论文部分内容阅读
通过单轴压缩试验和细观损伤特征量化试验,对经历20、100、300、450、600℃五种温度循环后的四川锦屏大理岩试样的宏观力学性质及相应的细观损伤特征进行了研究。试验结果表明:①经历不同温度循环的大理岩单轴压缩破坏试样的细观尺度微裂纹主要由沿晶裂纹、穿晶裂纹及晶内裂纹组成,且裂纹相应的基本几何信息服从广义极限统计分布特征;②由于试样中的沿晶裂纹和穿晶裂纹的100℃温度阈值特征,致使宏观尺度的大理岩试样在温度100℃前后表现出不同力学性质;③沿晶裂纹是在经历温度循环后大理岩试样单轴压缩破坏中起主导作用的微裂纹,穿晶裂纹有一定贡献,而晶内裂纹并未发挥显著作用。
Through the uniaxial compression test and meso-damage characterization test, the macroscopic mechanical properties and the corresponding meso-damage characteristics of the marble samples of Jinping marble in Sichuan Province subjected to five temperature cycles of 20, 100, 300, 450 and 600 ℃ Study. The results show that: (1) The meso-scale microcracks of marble samples subjected to different temperature cycles are mainly composed of intergranular cracks, transgranular cracks and intergranular cracks, and the corresponding basic geometric information of the crack obeys the generalized limit statistics Distribution characteristics; ② Because of the 100 ℃ temperature threshold characteristics of the intergranular crack and transgranular crack in the sample, the macro-scale marble samples show different mechanical properties before and after the temperature of 100 ℃; The microcracks and transgranular cracks, which play a leading role in the uniaxial compression failure of the marble samples after cycling, have a certain contribution, while the intragranular cracks have not played a significant role.