Research on the Nonlinear Algorithm for Lateral Deformation of Foundation under Lightweight Soil Replacement Embankment

Research purposes ： At present，the research on the lateral deformation of the foundation under the lightweight soil embankment still lacks the corresponding theoretical algorithm. Therefore，this paper considers the particularity of the load on the embankment replaced by lightweight soil，and derives the theoretical solution of the lateral displacement of the foundation;Based on the Walsh formula and the assumption of the spherical pores of the soil element，a correction model of the deformation modulus considering the nonlinearity of the soil is proposed，and the nonlinear algorithm for lateral deformation of foundation under lightweight soil replacement embankment is comprehensively constructed. The effectiveness of this algorithm is verified by engineering examples, and the parameter sensitivity analysis is carried out. Research conclusions: (1 ) Through comparison and verification, the calculated value of the theoretical algorithm in this paper is close to the actual measured value, and the overall error between the two is 15. 3% , which is reasonable. (2) Under the load of lightweight soil replacement embankment ' the lateral displacement at the toe of the slope is vertically distributed as a bow curve. ( 3 ) The closer the position to the outer side of the embankment ' the greater the lateral displacement of the foundation*As the Poissons ratio of the foundation increases, the overall lateral displacement of the foundation increases ' and the position of the maximum lateral displacement gradually moves upward*The larger the soil deformation modulus，the smaller the lateral displacement value*The wider the lightweight soil embankment displacement. (4) The research results can provide a theoretical reference for the stability analysis of foam lightweight soil subgrades. © 2023 Editorial Department of Journal of Railway Engineering Society. All rights reserved.