岩石破裂过程TMD耦合数值模型研究

Study on coupled thermal-mechanical-damage model in rock failure process

从岩石的细观结构层次出发,应用损伤力学和热弹性理论,对热力耦合作用下岩石破裂过程中热-应力-损伤相互作用关系进行了分析。初步建立了细观热-应力-损伤(TMDmodel,thermal-mechanical-damage)耦合数值模型,并在岩石破裂过程分析系统RFPA2D中加实现。运用该数值模型计算模拟均匀与非均匀材料试样在热力耦合作用下的应力分布及破坏形态,通过与理论及试验结果对比,证明了该数值模型的合理性和有效性。

Based on the heterogeneous characteristics of rock at mesoscopic level, the thermal-stress-damage coupled action during the failure process of rock subjected to thermal stress is described with elastic damage mechanics and thermal-elastic theory. A mesoscopic thermal-mechanical-damage coupling model, implemented in rock failure process system, RFPA^2D, is proposed. The RFPA^2D is used to simulate the stress distribution and failure patterns in homogeneous and heterogeneous specimen subjected to thermal loading. The numerical results coincide well with the corresponding mathematic resolution and experimental results; so it is proved that the proposed model as well as the numerical system （RFPA^2D） are reasonable and effective in investigating the failure of heterogeneous materials under thermal stress.