佛开高速公路软基路堤拓宽沉降控制标准研究

以在建的佛开高速公路拓宽工程为背景,分析在拓宽路基边载的作用下,新老路基的沉降变形规律.在此分析的基础上,根据新老路基路面结构路用性能以及变形稳定的要求,并结合现场观测资料,对软基上高速公路拓宽工程的沉降控制标准进行了研究.研究表明,对于拓宽工程软基应采用“三指标”的控制标准,即:拓宽路基施工期老路容许的横坡度变化率、新老路基工后容许横坡度变化率、拓宽路基的容许工后沉降量.

A Study on Control Criterions of Settlement for Widening of Fo-kai Expressway on Soft Ground

Relying on the widening of Fo-Kai Expressway on soft ground test section,the settlement and deformation rules of new and old embankment are analyzed under the load of widening embankment.On the basis of the rules,according to the road performance and the requirement of deformation and stabi-lity of the new and old embankment,combined with the field observation data,the settlement control criterions of the widening of expressway on soft ground are researched.The studies show that the control criterions of the widening project on soft ground should use "three indexes": the allowed transverse slope change rate of existing road during the widening embankment construction,the allowed transverse slope change rate during the post-construction of the new and old embankment,the allowed post-construction settlement of the widening embankment.