本文關(guān)鍵詞：地基液化區(qū)域橋梁抗震性能研究及數(shù)值分析　出處：《長安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 液化場(chǎng)地 樁基震害 振動(dòng)臺(tái)試驗(yàn) 樁-土相互作用 有限差分法

【摘要】：震害調(diào)查結(jié)果表明，場(chǎng)地液化導(dǎo)致的地面變形是引起樁基震害的重要原因。研究可液化場(chǎng)地中樁基礎(chǔ)的破壞機(jī)理和規(guī)律對(duì)預(yù)防和減輕地震液化給橋梁帶來的危害具有重要意義。本文基于有限差分法程序FLAC3D建立數(shù)值模型，研究了不同條件下，在地震的作用下的土體和樁基的動(dòng)力響應(yīng)規(guī)律。本文的主要研究工作如下： 1.基于FLAC3D程序（有限差分法），以PL-Finn模型來模擬飽和砂土在動(dòng)力作用下的特性，實(shí)體單元模擬土體，pileSEL單元模擬樁基，，建立可液化場(chǎng)地樁-土-結(jié)構(gòu)動(dòng)力相互作用有限差分三維數(shù)值模型。通過模型體系的動(dòng)力特性的分析以及與振動(dòng)臺(tái)試驗(yàn)的對(duì)比，驗(yàn)證數(shù)值模型的正確性和可靠性； 2.利用FLAC3D進(jìn)行單樁的分析計(jì)算，得出了樁在可液化地基中的反應(yīng)規(guī)律：樁基內(nèi)力在液化土層的交界處最大；探討了上覆非液化土層、覆蓋層密實(shí)度、上部結(jié)構(gòu)的重量以及樁底的支承形式等因素對(duì)樁在動(dòng)力作用下響應(yīng)的影響。計(jì)算分析結(jié)果表明，覆蓋層減弱了樁結(jié)構(gòu)的地震響應(yīng)，上部結(jié)構(gòu)的重量和樁底的支承形式分別對(duì)樁的上部、下部響應(yīng)影響較為顯著； 3.討論了群樁和單樁內(nèi)力分布的不同，以及高樁承臺(tái)和低承臺(tái)形式下樁內(nèi)力分布的規(guī)律； 4.探討了碎石樁和剛性排水樁對(duì)液化場(chǎng)地的影響，及孔壓比沿深度的分布規(guī)律。分析結(jié)果表明，這兩種排水樁能夠顯著提高場(chǎng)地的抗液化性能；討論了在樁徑確定時(shí)，樁間距對(duì)提高其抗液化性能的影響。
[Abstract]:The results of the earthquake disaster investigation show that. Ground deformation caused by site liquefaction is an important cause of earthquake damage of pile foundation. It is of great significance to study the failure mechanism and law of pile foundation in liquefiable site to prevent and reduce the damage to bridge caused by earthquake liquefaction. The numerical model is established based on the finite difference method program FLAC3D. The dynamic response of soil and pile foundation under different conditions is studied. The main work of this paper is as follows: 1. Based on the FLAC3D program (finite difference method), the PL-Finn model is used to simulate the dynamic behavior of saturated sand, and the solid element is used to simulate the soil. The finite difference finite difference numerical model of pile-soil-structure dynamic interaction in liquefiable site is established by pileSEL element simulation. The dynamic characteristics of the model system are analyzed and compared with the shaking table test. Verify the correctness and reliability of the numerical model; 2. Using FLAC3D to analyze and calculate single pile, the response law of pile in liquefiable foundation is obtained: the internal force of pile foundation is the largest at the junction of liquefaction soil; The effects of overlying non-liquefaction soil layer, overburden compactness, weight of superstructure and supporting form of pile bottom on the dynamic response of pile are discussed. The overburden weakens the seismic response of the pile structure, and the weight of the superstructure and the supporting form of the bottom of the pile have a significant effect on the upper part and the lower part of the pile respectively. 3. The difference of internal force distribution between group pile and single pile is discussed, and the law of pile internal force distribution under the form of high pile cap and low pile cap is discussed. 4. The influence of gravel pile and rigid drainage pile on liquefaction site and the distribution of pore pressure ratio along the depth are discussed. The results show that the two drainage piles can improve the liquefaction resistance of the site. The influence of pile spacing on the improvement of liquefaction resistance is discussed when the diameter of pile is determined.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.3

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