基于ADINA的北盘江水电站地下厂房开挖数值模拟

借助有限元软件ADINA求解模块,分析了北盘江水电站地下主变室开挖过程的围岩稳定性问题。建立了二维硐室数值模型,利用生死单元功能模拟了开挖支护过程,采用摩尔-库伦弹塑性本构模型,计算了开挖过程中位移场、应力场,并分析了其分布规律。将计算结果与现场监测对比,表明数值模型的结果是可靠的。这不仅可为地下工程监测点的选取布置提供参考依据,还可供类似工程参考。

Numerical Simulation on Excavation of Underground Powerhouse in Beipanjiang Hydropower Station Based on ADINA

By the aid of solving module of ADINA finite element software, this paper analyzed the stability of surrounding rock during excavation of underground chamber for main transformer in Beipanjing Hydropower Station; and then established 2D numerical model for the chamber to simulate the excavating and supporting process by the function of element birth and death, and to calculate the displacement and stress fields in the excavation with the distribution laws studied by Mohr-Coulomb elastic-plastic constitutive model. The comparison between the calculation result and the on-site monitoring value demonstrates the result from the numerical model is reliable, which may provide reference not only in selection and arrangement of monitoring points for underground works, but also in similar projects.