减震材料对挡土墙地震动力响应影响研究

发布时间：2019-03-16 12:44

【摘要】：近年来我国发生了数次大地震,对震区路基支挡结构造成大量破坏,如何确保支挡结构工程的安全已成为工程师们严重担忧的问题。如何减轻地震对路基支挡结构工程的破坏作用成为当前研究的热点和难点。本文通过在挡土墙与填土之间设置一层30cm厚具有减震作用的橡胶或EPS泡沫塑料或泡沫混凝土,来达到减轻地震对路基支挡结构工程的破坏作用的目的。运用ABAQUS软件建立重力式挡墙的数值分析模型,研究在挡土墙与填土之间设置不同减震材料后,挡土墙在地震作用下的动位移、动土压力以及加速度放大系数,分析比较得出这三种材料中减震效果较好的材料。本文的主要工作和分析结论如下:(1)分析静力作用下,挡墙与填土间设置硬度不同的橡胶材料或EPS泡沫塑料或泡沫混凝土时重力式挡土墙的墙面水平位移和墙背土压力,通过分析比较得出:减震材料为橡胶材料时,挡墙水平位移随硬度增加而减小,但比不加时大;土压力随硬度增加而增大,但比不加时小。减震材料为EPS时挡墙水平位移比不加时大,土压力比不加时小。减震材料为泡沫混凝土时水平位移和土压力都比不加时大。(2)分析地震加速度分别为O.1g、0.2g、0.3g、0.4g时,挡墙与填土间设置硬度不同的橡胶材料、EPS泡沫塑料或泡沫混凝土时重力式挡土墙的动位移、动土压力和加速度放大系数,通过分析比较得出:O.1g时,EPS泡沫塑料减震效果较好,但是减震效果不明显,再考虑材料制作与经济等方面因素,考虑O.1g时,可不加减震材料;0.2g时,硬度70的橡胶减震效果较好;0.3g时,EPS泡沫塑料减震效果较好;0.4g时,硬度30的橡胶减震效果较好。
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U417.11

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