基于Hoek-Brown准则的岩体高温-荷载耦合损伤模型及其验证  

Coupling damage model based on Hoek-Brown criterion and its verification for rock mass subjected to high temperature and load

作　　者：姜谙男[1] 黄炫茜 许梦飞 蒋浩鹏 JIANG Annan;HUANG Xuanxi;XU Mengfei;JIANG Haopeng(Institute of Road and Bridge Engineering,Dalian Maritime University,Dalian 116026,Liaoning,China)

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026

出　　处：《沈阳工业大学学报》2024年第4期442-448,共7页Journal of Shenyang University of Technology

基　　金：国家自然科学基金项目(52078093)。

摘　　要：针对隧道岩体在高温和荷载共同作用下产生的耦合损伤问题,基于连续损伤力学理论,引入高温-荷载耦合损伤因子,建立了考虑高温作用的广义Hoek-Brown(H-B)准则的弹塑性损伤本构模型,解决了模型在数值积分过程中的奇异点问题,并利用Fortran语言编写了模型的有限元程序。结果表明:模型计算的应力-应变曲线与试验所得到的曲线趋势一致且计算结果误差在5%以内,温度作用下隧洞围岩损伤逐渐加剧,验证了模型的准确性和程序的稳健性,可为火灾作用下隧道围岩安全稳定性评价提供一种有效计算方法。Aiming at the coupling damage of tunnel rock mass under the joint action of high temperature and load,according to the theory of continuous damage mechanics,an elastoplastic damage constitutive model in accordance with generalized Hoek-Brown(H-B)criterion considering the effect of high temperature was established by introducing the temperature-load coupling damage factor.The problem of singular point in the numerical integration process of the model was solved,and Fortran language was used to compile the numerical algorithm of finite element program.The results show that the trend of the stress-strain curve calculated by the model is consistent with the curve obtained by the test,and the error of the calculated results is within 5%.The damage of tunnel surrounding rock is gradually aggravated under the effect of temperature,confirming the accuracy of the model and the robustness of the program,and it can provide an effective calculation method for the safety and stability evaluation of tunnel surrounding rock suffering fire hazard.

关 键 词：广义Hoek-Brown准则 耦合损伤模型 完全隐式应力返回映射算法 弹塑性模型 高温-荷载耦合 单轴压缩试验 应力-应变曲线 隧洞 

分 类 号：TU443[建筑科学—岩土工程]