【摘要】：以港珠澳大橋工程西人工島為研究對(duì)象,首先針對(duì)自由場(chǎng)分析模型討論了自由場(chǎng)邊界效應(yīng)對(duì)場(chǎng)地地震反應(yīng)的影響。在此基礎(chǔ)上,采用閆靜茹建立的人工島數(shù)值模型,分析了自由場(chǎng)邊界效應(yīng)對(duì)人工島場(chǎng)地的地震反應(yīng)的影響,進(jìn)而對(duì)比分析了在水平單向輸入、水平雙向輸入和三向輸入地震動(dòng)時(shí),人工島的三維非線性地震反應(yīng)。主要工作和成果如下:1.對(duì)比分析了自由場(chǎng)邊界效應(yīng)對(duì)人工島下臥層自由場(chǎng)及人工島場(chǎng)地的動(dòng)力反應(yīng)的影響,發(fā)現(xiàn)考慮自由場(chǎng)邊界效應(yīng)后,自由場(chǎng)地及人工島場(chǎng)地沿地表觀測(cè)線的峰值加速度會(huì)偏大,沿深度方向峰值加速度呈現(xiàn)逐漸增大的趨勢(shì),而不考慮自由場(chǎng)邊界效應(yīng)時(shí),自由場(chǎng)地基人工島場(chǎng)地沿深度方向峰值加速度出現(xiàn)先增大后減小的現(xiàn)象,這與實(shí)際情況是不相符的。修筑人工島后,人工島地表的峰值加速度小于相應(yīng)的自由場(chǎng)地情況,其傅氏譜值也小于自由場(chǎng)地,因此人工島的加固效應(yīng)使場(chǎng)地的振動(dòng)能量減小了。同時(shí)發(fā)現(xiàn),軟土場(chǎng)地會(huì)過(guò)濾掉大部分高頻成分,僅保留低頻成分,并且對(duì)低頻地震動(dòng)放大效應(yīng)要較為明顯一些。2.對(duì)比分析了不同工況下,自由場(chǎng)邊界效應(yīng)對(duì)人工島場(chǎng)地的峰值位移及震陷的影響,發(fā)現(xiàn)自由場(chǎng)邊界效應(yīng)對(duì)人工島場(chǎng)地水平X向影響不明顯,但對(duì)Z向峰值位移分布規(guī)律影響較大。考慮自由場(chǎng)邊界效應(yīng)時(shí),人工島場(chǎng)地的水平峰值位移會(huì)偏大。自由場(chǎng)邊界效應(yīng)對(duì)人工島場(chǎng)地的震陷分布影響較大。并且,考慮自由場(chǎng)邊界效應(yīng)后場(chǎng)地的震陷量會(huì)偏大。3.考慮自由場(chǎng)邊界效應(yīng)后,樁墻產(chǎn)生最大應(yīng)力的位置與不考慮自由場(chǎng)邊界效應(yīng)時(shí)基本一致,都是出現(xiàn)在樁墻橢圓柱長(zhǎng)軸兩端曲率較大的位置,并且,考慮自由場(chǎng)邊界效應(yīng)后,樁墻的最大應(yīng)力值會(huì)偏大,這種效應(yīng)對(duì)水平雙向輸入時(shí)尤其明顯。三種工況下,自由場(chǎng)邊界效應(yīng)對(duì)樁墻X向峰值位移影響較大。其中,考慮自由場(chǎng)邊界效應(yīng)后,樁墻沿樁身深度方向,X向的位移變化較小;不考慮自由場(chǎng)邊界效應(yīng)時(shí),樁墻沿樁身深度方向,X向的位移變化較大。同時(shí)發(fā)現(xiàn),樁墻沿短軸方向整體變形較大,易失穩(wěn),應(yīng)加強(qiáng)人工島的護(hù)坡設(shè)置,保證人工島的穩(wěn)定性。
[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(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TU311.3;P756.8

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