The prediction for post-construction settlement of building foundation or roadbed is an important basis for its safety assessment and the determination of maintenance strategy. Therefore

firstly

a methodology of combination prediction is introduced in this paper. By considering the effect of new or old degree of the measured settlement data on the prediction of post-construction settlement

an analytical model is developed by introducing a fresh-degree function

which can reflect the effect of the new or old degree of measured settlement data on prediction. Secondly

using parallel-modification

a method of the adjustment of value interval for combination prediction is proposed through analyzing the variations of the possible combination prediction

to improve the precision of the prediction. And then

on the basis

an improved model for combination prediction of post-construction settlement is established

which can simultaneously describe the effect of new or old degree of the measured data and the effect of adjustment of value interval for combination prediction on settlement prediction. Finally

the proposed method is used to analyze the practical engineering examples

which demonstrates that the method is feasible and reasonable.