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岩体动力本构是研究地下洞室围岩抗震稳定的基础,但目前尚无普遍认可和较成熟的适用于地下洞室围岩地震分析的本构模型。结合已有试验研究成果,基于考虑地震动荷载作用下的岩体强化特性和地震波循环加载情况下的岩体疲劳损伤特性,提出一种适用于地下洞室群抗震分析的岩体弹塑性损伤本构模型,并嵌入到自主开发的显式有限元计算程序,应用于我国西南某大型地下厂房洞室群围岩抗震稳定分析。计算结果表明,设计地震情况下该洞室群围岩基本稳定,但洞室开挖中损伤较严重的区域在地震过程中其损伤程度可能会成倍增加,是抗震支护的重点区域。
The constitutive model of rock mass is the basis for studying the seismic stability of surrounding rock mass in underground caverns. However, there is no universally recognized and mature constitutive model applicable to the seismic analysis of the surrounding rock of underground caverns. Based on the results of previous experimental studies, a rock mass elastoplastic damage model suitable for seismic analysis of underground caverns is proposed based on the rock mass strengthening characteristics and the fatigue damage characteristics of rock mass subjected to cyclic loading under seismic loading. The model is embedded into the self-developed explicit finite element program and applied to the seismic stability analysis of surrounding rock mass of a large underground powerhouse in southwest China. The calculation results show that the surrounding rock mass of this caverns group is basically stable under the design of earthquake conditions, but the degree of damage in the more serious area of excavation of the caverns may be doubled during the earthquake, which is the key area of earthquake-resistant support.