研究目的：<软土地基沉降控制是高速铁路路基工程中的关键技术。本文结合我国高速铁路的发展和建设，选取京沪高速铁路、温福铁路、沪杭客专等不同区域不同成因软土、不同地基处理方法的代表性试验工点，以高速铁路沉降控制为重点，在现场测试试验数据的基础上，对软土不同地基处理方法的地基受力变形特性及沉降控制效果等进行系统的总结和研究。
研究结论：（1）对沉降控制严格的无砟轨道不建议使用排水固结法，但若有足够的放置时间并结合堆载预压也可满足工后沉降的要求；（2）水泥土桩处理深度有限，用于无砟轨道应谨慎，需要结合地区经验并留有足够的放置时间，且一般应结合堆载预压使用；（3）CFG桩、预应力混凝土管桩桩网结构、桩筏结构沉降控制效果较好，沉降稳定时间较短，可用于无砟轨道路基软土地基加固；（4）桩板结构沉降控制效果好，但工程费用高，可用于特殊地段；（5）本研究结论可为高速铁路软土路基地基处理措施选择及沉降控制提供指导作用。
Abstract
Abstract：Research purposes： The settlement control on soft soil foundation is the key technology in the subgrade construction of high-speed railway. Combined with the development and construction of high-speed railway in China, the representative experimental sites from Beijing-Shanghai high-speed railway, Wenzhou-Fuzhou railway, Shanghai-Hangzhou passenger dedicated line were chosen, which represented different region, different genetic and different treatment of soft soil. Based on the in-site test data, the bearing and deforming properties and settlement control effect were researched systematically.
Research conclusions：(1) Drainage consolidation method of soft soil was not proposed using in ballastless track because of its rigid settlement control criterion, however, combined with pre-loading technique and enough storage time, drainage consolidation method could meet the post-construction settlement requirements. (2) Using the soil-cement pile composite foundation in ballastless track should have experience and enough storage time, and it should be cautious. (3) The pile-net structure and pile-raft structure of cement-flyash-gravel pile or prestressed reinforced concrete pile could be used in soft soil foundation of ballastless track because of good settlement control effect and short stabilization time. （4）The pile-plank structure could control the settlement excellently, but because of the high cost it was only used in special conditions. (5) The conclusions could be used in the treatment method choosing and settlement control of soft soil of high-speed railway.
关键词
高速铁路 /
软土 /
沉降控制 /
地基处理
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Key words
Key words: high-speed railway /
soft soil /
settlement control /
foundation treatment
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参考文献
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