Study On Seismic Dynamic Response Analysis Method And Law Of Retaining Wall On Rubber Granular Soil Foundation

With the rapid development of China’s economy,railway and highway mileage increased rapidly.By the end of 2020,China’s total railway mileage,high-speed railway mileage and highway mileage all rank first in the world.At the same time,China is a country with high earthquake frequency.As a lifeline project,the retaining wall on both sides of the railway and highway plays an important role in ensuring the safe operation of the traffic line.Once the damage is done,it will lead to huge economic and human losses.Different from the aboveground structure,the seismic dynamic response of the underground structure is closely related to the seismic displacement of the surrounding soil,rather than the inertia force of the structure itself.Therefore,the interaction between the soil and the underground structure is a necessary factor to consider the seismic resistance of the underground structure.The existing retaining walls seismic dynamic response study mostly adopts the hierarchical method and based on the theory of material department,department of pseudo static method and the pseudo dynamic method,these methods are not considering interaction between retaining wall and soil problems,and the current study when considering soil wall after the assumption of homogeneous soil of soil mostly,seldom consider more common layered soil foundation in practical engineering.Previous studies have shown that layered soil foundation has adverse effects on the seismic dynamic response of structures,and it is very important to study the seismic dynamic response of retaining walls in layered soil foundation for their seismic design.In view of this,the Pasternak two-parameter foundation model was used to simulate layered soil foundation,and the Euler-Bernoulli beam was used to simulate retaining wall to establish the dynamic displacement governing equation of retaining wall in the earthquake-induced lower layer foundation.By introducing the iterative algorithm proposed by Vallabhan,the expression of spring coefficient and shear coefficient of foundation soil in the Pasternak two-parameter foundation model was derived.The lateral displacement of the wall obtained by the method presented in this paper is in good agreement with the results obtained by predecessors,which fully proves the feasibility and correctness of the method presented in this paper.According to the post-earthquake investigation report,the existence of soft soil foundation will have a negative impact on the above-ground and underground structures.However,in actual projects,soft soil is often distributed in the foundation,and its influence on retaining wall has not been explored yet.By designing different thickness,buried depth and modulus ratio of soil layer of soft interlayer behind retaining wall,the influence law of different conditions of soft interlayer on seismic response of retaining wall is further clarified in this paper.After it is clear that the existence of soft interlayer in layered foundation will have a negative effect on the seismic response of retaining wall,how to deal with the problems caused by soft interlayer in foundation is a subject worth studying.In addition,the implementation of a large number of engineering projects and the promulgation of national environmental protection policies,resulting in the growing shortage of sand and gravel raw materials,the development of new lightweight artificial backfill is imminent.Will waste tire and rubber pieces after get the rubber particles of rubber particles mixed with soil and soil mixture has light weight,good effect,low cost and energy consumption as well as good insulation,can be used as the processing of soft ground,also can achieve a good isolation shock absorption effect,at the same time reduce the construction cost,is very important to realize the sustainable development of civil engineering green new material.