Study on Load Transfer Mechanism of Pile-Supported Embankment Based on Response Surface Method

Based on the improved three-dimensional finite element model, this paper studies load transfer mechanism of pile-supported reinforced embankments. The model uses an elastic medium to replace soft soil subgrade, which reduces calculation depth subgrade and improves efficiency model. validity is proven by field test results theoretical results. By changing cohesion, internal friction angle, modulus embankment filler, geogrid strength, effects various influencing factors pile–soil stress ratio, load-sharing ratio arching effect, membrane effect was analyzed, sensitivity each factor evaluated. response surface optimization test, multiple regression equation evaluation indicators established. interaction between parameters optimal combination solved. show following: Increasing filler can promote a certain extent. However, for embankments, large high will reduce differential settlement ratio; increase in strength has promoting ratio. When reaches 120 kN/m, tends be stable; tested accurately reflect changes relationship values, it fits actual situation well. Numerical simulation that optimized increases 13.4%.