深厚压缩层地基条件下路基沉降控制

研究目的：无砟轨道在客运专线铁路建设中已经成为主要轨道形式,深厚压缩层地基条件下路基沉降控制是无砟轨道客运专线建设中遇到的关键技术难题。迫切需要通过研究确定深厚压缩层地基条件下适合较高路堤无砟轨道铁路技术特点的经济合理、技术可靠的沉降控制方案。研究方法：结合京津城际轨道交通工程试验段路基沉降控制设计,通过技术、经济论证,确定合理的设计方案。研究结果：由于深厚压缩层地基条件下较高路堤高标准沉降控制成本相对较高,常规设计中一般要增加工程成本的支挡结构反而成为节省工程投资的手段。研究结论：在深厚压缩层地基条件下较高路堤高标准沉降控制设计中引入支挡结构,可以在提高沉降控制可靠度的前提下节省沉降控制成本、节约工程用地、美化工程环境。

Control of Subgrade Settlement under Condition of Thick Compressible Foundation

Research purposes:Ballastless track has been the main railway track form of passenger dedicated railway line.Control of subgrade settlement under condition of thick compressible foundation is the key difficult technical problem in construction of passenger dedicated railway line,so it is urgent to do the research on it for the purpose of working out the settlement control program with economic ration and technical reliability,which fits to the features of high embankment ballastless track.Research methods:Based on the subgrade settlement control design of the experimental section of Beijing-Tianjin intercity railway,the rational design program is worked out through making demonstrations in technology and economy.Research results:Because the cost of settlement control for higher embankment of thick compressible subgrade is relatively high,retaining structure which usually increase the engineering cost in common design now become a method to save engineering investment.Research conclusions:To adopt retaining structure in settlement control for higher embankment of thick compressible subgrade can save money,occupy less land and make the construction environment beautiful on the basis of improving the reliability of settlement control.