Model Test And Numerical Analysis On Dynamic Response Of Reinforced Soil Retaining Walls With Flexible/Rigid Facings

Reinforced soil retaining walls with flexible/rigid facings is developed from the geogrid reinforced soil retaining walls with wrapped face,and the concrete panel is connected with the flexible retaining wall as a whole by the connection bar reserved in geogrid reinforced soil retaining walls with wrapped face,and its transmission mechanism is more complicated compared with geogrid reinforced soil retaining walls with wrapped face due to the increase of rigid wall surface and prefabricated connection.And this kind of panel form retaining walls has practical engineering applications in China’s railroad projects,making it a hot and difficult problem for current research.In this paper,we compare the dynamic characteristics of reinforced soil retaining walls by shaking table test,and develop the numerical analysis model of reinforced soil retaining walls with flexible/rigid facings based on shaking table test and theoretical calculation to investigate its dynamic characteristics.The main works are as follows:(1)According to the similar relationship to the actual project for scaling design,the accelerometer,earth pressure meter,top bar displacement meter and strain gauge used in the test for sensitivity calibration;according to the actual project construction process and construction standards to build the model;determine the input seismic time-history and loading scheme.(2)The shaking table model test of geogrid reinforced soil retaining walls with wrapped face was carried out to describe the seismic phenomena of the test model;the acceleration response at different heights and positions was analyzed;the deformation law at different positions of the retaining wall was tested;the magnitude of horizontal earth pressure and total seismic earth pressure of the retaining wall and the location of their combined action points were studied and compared with the code values;the strain distribution of geogrid was studied.(3)The shaking table model test of reinforced soil retaining walls with flexible/rigid facings was carried out to describe the seismic phenomena of the test model;the acceleration response at different heights and positions was analyzed;the deformation law at different positions of the retaining wall was tested;the magnitude of horizontal earth pressure and total seismic earth pressure of the retaining wall and the location of their combined action points were studied and compared with the code values;the strain distribution of geogrid was studied.The seismic performance of reinforced soil retaining walls with flexible/rigid facings is analyzed by comparing the dynamic characteristics of geogrid reinforced soil retaining walls with wrapped face with reinforced soil retaining walls with flexible/rigid facings.(4)FLAC3D numerical analysis method is used to study the displacement of flexible panels and the distribution of soil pressure behind rigid panels in reinforced soil retaining walls with flexible/rigid facings.