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基于纳米压痕的页岩微观力学性质分析
Analysis of Shale Micromechanics Based on Nanoindentation
投稿时间: 2017-03-21  最后修改时间: 2017-05-25
DOI:
中文关键词:  纳米压痕  页岩  弹性模量  硬度  扫描电镜(SEM)
英文关键词:nanoindentation  shale  elastic modulus  hardness  SEM
基金项目:
作者单位E-mail
刘圣鑫 中国地质科学院地质力学研究所 807227351@qq.com 
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中文摘要:
      通过引入纳米压痕技术研究了川南地区五峰-龙马溪组页岩的微观力学性质。定量化研究了页岩脆性颗粒和有机粘土复合体以及不同纹层的弹性模量和硬度,分析了影响其微观力学性质的主控因素。研究结果表明:页岩中不同矿物、不同纹层之间的力学性质差异较大。其中脆性矿物颗粒的弹性模量和硬度最大,有机质粘土复合体颗粒的最小;纹层的力学性质介于两种颗粒之间,富含碎屑颗粒的纹层要高于富含粘土颗粒的纹层;页岩中矿物颗粒的弹性模量与硬度之间存在正相关性,纹层的弹性模量随硬度的增大呈非线性增大。影响页岩力学性质的因素可分为两类,分别是软组份和硬组份两类,弹性模量和硬度与软组份之间存在负相关性,与硬组份呈正相关。
英文摘要:
      The method of nanoindentation was used to investigate the microscopic mechanical properties of shale came from the Wufeng Formation and Longmaxi Formation in Nanchuan area, Sichuan, China. The elastic modulus and hardness of shale brittle particles and organo-clay complex and different bedding plane were obtained, and the main factors affecting the micro - mechanical properties of shale were analyzed. The results shows that the mechanical properties of different minerals and different bedding planes of shale are quite different. The difference in the microscopic mechanical properties of the shale comes from its own composition, structure, and strong heterogeneity. The elastic modulus and hardness of the brittle mineral particles are much larger than the elastic modulus and hardness of the organic-clay complex. The mechanical properties of the bedding plane are between the two particles, the elastic modulus and hardness of the debris-rich bedding plane are higher than those of the clay-rich grains. There is a positive correlation between the elastic modulus and the hardness of the mineral grains, and the elastic modulus of the bedding plane increases nonlinearly with the increase of the hardness. The factors affecting the mechanical properties of shale can be divided into two categories, soft and hard components, there is a negative correlation between the elastic modulus and hardness and the soft component content of shale, which is positively correlated with the hard component.
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