Testing Study On Seismic Characteristics Of Wrap-Styled Reinforced Earth Retaining Wall

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.