【作者】 段忠臣；

【导师】 刘昌清；

【作者基本信息】 西南交通大学 ， 道路与铁道工程， 2011， 硕士

【摘要】 包裹式加筋土挡土墙是以面板、填土、筋材等组成的复合支挡结构。目前在铁路、公路、水运及水利等各类土建工程中已得到广泛的应用。然而,加筋土挡墙的设计理论还不够成熟,尤其是动力特性和抗震设计方面。在相关设计规范中,抗震方面的设计采用拟静力法,来考虑地震力的作用。这对于筋土间在地震作用下的复杂的受力机理、土压力与地震力的组合方式,这种设计计算方法显得尤为简单。本文主要针对包裹式加筋土挡土墙抗震设计中存在的问题展开研究,以广(通)大(理)线某车站包裹式加筋土挡土墙为背景,通过理论分析与振动台模拟试验开展了以下一些研究工作：(1)结合国内外研究现状利用摩擦加筋原理和准粘聚力理论对加筋土挡土墙筋土间的相互作用机理进行了深入的理论分析,对加筋土挡墙的几种破坏模式进行了归纳总结,对加筋土挡土墙外部稳定性和内部稳定性进行了深入分析和总结。(2)以广大线某车站包裹式加筋土挡土墙工点原型为依据,确定振动台试验模型的相似率,进而确定模型尺寸及材料,并进行模型试验的设计。(3)通过对模型安放的加速度计、土压力计和电阻应变片所测试验结果进行整理和分析,得出了加速度放大系数与墙高变化的规律；土压力与墙高的变化规律；不同位置处筋材的受力变化规律,加筋土挡土墙的破坏模式及潜在破裂面的位置。(4)通过对试验模型进行理论计算和试验实测值进行计算(0.15g、0.2g、0.3g、0.4g时),得出按规范进行计算的结果较试验实测值进行计算的要小,规范计算方法偏于不安全。(5)通过两组振动台模型试验对包裹式加筋土挡土墙和普通的加筋土挡土墙在不同地震峰值加速度作用下(0.085g、0.15g、0.2g、0.25g、0.312g、0.4g、0.616g)的受力变形特点进行对比分析,得出了包裹式加筋土挡土墙具有更好的抗震性能。更多还原

【Abstract】 Wrap-styled reinforced earth retaining wall is a composite retaining structure, which is built up with panels, fillings, and reinforced materials. It has been widely used in railways, highways, waterways and water conservation and other civil works currently. However, the design theory of the reinforced earth retaining wall is not mature enough yet, especially in the dynamic characteristics and anti-seismic design. In the relevant design specification, the pseudo-static method is employed to consider the effect of seismic force in the anti-seismic design.This for the reinforced earth’s complex loading mechanism under the seismic action,the combination method of earth pressure and seismic forces, the calculation method of the design is particularly simple. This article mainly aims at studying of the problems exist in the anti-seismic design for the wrap-styled reinforced earth retaining wall. Take the wrap-styled reinforced earth retaining wall in a station of Guangtong-Dali line as the background, and through theoretical analysis and vibration table simulated experiments, I conducted some research work as follows:(1) Combined with research status home and abroad, and use the friction of reinforced principle and quasi-cohesion theory, to make a deep theoretical analysis of the interaction mechanism between the earth of the reinforced earth retaining wall, to make a summary of the several wrecking modes of the reinforced earth retaining walls, and to make a further analysis of the external stability and the internal stability of the reinforced earth retaining walls.(2)According to the wrap-styled reinforced earth retaining wall model in a station of Guangtong-Dali line, and ascertain the similarity rate of vibration table test model, and then confirm the model size and the material, meanwhile, design model tests.(3) By placing the accelerometer, soil resistance and strain gauges on the model, I carried out experiments. And after collecting and analyzing the test results, I obtained: the high acceleration amplification coefficient and the variation of the wall’s height; the earth pressure and changes of wall’s height; the changes of the force the reinforced materials at different locations, the wrecking modes of the reinforced earth retaining walls and the location of potential wrecking surface.(4) For the test models, theoretical calculations and experimental measured values are calculated (0.15g,0.2g,0.3g,0.4g), the obtained results are that the calculations under specification are smaller than the measured value ones, and the standard calculation tends to be unsafe.(5) By performing two groups shaking table tests on wrap-styled reinforced earth retaining wall and ordinary reinforced earth retaining wall under the peak accelerations in different earthquakes (0.085g,0.15g,0.2g,0.25g,0.312g,0.4g, 0.616g), I compared and analyzed the force deformation characteristics of the two kinds of walls, and concluded that the wrap-styled reinforced earth retaining wall has better earthquake resistance.更多还原