岩石初始损伤及其对单轴抗压强度的影响研究

发布时间：2019-04-11 07:28

【摘要】：为获取岩土初始受损程度对岩石力学性质的影响,采用CT扫描技术对软岩(黏土岩)和硬岩(大理岩)的初始受损程度及其对单轴抗压强度的影响进行了研究。软岩受损是通过不同的保护条件使岩石受到损伤,硬岩受损是通过取样方式的不同致使岩样受损。CT扫描试验研究表明混凝土保护条件下受损软岩岩样的CT平均数最高,天然敞露条件下的次之,干湿循环条件下的最低,CT平均数高的对应的岩石单轴抗压强度就越高,CT平均数低的对应岩石单轴抗压强度也越低,受损程度不同的软岩CT平均数呈现一定的规律性。采用无损取样的硬岩岩样初始损伤的程度明显比常规取样的硬岩岩样初始损伤程度低。硬岩岩石的初始受损程度影响其抗压强度,无损取样的大理岩CT数和单轴抗压强度值均高于常规取样的大理岩的CT数和单轴抗压强度值。
[Abstract]:In order to obtain the influence of initial damage degree of rock and soil on the mechanical properties of rock, the initial damage degree of soft rock (clay rock) and hard rock (marble) and its effect on uniaxial compressive strength were studied by CT scanning technique. The damage of soft rock is caused by different protection conditions, while the damage of hard rock is caused by different sampling methods. Ct scan test results show that the average CT of damaged soft rock sample under concrete protection condition is the highest. The rock uniaxial compressive strength corresponding to the high CT mean is higher and the corresponding rock uniaxial compressive strength is lower when the CT average is lower than that under the natural exposed condition, and the lowest under the dry-wet cycle, the higher the rock uniaxial compressive strength is, the higher the rock uniaxial compressive strength is. The average CT of soft rock with different damage degree shows a certain regularity. The initial damage degree of the hard rock sample with non-destructive sampling is obviously lower than that of the conventional sampling hard rock sample. The initial damage degree of hard rock affects its compressive strength. The CT number and uniaxial compressive strength of non-destructive sampling marble are higher than those of conventional sampling marble CT number and uniaxial compressive strength.
【作者单位】：中国地质大学工程学院;长江科学院水利部岩土力学与工程重点实验室;长江科学院服务中心;
【基金】：国家自然科学基金项目(51209020,51379022) 国家重点基础研究发展计划973项目(2011CB710603)
【分类号】：TU452

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