研究目的:客运专线路基工后沉降控制标准高,目前的地基处理理论与设计方法主要是针对传统的软弱土地基,并不完全适合客运专线路基工后沉降的设计计算与地基加固处理,本文对遇到的若干问题进行分析探讨,提出可采用的方法。
研究结论:通过对确定压缩层厚度各种方法优缺点的分析,给出了压缩层厚度计算方法;在分析轨道、列车以及运架梁车等荷载特点的基础上,通过对路基稳定、沉降变形的控制因素分析,对轨道、列车与运架梁车荷载在稳定、沉降计算中的考虑方式与简化形式提出了建议;通过对各种基础形式的荷载传递特性、复合地基的形成条件等内容的研究,提出客运专线路基沉降控制分析应根据路堤基底垫层形式、加固桩的类型,采用复合地基或复合桩基理论进行。
Research purposes:The commonly-used design and treatment theory andmethod for the traditional softsoil foundations can notmeet the needs of the foundation consolidation treatment and design calculation of the post-construction settlementofpassengerdedicated line because the passengerdedicated line requires less post-construction settlement for its subgrade. This paper offers the solution to control of subgrade settlementofpassenger dedicated line.
Research conclusions:Themethod fordetermining the thickness of compressed layer is put forward throughmaking the analyses ofadvantages and disadvantagesof the allmethods in details. Based on the analysisof the load characteristicsof track, train and transporting girder vehicle and subgrade control factor of stabilization and settlemen,t the proposals are made to simplifying the load forms of track, train and transporting girder vehicle. Through the research on the different load transfer characteristics of foundation forms and formation conditions of composite foundation, it is pointed out the subgrade settlement control on passengerdedicated railway line should be conducted according to the cushion form of the embankmentbase and strengthening pile typeswith the composite foundation theory.
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