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层状盐岩力学和变形特性数值试验研究 被引量:22
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作者 王安明 杨春和 +1 位作者 黄诚 李银平 《岩土力学》 EI CAS CSCD 北大核心 2009年第7期2173-2178,共6页
对含泥岩夹层层状盐岩力学和变形特性进行有限元分析。首先,用数值试验方法预测含泥岩夹层层状盐岩体宏观等效弹性力学参数,然后,建立层状盐岩复合体细观有限元模型,研究其在单轴和三轴压缩荷载下盐岩、泥岩以及界面细观应力应变场分布... 对含泥岩夹层层状盐岩力学和变形特性进行有限元分析。首先,用数值试验方法预测含泥岩夹层层状盐岩体宏观等效弹性力学参数,然后,建立层状盐岩复合体细观有限元模型,研究其在单轴和三轴压缩荷载下盐岩、泥岩以及界面细观应力应变场分布特征、应力集中问题,并将上述研究与已有的理论和试验成果进行对比。结果表明,运用细观有限元方法预测层状盐岩宏观弹性力学参数是一种直观有效的方法;泥岩和盐岩力学特性上的不匹配导致在层状盐岩的泥岩夹层中以及界面边缘处存在较为明显的应力集中和差异变形。单轴压缩时,泥岩体由于侧向变形能力差会受到横向拉伸应力作用而盐岩层则相应的受到横向压应力作用,三轴压缩时因围压和偏应力大小不同层状盐岩细观应力应变场分布特征则更为复杂;此方法能更为直观的分析层状盐岩的变形和破损特征,这一分析结果对进一步进行层状盐岩体内油(气)储库硐室稳定性分析提供了理论基础。 展开更多
关键词 层状盐岩 夹层 细观应力应变 应力集中
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Effect of jet milling on micro-strain behavior and rupture behavior of agglomerates of ultrafine WC powders 被引量:7
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作者 Ya-li SUN Qing-cai LIU +3 位作者 Xin HUANG Fa-xing ZHANG Jian YANG Hua MEI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第10期2128-2140,共13页
The Williamson-Hall and uniaxial compression methods were used to study the variations of the micro-strain and stress-strain relations in WC powders after jet milling and ball milling, respectively. The rupture behavi... The Williamson-Hall and uniaxial compression methods were used to study the variations of the micro-strain and stress-strain relations in WC powders after jet milling and ball milling, respectively. The rupture behavior of agglomerates in WC powders was investigated. Meanwhile, the as-obtained WC powders treated by different milling methods were used to fabricate WC-10%Co cemented carbides, followed by the performance assessment of cemented carbides. The results show that the micro-strain of the jet-milled WC powders decreases significantly compared with that of the ball-milled WC powders, and that the cemented carbides prepared by jet-milled WC powders exhibit excellent properties with a transverse-rupture strength of 4260 MPa, due to the elimination of agglomerates and the reduction of lattice strain. 展开更多
关键词 ultrafine WC powder micro-strain stress-strain relation jet milling agglomerate rupture mechanism
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A numerical study of macro-mesoscopic mechanical properties of gangue backfill under biaxial compression 被引量:8
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作者 Huang Zhimin Ma Zhanguo +3 位作者 Zhang Lei Gong Peng Zhang Yankun Liu Fei 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第2期309-317,共9页
Based on the Particle Flow Code(PFC^(2D)) program,we set up gangue backfill models with different gangue contents and bond strength,and studied the stress-strain behaviours,the pattern of shear band and force chains,m... Based on the Particle Flow Code(PFC^(2D)) program,we set up gangue backfill models with different gangue contents and bond strength,and studied the stress-strain behaviours,the pattern of shear band and force chains,motion and fragmentation of particles under biaxial compression.The results show that when the bond strength or contents of gangue are high,the peak strength is high and the phenomena of post-peak softening and fluctuation are obvious.When gangue contents are low,the shape of the shear band is symmetrical and most strong force chains transfer in soil particles.With an increase in gangue content,the shape of the shear band becomes irregular and the majority of strong force chains turn to transfer in gangue particles gradually,most of which distribute along the axial direction.When the gangue content is higher than 50%,the interconnectivity of strong force chains decreases gradually:at the same time,the strong force chains become tilted and the stability of the system tends to decrease.With an increase in external loading,the coordination numbers of the system increase at first and then decrease and the main pattern of force chains changes into columnar from annular.However,after the forming of the advantageous shear band,the force chains external to the shear band maintain their columnar shape while the inner ones bend obviously.As a result,annular force chains form. 展开更多
关键词 Gangue backfills Particle flow Biaxial compression Shear band Force chain
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A continuum model of jointed rock masses based on micromechanics and its integration algorithm 被引量:2
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作者 ZHU FuWei DUI GuanSuo REN QingWen 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第3期581-590,共10页
The paper is devoted to proposing a constitutive model based on micromechanics. The joints in rock masses are treated as penny-shaped inclusion in solid but not through structural planes by considering joint density, ... The paper is devoted to proposing a constitutive model based on micromechanics. The joints in rock masses are treated as penny-shaped inclusion in solid but not through structural planes by considering joint density, closure effect, joint geometry. The mechanical behavior of the joints is represented by an elasto-plastic constitutive law. Mori-Tanaka method is used to derive the relationship between the joint deformations and macroscopic strains. The incremental stress-strain relationship of rock masses is formulated by taking the volume average of the representative volume element. Meanwhile, the behavior of joints is obtained. By using implicit integration algorithms, the consistent tangent moduli are proposed and the method of updating stresses and joint displacements is presented. Some examples are calculated by ABAQUS user defined material subroutine based on this model. 展开更多
关键词 joint rock masses constitutive integration algorithms ABAQUS Mori-Tanaka MICROMECHANICS consistent tangent moduli
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