The Failure Modes And Critical Heights Of Reinforcement Rentaining Wall By Geogrid Space

Geogrid-reinforced soil retaining walls, which are quite capable of resistance to deformation and motion, have been widely used in various fields, such as highway, railway, architectural engineering, hydraulic engineering and so on. But,in the real engineering application,this technique is based on some experients, the theoretical research is behindhand of engineering practice.However, the Theory on the analysis of retaining walls failure mode and the critical height determination is more less.In order to investigate the failure mode and failure mechanism of geogrid-reinforced soil retaining wall under different geogrid reinforcement space and different foundation as well as backfill soil, FLAC^3D based on three-dimensional Lanrangian explicit finite difference method is used for stability analysis of reinforced soil retaining walls. By simulating critical failure states of many cases with different reinforced spaces, the implications to design and construction based on the numerical results of current study are obtained The main work in this paper is followed as:(1) Introduce the development , application and current theory research on reinforced soil retaining wall, and Theoretical methods on critical height determination of reinforced soil retaining structures.( 2 ) Generalize engineering characteristics , reinforcement mechanism and engineering application on geogrid;(3 ) Introduce the basic principle and features of a finite difference program FLAC3D.Compared the response calculated using FLAC^3D program to the observed behaviour, a case for an actual geogrid-reinforced soil retaining wall of one-side facing constructed on a layered soil foundation are investigated to verify the rationality and availability of the proposed numerical model, which is a good test for the following numerical studies on features of wall performance;(4) Four main kinds of modes have been verified. As the mechanisms of the failure modes are researched, reinforcement space is found to be a major influence factor of the failure mode, and it is result in different kinds of failure modes. As reinforcement space increases, the failure mode changes from external failure to compound failure or deep-seated failure and then to internal failure. Numerical simulations confirm that the failure zones develope only in the backfill soil when the retaining wall on the better foundation, while the...