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我国众多大型地下洞室群位于西南地震频发区,其抗震安全特性值得关注.显式动力有限元时程分析法在实际洞室群工程地震分析中耗时较长,严重制约了该方法的广泛应用.结合显式有限元的积分特点,从有限元积分层面上提出了单、多高斯点分区混合积分方法,以便降低计算量,缩短求解耗时.在计算中,根据计算任务对单元进行积分区域划分,对重点分析的计算区域、边界单元等部位采用八高斯点积分,确保计算精度及人工边界的数值稳定.对其余模型区域采用单高斯点积分,节省计算耗时.采用该方法对某水电站地下厂房洞室围岩进行动力时程计算,速度提高82.4%,取得较好效果.
Many large-scale underground caverns in China are located in the frequent earthquake areas in southwest China, and their seismic safety features deserve attention. Explicit dynamic finite element time-history analysis method takes a long time in the seismic analysis of actual caverns, which seriously hampers the method Which is widely used.According to the integral characteristics of explicit finite element, a single and multi-Gaussian point-partition hybrid integration method is proposed from the point of finite element integration in order to reduce the amount of calculation and shorten the time-consuming solution.In the calculation, The integration of points, the use of eight Gauss points for the calculation of the key analysis of the calculation area, the boundary element and other parts of points to ensure that the calculation accuracy and artificial boundary value of the stability of the rest of the model area using single Gaussian integration points to save the computational time-consuming. The dynamical time history of the surrounding rock of the underground powerhouse of a hydropower station is calculated, increasing speed by 82.4% and achieving good results.