高等级公路软基沉降观测的精度指标及观测规范化问题

在沪宁高速公路沉降观测实践的基础上，探讨适合于公路软基沉降观测的规范化问题。提出堆、等、超载的预压期、路面施工期和运行期沉降观测精度取２～１ｍｍ，相应用二等或三等水准；路堤施工期沉降观测精度取３～２ｍｍ，相应用四等水准。路堤填筑期一般每填筑１～２层或７～１０ｄ观测一次；预压初期每７～１０ｄ观测一次；路面施工期每做一层观测一次。文章对沉降观测的实施提出了具体要求。

Precision Index for Subsidance Observation of Soft Foundation of Expressway and Standardization of observation

On the basis of practice of observation for subsidence of the Shanghai Nanjing Expressway,the standardization suitable to subsidence observation of soft base of the expressway is studied in this paper.It is proposed that in the period of stackload,equlload and overload,and in the construction period and the operation period,the precision of subsidence observation with 2～1mm be used,corresponding to the 3rd class level surrey,and during the enbankment construction period,the precision of subsidence observation with 3～2mm be used,corresponding to the 4th class level survey.In the embankment construction period,one observation should be made every 7～10 days or 1～2 layers filled,and once every 7～10 days in the prepressing period.During the road surface construction period,observation must te done for every layer.The detailed requirement for settlement observation is also proposed in this paper.