Study On Mechanical Characteristics Of High Embankment Gravity Retaining Wall

As an important means for slope support and protection in the field of traffic engineering and geotechnical engineering,the retaining structure plays an important role in the basic construction,especially in the basic construction of mountainous areas.In modern society,science and technology are developing rapidly,and various supporting structures developed according to different geological conditions are more and more abundant,but gravity retaining walls are still the most widely used supporting structure.With the enrichment of relevant research,people have realized that the traditional Coulomb earth pressure theory and Rankine soil pressure theory are quite different from the actual situation under certain conditions,such as when the embankment height is high,and the research on the mechanical properties of the highfilled gravity retaining wall is rare.Therefore,further study on the mechanical properties of high-filled gravity retaining walls has important practical significance for the design and construction of retaining walls.In this paper,two sets of centrifuge tests were designed according to the limitation of the standard,and the distribution of the soil pressure behind the wall of the high-filled gravity retaining wall and the retaining wall were designed by using the finite element software.The displacement pattern has been studied.The main work completed and the main conclusions obtained are as follows:1.Through the geotechnical centrifuge test,the earth pressure behind the wall and the displacement of the retaining wall were measured.It was found that the earth pressure distribution behind the wall showed a “b” type distribution instead of the linear distribution of the classical Coulomb earth pressure theory.2.The results of geotechnical centrifuge test and numerical analysis show that the reinforcement of the backfill of the retaining wall will affect the earth pressure distribution behind the wall.The reinforcement inside the fill can greatly reduce the earth pressure behind the wall.3.Convert the fill above the top surface of the retaining wall to the load corresponding to the fill geometry.And the combined force of the earth pressure measured without reinforcement and the combined force of the earth pressure calculated according to the classical Coulomb soil pressure theory is relatively close,but the combined effect of the two is different.4.Reinforced materials can significantly improve the overall stability of the backfill of the wall.The specific performance is as follows: in the centrifuge test,the backfill of the wall only shows the phenomenon of surface soil slip on the slope of the slope,and the slip surface of the soil surface does not appear to extend from the wall toe.5.The numerical analysis shows that with the increase of the filling height above the retaining wall,the curve characteristics of the earth pressure distribution of the retaining wall are more and more obvious.6.The numerical simulation shows that the critical height of the soil pressure linear distribution and curve distribution of the filling gravity retaining wall is about 8~10m.When it is less than the critical height,it is approximately a straight line distribution,and when it is higher than the critical height,it is a curve distribution.