摘要
研究目的:郑西客专沿线黄土分布广泛,其中黄土的60%为易对工程造成严重影响的湿陷性黄土地基,郑西客专为国内外首次在湿陷性黄土地基上修建的无砟轨道高速铁路,有效解决黄土地基的湿陷性和工后沉降是高速铁路路基修建的关键。研究结论:根据郑西客专湿陷性黄土的具体特征,通过理论分析、离心模型试验、现场试验等方法研究了路基桩板结构、水泥土柱锺冲扩桩、水泥土挤密桩和CFG桩处理湿陷性黄土地基的适应性和效果,得出:(1)分幅顶置式路基桩板结构对深层湿陷性黄土地基和桥隧间短路基具有明显的优势;(2)水泥土柱锤冲扩桩适宜于处理浅层和中厚层湿陷性黄土;(3)水泥土挤密桩可用于处理浅层湿陷性黄土,但应充分考虑其适用条件限制;(4)CFG桩处理湿陷性黄土宜采用小直径小间距方案;(5)研究成果可为湿陷性黄土地基加固提供重要参考。
Research purposes： The loess is widely distributed along the Zhengzhou - Xi＇an Passenger Dedicated Line and about 60 percent of the loess is the collapsible loess that has a strong impact on the railway construction. The Zhengzhou- Xi hn Passenger Dedicated Line is the first ballastless high -speed railway built on the collapsible loess foundation at home and broad. How to solve the problems of the collapsibility and post - construction settlement of the loess foundation was the key point in building the collapsible foundation. Research conclusions ： According to the characteristics of the collapsible loess of the Zhengzhou - Xi ＇an Passenger DedicatedLine, by making the theoretical analysis and doing the centrifugal model tests and field tests, the research was done on the adaptability and effect of reinforcing the collapsible loess foundation with the pile - board structure of subgrade, cement soil column hammer impact -expand pile, cement soil compaction pile and CFG pile. From the results it is concluded： （1） The overhead and framing pile -board structure has a distinct advantage to reinforce the deep collapsible loess foundation or short collapsible loess foundation between bridge and tunnel. （2） The cement soil column hammer impact - expand pile is available for reinforcing the medium deep collapsible loess foundation. （3） The cement soil compaction pile is available for reinforcing the shallow collapsible loess foundation according to the limited conditions. （4） The cement -flyash -gravel pile （CFG pile ） is available for reinforcing the collapsible loess foundation with small diameter and distance. （5） The research results can provide the reference to the reinforcement of the collapsible loess foundation.
出处
《铁道工程学报》
EI
北大核心
2013年第9期15-19,共5页
Journal of Railway Engineering Society
关键词
郑西客专
湿陷性黄土
沉降控制
地基处理
Zhengzhou - Xi ran Passenger Dedicated Line
collapsible loess
settlement control
foundationtreatment
