Analysis of reinforcement force of reinforced soil retaining wall with composite gabion and geogrid under seismic loading
The composite gabion and geogrid reinforced soil retaining wall(fggrsrw)is a new type of reinforced soil structure with promising application prospects.To investigate the mechanical characteristics of fggrsrw under seismic loading,a 2.0 m test model was constructed based on an actual project by using gabion mesh and geogrid as reinforcement materials,gabion mesh box filled with pebbles as the facing,and standard sand as backfill soil.A large-scale shaking table model test was conducted to elucidate the macroscopic seismic damage phenomena of the structure and the macroscopic deformation patterns of the wall.The mechanical behavior changes such as the tensile force of the reinforcement materials,potential rupture surfaces,and the interface friction coefficient between reinforcement and soil were analyzed.The results indicate that the overall macroscopic deformation of the retaining wall is characterized by a bulge in the middle and upper parts.When the peak acceleration reaches 0.8g,the retaining wall remains stable as a whole,demonstrating desired seismic performance.The peak and permanent displacements of the wall surface are 11.43 mm and 3.40 mm,respectively,both less than 1%of the wall height.The overall deformation pattern of the retaining wall exhibits a coupled translation and rotation mode.The study explored the relationship between the internal damage index(0.56)and the overall stiffness ratio(4 091.70),which are primarily influenced by the reinforcement stiffness and the deformation pattern of the retaining wall.When the gabion mesh and geogrid function together to resist the seismic loading,the tensile force provided by the geogrid is much larger than that provided by gabion mesh,and the tensile force of geogrid accounts for 76%to 92%of the total tensile force of reinforcement.The measured potential failure surface form differs from the existing calculation methods for potential failure surfaces in the specifications.The interface friction coefficient between reinforcement and soil increases with increasing peak acceleration,reaching a maximum value of 0.11,which is much lower than the recommended value in the relevant specifications.The interface friction coefficient of the composite layer reinforcement is slightly lower than that of the single gabion mesh layer.The results can provide data support for the safety design and popularization and application of fggrsrw.
万方数据
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