地震作用下粘弹性边界边坡模型处理方法
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摘要
针对两侧高度存在差异的岩土边坡问题,采取Plane82标准单元体来模拟岩体边坡,并在所截取矩形区域外围施加粘弹性边界,随后在对称模型的计算条件下,截取地震记录包含峰值在内的前10 s历程,将应力时程作为荷载输入,分析地震波在岩石边坡中的传播。结果显示,针对拥有粘弹性边界的边坡稳定性提出的模型处理方法简单易行且计算结果合理可靠。
For a model with different heights on both sides,applying a viscoelastic boundary to the boundary,rock mass with Plane82 unit was simulated. Under the condition of the symmetric model,seismic records in the bottom boundary and both sides were inputted to simulate the earthquake effect. By analyzing the force-time curve,it was showed that the model is mechanically balanced during motion. Therefore,for the asymmetric slope model,the symmetrical calculation method is more reasonable.
For a model with different heights on both sides,applying a viscoelastic boundary to the boundary,rock mass with Plane82 unit was simulated. Under the condition of the symmetric model,seismic records in the bottom boundary and both sides were inputted to simulate the earthquake effect. By analyzing the force-time curve,it was showed that the model is mechanically balanced during motion. Therefore,for the asymmetric slope model,the symmetrical calculation method is more reasonable.
引文
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[2]DEEKS,ANDREW J,RANDOLPH,et al.Axisymmetric timedomain transmitting boundaries[J].Journal of the Engineering Mechanics Division,1994,1(25):733-739.
[3]杜修力.工程波动理论与方法[M].北京:科学出版社,2009.
[4]黄连娣.高混凝土拱坝的数值模拟及可靠度研究[D].大连:大连理工大学,2011.
[5]谷音.结构—地基动力相互作用问题高效数值方法研究及工程应用[D].北京:清华大学,2005.
[6]蒋新新.复杂地基条件下粘弹性人工边界模型及其应用[D].大连:大连理工大学,2014.