自由場邊界效應(yīng)對港珠澳大橋工程人工島地震反應(yīng)的影響
[Abstract]:Taking the west artificial island of Hongkong-Zhuhai-Macao Bridge as the research object, the influence of the free field boundary effect on the site seismic response is discussed for the free field analysis model. On this basis, using the artificial island numerical model established by Yan Jinru, the effect of free field boundary effect on seismic response of artificial island site is analyzed, and then the horizontal one-way input is compared and analyzed. Three-dimensional nonlinear seismic response of artificial islands under horizontal and three-direction input ground motion. The main work and results are as follows: 1. The effect of free field boundary effect on the dynamic response of free field and artificial island site is analyzed. It is found that when the free field boundary effect is considered, the peak acceleration of free field and artificial island site along the observation line will be larger. The peak acceleration increases gradually along the depth direction, but without considering the free field boundary effect, the peak acceleration of the artificial island site increases first and then decreases along the depth direction, which is inconsistent with the actual situation. After the artificial island is built, the peak acceleration of the artificial island surface is less than the corresponding free site, and its Fourier spectrum is also smaller than the free site, so the reinforcement effect of the artificial island reduces the vibration energy of the site. At the same time, it is found that the soft soil site will filter out most of the high-frequency components and retain only the low-frequency components, and the amplification effect of low-frequency ground motion will be more obvious. The effects of free field boundary effect on the peak displacement and earthquake subsidence of artificial island site under different working conditions are analyzed. It is found that the free field boundary effect has no obvious effect on the horizontal X direction of artificial island site. But it has a great influence on the distribution of Z-direction peak displacement. Considering the boundary effect of free field, the horizontal peak displacement of artificial island site will be larger. The free field boundary effect has great influence on the seismic subsidence distribution of artificial island site. Moreover, considering the boundary effect of free field, the seismic subsidence of the site will be larger. 3. Considering the free field boundary effect, the position of the maximum stress of the pile wall is basically the same as that of the pile wall without considering the free field boundary effect. Both of them appear in the position with large curvature at both ends of the elliptic column of the pile wall, and the free field boundary effect is taken into account. The maximum stress value of the pile wall is larger than that of the pile wall. This effect is especially obvious for the horizontal and bidirectional input. Under three conditions, the free field boundary effect has a great effect on the X-direction peak displacement of pile wall. Considering the free field boundary effect, the displacement of pile wall along the depth direction of pile body is smaller, and the displacement of pile wall along the depth direction of pile body is larger than that of pile wall with the consideration of free field boundary effect. At the same time, it is found that the pile wall has a large deformation along the short axis and is prone to instability, so the slope protection of artificial island should be strengthened to ensure the stability of artificial island.
【學(xué)位授予單位】:北京工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TU311.3;P756.8
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