Comparative analysis of seismic design parameter values for geosynthetic-reinforced soil abutment based on shaking table test
At present,there are standardized technical guidelines for the design and construction of geosynthetic reinforced soil abutments(GRS abutments)under static loads,but for the seismic design methods of GRS abutments,there are only some principles and frameworks.There is no specific parameter value method,which needs to be further improved.Firstly,the methods for calculating the parameters of seismic design of geosynthetic reinforced earth retaining walls in relevant domestic and foreign codes or standards were listed and compared,and the similarities and differences were analyzed qualitatively.Then,combined with the monitoring data of the shaking table scale model test under the 1g gravity field,the applicability of the existing seismic design parameter selection method of reinforced earth retaining wall to GRS abutment was tested and relevant suggestions were put forward through the comparison between the actual measured value and the standard value.The results show that the critical acceleration value for the large deformation of the GRS abutment is at least 0.6g,which is greater than 0.3g-0.4g of the general reinforced soil retaining wall,and that before reaching the critical acceleration(0.6g),the GRS abutment is basically not damaged,and the lateral deformation increment does not exceed 0.5%.Therefore,it is recommended that the seismic design of the GRS abutment should be controlled so that the lateral deformation increment of the abutment does not exceed 0.5%.Under this premise,the value method of the horizontal seismic coefficient in the foreign NCMA,FHWA and AASHTO codes is basically applicable to the GRS abutment,and can be used for the calculation of the overall external stability of the GRS abutment;as for the local stability at the top of the GRS abutment,it is necessary to learn from the concept of domestic highway regulations,and further study and propose a more reasonable method for the value of acceleration amplification factor.The value method of the NCMA code for the dynamic increment of the axial force of the reinforcement is suitable for the GRS abutment,and it is relatively safe in design.The method of the FHWA and AASHTO codes can only be used after being revised.
bridge and culvert engineeringseismic designgeosyntheticsGRS abutmentsshaking table test
万方数据
维普
