Study On Stress And Deformation Characteristics Of Retaining Wall On Foamy Light Soil Embankment

With the large-scale development of transportation infrastructure,because of its simple structure,convenient construction and light weight,the buttress retaining wall has been widely used in retaining structures.At present,for the retaining wall with a tall wall and a wall filled with laminar foam lightweight soil,it is common to many factors such as the density of the foamed lightweight soil,the geometry of the ribs,the width of the fascia,and the spacing between the buttresses.The impact,resulting in the retaining wall and deformation mechanism is not yet clear.Therefore,using the combination of indoor model tests,numerical analysis and theoretical analysis,it is important to study the stress and deformation characteristics of the buttress retaining wall on layered foam lightweight soil embankment,and it is of great significance to better grasp its engineering characteristics.The main research results of the paper are as follows:1.This paper relies on a tender section of the Guangfo Expressway Jiangmen section of the Guangfo Expressway,combining the similarity theory of geotechnical engineering and model experiments,with reference to the test procedures used in the highway engineering test procedures and related research,and independently designing large-scale indoor model test systems.2.From the aspects of overload,density of foamed soil,and depth of replacement,the stress and deformation characteristics of the retaining wall with layered foam lightweight soil were analyzed.The earth pressure of retaining wall under layered foam lightweight soil was proposed.The distribution pattern also obtained the change law of the retaining wall displacement under different working conditions.Through the regression analysis,the regression equations of the combined forces of earth pressure on the retaining wall and the positions of the action points were obtained,and the appropriate filling height of the foamed lightweight soil on the back wall was determined;and the influencing factors under comprehensive action were obtained by using the range analysis method.The primary and secondary relationship of the degree of influence on the force and deformation characteristics of retaining walls.3.Based on the indoor model test and the numerical simulation method,a three-dimensional finite element model was established to reveal the variation law of the back wall earth pressure and the retaining wall displacement along the wall under different overload conditions,and compared with the model test results to verify the effectiveness of the finite element model.Sex and rationality,and further studied the impact of elastic modulus,fill cohesion and internal friction angle of the foundation soil on the force and deformation of the retaining wall.The results show that when selecting the actual retaining wall,the fortress retaining wall can adapt to the foundation with lower bearing capacity;changing the influence of the cohesion and internal friction angle of the upper and lower filling layers on the soil pressure distribution of their respective soil layers Large,little impact on other soil layers,and it is recommended that the friction angle of the backfill material should not exceed 25°.4.Based on the existing research results,in light of the existing deficiencies in the existing method for calculating layered soil pressure,considering the factors such as the wall dorsal dip angle,the adhesion between walls and soil,and the friction angle,a layered filling active soil was proposed.The pressure calculation formula,and the formula can be successfully degraded to a single layer of soil pressure calculation formula.Comparing with the existing research results and model test results,the results show that the calculation method in this paper is reasonable and reliable,and that the formula is applicable to the calculation of the earth pressure of clay soil and clay soil under complex conditions.