Supporting The Optimal Design Of The Retaining Wall Structure

With the fast construction of highway, railway and city in recent years, although there are some design studies for the slope design in these regions, but they aren't very systemic. For the time being, the forms of supporting structure applied in loess and collapsible loess regions are relative single, the slope angle is relative small, and the floor area is big. Moreover, the cost is high, which doesn't conform to the modern design idea that is safe, economic and effective.The many aspects of retaining wall such as its role, form, existing condition of application and research and the trend of development are discussed in this paper. The buttressed retaining wall, in which of retaining structures in earth filling reliability is higher and is also cheaper in the slope of mountain highway, railroad and city, is chosen to carry out optimum design, which aims at making full use of the material strength to the purposes of safe application and the best economic returns. The fist work is to determinate soil pressure acted on the buttressed retaining wall. Because the major load bearing on retaining wall is soil pressure, the Coulomb's theory of soil pressure, which is often used in engineering, is adopted to calculate the magnitude and the action point of soil pressure. Then, the calculating model and the calculating load of each member of the buttressed retaining wall are determined, and we can carry out internal force analysis and can figure out the internal force of structure. Lastly, the total engineering cost of retaining wall is regarded as objective function, the sectional dimensions of wall face plate, toe board, heelboard and stiffener as design variables, thus the mathematical model is established on the basis of constrain conditions including structural design strength, stability of retaining wall and tectonic requirement of design criterion. Complex method is used to optimize the buttressed retaining wall. Compared with the results of common engineering projects, those of the optimum design show that its economical benefits are quite obvious. The optimum idea used in this paper is true of other supporting structure with similar forms.