Research on Parameter Sensitivity of Duncan-Chang E-B Model Based on Spatial Random Field Theory
In earth-rock dam projects,due to the uncertainty of on-site construction compaction and the non-uniformity of material collec-tion in the material field,the mechanical parameters of dam materials have variability in dam body,which leads to the differences between the conventional prediction analysis results of earth-rock dam using deterministic parameters and the actual stress and deformation behaviors of dam body.In this paper,based on the geotechnical test results of dam materials in the built engineering,the spatial random field theory is introduced,and the 3D static analysis of the dam body is carried out by constructing stationary random fields.The influence of the mechani-cal parameters of Duncan-Chang E-B model on the settlements and horizontal displacements of dam body is obtained.The sensitivity of the mechanical parameters of Duncan-Chang E-B model is studied,and the sensitivity ranking conclusion is given.The results show that the parameters Kb,K and φ0 in Duncan-Chang E-B model have great influence on the deformation of dam body,among which the influence of parameter Kb is the most obvious,followed by the influence of parameters n and Rf,while the parameters Δφ and m are less sensitive.This research conclusion can provide reference for the rational deformation prediction of earth-rock dam and the study of dam material characteristics.
earth-rock damspatial random fieldDuncan-Chang E-B modelparameter sensitivity
万方数据
维普
