The Analysis On Engineering Properties Of Geogrid-Reinforced Earth High Retaining Wall

The study of performance behavior of geogrids-reinforced earth retaining walls is a practical problem in practice of geotechnical engineering. As a new type of geosynthetics, geogrid has been widely used in various types of reinforced earth works for its high-intensity, toughness, strong friction between soil particles, and so on advantages.Firstly, this article describes geogrid physical, mechanical properties and engineering applications. Then the tensile properties and the action characteristics of soil and reinforcement interface about one-way geogrid, two-way geogrid and four-way geogrid were experimentally researched using a type of comprehensive-geosynthetics-meter. The four-way geogrid emerged in recent years is one of the new types of geogrids with unique node forms and mesh structure. The test results prove that the four-way geogrid has better engineering properties.Secondly, combining with the practical engineering of Zhaotong±500kV converter station geogrid reinforced soil retaining wall the rules of the stress and deformation about reinforcement and soil are discussed and concluded in the process of construction; retaining wall structure, construction disturbance, accidental error and so on probably resulting in deviation of test results were explained; The on-site monitoring results show that the geogrid reinforced soil can improve the stress transfer mechanism, and "membrane effect" deriving from deformation of geogrid makes the base stress value less than the theoretical yh value.Thirdly, this article calculates the working parameters of the reinforced retaining wall by finite element method, and using the measured datum and theoretical calculation values to verify the results of the finite element method, on the comparative analysis of both result datum the measured values and the results of finite element method are in the same variation trend. Then on the basis of previous analysis this paper makes a shear strength reduction factor analysis on the reinforced wall, the calculation result shows that the wall is highly stable, at the same time this paper describes the influence of set-back width, single wall height of whole wall and type of filler on reinforced wall working performance by finite element method, which prove that the lateral displacement of the wall panels decreases with the increase of the set-back width and with the decrease of the single wall height.Finally, on the basis of previous experience and associated with the actual situation at the scene this paper introduces construction methods and precautions about the filler selection and compaction, the geogrid laying, panel construction, waterproofing and drainage measures and so on, and makes a set of summary of geogrid reinforced soil retaining wall construction technology.