Study On Dynamic Characteristics Of Double-deck Driving Structure System Of Steep Slope Under Earthquake

The double-deck traffic structure is a new type of structure suitable for the terrain of the steep slope.The structural system not only conforms to the "resource-saving and environment-friendly" road construction in the country,but also has good static stability Sex.But its research is limited to static aspects.Based on the analysis methods of theoretical analysis,numerical calculation and model experiment,this paper summarizes the current situation of light support structure,anchorage structure,supporting structure and tunnel subway and other soils under dynamic action at home and abroad.Based on the previous research methods of the similar structure,the dynamic analysis of the steep slope near the mountain bike structure system under the horizontal earthquake is carried out.Based on the static study,a 1: 20 scale model shaking table experiment was carried out.ABAQUS finite element numerical simulation was carried out on the experimental model.The experimental results were compared and analyzed.At the same time,the experimental results were shortened.Finally,Based on the results of shaking table experiment and numerical simulation,this paper provides a reference for the practical application of this new type of structural system and provides new ideas and lessons for mountainous highway construction under complex terrain conditions.The main results of this paper are as follows:(1)According to the mechanism of interaction between structure and soil,a model shaking table experimental method and finite element numerical model of the new structure system of steep slope near hill motion under horizontal earthquake are given.And provide reference for dynamic experiment and numerical simulation of special subgrade structure in mountainous area.(2)The whole structure of the structural system is short and the stiffness is large.The dynamic response of the structural system is close,indicating that the stiffness distribution of the structural system is uniform and the overall design is reasonable and has good dynamic stability.(3)Under the action of horizontal earthquake,the bending moment of the anti-slide pile is a "R" shape along the pile,and the distribution rule of "middle big and two small" appears.In the whole process of loading,all the anti-The upper side of the beam and the middle of the bending column bending moment,the beam near the lower side of the anti-slide pile pull,the other end of the upper part of the tension;the upper part of the upper part of the folding sheet,the lower part of the inner pull,and loading The bending moment and the stress value are small in the process.(4)The results of the shaking table experiment and the numerical simulation are close to each other.The acceleration of the model,the change coefficient of the dynamic magnification and the displacement are consistent.The maximum value appears at the top of the anti-slide pile,and the displacement index is kept within 1% during the loading process.Under the action of large earthquakes,the structural system will not be deformed too much.(5)Because of the interaction between the anti-slide pile,the anchor cable and the frame,the dynamic stability of the double-deck driving structure is very good,the overall bearing capacity of the structure is large,and the earth slope has a good supporting effect on the slope.The structural system has good seismic performance.