Numerical simulation of excavation damaged zone under coupled thermal-mechanical conditions with varying mechanical parameters
Numerical simulation of excavation damaged zone under coupled thermal-mechanical conditions with varying mechanical parameters
复制标题
不同力学参数热力耦合条件下开挖损伤区的数值模拟
DOI：
10.1016/j.ijrmms.2014.11.010
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发表时间：
2015
影响因子：
7.2
通讯作者：
Jeon S.
中科院分区：
文献类型：
--
作者：
Wei C. H.;Zhu W. C.;Yu Q. L.;Xu T.;Jeon S.
了解热-力耦合条件下开挖损伤区的形成及其时空演化规律，对于评价放射性废物地下处置库的长期性能具有重要意义。热应力损伤和岩石参数随温度的变化是热效应影响岩石力学参数的两个主要途径。本文首先建立了基于弹性损伤原理的热力耦合模型。接下来，对该模型进行数值实现，并根据理论解和一些现有的实验观察结果进行验证。最后，数值模拟了花岗岩试样在各种热力条件下的损伤区演化，其中考虑了高温对岩石参数如弹性模量和强度的影响。研究表明，损伤区主要受侧压力系数的控制，温度效应对拉伸损伤起促进作用，对剪切损伤起抑制作用。特别是温度引起的参数变化也是引起岩石损伤的重要途径，而岩石的最终损伤模式取决于高温和外载的联合加载路径。
Understanding of the formation and subsequent spatial and temporal evolution of excavation damaged zone (EDZ) under coupled thermal–mechanical (TM) conditions is of great importance for evaluating the long-term performance of underground radioactive waste repository. Thermal stress induced damage and temperature-dependent rock parameter change are two main ways that thermal effects influence the mechanical parameters of rock under TM conditions. This paper begins with formulation of a coupled thermal–mechanical (TM) model based on elastic damage principle. Next, the model is numerically implemented and validated against theoretical solution and some existing experimental observations. Finally, damage zone evolution in a granite specimen under a variety of thermal and mechanical conditions is numerically simulated, where the influence of elevated temperature on the rock parameters such as elastic modulus and strength is taken into account. It is noted that the damage zone is dominantly controlled by the lateral pressure coefficients, and the thermal effect may promote the tensile damage and restrain the shear damage. In particular, temperature-induced parameter change is also an important way causing rock damage, and the final damage pattern of rock depends on the combined loading path of elevated temperature and external loading.