【摘要】：周期結(jié)構(gòu)對頻率處于衰減域范圍內(nèi)的彈性波的傳播具有抑制作用,因此,基于這一理論提出的周期排樁能作為一種隔離環(huán)境振動的措施�，F(xiàn)有的利用周期理論對排樁結(jié)構(gòu)的研究,主要存在如下局限:一是大多將土體假設為單相均質(zhì)土,未采用多相介質(zhì)模型;二是未考慮排樁結(jié)構(gòu)中初應力的影響。而實際工程中由于存在地下水,土體更加接近飽和土;另外,工程中在樁的貫入、土的再固結(jié)過程中均會產(chǎn)生初應力,因此,有必要考慮初應力的影響。因此,本文將基于周期結(jié)構(gòu)理論和飽和多孔介質(zhì)的Biot理論,研究考慮初應力時飽和土中周期排樁的減振特性。論文主要內(nèi)容包括:1.介紹了周期結(jié)構(gòu)基本理論和飽和土的Biot理論,介紹了計算衰減域的有限單元法。2.首先驗證了利用有限單元法計算飽和土中周期排樁形成的衰減域的正確性,其次在考慮初應力的情況下計算了飽和土中周期排樁形成的衰減域,在此基礎上進一步討論了相關(guān)參數(shù)對衰減域的影響。3.建立了考慮和不考慮初應力的二維頻響分析模型,驗證了利用排樁結(jié)構(gòu)進行環(huán)境減振的可行性,揭示了初應力對頻率響應的影響機理。4.建立了考慮和不考慮初應力的三維頻響分析模型,結(jié)果表明隨著樁長度的增加,衰減域內(nèi)的衰減效果逐漸明顯并且三維模型的計算結(jié)果逐漸收斂于二維模型的計算結(jié)果。此外,當樁長不是特別長時,初應力值可以近似取為樁頂部的應力值。
[Abstract]:The periodic structure can restrain the propagation of elastic wave in the range of frequency attenuation. Therefore, the periodic pile row based on this theory can be used as a measure to isolate the vibration in the environment. The main limitations of the existing research on pile row structure by using periodic theory are as follows: first, most of the soil is assumed as single-phase homogeneous soil without multiphase medium model; second, the influence of initial stress in pile row structure is not considered. Due to the existence of groundwater, the soil is closer to saturated soil in practical engineering, and in addition, the initial stress will be produced in the process of soil reconsolidation in the process of pile penetration, so it is necessary to consider the effect of initial stress. Therefore, based on the periodic structure theory and the Biot theory of saturated porous media, the damping characteristics of periodic piles in saturated soil under initial stress are studied in this paper. The main contents of this paper are as follows: 1. The basic theory of periodic structure and the Biot theory of saturated soil are introduced, and the finite element method for calculating attenuation domain is introduced. 2. Firstly, the validity of the finite element method for calculating the attenuation region of periodic piles in saturated soil is verified. Secondly, the attenuation region of periodic pile row formation in saturated soil is calculated considering the initial stress. On the basis of this, the influence of the related parameters on the attenuation region is further discussed. 3. 3. A two-dimensional frequency response analysis model considering and disregarding the initial stress is established, which verifies the feasibility of using the pile row structure to reduce the ambient vibration, and reveals the mechanism of the influence of the initial stress on the frequency response. 4. A three-dimensional frequency response analysis model with and without initial stress is established. The results show that the attenuation effect in the attenuation domain becomes more and more obvious with the increase of pile length, and the calculated results of the three-dimensional model converge to that of the two-dimensional model. In addition, when the pile length is not very long, the initial stress value can be approximately taken as the stress value at the top of the pile.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU435

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