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简述了复合单元法的基本原理和算法,该方法的主要优点在于可以明显地减少前处理的工作量和难度,且可以与有限单元很好地耦合在一个系统中。介绍了宝珠寺重力坝的物理模型超载试验。分别采用三维弹黏塑性复合单元法和三维弹黏塑性有限单元法对宝珠寺重力坝的超载工况进行了数值试验,并与物理试验进行比较。结果表明,三种方法得到的特征点位移吻合得较好,两种数值试验方法的整体位移和应力也基本一致。研究验证了复合单元法的正确性,也说明了该算法的主要优点:前处理简单,计算精度与有限单元法相当,同时还证实了复合单元单元法可以较好地解决复杂岩基上重力坝的变形与破坏问题。
The basic principle and algorithm of composite element method are briefly described. The main advantage of this method is that it can significantly reduce the workload and difficulty of pre-processing and can be well coupled with finite element in one system. The physical model overload test of Baozhusi gravity dam is introduced. The three-dimensional visco-visco-plastic composite element method and the three-dimensional elastic visco-plastic finite element method are respectively used to test the overloading conditions of Baozhusi Gravity Dam and compared with the physical experiment. The results show that the displacements of the characteristic points obtained by the three methods agree well with each other, and the overall displacements and stresses of the two numerical test methods are basically the same. The correctness of the composite element method is verified and the main advantages of the algorithm are also demonstrated. The pretreatment is simple and the calculation accuracy is equal to that of the finite element method. It is also confirmed that the composite element method can solve the problems of the gravity dam Deformation and destruction problems.