Thermo-mechanical coupled particle model for rock

一种岩石热-力耦合颗粒模型（英文）

A thermo-mechanical coupled particle model for simulation of thermally-induced rock damage based on the particle simulation method was proposed.The simulation results of three verification examples,for which the analytical solutions are available,demonstrate the correctness and usefulness of the thermo-mechanical coupled particle model.This model is applied to simulating an application example with two cases：one is temperature-independent elastic modulus and strength,while the other is temperature-dependent elastic modulus and strength.The related simulation results demonstrate that microscopic crack initiation and propagation process with consideration of temperature-independent and temperature-dependent elastic modulus and strength are different and therefore,the corresponding macroscopic failure patterns of rock are also different.On the contrary,considering the temperature-dependent elastic modulus and strength has no or little effect on the heating conduction behavior.Numerical results,which are obtained by using the proposed model with temperature-dependent elastic modulus and strength,agree well with the experimental results.This also reveals that the rock subjected to heating experiences much more cracking than the rock subjected to cooling.

为了模拟岩石热损伤问题,基于颗粒法提出一个新的热-力耦合颗粒模型。利用3个存在解析解的标准算例验证该模型的正确性和有用性。然后,利用该模型模拟一个考虑2种不同情况的应用例子:一是考虑温度无关的弹性模量和强度,二是考虑温度相关的弹性模量和强度。计算结果表明:考虑温度相关和温度无关弹性模量和强度这两种不同情况时,微裂纹的萌生和扩展过程不同,最后导致所形成的宏观破裂形态不同;相反,考虑温度相关或无关弹性模量和强度对热传导行为影响不大。所提出的模型考虑温度相关弹性模量和强度时,相应的计算结果与试验结果吻合较好;与在冷却条件下相比,岩石在加热条件下能形成更多的微裂纹。