Influence Factors of Mechanical Properties of Geocell Retaining Wall Under Seismic Load

doi:10.12141/j.issn.1000-565X.230412

Abstract

Abstract:

This paper established a numerical model of geotechnical flexible retaining wall supporting slope with FLAC^3D software, and the model was verified by the results of shaking table tests. With the calibrated numerical model, it systematically studied the influence of four factors on the dynamic response of slope, including strip stiffness, cell size, retaining wall thickness and filling elastic modulus. Additionally, it discussed the failure mechanism of the retaining wall and calculated the influence weights of each parameter. The results indicate that the stability of a retaining wall under earthquake action is closely related to these four factors. The distribution law of confining pressure and permanent horizontal displacement along elevation follows a two-stage pattern of “increase-attenuation”. Furthermore, settlement at the top of the slope presents a “V” shape distribution with smaller ends and larger middle portions. The horizontal peak acceleration exhibits a three-stage pattern of “increase-attenuation-increase” along elevation. With the increase of stiffness, the confining pressure of the cell increases, but the permanent horizontal displacement, slope roof settlement and horizontal peak acceleration decrease. With the increase of cell size, cell confining pressure, permanent horizontal displacement, slope top settlement and horizontal peak acceleration increase. With the increase of retaining wall thickness and filling elastic modulus, cell confining pressure, permanent horizontal displacement, slope top settlement and horizontal peak acceleration all decrease. Among the four influencing factors, the influence weight of cell size is the largest, and the influence weight on cell confining pressure is 0.996, while the influence weight of retaining wall thickness is the least. The retaining wall structure of geocele has good seismic performance under earthquake action, and the retaining wall structure has a certain attenuation effect on seismic energy, which can meet the requirements of seismic fortification. The research results provide guidance for the seismic design and engineering application of flexible retaining wall of geocell under earthquake action.

Key words: seismic action, geocell retaining wall, cell parameters, dynamic response, influence weight, failure mechanism

CLC Number:

X703.1

JIN Feifei, SONG Fei, SHI Lei, et al. Influence Factors of Mechanical Properties of Geocell Retaining Wall Under Seismic Load[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(7): 145-160.

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类别	弹性模量/MPa	泊松比	黏聚力/kPa	内摩擦角/（°）	密度/（kg·m^-3）	屈服极限/（kN·m^-1）
砂土	140	0.35	1	38	1 560
砾石	197	0.31	1	52	2 000
格室条带	250					25

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