Study on Initiative Control of Expressway Differential Settlement Based on Goal

Additional stress in pavement structure caused by differential settlement is analyzed by establishing finite element model.Considering the fatigue behavior of pavement,the goal of differential settlement control is proposed,which is to keep the grade changing rate lower than 0.37%.The differential settlement is graded as four levels,and the possible values of subgrade after the construction are estimated.Corresponding measures are presented to help achieve the goal of initiative control of differential settlement.