原有路基荷载作用对加宽工程路基沉降变形的影响分析

基于工程实例和数值模拟,分析了高速公路加宽工程中,原有路基荷载作用引起的软基性质改善对路基沉降变形的影响机理。研究表明:新、老路基的沉降变形均受软基性质改善的影响;软基性质改善改变了新路基荷载在老路地基中引起的附加应力分布,这种附加应力的改变也对老路基的沉降产生影响,而传统的计算方法不能考虑附加应力的变化对沉降的影响;对比考虑与不考虑老路基荷载作用的影响,新路基的沉降量会不同,这种沉降差异随路基高度、新路基宽度以及软基厚度的增加而逐渐增大,但老路基的沉降差异只受软基深度的影响。

Analysis of Effects Of oId Embankment's Stability on Expressway Widening Engineering

Based on the engineering case and the numerical modeling,in the expressway widening engineering,the effect mechanism and factors of the soft soil properties improvement induced by the old embankment load on the settlement of the embankment are analyzed.The results show that the settlements of both the new and old embankments are influenced by the soft soil properties improvement,besides,the soft soil properties improvement changes the additional stress distribution in the old road foundation induced by the new embankment load,which also influences the settlement of old embankment.The traditional calculation method can′t consider the effect of the additional stress distribution′s change on the settlement.Comparing considering the effect of the old embankment load and not,the settlements of the new embankment are different,and the settlement difference increases with the increasing of embankment height,new embankment width and soft soil ground thickness,while the settlement difference of old embankment is influenced only by soft soil ground thickness.