基于坝—岩基—水耦合解析的坝肩动力稳定分析

发布时间：2018-10-10 16:11

【摘要】：为了模拟三维状态下坝、岩基、库水的动力相互作用机理,研究提出了基于坝—岩基—水耦合的三维有限元分析方法。通过分析坝—岩基—水耦合动力相互作用理论,给出了坝—库水体的耦合条件、坝—岩基—库水的边界条件以及地震时粘性边界的分析方法。以某拱坝工程为实例,应用耦合三维有限元方法计算了拱坝及滑裂面应力分布,采用有限单元法和刚体极限平衡法,计算了坝肩各处的抗滑稳定安全系数。结果表明:最大拱向应力、梁向应力均出现在下游面,分别为1.43 MPa、1.50 MPa,在材料可承受的范围内。通过有限元法计算得到的拱坝坝肩岩体抗滑稳定安全系数为2.78~3.23,通过刚体极限平衡法计算的抗滑稳定安全系数为2.89~3.43,两者相差很小,说明该计算方法是有效的。研究成果可为拱坝坝肩抗滑稳定分析提供参考。
[Abstract]:In order to simulate the dynamic interaction mechanism of dam, rock foundation and reservoir water in three dimensional state, a three dimensional finite element analysis method based on the coupling of dam, rock foundation and water is proposed. Based on the analysis of dam-rock-water coupling dynamic interaction theory, the coupling conditions of dam-reservoir water, the boundary conditions of dam-rock-base-reservoir water and the analytical method of viscous boundary in earthquake are given. Taking an arch dam project as an example, the stress distribution of arch dam and sliding surface is calculated by using coupling three-dimensional finite element method, and the safety factor of anti-slide stability is calculated by using finite element method and rigid body limit equilibrium method. The results show that the maximum arch stress and beam stress appear in the downstream plane, respectively, with 1. 43 MPa,1.50 MPa, in the acceptable range of the material. The safety coefficient of anti-slide stability of arch dam abutment is 2.78 ~ 3.23, and that of rigid body limit equilibrium is 2.89 ~ 3.43. The difference between the two is very small, which shows that the calculation method is effective. The research results can provide a reference for the stability analysis of arch dam abutment.
【作者单位】：中国水利水电科学研究院结构材料研究所;曼彻斯特大学数学系;大连理工大学工程抗震研究所;
【分类号】：TV223;TV642.4

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