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矿业科学技术学报(英文版)
矿业科学技术学报(英文版)

骆振福

双月刊

2095-2686

journal@cumt.edu.cn

0516-83885569

221008

江苏省徐州市中国矿业大学内

矿业科学技术学报(英文版)/Journal International Journal of Mining Science and TechnologyCSCDCSTPCD北大核心EISCI
正式出版
收录年代

    Research progress on the adaptability of lunar regolith simulant-based composites and lunar base construction methods

    Bo LiuPeng SunWei YaoTao Li...
    1341-1363页
    查看更多>>摘要:The development and utilization of lunar resources are entering a critical stage.Immediate focus is needed on key technologies for in-situ resource utilization(ISRU)and lunar base construction.This paper comparatively analyzes the basic characteristics of lunar regolith samples returned from Chang'e-5(CE-5),Apollo,and Luna missions,focusing on their physical,mechanical,mineral,chemical,and morpholog-ical parameters.Given the limited availability of lunar regolith,more than 50 lunar regolith simulants are summarized.The differences between lunar regolith and simulants concerning these parameters are dis-cussed.To facilitate the construction of lunar bases,this article summarizes the advancements in research on construction materials derived from lunar regolith simulants.Based on statistical results,lunar regolith simulant-based composites are classified into 5 types by their strengthening and toughen-ing mechanisms,and a comprehensive analysis of molding methods,preparation conditions,and mechanical properties is conducted.Furthermore,the potential lunar base construction forms are reviewed,and the adaptability of lunar regolith simulant-based composites and lunar base construction methods are proposed.The key demands of lunar bases constructed with lunar regolith-based compos-ites are discussed,including energy demand,in-situ buildability,service performance,and structural availability.This progress contributes to providing essential material and methodological support for future lunar construction.

    Experimental investigation of methane explosion fracturing in bedding shales:Load characteristics and three-dimensional fracture propagation

    Yu WangCheng ZhaiTing LiuJizhao Xu...
    1365-1383页
    查看更多>>摘要:Methane in-situ explosion fracturing(MISEF)enhances permeability in shale reservoirs by detonating desorbed methane to generate detonation waves in perforations.Fracture propagation in bedding shale under varying explosion loads remains unclear.In this study,prefabricated perforated shale samples with parallel and vertical bedding are fractured under five distinct explosion loads using a MISEF experimental setup.High-frequency explosion pressure-time curves were monitored within an equivalent perforation,and computed tomography scanning along with three-dimensional reconstruction techniques were used to investigate fracture propagation patterns.Additionally,the formation mechanism and influencing fac-tors of explosion crack-generated fines(CGF)were clarified by analyzing the morphology and statistics of explosion debris particles.The results indicate that methane explosion generated oscillating-pulse loads within perforations.Explosion characteristic parameters increase with increasing initial pressure.Explosion load and bedding orientation significantly influence fracture propagation patterns.As initial pressure increases,the fracture mode transitions from bi-wing to 4-5 radial fractures.In parallel bedding shale,radial fractures noticeably deflect along the bedding surface.Vertical bedding facilitates the devel-opment of transverse fractures oriented parallel to the cross-section.Bifurcation-merging of explosion-induced fractures generated CGF.CGF mass and fractal dimension increase,while average particle size decreases with increasing explosion load.This study provides valuable insights into MISEF technology.

    Shear failure behaviors and degradation mechanical model of rockmass under true triaxial multi-level loading and unloading shear tests

    Zhi ZhengRonghua LiPengzhi PanJinghua Qi...
    1385-1408页
    查看更多>>摘要:The redistribution of three-dimensional(3D)geostress during underground tunnel excavation can easily induce to shear failure along rockmass structural plane,potentially resulting in engineering disasters.However,the current understanding of rockmass shear behavior is mainly based on shear tests under 2D stress without lateral stress,the shear fracture under 3D stress is unclear,and the relevant 3D shear fracture theory research is deficient.Therefore,this study conducted true triaxial cyclic loading and unloading shear tests on intact and bedded limestone under different normal stress σn and lateral stressσp to investigate the shear strength,deformation,and failure characteristics.The results indicate that under different σn and σp,the stress-strain hysteresis loop area gradually increases from nearly zero in the pre-peak stage,becomes most significant in the post-peak stage,and then becomes very small in the residual stage as the number of shear test cycles increases.The shear peak strength and failure sur-face roughness almost linearly increase with the increase in σn,while they first increase and then grad-ually decrease as σp increases,with the maximum increases of 12.9%for strength and 15.1%for roughness.The shear residual strength almost linearly increases with σn,but shows no significant change with σp.Based on the acoustic emission characteristic parameters during the test process,the shear frac-ture process and microscopic failure mechanism were analyzed.As the shear stress τ increases,the acoustic emission activity,main frequency,and amplitude gradually increase,showing a significant rise during the cycle near the peak strength,while remaining almost unchanged in the residual stage.The true triaxial shear fracture process presents tensile-shear mixture failure characteristics dominated by micro-scopic tensile failure.Based on the test results,a 3D shear strength criterion considering the lateral stress effect was proposed,and the determination methods and evolution of the shear modulus G,cohesion cjp,friction angle φjp,and dilation angle φjp during rockmass shear fracture process were studied.Under different σn and σp,G first rapidly decreases and then tends to stabilize;cjp,φjp,and Ψjp first increase rapidly to the maximum value,then decrease slowly,and finally remain basically unchanged.A 3D shear mechanics model considering the effects of lateral stress and shear parameter degradation was further established,and a corresponding numerical calculation program was developed based on 3D discrete element software.The proposed model effectively simulates the shear failure evolution pro-cess of rockmass under true triaxial shear test,and is further applied to successfully reveal the failure characteristics of surrounding rocks with structural planes under different combinations of tunnel axis and geostress direction.

    Spatio-temporal evolution of pore and fracture structures in coal induced by initial damage and creep behavior:A real-time NMR-based approach

    Lei ZhangYimeng WangMingzhong GaoWenhao Jia...
    1409-1425页
    查看更多>>摘要:Understanding the impact of mining disturbances and creep deformation on the macroscopic deforma-tion and the microscopic pore and fracture structures(MPFS)of coal is paramount for ensuring the secure extraction of coal resources.This study conducts cyclic loading-unloading and creep experiments on coal using a low-field nuclear magnetic resonance(NMR)experimental apparatus which is equipped with mechanical loading units,enabling real-time monitoring the T2 spectrum.The experiments indicated that cyclic loading-unloading stress paths initiate internal damage within coal samples.Under identical creep stress conditions,coal samples with more initial damages had more substantial instantaneous deforma-tion and creep deformation during the creep process.After undergoing nearly 35 h of staged creep,the total strains for coal samples CC01,CC02,and CC03 reach 2.160%,2.261%,and 2.282%,respectively.In the creep stage,the peak area ratio of seepage pores and microfractures(SPM)gradually diminishes.A higher degree of initial damage leads to a more pronounced compaction trend in the SPM of coal samples.Considering the porosity evolution of SPM during the creep process,this study proposes a novel fractional derivative model for the porosity evolution of SPM.The efficacy of the proposed model in predicting porosity evolution of SPM is substantiated through experimental validation.Furthermore,an analysis of the impact mechanisms on key parameters in the model was carried out.

    Electromagnetic radiation of granite under dynamic compression

    Juncheng LiQingming ZhangZhixiang LiuRenrong Long...
    1427-1441页
    查看更多>>摘要:To elucidate the characteristics and mechanism of electromagnetic radiation in granite under impact loading,based on the quasi-static compression tests,this paper conducts dynamic compression experi-ments on granite using Hopkinson pressure bar and one-stage light-gas gun as loading methods.Combined with experimental and theoretical analyses,the relationship between mechanical and electro-magnetic responses under impact loads of different intensities,and the time-domain signals of electro-magnetic radiation generated by a single crack under different strain rates are studied.The intensity and frequency of electromagnetic radiation increase with the increasing compressive strain rate.According to the thermal activation theory,it reveals the microscopic mechanism of the transition from intergranular microcracks to transgranular microcracks in terms of strain sensitivity.It also serves as the physical basis for the increase in electromagnetic radiation intensity amplitude and frequency with increasing compressive strain rate.Transgranular microcracks are the primary cause of electromagnetic radiation generated by fractures.

    A universal direct tensile testing method for measuring the tensile strength of rocks

    Yang WuJianfeng LiuZhide WuJunjie Liu...
    1443-1451页
    查看更多>>摘要:There is limited applicability to the current method for testing the direct tensile strength of rocks because it places stringent requirements on the testing equipment.This work suggests a universal method based on the"compression-to-tension"idea in response to these difficulties.By applying pressure,this tech-nique makes it possible to test the tensile strength of rocks directly with any conventional compression test machines.Granite was utilized as the test material in order to validate this suggested testing method,and the results showed what follows.Upon determining the true fracture area through digital reconstruc-tion,an average calculated tensile strength of 5.97 MPa with a Cv of 0.04 was obtained.There is a positive correlation between tensile strength and the joint roughness coefficient(JRC)of the failure surface.The aggregation mode of AE events with the loading process conforms to the damage characteristics of rock tensile failure.The direct tensile testing method proposed in this study not only has high universality but also produces test results with outstanding consistency.Additionally,factors influencing the results of the tensile test are pointed out,and recommendations for optimizing the suggested testing method are offered.

    Study of methane and carbon dioxide adsorption-desorption hysteresis in coals from Sydney Basin:A theoretical and experimental approach

    Zhongbei LiTing RenYuanping ChengXueqiu He...
    1453-1463页
    查看更多>>摘要:Methane(CH4)and carbon dioxide(CO2)are primary components of coal seam gas(CSG).Understanding their adsorption-desorption hysteresis characteristics,along with the fundamental mechanism,is crucial for CSG exploitation and related hazards mitigation.This research focused on the representative Bulli coal seam in the Sydney Basin,Australia.Through the purpose-built indirect gravimetric high-pressure isothermal adsorption-desorption hysteresis experiment,a novel Langmuir-based desorption model,incorporating hysteresis effect and residual gas,was proposed.Quantitative characterization of the adsorption-desorption hysteresis degrees of CO2 and CH4 in coal particles of various sizes and in Φ50 mm × 100 mm intact coal samples were achieved using the improved hysteresis index(IHI).The exper-imental findings validated that the proposed desorption model accurately describes the desorption behavior of CO2 and CH4 in coal(R2>0.99).Based on the adsorption-desorption properties of ink-bottle-shaped micropores and pore deformation caused by gas adsorption-induced coal expansion,the occurrence mechanism of adsorption-desorption hysteresis and the fundamental reasons for the pres-ence of residual gas were elucidated.Furthermore,the study explored the impact of CO2 and CH4 adsorption-desorption hysteresis effects on coal and gas outbursts,suggesting that coal seams rich in CO2 do not have a higher propensity for outbursts than those rich in CH4.

    Crystal structure transformation and lattice impurities migration of quartz during chlorine roasting

    Wenda GuoHaolong LuZhenyue ZhangLing Jiang...
    1465-1474页
    查看更多>>摘要:To investigate the effect of chlorine roasting on the migration and removal of trace elements in quartz lattice,firstly,an efficient pretreatment process,grinding-HCl washing-flotation-HF and HCl leaching,was used to remove the gangue minerals in quartz ore to obtain purified quartz for the preparation of high-purity quartz and the investigation of lattice impurities migration.The results showed that the high-purity quartz with total impurities less than 50 μg/g could be obtained from purified quartz after being treated with chlorine at 1200 ℃.The variation of crystal structure and the lattice impurities migra-tion of quartz during chlorine roasting were studied through in-situ XRD,TGA,SEM-EDS,ICP-MS,FT-IR and XPS analysis.It revealed that the decomposable impurities H2O,-OH,and residual collectors in the crystal of purified quartz could be effectively removed through chlorine roasting above 900 ℃,which also had an obvious effect on the removal of low-valence trace elements Li,Na and K in the crystal of quartz but didn't affect the multivalent trace elements Al and Ti.This study revealed the removal and migration mechanism of the trace elements in quartz crystal during chlorine roasting.

    Exploring the mechanism of a novel cationic surfactant in bastnaesite flotation via the integration of DFT calculations,in-situ AFM and electrochemistry

    Chang LiuLonghua XuJiushuai DengZhiguo Han...
    1475-1484页
    查看更多>>摘要:Effectively separating bastnaesite from calcium-bearing gangue minerals(particularly calcite)presents a formidable challenge,making the development of efficient collectors crucial.To achieve this,we have designed and synthesized a novel,highly efficient,water-soluble cationic collector,N-dodecyl-isopropanolamine(NDIA),for use in the bastnaesite-calcite flotation process.Density functional theory(DFT)calculations identified the amine nitrogen atom in NDIA as the site most susceptible to electrophilic attack and electron loss.By introducing an OH group into the traditional collector dodecylamine(DDA)structure,NDIA provided additional adsorption sites,enabling synergistic adsorption on the surface of bastnaesite,thereby significantly enhancing both the floatability and selectivity of these minerals.The recovery of bastnaesite was 76.02%,while the calcite was 1.26%.The NDIA markedly affected the zeta potential of bastnaesite,while its impact on calcite was relatively minor.Detailed Fourier-transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS)results elucidated that the—NH—and—OH groups in NDIA anchored onto the bastnaesite surface through robust electrostatic and hydrogen bonding interactions,thereby enhancing bastnaesite's affinity for NDIA.Furthermore,in situ atomic force microscopy(AFM)provided conclusive evidence of NDIA aggregation on the bastnae-site surface,improving contact angle and hydrophobicity,and significantly boosting the flotation recov-ery of bastnaesite.