【摘要】：近年來(lái)我國(guó)發(fā)生了數(shù)次大地震,對(duì)震區(qū)路基支擋結(jié)構(gòu)造成大量破壞,如何確保支擋結(jié)構(gòu)工程的安全已成為工程師們嚴(yán)重?fù)?dān)憂的問(wèn)題。如何減輕地震對(duì)路基支擋結(jié)構(gòu)工程的破壞作用成為當(dāng)前研究的熱點(diǎn)和難點(diǎn)。本文通過(guò)在擋土墻與填土之間設(shè)置一層30cm厚具有減震作用的橡膠或EPS泡沫塑料或泡沫混凝土,來(lái)達(dá)到減輕地震對(duì)路基支擋結(jié)構(gòu)工程的破壞作用的目的。運(yùn)用ABAQUS軟件建立重力式擋墻的數(shù)值分析模型,研究在擋土墻與填土之間設(shè)置不同減震材料后,擋土墻在地震作用下的動(dòng)位移、動(dòng)土壓力以及加速度放大系數(shù),分析比較得出這三種材料中減震效果較好的材料。本文的主要工作和分析結(jié)論如下:(1)分析靜力作用下,擋墻與填土間設(shè)置硬度不同的橡膠材料或EPS泡沫塑料或泡沫混凝土?xí)r重力式擋土墻的墻面水平位移和墻背土壓力,通過(guò)分析比較得出:減震材料為橡膠材料時(shí),擋墻水平位移隨硬度增加而減小,但比不加時(shí)大;土壓力隨硬度增加而增大,但比不加時(shí)小。減震材料為EPS時(shí)擋墻水平位移比不加時(shí)大,土壓力比不加時(shí)小。減震材料為泡沫混凝土?xí)r水平位移和土壓力都比不加時(shí)大。(2)分析地震加速度分別為O.1g、0.2g、0.3g、0.4g時(shí),擋墻與填土間設(shè)置硬度不同的橡膠材料、EPS泡沫塑料或泡沫混凝土?xí)r重力式擋土墻的動(dòng)位移、動(dòng)土壓力和加速度放大系數(shù),通過(guò)分析比較得出:O.1g時(shí),EPS泡沫塑料減震效果較好,但是減震效果不明顯,再考慮材料制作與經(jīng)濟(jì)等方面因素,考慮O.1g時(shí),可不加減震材料;0.2g時(shí),硬度70的橡膠減震效果較好;0.3g時(shí),EPS泡沫塑料減震效果較好;0.4g時(shí),硬度30的橡膠減震效果較好。
[Abstract]:In recent years, there have been several major earthquakes in China, which have caused a lot of damage to subgrade retaining structures in earthquake areas. How to ensure the safety of retaining structures has become a serious concern of engineers. How to reduce the damage caused by earthquake to subgrade retaining structure has become a hot and difficult research topic. In this paper, a layer of rubber or EPS foam or foam concrete with 30cm thickness between the retaining wall and the fill is set up to reduce the damage caused by earthquake to the retaining structure of roadbed. The numerical analysis model of gravity retaining wall is established by using ABAQUS software, and the dynamic displacement, dynamic earth pressure and acceleration magnification factor of retaining wall under earthquake are studied after different damping materials are set up between retaining wall and fill. The results of analysis and comparison show that the three materials have better damping effect. The main work and conclusions of this paper are as follows: (1) under static action, the horizontal displacement and earth pressure of gravity retaining wall with different hardness of rubber material or EPS foam or foam concrete are arranged between retaining wall and fill. The results show that when the damping material is rubber material, the horizontal displacement of the retaining wall decreases with the increase of hardness, but it is larger than that when the material is not added. The earth pressure increases with the increase of hardness, but it is smaller than when it is not added. When the damping material is EPS, the horizontal displacement ratio of retaining wall is larger and the earth pressure ratio is smaller than that of non-adding material. When the damping material is foam concrete, the horizontal displacement and earth pressure are larger than that of non-concrete. (2) when the seismic acceleration is 0.1 g, 0.2 g, 0.3 g, 0.4 g, rubber materials with different hardness are arranged between the retaining wall and the filling soil, and the seismic acceleration is 0.1 g, 0.2 g, 0.3 g, 0.4 g respectively. The dynamic displacement, dynamic earth pressure and acceleration magnification factor of gravity retaining wall with EPS foam or foam concrete are analyzed and compared. The results show that at 0.1 g, EPS foam has better damping effect, but it is not obvious. Considering the factors of material making and economy, and considering 0. 1g, no shock-absorbing material can be added; The damping effect of rubber with hardness of 70 is better at 0.2g, that of EPS foam is better at 0.3g, and that of rubber with hardness of 30 is better at 0.4g.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U417.11

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