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
Computerized Tomography (CT) was employed to research the effect of initial damage of soft rock (claystone) and hard rock (marble) on the uniaxial compressive strength. Soft rock samples were damaged in deterioration test area condition; while hard rock was damaged by different sampling methods. There were three test conditions natural test area, wet and dry cycle test area and concrete protection test area. CT scanning results show that the average CT number of soft rock sample is the highest under concrete protection test condition, followed by that in natural test and in wet and dry cycle test conditions. Rock samples with high average CT numbers has correspondingly high uniaxial compressive strength, and vise versa. The CT number of soft rock sample presents certain regularity under different damage conditions. The degree of initial damage of hard rock by using non-destructive sampling is significantly lower than that using conventional sampling method. The compressive strength of hard rock is affected by its initial damage degree, and the CT numbers and uniaxial compressive strength of marble by using non-destructive sampling are higher than those by conventional sampling.
关键词
CT扫描试验 /
岩石初始受损 /
CT平均数 /
岩石单轴抗压强度
Key words
CT scanning test /
initial damage of rock /
average CT numbers /
uniaxial compressive strength of rock
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基金
国家重点基础研究发展计划(973)项目(2011CB710603);国家自然科学基金资助项目(51209020);国家自然科学基金面上项目(51379022)
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