Research And Application Of Assembled Retaining Wall For Vehicle Base Filling Slope

Subway construction is usually carried out near existing buildings,and slope cutting is often encountered.In order to minimize the impact caused by subway construction,a retaining wall design and construction technology featuring rapid construction,energy conservation,environmental protection and high quality construction is urgently needed.Therefore,based on the scientific research project of Guangzhou Metro Design and Research Institute Co.,Ltd."Research and Application of Prefabricated Slope Retaining Wall in Vehicle Base",this paper proposes a new type of prefabricated slope retaining wall structure.This paper mainly studies the following contents:1.Study on the structural form and connection mode of components of the assembled retaining wall Through the research on the structure form of the assembled retaining wall and the connection mode of the components,it is determined that the structure form of the assembled retaining wall is longitudinal connection type,and the connection mode of the components is planting bar connection and bolt connection.2.Finite element numerical simulation analysis and practical engineering application verification research Midas GTS NX is used to conduct numerical simulation structural analysis of the new type of prefabricated retaining wall,and the practical engineering application of this type of prefabricated retaining wall in the vehicle base of Guangzhou Metro Line 18 is carried out to verify the stability and reliability of the structure.3.equipment type retaining wall retaining wall structure optimization and standardization.Through the above research,the following conclusions are drawn:1.A new type of prefabricated retaining wall structure with filled soil slope is proposed.According to the different forms of the structure column,it is further divided into four categories: longitudinal connection type,horizontal connection type,through rib type,steel plate combined type assembled retaining wall.The retaining plate of the longitudinal assembled retaining wall is considered as the load-bearing member of the simply supported beam,the column is considered as the load-bearing member of the cantilever beam,and the floor is considered as the load-bearing member of the cantilever plate.2.The connection mode of assembled retaining wall components is analyzed.Planting bar connection and bolt connection are used to connect the longitudinal connected structure.3.Through MIDAS GTS NX,the structural stress characteristics of the longitudinal assembled retaining wall structure were analyzed,and compared with the finite element analysis results of the ordinary cantilever retaining wall structure,the stress characteristics of the longitudinal assembled retaining wall were summarized,and the results of the theoretical analysis of the longitudinal connected structure were verified.4.Compared with the cast-in-place cantilever retaining wall,the prefabricated retaining wall in 4M unit saves 15.9% concrete and 10.3% more steel consumption.The construction technology of prefabricated retaining wall area is summarized.And the site assembly type retaining wall area for a period of three months of construction monitoring,the retaining wall displacement,the distribution of earth pressure behind the wall,reinforcement stress accurate monitoring results.The finite element model of prefabricated retaining wall structure in construction site is established to verify the reliability of monitoring data.5.Optimized the structural size and reinforcement of the longitudinal assembled retaining wall,analyzed the applicable height of the structure,standardized the type of backfill of the wall,and proposed the design size and reinforcement of the components in the range of different wall heights under the action of different loads.In a word,the vertical connected prefabricated retaining wall structure is standardized design.It provides the basis of flexible assembly for the construction site of the assembled retaining wall.The greatest innovation of the prefabricated retaining wall structure mentioned in this paper lies in the flexible assembly on site.However,the research on the connecting nodes is not in-depth enough at present,and further research is needed.