本文關(guān)鍵詞： 路橋過渡段 差異沉降 CFG樁復(fù)合地基 數(shù)值計算 動力學(xué)分析　出處：《西南交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,隨著高速鐵路的快速發(fā)展,路橋過渡段差異沉降問題日益凸顯,尤其是位于軟土等特殊地基條件下的高速鐵路工程,且隨著列車車速和列車軸重的不斷提高,對過渡段處的差異沉降要求更為嚴(yán)格,"橋頭跳車"問題已成為影響高速列車行車安全的重要因素之一。鑒于目前的現(xiàn)狀,本文以理論分析和數(shù)值計算為研究手段,系統(tǒng)地分析了軟弱土地段高速鐵路路橋過渡段的沉降規(guī)律并提出了相應(yīng)的地基處理方法。本文首先論述了常見的軟土地基處理方法,分析了各種處理方法的優(yōu)缺點和適用性,比較得出CFG樁復(fù)合地基是更適合于軟土地段高速鐵路路橋過渡段的地基處理方法�；谟邢拊椒ń⒘烁咚勹F路路橋過渡段二維數(shù)值模型,數(shù)值計算得出了路橋過渡段路基面沿縱向的沉降規(guī)律,并分析了過渡段材料參數(shù)變化對路基面沉降的影響。在此基礎(chǔ)上,提出了幾種基于CFG樁復(fù)合地基的過渡段地基處理方法,對比分析了各方案對過渡段差異沉降的過渡效果,對CFG樁復(fù)合地基處理高速鐵路路橋過渡段軟弱地基給出了優(yōu)化建議�；谖闹刑岢龅囊环NCFG樁復(fù)合地基處理方案,建立了高速鐵路路橋過渡段軌道-路基-CFG樁復(fù)合地基三維有限元動力模型,分析得出了列車激振荷載作用下過渡段處復(fù)合地基的動應(yīng)力分布規(guī)律,以及樁、土豎向加速度沿路基橫向及深度方向的衰減特征。本文所得結(jié)論可豐富高速鐵路路橋過渡段地基加固技術(shù),對軟土地段的過渡段地基處理具有借鑒意義,為類似工程的設(shè)計提供了參考。
[Abstract]:In recent years, with the rapid development of high-speed railway, the problem of differential settlement in the transition section of road and bridge has become increasingly prominent, especially in the high-speed railway project under special foundation conditions, such as soft soil, and with the increasing of train speed and axle load. The requirement of differential settlement at the transition section is more stringent, and the problem of "bridge-head jumping" has become one of the important factors affecting the safety of high-speed trains. In view of the present situation, this paper takes theoretical analysis and numerical calculation as the research means. This paper systematically analyzes the settlement law of the highway and bridge transitional section of high speed railway in soft soil section and puts forward the corresponding foundation treatment methods. Firstly, this paper discusses the common soft soil foundation treatment methods, and analyzes the advantages and disadvantages and applicability of various treatment methods. It is concluded that CFG pile composite foundation is a more suitable foundation treatment method for highway and bridge transition section of high speed railway in soft soil area. Based on finite element method, a two dimensional numerical model of highway bridge transition section of high speed railway is established. The settlement law along the longitudinal surface of the road and bridge transition section is obtained by numerical calculation, and the influence of the material parameters of the transition section on the settlement of the subgrade surface is analyzed. On this basis, several methods for treating the foundation of the transition section based on the CFG pile composite foundation are put forward. The effect of each scheme on the differential settlement of the transition section is compared and analyzed, and the optimization suggestions for the treatment of soft foundation in the transition section of high speed railway road and bridge by CFG pile composite foundation are given. Based on a CFG pile composite foundation treatment scheme proposed in this paper, Three dimensional finite element dynamic model of the composite foundation of track subgrade CFG pile in the transition section of highway and bridge of high speed railway is established. The dynamic stress distribution law of the composite foundation in the transition section under the action of train excitation and the pile are obtained. The attenuation characteristics of soil vertical acceleration along the lateral and depth direction of the road foundation. The conclusions obtained in this paper can enrich the foundation reinforcement technology of the transition section of the highway and bridge of the high-speed railway, and can be used for reference for the foundation treatment of the transition section in the soft soil section. It provides a reference for the design of similar engineering.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U213.1;U445.55

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