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| 1 | Effect of particle gradation characteristics on yield stress of cemented paste backfill显示文摘Along with slurry concentration and particle density,particle size distribution(PSD)of tailings also exerts a significant influence on the yield stress of cemented paste,a non-Newtonian fluid.In this work,a paste stability coefficient(PSC)was proposed to characterize paste gradation and better reveal its connection to yield stress.This coefficient was proved beneficial to the construction of a unified rheological model,applicable to different materials in different mines,so as to promote the application of rheology in the pipeline transportation of paste.From the results,yield stress showed an exponential growth with increasing PSC,which reflected the proportion of solid particle concentration to the packing density of granular media in a unit volume of slurry,and could represent the properties of both slurry and granular media.It was found that slurry of low PSC contained extensive pores,generally around 20μm,encouraging free flow of water,constituting a relatively low yield stress.In contrast,slurry of high PSC had a compact and quite stable honeycomb structure,with pore sizes generally<5μm,causing the paste to overcome a higher yield stress to flow. | Hai-yong Cheng Shun-chuan Wu Xiao-qiang Zhang Ai-xiang Wu | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，1： | 15 |
| 2 | 深部金属矿产资源开发面临的挑战及新见解显示文摘长期持续的大规模开采使浅部金属矿产资源日益枯竭,深部开采已成为必然。介绍了当前全球金属矿产资源深部开采现状,系统梳理深部开采面临的一系列工程挑战,重点探讨在岩爆预测与防控、深井降温制冷技术、围岩支护技术、深井提升技术及一些非传统深部开采技术等关键工程技术方面取得的一些进展和未来创新重点。同时,对深部开采技术发展战略提出一些新的见解。这些前瞻性关键创新技术的集成,将形成金属矿深部开采创新技术体系的整体框架。该技术体系将有助于实现深部金属矿产资源的安全、高效、绿色开采,保障金属矿业的可持续发展。 | 李鹏 蔡美峰 | 2021 | Transactions of Nonferrous Metals Society of China2021，31，11： | 14 |
| 3 | 单轴加载下节理围岩的能量演化机制及破坏准则显示文摘基于单轴加载试验和岩石能量原理,研究了含孔洞交叉节理试样在变形破坏过程中的能量演化机制和破坏准则。结果表明,试样的能量演化特征属于典型的损伤渐进破坏模式。试样的峰值点总能量、弹性能和破坏时输入的总能量均随着交叉节理半夹角的增加整体呈先减小后增大的趋势,在半夹角为45°时最小,而耗散能随着半夹角的增加呈增大趋势。孔洞和交叉节理的存在明显削弱了岩石的储能能力,节理夹角的变化对峰前的弹性能比例影响较大,导致输入能量的分配规律存在一定差异。能量耗散比变化率的连续突变和随后的急剧突变可分别作为试样裂纹萌生与扩展以及失稳破坏的判据。 | 李鹏 蔡美峰 | 2021 | Journal of Central South University2021，28，6： | 12 |
| 4 | Mechanism investigation on coal and gas outburst: An overview显示文摘Coal and gas outburst is a frequent dynamic disaster during underground coal mining activities.After about 150 years of exploration,the mechanisms of outbursts remain unclear to date.Studies on outburst mechanisms worldwide focused on the physicochemical and mechanical properties of outburst-prone coal,laboratory-scale outburst experiments and numerical modeling,mine-site investigations,and doctrines of outburst mechanisms.Outburst mechanisms are divided into two categories:single-factor and multi-factor mechanisms.The multi-factor mechanism is widely accepted,but all statistical phenomena during a single outburst cannot be explained using present knowledge.Additional topics about outburst mechanisms are proposed by summarizing the phenomena that need precise explanation.The most appealing research is the microscopic process of the interaction between coal and gas.Modern physical-chemical methods can help characterize the natural properties of outburst-prone coal.Outburst experiments can compensate for the deficiency of first-hand observation at the scene.Restoring the original outburst scene by constructing a geomechanical model or numerical model and reproducing the entire outburst process based on mining environment conditions,including stratigraphic distribution,gas occurrence,and geological structure,are important.Future studies can explore outburst mechanisms at the microscale. | Yan-kun Ma Bai-sheng Nie Xue-qiu He Xiang-chun Li Jun-qing Meng Da-zhao Song | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，7： | 12 |
| 5 | 基于HHT分析的岩体单轴加载声发射波形特征显示文摘声发射波形包含煤岩体失稳破坏的微观细致结构特征,为了得到煤岩体在不同加载阶段更多的煤岩失稳细观结构特征,本文采用HHT方法对不同加载阶段的声发射波形特征进行分析。研究结果表明,HHT可以将目标波形分解成多个IMF分量,能量主要集中在c1~c4 IMF分量,其中c1分量频率最高,能量也最大,随着加载进行低频IMF分量所占的能量比例呈现增加的趋势。Hilbert边际谱在初始压密阶段集中在0~40 kHz的低频部分,塑性变形阶段在0~25 kHz和200~350 kHz的范围内有明显的能量集聚特征,而在失稳破坏时集中在0~25 kHz,并在20 kHz时达到最大。各个阶段均有一个较为明显的瞬时能量峰值,在初始压密和压密结束阶段波形的瞬时能量峰值较高,但由于波形有效持续时间较短,携带的总体能量较小,破坏时瞬时能量高值持续时间较长,波形的总能量达到最大。Hilbert三维能量谱在真实能量为0的区域,其能量谱一般为0,并且分布是断续而非连续的,跟前述几个动态范围的特点是一致的,但更为明显地表明了失稳破坏临界阶段的能量低频集聚。该研究反映了煤岩失稳破坏演化过程的地球物理信号的响应规律,为监测煤岩动力灾害提供依据。 | 李学龙 陈绍杰 刘淑敏 李忠辉 | 2021 | Journal of Central South University2021，28，6： | 10 |
| 6 | Long-term mechanical behavior and characteristics of cemented tailings backfill through impact loading显示文摘Cemented tailings backfill(CTB)structures are important components of underground mine stopes.It is important to investigate the characteristics and dynamic behavior of CTB materials because they are susceptible to disturbance by dynamic loading,such as excavation and blasting.In this study,the authors present the results of a series of Split-Hopkinson pressure bar(SHPB)single and cyclic impact loading tests on CTB specimens to investigate the long-term dynamic mechanical properties of CTB.The stress-strain relationship,dynamic strength,and dynamic failure characteristics of CTB specimens are analyzed and discussed to provide valuable conclusions that will improve our knowledge of CTB long-term mechanical behavior and characteristics.For instance,the dynamic peak stress under cyclic impact loading is approximately twice that under single impact loading,and the CTB specimens are less prone to fracture when cyclically loaded.These findings and conclusions can provide a new set of references for the stability analysis of CTB materials and help guide mine designers in reducing the amount of binding agents and the associated mining cost. | Yu-ye Tan Elmo Davide Yu-cheng Zhou Wei-dong Song Xiang Meng | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，2： | 6 |
| 7 | Mechanical properties and energy evolution of jointed rock specimens containing an opening under uniaxial loading显示文摘To investigate the impact of an opening and joints with different inclination angles on the mechanical response behavior,the energy evolution characteristics,and distribution law of granite specimens,uniaxial loading tests were performed on the parallel jointed rock samples with an opening.Results indicated an initial decreasing trend of the strength and deformation parameters,which later increases with increased inclination angle,reaching minimum values when the inclination angle is 45°.Evolution curves of the elastic strain energy and dissipated energy with strain of the samples showed step-like gradual mutation characteristics.The peak total energy,peak elastic strain energy,peak dissipated energy,and total input energy during the failure of the samples showed significant nonlinear characteristics with increasing inclination angle.The opening and joints as well as the change of the inclination angle had significant influences on the proportion of the elastic strain energy of the samples prior to the peak,resulting in the difference of the distribution law of input energy.Moreover,the energy mechanism of the sample failure was discussed.Results showed that the energy release was the internal cause of the sudden destruction of the entire rock mass. | Peng Li Mei-feng Cai Pei-tao Wang Qi-feng Guo Sheng-jun Miao Fen-hua Ren | 2021 | International Journal of Minerals,Metallurgy and Materials2021，28，12： | 3 |
| 8 | Evaluation and classification of rock heterogeneity based on acoustic emission detection显示文摘For deep rock mechanics and subsurface engineering,accurately characterizing and evaluating rock heterogeneity as well as analyzing the correlation between the heterogeneity and physical and mechanical properties of rocks are critical.This study investigated the characteristics of acoustic emission signals produced in the process of strong and weak phase damage to rocks.The failure mechanisms of the strong and weak phases were analyzed by performing Brazilian splitting tests on different metagabbros and granites.The strong-weak phase ratio of the rocks and the uniformity of their spatial distribution were characterized.Test results show that as the feldspar develops,the strong-phase ratio of the metagabbro increases.However,the spatial distribution of feldspar minerals in the metagabbro becomes less uniform.The mineral spatial distribution uniformity in the altered granite is good;however,its strong-phase ratio is low.Furthermore,the strong-phase ratio of the typical granite is high;however,its mineral spatial distribution uniformity is poor.Moreover,uniaxial and triaxial test results show that the peak strength and elastic modulus of the rocks are related to the strong-weak phase ratio and mineral spatial distribution uniformity of the rocks.This study provides a new analytical method for the mechanical evaluation of deep rocks. | Tongzhao Zhang Hongguang Ji Xiaobo Su Shuang You Daolu Quan Zhou Zhang Jinzhe Li | 2022 | International Journal of Minerals,Metallurgy and Materials2022，29，12： | 1 |
| 9 | Damage evolution of rock-encased-backfill structure under stepwise cyclic triaxial loading显示文摘Rock-encased-backfill(RB)structures are common in underground mining,for example in the cut-andfill and stoping methods.To understand the effects of cyclic excavation and blasting activities on the damage of these RB structures,a series of triaxial stepwise-increasing-amplitude cyclic loading experiments was conducted with cylindrical RB specimens(rock on outside,backfill on inside)with different volume fractions of rock(VF=0.48,0.61,0.73,and 0.84),confining pressures(0,6,9,and 12 MPa),and cyclic loading rates(200,300,400,and 500 N/s).The damage evolution and meso-crack formation during the cyclic tests were analyzed with results from stress-strain hysteresis loops,acoustic emission events,and post-failure X-ray 3D fracture morphology.The results showed significant differences between cyclic and monotonic loadings of RB specimens,particularly with regard to the generation of shear microcracks,the development of stress memory and strain hardening,and the contact forces and associated friction that develops along the rock-backfill interface.One important finding is that as a function of the number of cycles,the elastic strain increases linearly and the dissipated energy increases exponentially.Also,compared with monotonic loading,the cyclic strain hardening characteristics are more sensitive to rising confining pressures during the initial compaction stage.Another finding is that compared with monotonic loading,more shear microcracks are generated during every reloading stage,but these microcracks tend to be dispersed and lessen the likelihood of large shear fracture formation.The transition from elastic to plastic behavior varies depending on the parameters of each test(confinement,volume fraction,and cyclic rate),and an interesting finding was that the transformation to plastic behavior is significantly lower under the conditions of 0.73 rock volume fraction,400 N/s cyclic loading rate,and 9 MPa confinement.All the findings have important practical implications on the ability of backfill to support underground excavations. | Xin Yu Yuye Tan Weidong Song John Kemeny Shengwen Qi Bowen Zheng Songfeng Guo | 2024 | Journal of Rock Mechanics and Geotechnical Engineering2024，16，2： | 0 |
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