| 高经纬,马国伟,范立峰*.冷却方式对高温状态花岗岩裂隙分布特点的影响[J].实验力学,2019,34(3):381~387 |
| 冷却方式对高温状态花岗岩裂隙分布特点的影响 |
| Research on the effect of cooling method on crack distribution of high-temperature granite |
| 投稿时间：2017-11-25 修订日期：2018-01-23 |
| DOI：10.7520/1001-4888-17-247 |
| 中文关键词: 高温状态花岗岩 冷却方式 CT扫描技术 细观裂隙 非均匀性 各向异性 |
| 英文关键词:high-temperature granite cooling methde Computed tomography(CT) technique mesoscopic cracks heterogeneity anisotropy |
| 基金项目:国家自然科学基金项目(11572282， 51778021)和国家自然科学基金重大科研仪器项目(51627812)资助 |
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| 中文摘要: |
| 火灾后地铁隧道围岩发生破坏，特别是在消防射水冷却后其性能劣化更为显著。为了深入研究冷却方式对高温状态岩石裂隙分布特点的影响，本文首先将花岗岩试样加热至800℃，并分别采用自然冷却和水冷却两种方式降温，然后采用CT (Computed Tomography Technique，计算机层析扫描技术) 观察岩石内部裂隙的分布,并对裂隙进行重构，接着结合经纬分析法确定最优经纬线划分密度，最后研究冷却方式对岩石内部裂隙分布的非均匀性和各向异性的影响。结果表明：(1)网格间距为0.922mm时，试验结果不再随着网格间距的减小而变化；(2)花岗岩800℃时水冷却后,在经向和纬向上的裂隙分布比自然冷却后在经向和纬向上的裂隙分布更趋近于均匀性；(3)花岗岩800℃时水冷却后的裂隙分布比自然冷却后的裂隙分布更趋近于各向同性。 |
| 英文摘要: |
| After the fire, surrounding rock of subway tunnel is destroyed. Especially after the fire fighting water cooling, its performance deterioration is more obvious. In order to study the effect of cooling method on crack distribution of high temperature granite, the granite specimens were heated to 800℃ first, and then cooled by natural cooling and water cooling, respectively. Then the crack distribution in rock was observed by Computed Tomography (CT) technique and reconstructed. In succession, the optimum density of meridional and weft division was determined by means of longitude and weft analysis. Finally, the effect of cooling method on the heterogeneity and anisotropy of crack distribution was studied. Results demonstrate that (1) when the grid spacing is 0.922mm, experimental results no longer vary with the decrease of grid spacing. (2) Crack distribution in specimen along latitude and longitude direction after water cooling is more homogeneous than that after natural cooling. (3) Crack distribution in specimen after water cooling is more isotropic than that after natural cooling. |
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