| 高经纬,席岩,范立峰*,杜修力.热损伤花岗岩内细观裂隙分布非均匀性的研究[J].实验力学,2021,36(3):350~358 |
| 热损伤花岗岩内细观裂隙分布非均匀性的研究 |
| Investigation on heterogeneity of microcracks distribution in thermally damaged granite |
| 投稿时间：2020-08-27 修订日期：2020-12-05 |
| DOI：10.7520/1001-4888-20-174 |
| 中文关键词: 热损伤 花岗岩 细观裂隙 非均匀性 各向异性 |
| 英文关键词:thermal damage granite microcracks heterogeneity anisotropy |
| 基金项目:国家自然科学基金资助项目(51778021)； 北京市杰出青年基金(JQ20039) |
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| 中文摘要: |
| 为认识花岗岩的细观热损伤特性，首先基于CT(Computed Tomography，计算机层析扫描)技术获取高温热处理后花岗岩横截面上的细观裂隙分布图，然后在细观裂隙分布图上选择分析区域并设置参考线，随后计算不同参考线上的细观裂隙密度，并采用细观裂隙密度的变异系数对细观裂隙分布非均匀性进行定量描述，最后讨论变异系数随参考线方向改变的变化规律。结果表明：不同参考线上的细观裂隙密度不同，细观裂隙密度的变异系数大于0，细观裂隙呈现非均匀分布。随着参考线方向改变，细观裂隙密度的变异系数明显改变，变异系数最大值是40%，最小值是25%，热损伤花岗岩横截面上的细观裂隙分布非均匀性呈现各向异性。 |
| 英文摘要: |
| The heterogeneity of microcracks distribution in thermally damaged granite was investigated in the present study. First, the two-dimensional image of microcracks distribution in granite after high temperature treatments was obtained by the Computed Tomography (CT) technology. Then the analysis area was selected on the image of microcracks distribution, and parallel reference lines were set on the analysis area. Subsequently, the microcrack density on each reference line was calculated. Finally, the variation coefficient of microcrack density was used to quantitatively describe the heterogeneity of microcracks distribution, and the change of variation coefficient with the direction of reference lines was discussed. The results showed that the microcrack density on different reference lines was different with each other. The variation coefficient calculated by microcrack densities was greater than 0, which indicated that microcracks had non-uniform distribution. The variation coefficient changed as the direction of reference lines changed, with the maximum value of 40%, and the minimum value of 25%. The heterogeneity of microcracks distribution in thermally damaged granite was anisotropy. |
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