多级拼装悬臂式挡墙地震响应振动台模型试验

doi:10.13722/j.cnki.jrme.2020.0481

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Abstract Assembled multi-step cantilever retaining wall is one of new types of light retaining structures suitable for high fill earthworks. In order to determine seismic responses of the wallslope system，horizontally shaking table model tests of assembled threestep cantilever retaining walls supporting a fill slope were conducted with geometry，gravity and time similarity ratios of 1∶10，1∶1 and 1∶3.162 respectively. The results show that the acceleration of the wall-slope system has obviously nonlinear amplification effect upwards along the wall. Both static and dynamic earth pressures on the walls are generally distributed in a trimodal model. Except for the highest-step wall，there is reduction effect of the earth pressure at each wall top due to the shielding action of the nearby heel plates inserted in the filling soil. Distribution of the dynamic earth pressure is commonly multi-segment polyline. At the moment of the peak acceleration of input seismic waves，wall displacements are sharply rising and almost close to their permanent values. During the process of strong seismic action，deformation development of the wall-slope system can be divided into 3 stages including slight deformation of each wall under PGA≤0.4 g，visibly horizontal movement of the lowest-step wall under 0.4 g＜PGA＜1 g，as well as seriously high displacements of all walls under PGA≥1 g. Correspondingly，the failure mode of the wall-slope system can be classified as three types covering horizontally sliding failure of the lowest-step wall along its bottom，shear-tension failure of the filling soil behind the lower walls，together with overall slide failure of the wall-slope system. Based on the overall failure mode determined by the tests，stability analysis of the wall-slope system was carried out according to the pseudo-static approach. Analysis results of a practical example indicate that the factors of safety under various earthquakes by simplified Bishop method and transfer coefficient method are almost equal to each other and about 3%–13% higher than that obtained by Fellenius method. The difference is increasing with rising PGA.

Key words： soil mechanics assembled multi-step cantilever retaining walls shaking table model test seismic response dynamic earth pressure failure mode factor of safety

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	HE Jiang1
	XIAO Shiguo1
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Cite this article:

HE Jiang1,XIAO Shiguo1,2. Shaking table model test study on seismic responses of assembled multi-step cantilever retaining walls[J]. , 2021, 40(2): 399-409.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0481 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I2/399

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