南水北调工程倒虹吸结构三维节理元计算模型的建立

Application of 3-D Joint Element to Inverted-Siphons

建立了南水北调工程倒虹吸结构的力学计算模型 .通常 ,在工程实际中大多采用平面的力学模型 ,三维的力学模型由于其复杂性而很少被用于工程实际 .因此 ,为了使模型接近实际情况 ,采用了三维有限元 ,但结构的材料与周围土层的性质相差较大 ,有可能在其接触面上产生错动滑移或开裂 .为防止出现这种情况 ,本文提出采用特殊的接触面单元 ,建立倒虹吸结构与地基相互作用的三维节理元模型 .

It was studied that the interaction of inverted siphon of the Diverting Water From South To North and the foundation. The material character of the inverted siphon is very different from that of the foundation. Therefore, on certain condition the slide or split will happen on the contact face. To reflect the character of contact face, a special joint element should be adopted. Then, a three dimensional joint element model of the interaction was established. Structured programming technique was adopted, and the interaction problem of the structure and foundation was well solved, which supply the sufficient theory base for the safety design of the inverted siphons.