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Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 311-324页

作者： Qian Yin Fan Wen Zhigang Tao Hai Pu Tianci Deng Yaoyao Meng Qingbin Meng hongwen jing Bo Meng Jiangyu Wu State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious ***,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(P_(CNT))that satisfied fractal theory for the PSD of *** mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically *** results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at P_(CNT)of 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σ_(p)),axial peak strain(ε_(1,p)),elastic strain energy(Ue),and dissipated energy(U_(d))increased by 12.76%,29.60%,19.05%,and90.39%,***,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρ_(p),ε_(1,p),and the volumetric strain increment(Δε_(v))when P_(CNT)increases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the ***σ_(p)and U_(d)firstly increase and then decrease with increasing D,and porosity shows the opposite ***ε_(1,p)andΔε_(v)are negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε_(1,p)=0.05079,Δε_(v)=0.01990)due to the frictional slip effect caused by coarse *** increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure.

关键词： cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes

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Deformation and failure characteristics of anchorage structure of surrounding rock in deep roadway

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International Journal of Mining Science and Technology 2020年第5期30卷 593-604页

作者： hongwen jing Jiangyu Wu Qian Yin Ke Wang State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhouJiangsu 221116China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhouJiangsu 221116China

This paper investigated the stress evolution,displacement field,local deformation and its overall distribution,and failure characteristics of the anchorage structure of surrounding rock with different rockbolt spacing through the model *** influences of the pre-tightening force and spacing of rockbolt on the support strength of the anchorage structure of surrounding rock were analyzed by the simulation using FLAC3D numerical *** support scheme of the excavated roadway was then designed,and the effectiveness of this support scheme was further verified by the displacement measurement of the *** results showed that the maximum displacement between the roof and floor of the west wing track roadway in Kouzidong coal mine,China is about 42 mm,and the maximum displacement between its both sides is about 72 mm,indicating that the support scheme proposed in this study can ensure the stability and safety of the excavated roadway.

关键词： Deep roadway Anchorage structure Deformation failure Stress evolution Loading capacity

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Numerical simulations of failure behavior around a circular opening in a non-persistently jointed rock mass under biaxial compression

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International Journal of Mining Science and Technology 2016年第4期26卷 729-738页

作者： Yang Xuxu jing hongwen Chen Kunfu Rock Mass Modeling and Computational Rock Mechanics Laboratories University of Arizona State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology

Pre-existing discontinuities change the mechanical properties of rock masses,and further influence failure behavior around an underground *** present study,the failure behavior in both Inner and Outer zones around a circular opening in a non-persistently jointed rock mass under biaxial compression was investigated through numerical ***,the micro parameters of the PFC^(3D) model were carefully calibrated using the macro mechanical properties determined in physical experiments implemented on jointed rock ***,a parametrical study was undertaken of the effect of stress condition,joint dip angle and joint *** low initial stress,the confining stress improves the mechanical behavior of the surrounding rock masses;while under high initial stress,the surrounding rock mass failed immediately following *** small dip angles the cracks around the circular opening developed generally outwards in a step-path failure pattern;whereas,at high dip angles the surrounding rock mass failed in an instantaneous intact rock failure ***,the stability of the rock mass around the circular opening deteriorated significantly with increasing joint persistency.

关键词： Underground opening Failure behavior Non-persistent joints Rock mass PFC^3D

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Stress evolution and support mechanism of a bolt anchored in a rock mass with a weak interlayer

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International Journal of Mining Science and Technology 2017年第3期27卷 573-580页

作者： Ding Shuxue jing hongwen Chen Kunfu Xu Guo'an Meng Bo State Key Laboratory for Geomechanics & Deep Underground Engineering School of Mechanics and Civil Engineering China University of Mining & Technology Xuzhou 221116 China

By applying experimental method, the bolt stress and supporting mechanism is studied during the deformation process of a rock mass containing a weak interlayer. The force measuring bolt is installed manually and instrumented five pairs of symmetrical strain gauges. The experimental results show that the fully grouted bolt suffers tensile, compressive, bending and shear stress at the same time. The bolt stress evolution is closely related to the deformation stages of the rock mass which are very gradually varying stage, gradually varying stage at the pre-peak and suddenly varying stage at the post peak *** axial compressive stress in the bolt is mainly induced by the moment. Thus, in most cases the axial compressive stress is distributed on one side of the bolt. For axial stresses, induced by the axial force and the bending moment at the post-peak stage, three types of changing are observed, viz. increasingincreasing type, decreasing-increasing type and increasing-decreasing type. The stress characteristics of the bolt section in the weak interlayer are significantly different from those in the hard rock. The failure models of the anchored bolt are tensile failure and shear failure, respectively. The bolt not only provides constraints on the free surface of the rock mass, but also resists the axial and lateral loading by the bending moment. This study provides valuable guidelines for bolting support design and its safety assessment.

关键词： Fully grouted bolt Stress evolution Support mechanism Weak interlayer Deformation process

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Numerical simulation of oxide nanoparticle growth characteristics under the gas detonation chemical reaction by space-time conservation element-solution element method

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Particuology 2017年第6期15卷 78-83页

作者： Ning LUO Hua Shen hongwen jing Zhangguo Ma Weiming Yang State Key Laboratory for Geo-mechanics and Deep Underground Engineering School of Mechanics and Civil Engineering China University of Mining and Technology Xuzhou 221116 China Laboratory for Precision and Nano Processing Technologies School of Mechanical and Manufacturing Engineering The University of New South Wales Sydney 2052 Australia Department of Mechanics and Engineering Science College of Engineering Peking University Beijing 100871 Chino

Under harsh conditions （such as high temperature, high pressure, and millisecond lifetime chemical reaction）, a long-standing challenge remains to accurately predict the growth characteristics of nanosize spherical particles and to determine the rapid chemical reaction flow field characteristics, The growth characteristics of similar spherical oxide nanoparticles are further studied by successfully introducing the space-time conservation element-solution element （CE/SE） algorithm with the monodisperse Kruis model. This approach overcomes the nanosize particle rapid growth limit set and successfully captures the characteristics of the rapid gaseous chemical reaction process. The results show that this approach quantitatively captures the characteristics of the rapid chemical reaction, nanosize particle growth and size distribution. To reveal the growth mechanism for numerous types of oxide nanoparticles, it is very important to choose a rational numerical method and particle physics model.

关键词： Oxide nanoparticles Growth characteristics Space-time conservation element-solutionelement method Kruis model Gas detonation

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Strength and deformation behaviors of bedded rock mass under bolt reinforcement

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International Journal of Mining Science and Technology 2018年第4期28卷 591-597页

作者： Wenxin Zhu hongwen jing Lijun Yang Bing Pan Haijian Su State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology School of Traffic and Civil Engineering Shandong Jiaotong University

The mechanism of bolt support is an important topic in mining engineering and slope treatment. The artificial material and loading system were self-developed to study the influence of bedding cohesion and bolt number on the anchoring behavior of bedded rock mass. The results show that, both peak strength and elasticity modulus increase gradually with the increase of bedding cohesion and bolt number. The axial stress–strain curve of bedded rock mass under the reinforcement of bolts presents the features of strain-softening and secondary strengthening. Finally, anchoring behavior of bedded rock mass with different bolt numbers was simulated by using FLAC3 D numerical program and the results were compared with the experimental results. This study can provide certain bases to the stability control and support design of bedded rock mass in roadway.

关键词： Bedded rock mass Anchoring behavior Peak strength Bedding cohesion Secondary strengthening

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Experimental study on unloading induced shear performances of 3D saw-tooth rock fractures

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International Journal of Mining Science and Technology 2023年第4期33卷 463-479页

作者： Qian Yin Xinxin Nie Jiangyu Wu Qi Wang Kaiqi Bian hongwen jing State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of High Performance Civil Engineering Materials Jiangsu Research Institute of Building Science Co.Ltd.Nanjing 210008China Department of Materials University of OxfordOxford OX13PHUK State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China

A fractal model governing saw-tooth fractures was first introduced to replicate sandstone samples containing an inclined 3D penetrating rough fracture surface with various joint roughness coefficients(JRC).In conventional triaxial compression,the peak strength for fractured samples increased with both confining pressure and *** the unloading confining pressure process,the normal stress of fractures declined but the shear stress increased,resulting in shear sliding of *** shear displacement of fractures exponentially increased,and the positive normal displacement decreased gradually to negative values under coupling effects of shear contraction caused by normal stress and shear dilation due to climbing effects of *** from quasi-static to dynamic sliding of the fractures was *** sliding resistance duration increased with confining pressure but decreased with *** prepeak unloading,the fracture surfaces presented a more significant surface wear response and JRC values decreased by 1.70%–59.20%due to more remarkable asperity degradation compared with those after conventional triaxial *** theoretical model for shear strength of fractures was established through improving the Ladanyi&Archambault model by introducing the relations between normal stress and surface wear ratios of fractures,which agreed well with the experimental results.

关键词： Saw-tooth fracture surfaces Pre-peak unloading Shear sliding Normal displacement JRC values

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Fracture evolution characteristics of sandstone containing double fissures and a single circular hole under uniaxial compression

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International Journal of Mining Science and Technology 2017年第3期27卷 499-505页

作者： Chen Minliang jing hongwen Ma Xiujun Su Haijian Du Mingrui Zhu Tantan State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining & Technology Xuzhou 221116 China Tianjin Traffic Science Research Institute Tianjin 300074 China JSTI GROUP Nanfing 210000 China

The uniaxial compression experiments on the sandstone samples containing double fissures and a single circular hole were carried out by using electro-hydraulic servo universal testing machine to investigate the effect of rock bridge angle β and fissure angle α on mechanical properties and evolution characteristics of *** results show that the peak strength,peak strain and elastic modulus of defected specimens decrease comparing with those for intact sample,and show a decreased trend firstly and then increase with β changing from 0° to 90°.The peak strength and elastic modulus achieve the minimum value as the rock bridge angle is 60°,while the peak strain reaches the minimum value with the rock bridge angle of 45°.The crack initiation of tested rock samples occurs firstly in stress concentration areas at tips of prefabricated fissures under uniaxial compression,and then propagates constantly and coalescences with the prefabricated *** secondary cracks initiate and propagate as well until buckling failure *** rock bridge angle has a great influence on crack initiation,coalescence,final failure mode,crack initiation stress and transfixion *** peak strength varies significantly,while the elastic modulus and peak strain change slightly,and the failure modes are also different due to the influence of fissure angle.

关键词： Double fissures A single circular hole Strength characteristics Crack propagation Failure mode

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Fast determination of meso-level mechanical parameters of PFC models

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International Journal of Mining Science and Technology 2013年第1期23卷 157-162页

作者： Guo Jianwei Xu Guoan jing hongwen Kuang Tiejun School of Safety Engineering China University of Mining & Technology Energy and Chemical Research Institute of Zhong Ping Shen Ma Group State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology School of Mechanics and Civil Engineering China University of Mining & Technology Sitai Coal Mine Datong Coal Mine Group

To solve the problems of blindness and inefficiency existing in the determination of meso-level mechanical parameters of particle flow code (PFC) models, we firstly designed and numerically carried out orthogonal tests on rock samples to investigate the correlations between macro-and meso-level mechanical parameters of rock-like bonded granular materials. Then based on the artificial intelligent technology, the intelligent prediction systems for nine meso-level mechanical parameters of PFC models were obtained by creating, training and testing the prediction models with the set of data got from the orthogonal tests. Lastly the prediction systems were used to predict the meso-level mechanical parameters of one kind of sandy mudstone, and according to the predicted results the macroscopic properties of the rock were obtained by numerical tests. The maximum relative error between the numerical test results and real rock properties is 3.28% which satisfies the precision requirement in engineering. It shows that this paper provides a fast and accurate method for the determination of meso-level mechanical parameters of PFC models.

关键词： Particle flow code Meso-level mechanical parameter Macroscopic property Orthogonal test Intelligent prediction

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Stability Control of Gob-Side Entry Retaining in Fully Mechanized Caving Face Based on a Compatible Deformation Model

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Computer Modeling in Engineering & Sciences 2020年第7期124卷 315-343页

作者： Xinshuai Shi hongwen jing Jianguo Ning Zhenlong Zhao Junfu Zhu State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China College of Mining and Safety Engineering Shandong University of Science and TechnologyQingdao266510China.

The stability control of gob-side entry retaining in fully mechanized caving face is a typical challenge in many coal mines in *** rotation and subsidence of the lateral cantilever play a critical role in a coal mine,possibly leading to instability in a coal seam wall or a gob-side wall due to its excessive rotation ***,the presplitting blasting measures in the roof was implemented to cut down the lower main roof and convert it to caved immediate roof strata,which can significantly reduce the rotation space for the lateral cantilever and effectively control its ***,the compatible deformation model was established to investigate the quantitative relationship between the deformation of the coal seam wall and the gob-side wall and the subsidence of the lateral ***,the instability judgments for the coal seam wall and gob-side wall were revealed,and the determination method for the optimal roof cutting height were ***,The Universal Distinct Element Code numerical simulation was adopted to investigate the effect of roof-cutting height on the stability of the retained *** numerical simulation results indicated that the deformation of the roadway could be effectively controlled when the roofcutting height reached to 18 m,which verified the theoretical deduction ***,a field application was performed at the No.3307 haulage gateway in the Tangan coal mine,Ltd.,Shanxi Province,*** field monitoring results showed that the blasting roof cutting method could effectively control the large deformation of surrounding rocks,which provided helpful references for coal mine safety production under similar conditions.

关键词： Gob-side entry retaining fully mechanized caving face lateral cantilever

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