【摘要】：軟土地基作為一種特殊的地基形式，常見(jiàn)于我國(guó)沿海地區(qū)。因?yàn)檐浲辆哂袎嚎s性大、含水量高、強(qiáng)度低等特點(diǎn)，所以在軟土地區(qū)建成運(yùn)營(yíng)后的公路時(shí)常出現(xiàn)不均勻沉降、橋頭跳車等現(xiàn)象，給公路的正常運(yùn)營(yíng)帶來(lái)非常大的影響。 橋頭跳車直接原因是由于橋臺(tái)與相鄰路堤之間出現(xiàn)較大沉降差造成的，，其引發(fā)機(jī)理復(fù)雜，故而國(guó)內(nèi)外已有大量相關(guān)研究。目前，人們開始廣泛采用超輕質(zhì)的聚苯乙烯泡沫塑料作為橋頭路堤結(jié)構(gòu)的填料，EPS材料具有其他材料無(wú)法匹及的、良好的緩沖隔振性能。 本文通過(guò)有限元分析軟件，結(jié)合固結(jié)沉降理論及土動(dòng)力學(xué)原理，對(duì)軟土地區(qū)路堤及路橋連接處路堤進(jìn)行模擬分析計(jì)算，并對(duì)軟土地區(qū)EPS路堤的路用性能、路橋連接處EPS輕質(zhì)路堤的隔振效果進(jìn)行研究。研究?jī)?nèi)容主要有以下幾個(gè)方面： 利用固結(jié)沉降理論對(duì)不同路堤高度、不同軟基厚度、EPS材料不同彈性模量、不同密度、不同泊松比等不同參數(shù)的路堤進(jìn)行沉降分析，并對(duì)軟土地基路堤的沉降規(guī)律進(jìn)行總結(jié)。然后，從動(dòng)力學(xué)方面，利用Abaqus有限元軟件，結(jié)合動(dòng)力學(xué)的基本原理，對(duì)EPS材料用于軟土地基路堤的隔振效果進(jìn)行分析，同時(shí)分別與普通路堤進(jìn)行對(duì)比分析，凸顯出EPS材料在施工實(shí)踐方面的優(yōu)越性。除此之外，還對(duì)EPS材料路用性能的影響因素（例如彈性模量、泊松比、密度、鋪筑厚度等）進(jìn)行了分析，為工程中選擇合適的EPS材料提供了有利的依據(jù)；對(duì)工程施工中所關(guān)注的EPS路堤鋪筑長(zhǎng)度進(jìn)行計(jì)算分析，得到了在技術(shù)方面而言的最合理的鋪筑長(zhǎng)度。最后，通過(guò)對(duì)幾種不同軟基處理方法進(jìn)行經(jīng)濟(jì)對(duì)比分析，發(fā)現(xiàn)EPS輕質(zhì)路堤的造價(jià)并未如大家所說(shuō)的過(guò)高，相反，其總造價(jià)及經(jīng)濟(jì)指標(biāo)遠(yuǎn)低于其他的處理方法。通過(guò)一系列的分析計(jì)算，最終得到了一些有意義的結(jié)果，希望在工程實(shí)踐中能得以推廣運(yùn)用。
[Abstract]:As a special kind of foundation, soft soil foundation is common in coastal areas of China. Because the soft soil has the characteristics of large compressibility, high water content and low strength, the uneven settlement of the highway after the completion and operation of the soft soil area and the phenomenon of bridge head jumping bring great influence to the normal operation of the highway. The direct cause of bridge-head jump is due to the large settlement difference between abutment and adjacent embankment, and its initiation mechanism is complex, so there has been a lot of related research at home and abroad. At present, super light polystyrene foam is widely used as filling material of bridge head embankment structure. EPS material has better cushioning and vibration isolation performance than other materials. Through finite element analysis software, combined with consolidation settlement theory and soil dynamics principle, the embankment in soft soil area is simulated and calculated, and the road performance of EPS embankment in soft soil area is analyzed and calculated. The vibration isolation effect of EPS lightweight embankment at the junction of road and bridge is studied. The main research contents are as follows: the settlement analysis of embankment with different embankment height, different soft foundation thickness, different elastic modulus, different density, different Poisson's ratio and other parameters are used to analyze the settlement of embankment with different embankment height, different soft foundation thickness, different density, different Poisson's ratio and so on. The settlement law of soft foundation embankment is summarized. Then, in the aspect of dynamics, the vibration isolation effect of EPS material used in soft foundation embankment is analyzed by using Abaqus finite element software and the basic principle of dynamics. At the same time, it is compared with ordinary embankment. The superiority of EPS material in construction practice is highlighted. In addition, the factors affecting the road performance of EPS materials (such as elastic modulus, Poisson's ratio, density, paving thickness, etc.) are analyzed, which provides a favorable basis for the selection of suitable EPS materials in engineering. Based on the calculation and analysis of the EPS embankment paving length concerned in engineering construction, the most reasonable paving length in terms of technology is obtained. Finally, through the economic comparison and analysis of several different soft foundation treatment methods, it is found that the cost of EPS lightweight embankment is not too high as everyone said, on the contrary, its total cost and economic index are far lower than other treatment methods. Through a series of analysis and calculation, some meaningful results are obtained, and it is hoped that they can be popularized and applied in engineering practice.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.1;U415

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