兵团垦区软土路基工后差异沉降控制标准研究

Research on the Control Standard of the Difference Settlement of the Subgrade on the soft ground after Construction at Xinjiang Corps Region

针对新疆建设兵团垦区软土地区的公路工程特点,运用有限元软件,建立计算模型来研究路基发生不均匀沉降时路面结构的受力特性,从控制路面结构的容许弯拉应力的角度,分析了影响软土地基的工后容许差异沉降量的因素,包括公路等级、路基宽度、交通量、路堤填土高度等;提出了垦区软土地区公路路基顶面的工后差异沉降控制标准的计算思路,并总结了计算流程。在此基础上,通过计算,提出了垦区软土地区二,三,四级公路路基顶面的工后差异沉降控制标准,并根据路基顶面的差异沉降率控制标准,反算出软土地基的工后容许差异沉降量控制标准。

In relation to the characteristics of highway engineering on soft soil in the reclamation area of Xinjiang Production and Construction Crops,this paper established a calculation model with FEM software to study the forces on the pavement structure when differential settlement arose at the subgrade and,from the point of allowable flexural-tensile stress controlling pavement structure,analyze the factors that affect the postconstruction allowable differential settlement of the soft soil subgrade include highway class,subgrade width,traffic volume,and embankment filling height; moreover,suggested the ideas calculating the control criteria of post-construction differential settlement on the top of the highway subgrade in this area with the calculation process generalized.Then depend on this,the paper put forward by calculation such control criteria for the subgrade top of the highways in Class 2,3 ＆ 4 in this area,based on which,by back calculation,obtained the control criteria of post-construction allowable differential settlement for soft soil foundation.