圆形地下连续墙场地地震反应的简化计算方法

首先将水平地震荷载作用沿环向展开为傅立叶级数，利用沿圆周法向和切向两个方向的正交性，再将水平地震荷载转化为一致横向荷载组合，使三维求解问题转变为一系列旋转子午面上二维问题的叠加，进而提出圆形地下连续墙场地地震反应的简化计算方法。之后，采用等效线性化方法来考虑土体非线性性质，进一步将非线性地震反应问题转化为线性问题求解。...

A simplified method for seismic response analysis of site with circular diaphragm wall

First, the horizontal seismic loads were expanded into the Fourier series in the circumferential direction. Considering the orthogonality between the normal and tangential direction on the circumference, the horizontal seismic loads were then transformed into combination of uniform distributed lateral loadings. In this way, the simplified solving method was proposed for the three-dimensional problem reduced to a series of two-dimensional problems. The equivalent linearity method was used to deal with soil nonlinearity, so the nonlinear seismic problem was transformed into linear problem. The practicability and reliability of the simplified method were verified by comparison between the results of simplified model and 3-D model. The results show that the model size is reduced and the computational efficiency is greatly improved by the proposed method. Finally, simplified method was used to analyze the seismic response of foundation site with super large diameter circular diaphragm wall. Compare with the results of the site without wall, the peak acceleration of the pit bottom is increased owing to the confinement effect of wall, and the influence to ground surface far from the wall is very little.