不同冷却方式下高温花岗岩巴西劈裂力学行为及细观破坏机制 English Version
Mechanical behavior and mesoscopic failure mechanism of high-temperature granite under different cooling methods in Brazilian tensile tests
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摘要: 为探究不同冷却方式下高温花岗岩巴西劈裂力学行为及其细观破坏机制,利用ABAQUS软件中的内聚力热-力耦合模型开展了高温花岗岩拉伸力学特性的数值模拟研究。通过深入分析试件内微裂纹随加载的起裂、扩展演化全过程揭示了不同冷却方式下高温花岗岩试件的细观破坏机理,并进一步探讨了晶粒边长和晶粒边界强度对高温花岗岩拉伸力学行为的影响。结果表明:采用内聚力热-力耦合模型不仅解决了矿物晶粒间的温度传递问题,同时能够有效模拟温度和冷却方式的变化对花岗岩力学特性的影响;随晶粒边长的增加,花岗岩抗拉强度不断增大,晶粒边界裂纹占比不断减少而穿晶裂纹占比不断增大,晶粒边界的控制作用在不断减弱;随晶粒边界强度的增加,花岗岩抗拉强度不断增大,晶粒边界裂纹数不断减少,总裂纹和穿晶裂纹数表现为不断减少和先增多后减少两种变化趋势。
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关键词:
- 岩石力学 /
- 高温花岗岩 /
- 冷却方式 /
- 内聚力热-力耦合模型 /
- 破坏机制
Abstract: In order to investigate the Brazilian tensile mechanical behavior of high temperature granite and its mesoscopic failure mechanism under different cooling methods, the numerical simulation of tensile mechanical properties of high temperature granite was carried out by using the cohesive thermo-mechanical coupling model in ABAQUS software. The mesoscopic failure mechanism of high temperature granite specimens under different cooling methods was revealed through in-depth analysis of the initiation, expansion and evolution of microcracks during the loading process. The effects of grain boundary length and grain boundary strength on tensile mechanical behavior of high temperature granite were further discussed. The results showed that the cohesive thermo-mechanical coupling model could not only solve the problem of temperature transfer between mineral grains, but also effectively simulate the effect of temperature and cooling method on the mechanical properties of granite. With the increase of grain edge length, the tensile strength of granite increased, the proportion of grain boundary cracks decreased and the proportion of transgranular cracks increased, and the control effect of grain boundary decreased. With the increase of grain boundary strength, the tensile strength of granite increased, the number of grain boundary cracks decreased, the number of total cracks and transgranular cracks showed two trends of decreasing continuously and increasing first and then decreasing. -
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