花岗岩微观力学性质试验研究

发布时间：2018-06-11 19:53

本文选题：岩石力学 + 微观力学性质　；参考：《岩石力学与工程学报》2017年S2期

【摘要】：为探讨花岗岩的微观力学特性,通过粉晶X射线衍射和光学显微镜的表面观察,获得花岗岩各矿物成分及比例和在显微镜下的表面形貌。然后通过纳米压痕试验,得到荷载位移曲线和残余压痕,定性分析花岗岩各成分的力学特征,对压痕试验结果统计分析获得各成分的弹性模量和硬度。再通过二次均质化方法得到花岗岩的等效弹性模量和泊松比,并与单轴压缩试验测得的弹性模量及已有研究资料的泊松比进行对比。结果表明:花岗岩主要由石英、长石、云母等成分组成,并能通过颜色、形态特征识别;石英结构致密,力学性质良好,长石次之,云母质地很软,有明显的孔隙结构;均质化方法计算的弹性模量与单轴压缩试验值相差较小,泊松比与已有研究资料基本吻合,其对于评价材料的力学性能有着重要的工程实践意义。研究成果有助于更好地了解花岗岩的微观力学特性,并为从微观角度确定岩石宏观力学性质研究提供参考。
[Abstract]:In order to study the micromechanical properties of granite, the composition and proportion of minerals and surface morphology of granites were obtained by X-ray diffraction and optical microscope. Then the load-displacement curve and residual indentation were obtained by nano-indentation test. The mechanical characteristics of each component of granite were qualitatively analyzed. The elastic modulus and hardness of each component were obtained by statistical analysis of indentation test results. The equivalent elastic modulus and Poisson's ratio of granite are obtained by the method of quadratic homogenization, and compared with the elastic modulus measured by uniaxial compression test and the Poisson's ratio which has been studied. The results show that the granite is mainly composed of quartz, feldspar and mica, and can be recognized by color and morphological characteristics, quartz has dense structure, good mechanical properties, feldspar is the second, mica is soft and has obvious pore structure. The difference between the elastic modulus calculated by homogenization method and uniaxial compression test is relatively small, and the Poisson's ratio is basically in agreement with the existing research data, which is of great engineering practical significance for evaluating the mechanical properties of materials. The results of the study are helpful to better understand the microscopic mechanical properties of granite and provide a reference for the determination of macroscopic mechanical properties of rocks from the microscopic point of view.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学和工程国家重点实验室;湖北工业大学土木工程与建筑学院;法国里尔科技大学里尔力学实验室;
【基金】：国家自然科学基金资助项目(51579093,51479193) 中国博士后科学基金资助项目(2013M531773)~~
【分类号】：TU45

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