新建铁路软土路基沉降规律研究

Research on Settlement Law of Soft Soil Subgrade of New Railway

研究目的:软土路基由于压缩性高,渗透性低,固结变形持续时间长,所以其沉降规律研究就成为工程设计中的主要问题。为研究软土路基在某一段周期时间内的沉降变形规律,本文对新建胶新铁路软土路基进行2年的详细监测,以此分析软土路基的沉降变形规律。研究结论:路堤土体剖面上差异沉降变形在横向上表现出明显的不均匀性;通车前,路堤不均匀沉降程度随着路堤压缩量的加大而增大;通车1年后,路堤表现为缓慢沉降过程,路堤土体在横向上的不均匀变形程度随之减小,且路堤本体沉降变化很小;土体水平位移引起的工后沉降很小,不足总沉降的9%;磁环高程变化规律表明,路基在工后约6～8个月稳定。

Research purposes： Due to the high compressibility,low permeability and long lasting time of consolidation and deformation of soft soil subgrade,it is important to do the research on the settlement law of the soft soil subgrade in engineering design.To study the settlement law of soft soil subgrade in a certain period of time,the detailed monitoring works were carried out to the soft soil subgrade of new-built Jiaozhou-Xinyi Railway for 2 years for analyzing the settlement and deformation laws of the soft subgrade.Research conclusions：The differential settlement of embankment soil had the obvious unevenness in the lateral direction.Before opening to traffic,the degree of differential settlement of embankment increased with increase of the compression volume.One year later after opening to traffic,the settlement of the embankment became slow and the lateral uneven deformation of embankment soil decreased,but the embankment settlement hardly changed.The post-construction settlement caused by the horizontal displacement of soil was less than 9% of the total settlement.The change law of the magnetic cells elevation showed that the subgrade was in stable status about in 6 to 8 months after implement of construction.