Analysis On Force And Deformation Of L-Shaped Retaining Wall Structure

As a new, flexible supporting and retaining structure, L-shaped retaining wall permits relative displacement between the wall shingle and the fill. The overall displacement cannot reach the state of limit equilibrium. Therefore, when we use the Coulomb Theory and the static equilibrium condition to calculate the force on L-shaped retaining wall, the result is considerably different from the real value. However, the earth pressure of L-shaped retaining wall is still calculated, worldwide, based on the active earth pressure of Coulomb, leading to lower estimates. Furthermore, while an anti-slide tie on L-shaped retaining wall can improve its anti-slide performance, there is a lack of research on the effect of anti-slide tie on the structural design of L-shaped retaining wall. In response to the abovementioned issues, this paper conducts an in-depth analysis on the computational methods in regard to the earth pressure of L-shaped retaining wall and on the design optimization of the anti-slide tie. The main research contents and conclusions are as follows:(l)Summarized current theories on computing earth pressure and analyze the computational methods in regard to the earth pressure behind L-shaped retaining wall; mainly applied the Coulomb active earth pressure theory, which is adopted in current design norms, to calculate the earth pressure behind L-shaped retaining wall; employed the ABAQUS numerical analysis software to conduct a modeling calculation on the earth pressure behind L-shaped retaining wall.(2)Conducted a contrastive analysis between the Coulomb theory and the ABAQUS numerical analysis in terms of their calculations of the earth pressure behind L-shaped retaining wall. The results suggest that the numerical method generated bigger values than did the Coulomb active earth pressure method. By analyzing the relationship between the coefficients of earth pressure of these two methods, and by comparing them to current methods for computing earth pressure, it was determined that the computational results from a semi-empirical formula of the coefficient of earth pressure at rest were more approximate to the results obtained by the numerical method. Therefore, it is recommended that the calculation be done when the earth pressure is at rest to measure the earth pressure behind L-shaped retaining wall, and that the results be multiplied by a reduction factor of 0.896 to 0.968.(3)Examined and analyzed current design norms for L-shaped retaining wall, wrote a calculation program for L-shaped retaining wall using VISUAL BASIC 6.0, calculated and analyzed how different positions of the anti-slide tie impacted the section area of L-shaped retaining walls of the same height. The results suggest that, with stability being a precondition, the closer the anti-slide tie-when at the bottom of the L-shaped retaining wall-was to the heel of the wall plate, the smaller the section area, and the more economical.(4)Created a model using ABAQUS numerical analysis software, computed and analyzed the displacement at the top of L-shaped retaining walls of the same height under two sets of variables:a) whether there is an anti-slide tie design to the retaining wall and b) the anti-slide tie is placed in different positions. The results suggest that the displacement at the top of L-shaped retaining wall was smaller when there was an anti-slide tie than when there was no such design. It follows that an anti-slide tie can increase the stability of L-shaped retaining wall, and that the closer it is to the heel of the wall plate, the smaller of displacement at the top of L-shaped retaining wall.