摘要
研究目的:沉降控制是湿陷性黄土区高速铁路建设中的技术难题。本文以郑西客运专线湿陷性黄土路基试验工程为依托,通过开展沉降变形观测、大型浸水试验、路基沉降预测,对高速铁路技术条件下柱锤冲扩桩地基的沉降变形特性、湿陷性消除效果、沉降控制效果等进行研究,以便为湿陷性黄土区高速铁路建设提供技术储备。研究结论:柱锤冲扩桩处理深度可达20～30 m。本试验场地采用22 m柱锤冲扩桩处理,研究表明,路基填筑完成无需堆载预压,其剩余沉降量便可满足铺设无砟轨道对路基工后沉降的控制要求,处理后地基加固层内的黄土湿陷性已完全消除。因此,在大厚度湿陷性黄土场地,采用柱锤冲扩桩处理是一种合理、有效的沉降控制方法。
Research purposes： Settlement controlling is a key technical problem of high -speed railway construction in collapsible loess regions. The papers rely on collapsible loess subgrade test engineering along Zhengzhou - Xihn high speed railway, by carrying on settlement observations, large water immersion test and foundation settlement forecast, research on settlement characteristics, effects of collapsibility elimination and settlement controlling of foundation with piles thrusted - expanded in column - hammer under high - speed railway technology conditions. It can provide technical reserves in collapsible loess regions along high speed railway. Research conclusions： The maximum treatment depth of piles thrusted - expanded in column - hammer is 20 - 30 m. The result show that, dealed with 22 m piles thrusted - expanded in column - hammer, the roadbed rarely occures settment and the collapsibility of reinforced layer also eliminates. The roadbed don＇t need to preload. Thus, piles thrusted- expanded in column -hammer can obtain the expected results in settlement controlling in large thickness collapsible loess site.
出处
《铁道工程学报》
EI
北大核心
2012年第1期21-25,共5页
Journal of Railway Engineering Society
基金
铁道部科技研究计划项目(2005K001-B-2)
关键词
湿陷性黄土
高速铁路
柱锤冲扩桩地基
沉降控制
collapsible loess
high speed railway
foundation with piles thrusted- expanded in columnhammer
controlling of settlement
