Collaborative Innovation Center in henan province Henan Polytechnic University international joint research laboratory for underground space development and disaster prevention of henan province Henan Polytechnic University

The height of fractured zone(HFZ) at the high-intensity longwall mining panel plays a vital role in the safety analysis of coal mining under bodies of water. This paper described definitions of the highintensity mining. The processes of overburden failure transfer(OFT) were analyzed, which were divided into the development stage and the termination stage. Through theoretical analysis, the limited suspension-distance and the limited overhanging distance were proposed to judge the damage of each stratum. Mechanical models of strata suspended integrity and overhanging stability were established.A theoretical method to predict the HFZ at the high-intensity longwall mining panel was put forward based on the processes of OFT. Taking a high-intensity longwall mining panel(No. 11915 panel) as an example, the theoretical method proposed, the engineering analogy and the empirical formulas in the Regulation were used to predict the HFZ. The results show that the theoretical result is consistent with the engineering analogies' result and empirical formulas' result. The rationality and reliability of the theoretical method proposed is verified.

关键词： High-intensity mining Overburden failure Height of fractured zone Overlying strata movement

Cementitious property of NaAlO2-activated Ge slag as cement supplement

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international Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1594-1603页

作者： Hua-zhe Jiao Shu-fei Wang Ai-xiang Wu Hui-ming Shen Jian-dong Wang international joint research laboratory of henan province for underground space development and disaster prevention Henan Polytechnic UniversityJiaozuo 454000China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China

Germanium(Ge),a waste residue leaching from zinc(Zn)smelting process,has potential cementitious properties and could be recycled as a cement supplement activated by chemical *** this work,a test was conducted to determine the hydration properties of Ge slag-cement-based composites with Ge slag(GS)/ordinary Portland cement(PC)contents of 0wt%,5wt%,10wt%,15wt%,20wt%,and 25wt% and water-to-binder ratio(w/b)of *** activators Ca(OH)2,AlCl3,NaAlO2,and Na2CO3 were mixed under 1wt%,2wt%,3wt%,and 4wt% dosages of GS *** composition and microstructure of the hydration products were investigated by the combined approaches of X-ray diffraction(XRD),thermogravimetry-differential scanning calorimetry(TG-DSC),scanning electron microscopy(SEM),and energy-dispersive X-ray spectroscopy(EDS).First,the GS cementitious property is attributed to the high content of CaSO4·***,the activators affected the acceleration performance in the following order:NaAlO2,Na2CO3,AlCl3,and Ca(OH)*** importantly,the 28-day unconfined compressive strength(UCS)is 45.34 MPa at the optimum formula of 0.6wt% NaAlO2,15wt% GS,and 85wt% PC,which is 9.16% higher than the ***,NaAlO2 is beneficial for the ettringite(AFt)generation,resulting in the C-S-H structure ***,the Zn^2+ residue inhibited the AFt formation,representing an important challenge to the strength growth with curing ***,the GS could be recycled as a supplement to the cement under the activator NaAlO2.

关键词： Ge slag from zinc process recycling activator cement supplements strength

Preliminary research and scheme design of deep underground in situ geo-information detection experiment for Geology in Time

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international Journal of Mining Science and Technology 2024年第1期34卷 1-13页

作者： Heping Xie Ru Zhang Zetian Zhang Yinshuang Ai Jianhui Deng Yun Chen Yong Zhou Mingchuan Li Liqiang Liu Mingzhong Gao Zeqian Yang Weiqiang Ling Heng Gao Qijun Hao Kun Xiao Chendi Lou State Key laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep underground Engineering Sichuan UniversityChengdu 610065China College of Water Resource&Hydropower Sichuan UniversityChengdu 610065China Guangdong Provincial Key laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen 518060China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China Yalong River Hydropower development Company Limited Chengdu 610051China

The deep earth,deep sea,and deep space are the main parts of the national“three deep”strategy,which is in the forefront of the strategic deployment clearly defined in China’s 14th Five-Year Plan(2021-2025)and the Long-Range Objectives Through the Year *** is important to reveal the evolutionary process and mechanism of deep tectonics to understand the earth’s past,present and *** academic con-notation of Geology in Time has been given for the first time,which refers to the multi-field evolution response process of geological bodies at different time and spatial scales caused by geological processes inside and outside the *** on the deep in situ detection space and the unique geological envi-ronment of China Jinping underground laboratory,the scientific issue of the correlation mechanism and law between deep internal time-varying and shallow geological response is given *** research and frontier exploration on deep underground in situ geo-information detection experiments for Geology in Time are designed to be carried out,which will have the potential to explore the driving force of Geology in Time,reveal essential laws of deep earth science,and explore innovative technologies in deep underground engineering.

关键词： Deep underground Geology in Time China Jinping underground laboratory In situ detection

The Micro-Scale Mechanism of Metal Mine Tailings Thickening Concentration Improved by Shearing in Gravity Thickener

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Journal of Renewable Materials 2021年第4期9卷 637-650页

作者： Huazhe Jiao Yachuang Wu Wei Wang Xinming Chen Yunfei Wang Juanhong Liu Wentao Feng international joint research laboratory of henan province for underground space development and disaster prevention Henan Polytechnic UniversityJiaozuo454000China College of Safety Science and Engineering Henan Polytechnic UniversityJiaozuo454000China Civil and Resource Engineering School University of Science and Technology BeijingBeijing100000China No.11 Coal Mine of Pingdingshan Tianan Coal Mining Co. Ltd.Pingdingshan467000China

Higher concentration is beneficial for the Paste and Thickened Tailings(PTT)operation in metal *** paste thickeners are produced lower density *** tailings are intended to form a water entrapped network structure in thickener,which is detrimental to underflow *** this study,the continuous thickening experiment was carried out for ultra-fine tungsten tailings to study the influence of rake shearing on *** micro pores structure and seepage flow in tailings bed before and after shearing are studied by CT and simulation approach to reveal the shearing enhancement mechanism of thickening *** results shown that,the underflow concentration is increased from 61.4 wt%to 69.6 wt%by rake shearing in a pilot scale thickener,the porosity decreased from 46.48%to 37.46%.The entrapped water discharged from sticks structure more than sphere *** items of seepage,after shearing,the seepage flow channel of tailings underflow is becoming longer,which caused the decreasing average flow rate decreases and absolute *** absolute permeability is negatively correlated with *** rake shearing can destroy the flocs structure;change the effective stress to increase the *** underflow concentration improves the waste recycling and water recovery rate,especially for arid areas.

关键词： Metal mine tailings gravity thickening shearing effect pore microstructure reverse direction seepage flow channel

Safety analysis of building foundations over old goaf under additional stress from building load and seismic actions

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international Journal of Mining Science and Technology 2014年第5期24卷 713-718页

作者： Xu Ping Mao Xianbiao Zhang Minxia Zhou Yuejin Yu Bangyong State Key laboratory for Geomechanics & Deep underground Engineering China University of Mining & Technology School of Civil Engineering Henan Polytechnic University

Additional displacement of the building foundations over old goaf are prone to happen under the addi- tional loads induced by new buildings, weakening-rock mass by mining and seismic actions, which will cause serious damage to the buildings. In order to analyze the safety of the building foundations safety over the old goaf. the structure characteristics of the strata over the old goaf was investigated and the instability conditions of overhanging rocks upon old goaf were also analyzed in this paper. The results indicate that the stability of overhanging rocks is remarkably decreased by the interactions of mining fractures, earthquake force and building load, in addition, the settlement of the foundations over old goal is increased by the instability of overhanging rocks. According to the location of a new power plant in Yima Mine and its ambient conditions, we defined the influence scope of old goal via resistivity tomography. Based on the seismic parameters of the construction site, a numerical FLAC3d model of the building foundation under the seismic actions and building load was developed. The numerical results are obtained as follows： the foundation of the main power house meets the requirement of 6° seismic fortification intensity： however, under 7° seismic fortification intensity, the maximum differential settlement of foundation between the neighboring pillars is close to the maximum allowable value, while the seismic fortification intensity reaches 8°, but the safety requirements will not be satisfied.

关键词： Seismic actions Additional stress Old goaf Foundation Settlement

Rational architecture design of yolk/double-shells Si-based anode material with double buffering carbon layers for high performance lithium-ion battery

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Green Energy & Environment 2021年第4期6卷 517-527页

作者： Zhenyu Wu Jing Luo Jiao Peng Hong Liu Baobao Chang Xianyou Wang National Base for international Science&Technology Cooperation Hunan Province Key Laboratory of Electrochemical Energy Storage and ConversionSchool of ChemistryXiangtan UniversityXiangtan411105China Key laboratory of Materials Processing and Mold of Ministry of Education Zhengzhou UniversityHenan450001China

Among the many strategies to fabricate the silicon/carbon composite,yolk/double-shells structure can be regarded as an effective strategy to overcome the intrinsic defects of Si-based anode materials for Li-ion batteries(LIBs).Hereon,a facile and inexpensive technology to prepare silicon/carbon composite with yolk/double-shells structure is proposed,in which the double buffering carbon shells are *** silicon/carbon nanoparticles with core-shell structure are encapsulated by SiO_(2)and external carbon layer,and it shows the yolk/double-shells structure via etching the SiO_(2)sacrificial *** multiply shells structure not only significantly improves the electrical conductivity of composite,but also effectively prevents the exposure of Si particles from the electrolyte ***,the yolk/double-shells structure can provide enough space to accommodate the volume change of the electrode during charge/discharge process and avoid the pulverization of Si ***,the as-prepared YDS-Si/C shows excellent performance as anode of LIBs,the reversible capacity is as high as 1066 mA h g^(-1) at the current density of 0.5 A g^(-1) after 200 *** the same time,the YDS-Si/C has high capacity retention and good cyclic ***,the unique architecture design of yolk/double-shells for Si/C composite provides an instructive exploration for the development of next generation anode materials of LIBs with high electrochemical performances and structural stability.

关键词： Silicon/carbon composite Structure design Yolk/double-shells Double buffering carbon layers Li-ion batteries

Cable-truss supporting system for gob-side entry driving in deep mine and its application

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international Journal of Mining Science and Technology 2016年第5期26卷 885-893页

作者： Yin Qian Jing Hongwen Dai Dapeng Zhu Tantan Zhao Honghui Meng Bo State Key laboratory for Geomechanics ＆ Deep underground Engineering China University of Mining ＆ Technology Xuzhou 221116 China Shanghai underground space Architectural Design ＆ research Institute Shanghai 200020 China East China Environmental ＆ Geotechnical Engineering Branch China Petroleum Qingdao 266000 China

In order to solve the large deformation controlling problem for surrounding rock of gob-side entry driving under common cable anchor support in deep mine, site survey, physical modeling experiment, numerical simulation and field measurement were synthetically used to analyze the deformation and failure characteristics of surrounding rock. Besides, applicability analysis, prestress field distribution characteristics of surrounding rock and the control effect on large deformation of surrounding rock were also further studied for the gob-side entry driving in deep mine using the cable-truss supporting system. The results show that, first, compared with no support and traditional bolt anchor support, roof cable-truss system can effectively restrain the initiation and propagation of tensile cracks in the roof surrounding rock and arc shear cracks in the two sides, moreover, the broken development of surrounding rock, roof separation and extrusion deformation between the two sides of the roadway are all controlled; second, a prestressed belt of trapezoidal shape is generated in the surrounding rock by the cable-truss supporting system, and the prestress field range is wide. Especially, the prestress concentration belt in the shallow surrounding rock can greatly improve the anchoring strength and deformation resisting capability of the rock stratum;third, an optimized support system of ‘‘roof and side anchor net beam, roof cable-truss supporting system and anchor cable of the narrow coal pillar" was put forward, and the support optimization design and field industrial test were conducted for the gob-side entry driving of the working face 5302 in Tangkou Mine, from which a good supporting effect was obtained.

关键词： Deep mine Gob-side entry driving Cable-truss supporting system Deformation and failure Stability

Experimental study on methane dissolved in surfactant-alkane system

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international Journal of Mining Science and Technology 2020年第6期30卷 865-873页

作者： Zhian Huang Mingli Chen Jingjing Wang Yinghua Zhang Linghua Zhang Hui Wang Yukun Gao Yupeng Zhou State Key laboratory of High-Efficient Mining and Safety of Metal Mines University of Science and Technology-BeijingMinistry of EducationBeijing 100083China Work Safety Key Lab on prevention and Control of Gas and Roof disasters for Southern Coal Mines Hunan University of Science and TechnologyXiangtan 411201China State Key laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic UniversityJiaozuo 454000China Beijing Key laboratory of Operation Safety of Gas Heating and Underground PipelinesBeijing Research Center of Urban System EngineeringBeijing 100035China

A surfactant-polyalkane system is investigated using chemical reagents to dissolve methane and control coal seam gas from low-energy,high-efficiency,safety,and environmental protection *** different temperatures and pressures,a high-temperature and high-pressure reactor,gas chromatograph,and other related experimental equipment were used to perform methane dissolution experiments,and a single surfactant sodium oleate(NaOA)and n-hexane demonstrated superior *** single-factor experiments of temperature,pressure,and NaOA addition were performed and fitted via a response surface *** optimal conditions for methane solubility were as follows:temperature of 34C,pressure of 4.5 MPa,NaOA addition of 85 g/L,and time of 1 *** optimal effect of the surfactant-polyalkane system in dissolving methane was achieved with 32.31 mL/100 ***,the change in the surface structure of coal before and after washing with the system was compared using scanning electron *** results indicated that the gas after washing with the surfactant-polyalkane system dissolved,and the surface pore structure of the coal ***,the specific surface area and pore size of the coal surface increased after ***,the desorption of gas from the coal surface into the system becomes easy,thereby reducing the gas content in the coal sample.

关键词： Surfactant Polyalkane solution Methane

international experience of carbon neutrality and prospects of key technologies:Lessons for China

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Petroleum Science 2023年第2期20卷 893-909页

作者： Zheng-Meng Hou Ying Xiong Jia-Shun Luo Yan-Li Fang Muhammad Haris Qian-Jun Chen Ye Yue Lin Wu Qi-Chen Wang Liang-Chao Huang Yi-Lin Guo Ya-Chen Xie Institute of Subsurface Energy Systems Clausthal University of TechnologyClausthal-Zellerfeld38678Germany School of Earth and space Sciences Peking UniversityBeijing100871China State Key laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina Sino-German Energy research Center Sichuan UniversityChengdu610065SichuanChina Department of Petroleum&Gas Engineering University of Engineering&Technology54890LahorePakistan Yunnan Key Lab.of Sino-German Blue Mining and Utilization of Special underground space Kunming650093YunnanChina Sino-German research Institute of Carbon Neutralization and Green development Zhengzhou UniversityZhengzhou450000HenanChina State Key laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071HubeiChina

Carbon neutrality(or climate neutrality)has been a global consensus,and international experience exchange is *** the differences in the degree of social development,resource endowment and technological level,each country should build a carbon-neutral plan based on its national *** with other major developed countries(e.g.,Germany,the United States and Japan),China's carbon neutrality has much bigger challenges,including a heavy and time-pressured carbon reduction task and the current energy structure that is over-dependent on fossil *** we provide a comprehensive review of the status and prospects of the key technologies for low-carbon,near-zero carbon,and negative carbon *** innovations associated with coal,oil-gas and hydrogen industries and their future potential in reducing carbon emissions are particularly explained and *** on integrated analysis of international experience from the world's major developed countries,in-depth knowledge of the current and future technologies,and China's energy and ecological resources potential,five lessons for the implementation of China's carbon neutrality are proposed:(1)transformation of energy production pattern from a coal-dominated pattern to a diversified renewable energy pattern;(2)renewable power-to-X and large-scale underground energy storage;(3)integration of green hydrogen production,storage,transport and utilization;(4)construction of clean energy systems based on smart sector coupling(ENSYSCO);(5)improvement of ecosystem carbon sinks both in nationwide forest land and potential desert in Northwest *** paper provides an international perspective for a better understanding of the challenges and opportunities of carbon neutrality in China,and can serve as a theoretical foundation for medium-long term carbon neutral policy formulation.

关键词： international experience Carbon reduction technologies Carbon neutrality Energy transition underground energy storage Carbon capture,utilization and storage(CCUS)