Shaking Table Test Analysis Of Dynamic Characteristics Of Composite Gabion And Geogrid Reinforced Soil Retaining Wall

In this paper,the existingcomposite gabion and geogrid reinforced soil retaining wall project is taken as the research object,relying on the National Natural Science Foundation Project "Study on the working mechanism of the rigid&flexible composite wall reinforced soil retaining wall under earthquake loading"(51778144).Through the shaking table test of thecomposite gabion and geogrid reinforced soil retaining wall,the dynamic response,seismic earth pressure and potential rupture surface position of the wall are studied under different intensity earthquakes.The research results can provide reference for the seismic design of the reinforced soil retaining wall project.The main work and results are as follows:(1)The similarity relationship of the model tests is determined.The shaking table test model of thecomposite gabion and geogrid reinforced soil retaining wall with similar ratios of 1:5 and 1:2.5 is designed.The panel form,reinforced materials,backfill and sensor layout are determined.The type of input seismic wave and the test loading scheme are selected.The displacement meter,the static earth pressure meter and the dynamic earth pressure meter are calibrated,and the accelerometer is tested for synchronization.(2)The shaking table test of composite gabion and geogrid reinforced soil retaining model wall with different similarities is carried out.And the macroscopic phenomenon of the experimental model under earthquake action is described.The dynamic response of the model wall under earthquake action is studied.The acceleration response and magnification of the backfill are compared with the design acceleration in the specification.At the same time,the such as spectral characteristics of the model,horizontal displacement,corner and residual displacement of the wall,vertical settlement and residual settlement of the backfill,horizontal dynamic earth pressure along wall-back,strain of reinforcement and friction coefficient of the reinforced soil interface are obtained.(3)Five kinds of horizontal static earth pressure calculation methods and ten kinds of seismic earth pressure calculation methods are used.After the data is restored according to the similarity ratio,the distributed of horizontal static earth pressure,vertical static earth pressure and seismic earth pressure distribution along wall-back,the total force and the total force point relative position of the 10 m wall and the 5m wall are compared.And the distribution law of the above aspects is obtained.Simultaneously compare and analyze the difference and the reason between the test value and the theoretical value of the horizontal static earth pressure coefficient.(4)Nine kinds of methods for determining the position of potential rupture surfaces are introduced.The theoretical potential rupture surface position of the wall model is determined and compared with the potential rupture surface position under 1.6g and 2.0g conditions.The position of the strain peak at the top and bottom of the wall is not within the theoretical range,but other values are within the range of the theoretical rupture surface.Provide a reference for the reinforcement design of the reinforced soil retaining wall.