Study On Active Earth Pressure Of Retaining Wall Considering The Multilayered Backfills

The Coulomb’s theory and Rankine’s theory are based on several given conditions and has some limitations and deficiencies. Most of the research objects of the existing calculation theory are homogeneous backfill and research on the layered backfills is very poor, especially the cohesive layered backfills. Aiming at these deficiencies in the traditional theories, the earth pressure of retaining wall with layered backfills is analyzed in this thesis based on the method of limit equilibrium theory. Specific work as follows:(1) For the deficiencies of the Coulomb’s theory and Rankine’s theory, the improved active earth pressure calculation formula which based on the limit equilibrium theory is proposed, which can be used for the earth pressure of cohesive soil and cohesionless soil. The method can calculate the force of earth pressure, distribution and position of action point, which consider lots of the factors and can be applied to the practical engineering easily. Examples were given to analyze and verify the correctness of the method and the improved method could degenerate into the traditional Rankine and Coulomb formula.(2) The active earth pressure of retaining wall with double cohesive backfill is analyzed based on the method of limit equilibrium theory, which can deduce the force of earth pressure, distribution and position of action point. Compared with the traditional methods, the method proposed in this thesis is correct and reasonable, which can be well applied to the practical engineering and extended to multilayer backfills. And the key influence factors of the angle of slip surface, earth pressure and position of action point are analyzed, which reveals the influence of earth pressure and stability of retaining wall.(3) The active earth pressure, distribution and position of action point under seismic load are deduced in the thesis, and the impact of the seismic load on active earth pressure with double cohesive backfills is analyzed.(4) This method is extended to multilayered backfills condition, considering lots of factors. Based on the Visual Basic language, the active earth pressure calculation program is developed.(5) By using the method of this thesis, the concrete project example is analyzed, which guides to how to check the stability of retaining walls and provides the references for the engineering design.