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

    Heping XieRu ZhangZetian ZhangYinshuang Ai...
    1-13页
    查看更多>>摘要：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 2035.It is important to reveal the evolutionary process and mechanism of deep tectonics to understand the earth's past,present and future.The 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 Earth.Based 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 attention.Innovative 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.
      原文链接:
    • 万方数据
    • 维普

    Numerical and experimental investigation on hydraulic-electric rock fragmentation of heterogeneous granite

    Xiaohua ZhuLing HeWeiji LiuYunxu Luo...
    15-29页
    查看更多>>摘要：Hydraulic-electric rock fragmentation(HERF)plays a significant role in improving the efficiency of high voltage pulse rock breaking.However,the underlying mechanism of HERF remains unclear.In this study,considering the heterogeneity of the rock,microscopic thermodynamic properties,and shockwave time domain waveforms,based on the shockwave model,digital imaging technology and the discrete element method,the cyclic loading numerical simulations of HERF is achieved by coupling electrical,thermal,and solid mechanics under different formation temperatures,confining pressure,initial peak voltage,elec-trode bit diameter,and loading times.Meanwhile,the HERF discharge system is conducive to the labo-ratory experiments with various electrical parameters and the resulting broken pits are numerically reconstructed to obtain the geometric parameters.The results show that,the completely broken area consists of powdery rock debris.In the pre-broken zone,the mineral cementation of the rock determines the transition of type CⅠ cracks to type CⅡ and type Cm cracks.Furthermore,the peak pressure of the shockwave increased with initial peak voltage but decreased with electrode bit diameter,while the wave front time reduced.Moreover,increasing well depth,formation temperature and confining pressure aug-ment and inhibit HERF,but once confining pressure surpassed the threshold of 60 MPa for 152.40,215.90,and 228.60 mm electrode bits,and 40 MPa for 309.88 mm electrode bits,HERF is promoted.Additionally,for the same kind of rock,the volume and width of the broken pit increase with higher initial peak voltage and rock fissures will promote HERF.Eventually,the electrode drill bit with a 215.90 mm diameter is more suitable for drilling pink granite.This research contributes to a better microscopic understanding of HERF and provides valuable insights for electrode bit selection,as well as the optimization of circuit parameters for HERF technology.
      原文链接:
    • 万方数据
    • 维普

    Heat transfer and temperature evolution in underground mining-induced overburden fracture and ground fissures:Optimal time window of UAV infrared monitoring

    Yixin ZhaoKangning ZhangBo SunChunwei Ling...
    31-50页
    查看更多>>摘要：Heat transfer and temperature evolution in overburden fracture and ground fissures are one of the essen-tial topics for the identification of ground fissures via unmanned aerial vehicle(UAV)infrared imager.In this study,discrete element software UDEC was employed to investigate the overburden fracture field under different mining conditions.Multiphysics software COMSOL were employed to investigate heat transfer and temperature evolution of overburden fracture and ground fissures under the influence of mining condition,fissure depth,fissure width,and month alternation.The UAV infrared field measure-ments also provided a calibration for numerical simulation.The results showed that for ground fissures connected to underground goaf(Fissure Ⅰ),the temperature difference increased with larger mining height and shallow buried depth.In addition,Fissure Ⅰ located in the boundary of the goaf have a greater temperature difference and is easier to be identified than fissures located above the mining goaf.For ground fissures having no connection to underground goaf(Fissure Ⅱ),the heat transfer is affected by the internal resistance of the overlying strata fracture when the depth of Fissure Ⅱ is greater than 10 m,the temperature of Fissure Ⅱ gradually equals to the ground temperature as the fissures'depth increases,and the fissures are difficult to be identified.The identification effect is most obvious for fis-sures larger than 16 cm under the same depth.In spring and summer,UAV infrared identification of min-ing fissures should be carried out during nighttime.This study provides the basis for the optimal time and season for the UAV infrared identification of different types of mining ground fissures.
      原文链接:
    • 万方数据

    Classifying rockburst with confidence:A novel conformal prediction approach

    Bemah IbrahimIsaac Ahenkorah
    51-64页
    查看更多>>摘要：The scientific community recognizes the seriousness of rockbursts and the need for effective mitigation measures.The literature reports various successful applications of machine learning(ML)models for rockburst assessment;however,a significant question remains unanswered:How reliable are these mod-els,and at what confidence level are classifications made?Typically,ML models output single rockburst grade even in the face of intricate and out-of-distribution samples,without any associated confidence value.Given the susceptibility of ML models to errors,it becomes imperative to quantify their uncertainty to prevent consequential failures.To address this issue,we propose a conformal prediction(CP)frame-work built on traditional ML models(extreme gradient boosting and random forest)to generate valid classifications of rockburst while producing a measure of confidence for its output.The proposed frame-work guarantees marginal coverage and,in most cases,conditional coverage on the test dataset.The CP was evaluated on a rockburst case in the Sanshandao Gold Mine in China,where it achieved high cover-age and efficiency at applicable confidence levels.Significantly,the CP identified several"confident"clas-sifications from the traditional ML model as unreliable,necessitating expert verification for informed decision-making.The proposed framework improves the reliability and accuracy of rockburst assess-ments,with the potential to bolster user confidence.
      原文链接:
    • 万方数据
    • 维普

    Drilling-based measuring method for the c-ψ parameter of rock and its field application

    Bei JiangFenglin MaQi WangHongke Gao...
    65-76页
    查看更多>>摘要：The technology of drilling tests makes it possible to obtain the strength parameter of rock accurately in situ.In this paper,a new rock cutting analysis model that considers the influence of the rock crushing zone(RCZ)is built.The formula for an ultimate cutting force is established based on the limit equilibrium principle.The relationship between digital drilling parameters(DDP)and the c-ψ parameter(DDP-cψ for-mula,where c refers to the cohesion and ψ refers to the internal friction angle)is derived,and the response of drilling parameters and cutting ratio to the strength parameters is analyzed.The drilling-based measuring method for the c-ψ parameter of rock is constructed.The laboratory verification test is then completed,and the difference in results between the drilling test and the compression test is less than 6％.On this basis,in-situ rock drilling tests in a traffic tunnel and a coal mine roadway are carried out,and the strength parameters of the surrounding rock are effectively tested.The average difference ratio of the results is less than 11％,which verifies the effectiveness of the proposed method for obtaining the strength parameters based on digital drilling.This study provides methodological support for field testing of rock strength parameters.
      原文链接:
    • 万方数据

    Pore-pressure and stress-coupled creep behavior in deep coal:Insights from real-time NMR analysis

    Wenhao JiaHongwei ZhouSenlin XieYimeng Wang...
    77-90页
    查看更多>>摘要：Understanding the variations in microscopic pore-fracture structures(MPFS)during coal creep under pore pressure and stress coupling is crucial for coal mining and effective gas treatment.In this manu-script,a triaxial creep test on deep coal at various pore pressures using a test system that combines in-situ mechanical loading with real-time nuclear magnetic resonance(NMR)detection was conducted.Full-scale quantitative characterization,online real-time detection,and visualization of MPFS during coal creep influenced by pore pressure and stress coupling were performed using NMR and NMR imaging(NMRI)techniques.The results revealed that seepage pores and microfractures(SPM)undergo the most significant changes during coal creep,with creep failure gradually expanding from dense primary pore fractures.Pore pressure presence promotes MPFS development primarily by inhibiting SPM compression and encouraging adsorption pores(AP)to evolve into SPM.Coal enters the accelerated creep stage earlier at lower stress levels,resulting in more pronounced creep deformation.The connection between the micro and macro values was established,demonstrating that increased porosity at different pore pres-sures leads to a negative exponential decay of the viscosity coefficient.The Newton dashpot in the ideal viscoplastic body and the Burgers model was improved using NMR experimental results,and a creep model that considers pore pressure and stress coupling using variable-order fractional operators was developed.The model's reasonableness was confirmed using creep experimental data.The damage-state adjustment factors ω and β were identified through a parameter sensitivity analysis to characterize the effect of pore pressure and stress coupling on the creep damage characteristics(size and degree of difficulty)of coal.
      原文链接:
    • 万方数据
    • 维普

    Experimental investigation of the inhibition of deep-sea mining sediment plumes by polyaluminum chloride

    Fengpeng ZhangXuguang ChenJiakang WeiYangyang Zhang...
    91-104页
    查看更多>>摘要：Deep-sea sediment disturbance may occur when collecting polymetallic nodules,resulting in the creation of plumes that could have a negative impact on the ecological environment.This study aims to investi-gate the potential solution of using polyaluminum chloride(PAC)in the waterjet.The effects of PAC are examined through a self-designed simulation system for deep-sea polymetallic nodule collection and sediment samples from a potential deep-sea mining area.The experimental results showed that the opti-mal PAC dose was found to be 0.75 g/L.Compared with the test conditions without the addition of PAC,the presence of PAC leads to a reduction in volume,lower characteristic turbidity,smaller diffusion veloc-ity,and shorter settling time of the plume.This indicates that PAC inhibits the entire development pro-cess of the plume.The addition of PAC leads to the flocculation of mm-sized particles,resulting in the formation of cm-sized flocs.The flocculation of particles decreases the rate of erosion on the seabed by around 30％.This reduction in erosion helps to decrease the formation of plumes.Additionally,when the size of suspended particles increases,it reduces the scale at which they diffuse.Furthermore,the set-tling velocity of flocs(around 10 2 m/s)is much higher that of compared to sediment particles(around 10 5 m/s),which effectively reduces the amount of time the plume remains in suspension.
      原文链接:
    • 万方数据
    • 维普

    Creep constitutive model considering nonlinear creep degradation of fractured rock

    Wang ChunpingLiu JianfengChen LiangLiu Jian...
    105-116页
    查看更多>>摘要：Stability analysis of underground constructions requires a model study of rock masses'long-term perfor-mance.Creep tests under different stress conditions was conducted on intact granite and granite samples fractured at 30° and 45° angles.The experimental results indicate that the steady creep strain rates of intact and fractured rock present an exponential increase trend with the increase of stress level.A non-linear creep model is developed based on the experimental results,in which the initial damage caused by fracture together with the damage caused by constant load have been taken into consideration.The fit-ting analysis results indicated that the model proposed is more accurate at identifying the full creep regions in fractured granite,especially the accelerated stage of creep deformation.The least-square fit error of the proposed creep model is significantly lower than that of Nishihara model by almost an order of magnitude.An analysis of the effects of elastic modulus,viscosity coefficient,and damage factors on fractured rock strain rate and creep strain is conducted.If no consideration is given to the effects of the damage,the proposed nonlinear creep model can degenerate into to the classical Nishihara model.
      原文链接:
    • 万方数据
    • 维普

    Intermittent disturbance mechanical behavior and fractional deterioration mechanical model of rock under complex true triaxial stress paths

    Zhi ZhengHongyu XuKai ZhangGuangliang Feng...
    117-136页
    查看更多>>摘要：Mechanical excavation,blasting,adjacent rockburst and fracture slip that occur during mining excavation impose dynamic loads on the rock mass,leading to further fracture of damaged surrounding rock in three-dimensional high-stress and even causing disasters.Therefore,a novel complex true triaxial static-dynamic combined loading method reflecting underground excavation damage and then frequent intermittent disturbance failure is proposed.True triaxial static compression and intermittent distur-bance tests are carried out on monzogabbro.The effects of intermediate principal stress and amplitude on the strength characteristics,deformation characteristics,failure characteristics,and precursors of monzogabbro are analyzed,intermediate principal stress and amplitude increase monzogabbro strength and tensile fracture mechanism.Rapid increases in microseismic parameters during rock loading can be precursors for intermittent rock disturbance.Based on the experimental result,the new damage frac-tional elements and method with considering crack initiation stress and crack unstable stress as initiation and acceleration condition of intermittent disturbance irreversible deformation are proposed.A novel three-dimensional disturbance fractional deterioration model considering the intermediate principal stress effect and intermittent disturbance damage effect is established,and the model predicted results align well with the experimental results.The sensitivity of stress states and model parameters is further explored,and the intermittent disturbance behaviors at different f are predicted.This study provides valuable theoretical bases for the stability analysis of deep mining engineering under dynamic loads.
      原文链接:
    • 万方数据
    • 维普

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