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| Study on Techniques for Collapsible Loess Foundation Treatment of Zhengzhou-Xi'an Passenger Dedicated Line |
| YAO Yu-chun, LI An-hong, LUO Zhao-xin, SUN Ying |
| China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China |
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Abstract 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'an 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 Dedicated Line, 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.
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Received: 15 March 2013
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2013, Vol. 30 
