高速铁路无砟轨道路基沉降监测和研究

摘要

研究目的:高速铁路对路基工程工后沉降控制十分严格,路基工程工后沉降主要为铁路铺轨完成后地基的残余沉降.石家庄—武汉高速铁路设计标准为时速350 km,全线无砟轨道.为研究地基加固措施的科学性,在建设过程中,选取代表性试验工点对复合地基沉降进行监测和研究.研究结论:采用桩+板结构和CFG桩复合地基联合堆载预压措施加固深厚松软土地基,施工期沉降约占最终总沉降的72％～85％,有效地控制了路基工后沉降,整个区段内纵向沉降较为均匀,符合区段路基铺设无砟轨道要求,加固措施有效可行.%Research purposes: High speed railway needs a very strict control of post - construction subgrade settlement.rnThe post - construction subgrade settlemen mainly refers to the residual subgrade settlement after the track is laid. The rndesign speed of the Shijiazhuang - Wuhan high - speed Railway is 350 km/h with the ballastless track. During the rnconstruction, the monitoring and research were done on the subgrade settlement in the tested section in order to research rnthe scientificness of reinforcing subgrade.Research conclusions:The pile + plate structure and CFG pile composite foundation was U6ed for reinforcing the deep rnsoft soil foundation along with the heap pre - loading. The settlement volume during construction was up to the 72% -rn85% of the total settlement volume, so the post - construction settlement was effectively controlled. The vertical rnsettlement of the foundation in the whole section was even and it met the demand of laying the ballstless track and proved rnthe reinforcement measures were feasible.