Uncertainty analysis of creep deformation of compacted loess considering parameters randomness
The calculated value of existing creep model is a deterministic value,which fails to consider the randomness in the evaluation process of geotechnical materials and parameters.To reflect the random deformation characteristics of geotechnical materials,this paper studied the creep characteristics of compacted loess under graded and separate loading conditions based on repeated 1D compression creep tests.An improved Merchant model considering parameter randomness was established.An uncertainty prediction method for creep deformation was proposed and verified by a high-fill project in Yan'an.The results show that the compacted loess has obvious decaying creep characteristics.The Merchant model with nonlinear elements can better describe the strain-time relationship of the soil.The calculated value of the model considering parameter randomness approximately obeys the normal distribution.The uncertainty prediction method can obtain the probability cloud map of the creep deformation value,and the measured creep deformation value of the project falls within the 95％confidence interval of the predicted range.This shows that the creep deformation uncertainty prediction method considering parameter randomness is effective.
万方数据
维普
