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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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    Research progress and application of deep in-situ condition preserved coring and testing

    Heping XieYunqi HuMingzhong GaoLing Chen...
    1319-1337页
    查看更多>>摘要：With the depletion of shallow resources,the exploration of deep earth resources has become a global strategy.The study of the different patterns in the physical mechanical properties of rocks at different occurrence depths is the basis for exploring deep into the earth,with the core and premise being the acquisition and testing of deep in-situ core specimens.Based on the original idea of deep in-situ condition preserved coring(ICP-Coring)and testing,combined with theoretical modeling,numerical analysis,test platform development,indoor testing and engineering application,the principles and technologies of deep ICP-Coring are developed.This principle and technology consists of five parts:in-situ pressure-preserved coring(IPP-Coring),in-situ substance-preserved coring(ISP-Coring),in-situ temperature-preserved coring(ITP-Coring),in-situ light-preserved coring(ILP-Coring),and in-situ moisture-preserved coring(IMP-Coring).The theory and technology of temperature and pressure reconstruction at different occurrence depths and in different environments are proposed,and prototype trial produc-tion was completed by following the principle of displacement and tests based on the in-situ recon-structed environment.The notable advances are as follows:(1)Deep in-situ coring system:A pressure-preserved controller with an ultimate bearing capacity greater than 140 MPa,high-performance(temperature-resistant,pressure-resistant,and low thermally conductive)temperature-preserved materials,an active temperature control system,and high-barrier quality-preserved mem-brane materials were developed;a deep ICP-Coring capacity calibration platform was independently developed,a deep in-situ coring technology system was developed,and the acquisition of deep in-situ cores was realized.(2)In-situ storage displacement system:Following the dual-circuit hydraulic design idea,a single-drive source push-pull composite grabbing mechanism was designed;the design of the overall structure for the deep in-situ displacement storage system and ultrahigh pressure cabin structure was completed,which could realize docking the coring device and core displacement in the in-situ recon-structed environment.(3)Test analysis system:A noncontact acoustic-electric-magnetic test system was developed under the in-situ reconstructed environment,and the errors between the test results and tra-ditional contact test results were mostly less than 10%;a detachable deep in-situ core true triaxial test system was developed,which could perform loading tests for deep in-situ cores.The relevant technolog-ical achievements were successfully applied to the exploration and development of deep resources,such as deep mines,deep-sea natural gas hydrates,and deep oil and gas.The research results provide technical and equipment support for the construction of a theoretical system for deep in-situ rock mechanics,the development of deep earth resources and energy,and the scientific exploration of different layers and occurrence depths(deep and ultradeep)of the Earth.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Numerical analysis on mechanical difference of sandstone under in-situ stress,pore pressure preserved environment at depth

    Hongwei ZhouMingyuan LuHeping XieWenhao Jia...
    1339-1350页
    查看更多>>摘要：Deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties,differentiating it from traditional rock mechanics.To investigate the effect of in-situ stress,pore pressure preserved environment on the mechanical difference of sandstone,four tests are numerically modeled by COMSOL:conventional triaxial test,conventional pore pressure test,in-situ stress restoration and recon-struction test,and in-situ pore pressure-preserved test(not yet realized in the laboratory).The in-situ stress restoration parameter is introduced to characterize the recovery effect of in-situ stress on elastic modulus and heterogeneous distribution of sandstone at different depths.A random function and non-uniform pore pressure coefficient are employed to describe the non-uniform distribution of pore pressure in the in-situ environment.Numerical results are compared with existing experimental data to validate the models and calibrate the numerical parameters.By extracting mechanical parameters from numerical cores,the stress-strain curves of the four tests under different depths,in-situ stress and pore pressure are compared.The influence of non-uniform pore pressure coefficient and depth on the peak strength of sandstone is analyzed.The results show a strong linear relationship between the in-situ stress restoration parameter and depth,effectively characterizing the enhanced effect of stress restoration and reconstruc-tion methods on the elastic modulus of conventional cores at different depths.The in-situ pore pressure-preserved test exhibits lower peak stress and peak strain compared to the other three tests,and sand-stone subjected to non-uniform pore pressure is more prone to plastic damage and failure.Moreover,the influence of non-uniform pore pressure on peak strength gradually diminished with increasing depth.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Development of a pressure coring system for the investigation of deep underground exploration

    Da GuoLing ChenZhongya ZhouDingming Wang...
    1351-1364页
    查看更多>>摘要：To provide a more accurate evaluation of the scale of deep underground resources,a new pressure coring system was carefully developed and its strength and safety of the engineering were verified by theoret-ical analyses and numerical simulation.The designed pressure coring system can obtain cores with length of 3 m and diameter of 50 mm at 70 MPa.The results of the ball-drop operation experiment demonstrate that differential motion assembly can effectively cut a safety pin by applying a tensile force of 4852 N,and it can lift the core tube through the center pole to complete a series of mechanical actions to seal the pressure.Additionally,by maintaining pressures at 70 MPa for 30 min,the pressure sealing capacity of the system was proven.Furthermore,a core sample with a diameter of 50 mm was obtained through a core drilling experiment and the coring performance of the pressure coring system was veri-fied.This study can not only enrich the existing onshore coring technology but also provide a theoretical guide and design criteria for the development of similar pressure coring systems to meet the demand for deeper underground exploration.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    A graphene-enhanced high-barrier and fast-curing film for deep in situ condition preserved coring in coal seams

    Dongsheng YangZhiyu ZhaoYifan WuLiangyu Zhu...
    1365-1376页
    查看更多>>摘要：Scientific research on deep in situ resources is highly important to the theory and technology system con-struction for deep in-situ resource exploitation.To obtain high-condition preserved core samples,it is vital to maintain the original material,humidity and luminous flux information inside the core.Therefore,this study proposes a research and development strategy for a high-toughness and high-barrier sealing film based on the molecular structure design and filler synergistic enhancement via a deep solid-state sealing film using in situ substance preservation(ISP),in situ moisture preservation(IMP)and in situ light preservation(ILP)coring principles.A graphene/epoxy composite sealing film with a high barrier,high strength and high toughness was developed.The oxygen permeability of the film was 0.23 cm3/(m2·d),the water vapor permeability was 1.26 g/(m2·d),and the light transmittance was 0.The tensile strength reached 15.4 MPa,and the toughness was 5242.9 kJ/m3.The results from the film substance and moisture preservation performance verification experiments showed that the sealing film had an excellent sealing effect on small molecules,such as water,alkanes and even ions,which further verified that the sealing film greatly contributed to the maintenance and preservation of deep in-situ resource reserves and abundance.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Design and development of the deep-rock in-situ condition-preserved coring calibration platform

    Yihang LiHeping XieRu ZhangZetian Zhang...
    1377-1395页
    查看更多>>摘要：To systematically validate and calibrate the theory and technology of the deep in-situ condition-preserved coring,the in-situ conditions at different depths should be simulated,and the full-size coring tests should be carried out in this simulated environment.Therefore,a deep-rock in-situ condition-preserved coring calibration platform was designed and developed.The self-tightening sealing structure and the quick-disassembly structure were designed on the basis of an innovative segmented nonuniform-diameter structure,which was a breakthrough from the traditional high-pressure vessel frame and was verified by finite element simulation and actual testing under extreme working conditions,respectively.To simulate the actual deep in-situ environment with a temperature of 150°C and pressure of 140 MPa for a large Φ450 mm×H1400 mm core,temperature and pressure control systems were designed by cou-pling,and a pre-embedded high-pressure-resistant temperature sensor was designed.Finally,high-precision assembly automation,complex movement coordination of the coring device with the platform,and rotary dynamic sealing were achieved by utilizing the combination of adaptive cabin body servo con-trol and an adaptive mechanical structure in a limited space,laying a solid foundation for the calibration of in-situ condition-preserved coring.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Study of a low-disturbance pressure-preserving corer and its coring performance in deep coal mining conditions

    Wei HuangJianan LiZhiqiang LiuMingqing Yang...
    1397-1410页
    查看更多>>摘要：With the increasing depth of coal mining,the requirements for coring devices that maintain pressure are increasing.To adapt to the special environment in deep coal seams and improve the accuracy of testing gas content,a low-disturbance pressure-preserving corer was developed.The measurement of gas con-tent using this corer was analyzed.The coring test platform was used to complete a coring function test.A pressurized core with a diameter of 50 mm was obtained.The pressure was 0.15 MPa,which was equal to the pressure of the liquid column of the cored layer,indicating that the corer can be successfully used in a mud environment.Next,a pressure test of the corer was conducted.The results showed that under conditions of low pressure(8 MPa)and high pressure(25 MPa),the internal pressure of the corer remained stable for more than 1 h,indicating that the corer has good ability to maintain pressure.Therefore,the corer can be applied at deep coal mine sites.The results of this research can be used to promote the safe exploitation of deep coal mines and the exploitation of methane resources in coalbeds.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Selection and thermal physical characteristics analysis of in-situ condition preserved coring lunar rock simulant in extreme environment

    Haichun HaoMingzhong GaoCunbao LiXuan Wang...
    1411-1424页
    查看更多>>摘要：With the increasing scarcity of Earth's resources and the development of space science and technology,the exploration,development,and utilization of deep space-specific material resources(minerals,water ice,volatile compounds,etc.)are not only important to supplement the resources and reserves on Earth but also provide a material foundation for establishing extraterrestrial research bases.To achieve large depth in-situ condition-preserved coring(ICP-Coring)in the extreme lunar environment,first,lunar rock simulant was selected(SZU-1),which has a material composition,element distribution,and physical and mechanical properties that are approximately equivalent to those of lunar mare basalt.Second,the influ-ence of the lunar-based in-situ environment on the phase,microstructure,and thermal physical proper-ties(specific heat capacity,thermal conductivity,thermal diffusivity,and thermal expansion coefficient)of SZU-1 was explored and compared with the measured lunar rock data.It was found that in an air atmo-sphere,low temperature has a more pronounced effect on the relative content of olivine than other tem-peratures,while in a vacuum atmosphere,the relative contents of olivine and anorthite are significantly affected only at temperatures of approximately-20 and 200 °C.When the vacuum level is less than 100 Pa,the contribution of air conduction can be almost neglected,whereas it becomes dominant above this threshold.Additionally,as the testing temperature increases,the surface of SZU-1 exhibits increased microcracking,fracture opening,and unevenness,while the specific heat capacity,thermal conductivity,and thermal expansion coefficient show nonlinear increases.Conversely,the thermal diffusivity exhibits a nonlinear decreasing trend.The relationship between thermal conductivity,thermal diffusivity,and temperature can be effectively described by an exponential function(R2>0.98).The research results are consistent with previous studies on real lunar rocks.These research findings are expected to be applied in the development of the test and analysis systems of ICP-Coring in a lunar environment and the explo-ration of the mechanism of machine-rock interaction in the in-situ drilling and coring process.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普

    Direct measurement and theoretical prediction model of interparticle adhesion force between irregular planetary regolith particles

    Heping XieQi WuYifei LiuYachen Xie...
    1425-1436页
    查看更多>>摘要：Interparticle adhesion force has a controlling effect on the physical and mechanical properties of plane-tary regolith and rocks.The current research on the adhesion force of planetary regolith and rock particles has been primarily based on the assumption of smooth spherical particles to calculate the intergranular adhesion force;this approach lacks consideration for the adhesion force between irregular shaped parti-cles.In our study,an innovative approach was established to directly measure the adhesion force between the arbitrary irregular shaped particles;the probe was modified using simulated lunar soil par-ticles that were a typical representation of planetary regolith.The experimental results showed that for irregular shaped mineral particles,the particle size and mineral composition had no significant influence on the interparticle adhesion force;however,the complex morphology of the contact surface predomi-nantly controlled the adhesion force.As the contact surface roughness increased,the adhesion force grad-ually decreased,and the rate of decrease gradually slowed;these results were consistent with the change trend predicted via the theoretical models of quantum electrodynamics.Moreover,a theoretical model to predict the adhesion force between the irregular shaped particles was constructed based on Rabinovich's theory,and the prediction results were correlated with the experimental measurements.
      原文链接:
    • NETL
    • NSTL
    • 万方数据
    • 维普