遂渝线无碴轨道路基施工及沉降观测技术研究

研究目的：总结无碴轨道路基施工及其沉降观测的工艺方法和技术参数，验证软土路基桩网加固结构和红层泥岩改良的合理性，为今后制定类似工程施工的技术标准提供参考。 研究方法：按照四区段八流程、采用冲击碾压加速沉降的方法填筑路基，采用K30、Ev2、Evd检测手段检验路基碾压的密实度。采用埋设沉降板和剖面管方法，长期跟踪观测、记录路基沉降变化的数据，并编写程序预测远降变化的规律。 研究结果：桩网加固段和红层泥岩改良段路基的密实度达到了设计的要求。沉降板观测结果：预测总沉降为小于15mm，6个月沉降小于8mm，均满足工后沉降15mm的标准要求：20m不均匀沉降观测结果为7．89mm，小于20mm／20m的标准要求。研究结论：经高填方桩网路基施工技术和红层泥岩配制石灰拌和料回填碾压路基施工技术做的路基，通过了路基评估验收，满足时速200km无碴轨道的要求。

Research on the Technologies for Construction of Ballastless Track Subgrade of Suining-Chongqing Railway Line and Its Settlement Observation

Research purposes:The purposes are to summarize the technical methods and parameters of construction of ballastless track subgrade and its settlement observation and verify the reasonability of pile-net reinforcement of soft subgrade and improvement of red rock mudstone so as to provide reference to the technical standard for similar work in future.Research methods:The method of impact rolling compaction to accelerate settlement with the four sectors and eight flows was adopted to fill the subgrade,the ways of K30,Ev2 and Evd were adopted to examine the subgrade compactness,the methods of laying settlement plate and section plane tube were adopted to trace and observe the change of subgrade settlement for long term and record the data on settlement volume,and the software was compiled to predict the regularity of settlement change.Research results:The design requirements of compactness were met for the subgrades in pile-net reinforcement section and red rock mudstone improved section.The observation results from settlement plate showed the total predicted settlement volume was less than 15 mm and the settlement volume in six months was less than 8 mm,which met the requirement for post-construction settlement volume of 15 mm.The uneven settlement volume of 20 m was 7.89 mm,which met the requirement of 20 mm/20 m.Research conclusions:The subgrade construction was done by technologies mentioned above passed the evaluation of subgrade and met the requirement of ballastless track of 200 km/h railway.