Mechanical Characteristics And Design Method Of Geogrid Reinforced Retaining Wall Based On Dynamic Load

In this paper,"Mechanical Characteristics and Design Method of Geogrid Reinforced Retaining Wall Based on Dynamic Load" as the title.This paper analyzes the effect of the vertical and horizontal ribs in the structure of the reinforced soils,and then carries out the large-scale model failure test of the indoor reinforced retaining wall with three kinds of loading modes such as static load,constant amplitude dynamic load and constant frequency dynamic loading.Combined with the relevant norms of dynamic load under the reinforced retaining wall design methods of finishing and induction.The main research contents are as follows:1.Under the action of different normal loads,six kinds of geogrid with different transverse ribs reduction methods was tested by indoor drawing test,and the effect of geogrid transverse ribs and longitudinal ribs on the drawing action was analyzed.The tensile resistance obtained by the test is in the upper and lower limits of the theoretical shear failure theory and piercing shear failure theory.Through the theoretical calculation of the geogrid surface friction resistance of about 18%-19% of the test pull resistance,and the ratio of the surface friction and the tensile resistance of the tested geogrid is 29%-33%,both of which are A difference of 10%-15%.The bearing capacity of the transverse ribs accounts for 67%-71% of the total drawing resistance,indicating the presence of the transverse ribs,which greatly improves the drawing resistance of the geogrid.2.Under three kinds of ultimate load conditions,the settlement of the loading plate and the horizontal displacement of the retaining wall can be seen that the lower amplitude dynamic load makes the reinforced soil structure more compact to improve the stability of the reinforced earth retaining wall structure by vibration,reinforced retaining wall can withstand greater peak load.However,the larger amplitude of the dynamic load constantly impacted the soil at the top of the wall,making the upper soil continued to spread on both sides,exacerbated the horizontal displacement of the retaining wall,the two complement each other so that the structure of the reinforced retaining wall is increasing,Until the wall completely destroyed damage.3.Among the load factors that affect the additional stress in the soil,the peak load has the greatest effect on the additional stress in the soil,followed by the dynamic load amplitude,the weakest is the dynamic load frequency and the dynamic load balance.The peak value of the load directly affects the additional stress in the soil,and the latter influencing factors change the diffusion and distribution of the overburden load in the soil by increasing the change of the soil structure,thus changing the additional stress in the soil.4.Whether it is dynamic load peak,amplitude,frequency,etc.are by changing the structure of the soil and retaining wall displacement to promote the deformation of the grid in the soil.The entire deformation process of the geogrid is similar to that of the geogrid drawing.The law of deformation depends on the horizontal displacement of the retaining wall,the local settlement of the geogrid and the diffusion of sand and stress.5.With the increase of the overburden load,the weakening effect of the reinforced soil structure on the high frequency load is more obvious.The loading frequency of the overburden load has the greatest effect on the acceleration response in the soil.In addition,not only the dynamic amplitude affects the acceleration response of the tendon structure,but also the minimum value of the dynamic load also affects the acceleration response of the structure.6.According to the relevant norms and literature,combined with the relevant analysis of the second chapter and the third chapter,some suggestions and discussions are made on the design of reinforced earth retaining wall.