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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
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    Effect of diagenetic variation on the static and dynamic mechanical behavior of coral reef limestone

    Linjian MaJiajun DengMingyang WangJianping Wang...
    893-908页
    查看更多>>摘要:Coral reef limestone at different depositional depths and facies differ remarkably on the textural and mineralogical characteristics,owing to the complex sedimentary diagenesis.To explore the effects of pore structure and mineral composition associated with diagenetic variation on the mechanical behavior of reef limestone,a series of quasi-static and dynamic compression tests along with microscopic exam-inations were performed on the reef limestone at shallow and deep burial depths.It is revealed that the shallow reef limestone(SRL)is classified as a porous aragonite-type carbonate rock with high porosity(55.3±3.2)% and pore connectivity.In comparison,the deep reef limestone(DRL)is mainly composed of dense calcite-type calcium carbonate with low porosity(4.9±1.6)% and pore connectivity.The DRL strengthened and stiffened by the tight grain framework consistently displays much higher values of the dynamic compressive strength,elastic modulus,brittleness index,and specific energy absorption than those of the SRL.The gap between two types of limestone further increases with an increase in strain rate.It appears that the failure pattern of SRL is dominated by the inherent defects like weak bonding interfaces and growth lines,revealed by the intricate fracturing network and mixed failure.Likewise,although the preexisting megapores in DRL may affect the crack propagation on pore tips to a certain dis-tance,it hardly alters the axial splitting failure of DRL under impacts.The stress wave propagation and attenuation in SRL is primarily controlled by the reflection and diffusion caused by plenty mesopores,as well as an energy dissipation in layer-wise pore collapse and adjacent grain crushing,while the stress wave in DRL is highly hinged on the insulation and diffraction induced by the isolated megapores.This process is accompanied by the energy dissipation behavior of inelastic deformation resulted from the pore-emanated microcracking.

    Mechanical properties and damage evolution characteristics of waste tire steel fiber-modified cemented paste backfill

    Shenggen CaoChiyuan CheYun ZhangChanghao Shan...
    909-924页
    查看更多>>摘要:During the process of constructional backfill mining,the cemented paste backfill(CPB)typically exhibits a high degree of brittleness and limited resistance to failure.In this study,the mechanical and damage evolution characteristics of waste tire steel fiber(WTSF)-modified CPB were studied through uniaxial compression tests,acoustic emission(AE)tests,and scanning electron microscopy(SEM).The results showed that the uniaxial compressive strength(UCS)decreased when the WTSF content was 0.5%,1%,and 1.5%.When the WTSF content reached 1%,the UCS of the modified CPB exhibited a minimal decrease(0.37 MPa)compared to that without WTSF.When the WTSF content was 0.5%,1%,and 1.5%,peak strain of the WTSF-modified CPB increased by 18%,31.33%,and 81.33%,while the elastic modulus decreased by 21.31%,26.21%,and 45.42%,respectively.The addition of WTSF enhances the activity of AE events in the modified CPB,resulting in a slower progression of the entire failure process.After the failure,the modified CPB retained a certain level of load-bearing capacity.Generally,the failure of the CPB was dominated by tensile cracks.After the addition of WTSF,a gradual increase in the proportion of tensile cracks was observed upon loading the modified CPB sample to the pore compaction stage.The three-dimensional localization of AE events showed that the WTSF-modified CPB underwent progressive damage during the loading,and the samples still showed good integrity after failure.Additionally,the response relation-ship between energy evolution and damage development of WTSF-modified CPB during uniaxial com-pression was analyzed,and the damage constitutive model of CPB samples with different WTSF contents was constructed.This study provides a theoretical basis for the enhancement of CPB modified by adding WTSF,serving as a valuable reference for the design of CPB constructional backfill.

    Assessment and control of the mine tremor disaster induced by the energy accumulation and dispersion of thick-hard roofs

    Bin YuMingxian PengYang TaiShuai Guo...
    925-941页
    查看更多>>摘要:In order to solve the problem that current theory models cannot accurately describe thick-hard roof(THR)elastic energy and assess the mine tremor disasters,a theoretical method,a Timoshenko beam the-ory on Winkler foundation was adopted to establish the THR's periodic breaking model.The superposi-tion principle was used for this complex model to derive the calculation formulas of the elastic energy and impact load on hydraulic supports.Then,the influence of roof thickness h,cantilever length L1,and load q on THR's elastic energy and impact load was analyzed.And,the effect of mine tremor disasters was assessed.Finally,it is revealed that:(1)The THR's elastic energy U exhibits power-law variations,with the fitted relationships U=0.0096L13.5866,U=5943.9h-1.935,and U=21.049q2.(2)The impact load on hydraulic supports FZJ increases linearly with an increase in the cantilever length,thickness,and applied load.The fitted relationships are FZJ=1067.3L1+6361.1,FZJ=125.89h+15100,and FZJ=10420q+3912.6.(3)Ground hydraulic fracturing and liquid explosive deep-hole blasting techniques effectively reduce the THR's cantilever length at periodic breakages,thus eliminating mine tremor disasters.

    Enhancing microseismic/acoustic emission source localization accuracy with an outlier-robust kernel density estimation approach

    Jie ChenHuiqiong HuangYichao RuiYuanyuan Pu...
    943-956页
    查看更多>>摘要:Monitoring sensors in complex engineering environments often record abnormal data,leading to signif-icant positioning errors.To reduce the influence of abnormal arrival times,we introduce an innovative,outlier-robust localization method that integrates kernel density estimation(KDE)with damping linear correction to enhance the precision of microseismic/acoustic emission(MS/AE)source positioning.Our approach systematically addresses abnormal arrival times through a three-step process:initial location by 4-arrival combinations,elimination of outliers based on three-dimensional KDE,and refinement using a linear correction with an adaptive damping factor.We validate our method through lead-breaking experiments,demonstrating over a 23% improvement in positioning accuracy with a maximum error of 9.12 mm(relative error of 15.80%)-outperforming 4 existing methods.Simulations under various sys-tem errors,outlier scales,and ratios substantiate our method's superior performance.Field blasting experiments also confirm the practical applicability,with an average positioning error of 11.71 m(rela-tive error of 7.59%),compared to 23.56,66.09,16.95,and 28.52 m for other methods.This research is sig-nificant as it enhances the robustness of MS/AE source localization when confronted with data anomalies.It also provides a practical solution for real-world engineering and safety monitoring applications.

    Stability mechanism and control of the pumpable supports in longwall recovery room

    Dong ZhangJianbiao BaiZhijun TianZizheng Zhang...
    957-974页
    查看更多>>摘要:The load-bearing performance(LBP)of pumpable supports(PPS)is crucial for the stability of longwall pre-driven recovery room(PRR)surrounding rock.However,the unbalanced bearing coefficient(UBC)of the PPS(undertaking unequal load along the mining direction)has not been investigated.A mechanical model of the PRR was established,considering the main roof cantilever beam structure,to derive an assessment formula for the load,the failure criteria,and the UBC of the PPS.Subsequently,the generation mechanisms,and influencing factors of the UBC were revealed.Global sensitivity analysis shows that the main roof hanging length(l2)and the spacing between the PPS(r)significantly impact the UBC.A novel design of the PPS and the coupling control technology were proposed and applied to reduce the UBC of the PPS in the adjacent longwall PRR.Monitor results showed no failure of the PPS at the test site,with the UBC(ζ)reduced to 1.1 consistent with the design value(1.15)basically,fully utilizing the collabora-tive LBP of the PPS.Finally,the maximum roof-to-floor convergence of the PRR was 234 mm,effectively controlling the stability of the surrounding rock of the PRR and ensuring the mining equipment recovery.

    Failure evolution and disaster prediction of rock under uniaxial compression based on non-extensive statistical analysis of electric potential

    Tiancheng ShanZhonghui LiHaishan JiaEnyuan Wang...
    975-993页
    查看更多>>摘要:Rock failure can cause serious geological disasters,and the non-extensive statistical features of electric potential(EP)are expected to provide valuable information for disaster prediction.In this paper,the uni-axial compression experiments with EP monitoring were carried out on fine sandstone,marble and gran-ite samples under four displacement rates.The Tsallis entropy q value of EPs is used to analyze the self-organization evolution of rock failure.Then the influence of displacement rate and rock type on q value are explored by mineral structure and fracture modes.A self-organized critical prediction method with q value is proposed.The results show that the probability density function(PDF)of EPs follows the q-Gaussian distribution.The displacement rate is positively correlated with q value.With the displacement rate increasing,the fracture mode changes,the damage degree intensifies,and the microcrack network becomes denser.The influence of rock type on q value is related to the burst intensity of energy release and the crack fracture mode.The q value of EPs can be used as an effective prediction index for rock fail-ure like b value of acoustic emission(AE).The results provide useful reference and method for the mon-itoring and early warning of geological disasters.

    A new elastoplastic model for bolt-grouted fractured rock

    Haoyi LiShuangying ZuoPeiyuan Lin
    995-1016页
    查看更多>>摘要:Complexities in mechanical behaviours of rock masses mainly stem from inherent discontinuities,which calls for advanced bolt-grouting techniques for stability enhancement.Understanding the mechanical properties of bolt-grouted fractured rock mass(BGFR)and developing accurate prediction methods are crucial to optimize the BGFR support strategies.This paper establishes a new elastoplastic(E-P)model based on the orthotropic and the Mohr-Coulomb(M-C)plastic-yielding criteria.The elastic parameters of the model were derived through a meso-mechanical analysis of composite materials mechanics(CMM).Laboratory BGFR specimens were prepared and uniaxial compression test and variable-angle shear test considering different bolt arrangements were carried out to obtain the mechanical parameters of the specimens.Results showed that the anisotropy of BGFR mainly depends on the relative volume content of each component material in a certain direction.Moreover,the mechanical parameters deduced from the theory of composite materials which consider the short fibre effect are shown to be in good agreement with those determined by laboratory experiments,and the variation rules maintained good consistency.Last,a case study of a real tunnel project is provided to highlight the effectiveness,validity and robustness of the developed E-P model in prediction of stresses and deformations.

    Impact and mechanism of bisphosphonate depressant 1-hydroxypropane-1,1-diphosphonic acid on flotation decalcification of dolomite-rich magnesite ore

    Wengang LiuXudong ChenWenbao LiuNaixu Zhang...
    1017-1032页
    查看更多>>摘要:Given the depletion of high-quality magnesite deposits and the rising demand for high-end magnesium materials,the separation and utilization of high-calcium magnesite ores have become essential.However,the similar surface properties and solubility of semi-soluble salt-type minerals,pose significant chal-lenges for the utilization of dolomite-rich magnesite resources.In this study,1-hydroxypropane-1,1-di phosphonic acid(HPDP)was identified for the first time as a high-performance depressant for dolomite.Various tests,including contact angle measurements,ζ potential analysis,X-ray photoelectron spec-troscopy,and atomic force microscopy,were conducted to elucidate the interfacial interaction mecha-nisms of HPDP on the surfaces of the two minerals at different scales.Additionally,molecular modeling calculations were used to detail the spatial matching relationship between HPDP and the crys-tal faces of the two minerals.It was emphasized that HPDP specifically adsorbed onto the dolomite sur-face by forming calcium phosphonate,ensuring that the dolomite surface remained hydrophilic and sank.Moreover,it was found that the adsorption strength of HPDP on the mineral surfaces depended on the activity of the metal sites and their spatial distribution.These findings provide a theoretical foundation for the molecular design of flotation reagents for high-calcium magnesite ores.

    Influence mechanism of government subsidy on the green transformation of coal company in China

    Xiaolei LiChangsong Wu
    1033-1040页
    查看更多>>摘要:The optimization of government subsidies to enhance the efficiency of coal companies'green transforma-tion constitutes a critical component in the pursuit of global sustainability.We investigate the influence mechanism of government subsidies on the green transformation using data from the listed coal compa-nies in China from 2007 to 2022.According to our findings and hypothesis testing,previous government subsidies did not have a significant direct impact on coal companies'green transformation.Nevertheless,government subsidies can help coal companies transition to greener practices by promoting innovative green initiatives.Furthermore,we confirmed an indirect route:that government subsidies enable the adoption of low-carbon initiatives,which in turn could facilitate the transition of coal companies towards green practices.In addition,we discovered that the coal company's digitization will improve this indirect route.Thus,we propose increasing the effectiveness of government subsidies in facilitating coal compa-nies'transition to green practices by focusing on technological advancements and enhancing company digitalization.