摘要
探明岩石在循环应力和循环温度作用后的断裂特性对于保障地下洞室压缩空气储能这一“双碳”工程的稳定性具有重要现实意义。提出了循环热力作用岩石I型断裂试验方法并对该试验方法的可行性进行了研究。为研究经循环应力和循环温度作用后的岩石受力变形特性和I型断裂特性,设计了相应的带裂缝岩石试件,并提出了相应的试验步骤;采用COMSOL Multiphysics软件对设计的试件进行升降温和单轴压缩试验模拟,采用相场断裂方法模拟三点弯梁断裂试验,获得相应热力响应和裂缝路径,论证试验方法的适用性与可行性。数值模拟结果表明,所提出的试验方法可获得与理论解误差极小的温度场、应力场和裂缝扩展路径,可只对一个试件进行试验而获得循环热力作用过程中的岩石受力变形特性以及循环后的I型断裂特性。
It’s great significant to explore the fracture characteristics of rocks after cyclic stress and cyclic temperature for ensuring the stability of underground compressed air energy storage,a“double carbon”project.An experimental test method for the mode-I fracture characteristics of rocks after cyclic thermal effects was proposed and the feasibility of the method was studied.In order to study the stress deformation characteristics and mode-I fracture characteristics,the corresponding rock specimens with cracks were designed as well as the corresponding test procedures;COMSOL Multiphysics software was used to simulate increase and decrease temperature and uniaxial compression test and the phase field fracture method was used to simulate the three-point bending beam fracture test to obtain the the corresponding thermal response and crack path.The applicability and feasibility of the test method was demonstrated.Numerical simulation results show that the test method can obtain the temperature field,stress field and crack propagation path with the minimal theoretical errors.The method can test only one specimen to obtain the stress-deformation characteristics during the cyclic thermal-mechanical loads and the mode-I fracture characteristics after cycling.
作者
袁野
周舒威
Yuan Ye;Zhou Shuwei(College of Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《市政技术》
2024年第7期1-6,21,共7页
Journal of Municipal Technology
基金
国家自然科学基金面上项目(52278408)
国家自然科学基金优秀青年科学基金项目(海外)(2021)
中央高校基本科研业务费专项资金(22120240146)。
关键词
循环温度
循环应力
I型断裂
相场法
三点弯梁试验
cyclic temperature
cyclic stress
mode-I fracture
phase field method
three-point bending test
