Particle simulation of thermally-induced rock damage with consideration of temperature-dependent elastic modulus and strength
Particle simulation of thermally-induced rock damage with consideration of temperature-dependent elastic modulus and strength
复制标题
考虑温度相关弹性模量和强度的热致岩石损伤的粒子模拟
DOI：
10.1016/j.compgeo.2013.09.004
复制
发表时间：
2014
影响因子：
5.3
通讯作者：
Hobbs, B. E.
中科院分区：
文献类型：
--
作者：
Xia, Ming;Zhao, Chongbin;Hobbs, B. E.
基于粒子模拟方法，提出了用于模拟热致岩石损伤的热力耦合粒子模型。在该模型中，岩石材料被模拟为颗粒的集合，在模拟机械变形的情况下，颗粒通过它们的键相互连接，而在模拟热传导的情况下，颗粒通过热管相互连接。使用该模型的主要优点是：（1）该模型的微观参数可以直接由相关的宏观参数确定； (2) 以明确的方式考虑与温度相关的弹性模量和强度，从而可以在热力耦合问题中真实地模拟热致岩石损伤。相关应用实例的仿真结果表明：（1）所提出的模型可以产生与实验中观察到的类似的行为； (2) 最终破坏从测试样品的外表面开始并向钻孔传播； (3)可以合理模拟冷却阶段的微观裂纹萌生和扩展过程。
Based on the particle simulation method, a thermo-mechanical coupling particle model is proposed for simulating thermally-induced rock damage. In this model, rock material is simulated as an assembly of particles, which are connected to each other through their bonds, in the case of simulating mechanical deformation, but connected to each other through thermal pipes in the case of simulating heat conduction. The main advantages of using this model are that: (1) microscopic parameters of this model can be directly determined from the related macroscopic ones; (2) the temperature-dependent elastic modulus and strength are considered in an explicit manner, so that thermally-induced rock damage can be realistically simulated in a thermo-mechanical coupling problem. The related simulation results from an application example have demonstrated that: (1) the proposed model can produce similar behaviors to those observed in experiments; (2) the final failure is initiated from the outer surface of the testing sample and propagates toward the borehole; (3) microscopic crack initiation and propagation processes can be reasonably simulated at the cooling stage.
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