A coupled thermo-mechanical discontinuum model for simulating rock cracking induced by temperature stresses
A coupled thermo-mechanical discontinuum model for simulating rock cracking induced by temperature stresses
复制标题
模拟温度应力引起的岩石开裂的热力不连续体耦合模型
DOI：
10.1016/j.compgeo.2015.03.009
复制
发表时间：
2015-06
影响因子：
5.3
通讯作者：
Li Jian Chun
中科院分区：
文献类型：
--
作者：
Jiao Yu Yong;Zhang Xiu Li;Zhang Huan Qiang;Li Hai Bo;Yang Sheng Qi;Li Jian Chun
温度变化经常在脆性材料（如岩石）中引起热应力，在某些情况下导致开裂和危险事故。本文在非连续变形分析（DDA）方法的框架内，提出了一种模拟温度应力作用下岩石破裂过程的热力耦合非连续模型。首先根据能量守恒原理，分析块体系统内的传热过程，确定温度场的变化，然后应用热弹性理论计算热应力，并与原始应力场耦合，最后用两种失效准则对任意两相邻块体之间的界面进行校核，判断是否发生开裂，最后用有限元方法计算出块体系统的温度场。最后，将所提出的模型应用于基于DDA的失效分析程序中，并进行了数值试验验证，模拟结果与已有的分析和试验结果吻合较好，表明所提出的方法对热裂纹模拟是有效的。
Temperature change often induces thermal stresses in brittle materials, such as rock, causing cracking and hazardous accidents under certain circumstances. Within the framework of the discontinuous deformation analysis (DDA) method, this paper presents a coupled thermo-mechanical discontinuum model for simulating the rock cracking process induced by temperature stresses. Firstly, based on the energy conservation principle, heat transfer process in the block system is analyzed to determine changes in the temperature field; secondly, thermal stresses are calculated and coupled with the original stress field by applying the theory of thermoelasticity; thirdly, the interface between any two adjacent blocks is checked with two failure criteria to determine whether cracking occurs; fourthly, the proposed model is incorporated into a DDA-based program for failure analysis; finally, several numerical experiments are performed for verification, the simulated results agree well with the existing analytical and test results, indicating that the proposed approach is effective for thermal cracking simulation.
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