Study on Differential Settlement Characteristics and Control Standards of High Filling Subgrade Widening Project in Soft Soil Area of Chengnan Expressway
Based on Chengnan Expressway widening project and the finite element method,the dif-ferential settlement and its influencing factors of the widening project of high filling subgrade in soft soil area were studied,and the differential settlement control standard for high filling and splicing subgrade in soft soil area of Chengnan Expressway was proposed.The research shows that during the construc-tion period,the old subgrade surface will produce a horizontal deformation towards the two sides and a large uneven settlement,which will easily lead to longitudinal cracks near the center of the old road sur-face;During the operation period,the cumulative settlement of the half-width subgrade surface in dif-ferent operation periods is a spoon-shaped distribution,the maximum settlement appears near the spli-cing of the subgrade,where the subbase is more prone to crack damage,so the splicing area becomes the frequent area of road cracks during the operation period;The filling height,soft foundation thickness and soft soil properties all significantly affect the different settlement of the subgrade surface,while the influence of the new subgrade modulus on the different settlement is not obvious;Considering the com-bination of ultimate tensile stress and fatigue effect of pavement materials,the differential settlement control standard is classified into four grades to guide the engineering design.
soft soilhigh filling subgradesubgrade widening projectdifferential settlementcon-trol standard
万方数据
维普
