Study On Deformation Mechanism And Control Method Of High-speed Railway Geogrids-reinforced Earth Retaining Wall

In recent years, Geogrids-reinforced earth retaining wall, a kind of flexible retaining structure which boasts the characteristic of good seismic performance, good practicability, convenient construction and doing no harm to environment, is gaining popularity in high-speed railway embankment construction. The vertical deformation standard during the railway operation is very high, thus it is a key technical problem to make the railway embankment burdened with train loads meet the need of traffic safety and comfort standards. Compared with the traditional railway embankment, its design will face new challenges, so the theoretical calculation and deformation control of geogrids-reinforced earth retaining wall become very crucial.This paper summarizes reinforcement and deformation mechanism at home and abroad, establishes the simplified horizontal and vertical deformation model based on some assumptions and deduces the formula by using mechanical knowledge. It also respectively introduces the horizontal and vertical deformation calculation process when the geogrids-reinforced earth retaining wall was burdened with and without train load, and deduces the vertical deformation calculation process considering the horizontal deformation by using the improved foundation settlement calculation method (splitting summation method).At the same time, based on Qingdao-Rongcheng intercity railway geogrids-reinforced earth retaining wall’s site conditions and design, this paper analyzes retaining wall vertical deformation impact parameters such as reinforced spacing, filling nature, top load, foundation stiffness and lateral deformation by using the nonlinear analysis software ADINA. Some important conclusions are drawn. The results show that rational design of grid, panel, foundation, cushion modulus and thickness can lessen the retaining wall vertical deformation and the uneven settlement effectively.Geogrids-reinforced earth retaining wall deformation calculation and control method have been drawn and they will be very valuable and significant for the deformation characteristics and control study when it was affected by the train load.