超短桩处理无砟轨道深厚含砾黏土试验研究

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Abstract Research purposes: The hard plastic gravelly clay belongs to the medium compressibility clay. As the ballastless track foundation, the deep gravelly clay has no problem in stability. However, there are few research results on how to deal with the foundation. According to the traditional concept, the maximum treatment depth of high-speed railway ballastless track foundation is 30 m when it meets similar soil, and the cost of foundation treatment is high. It is worth studying whether the lighter treatment measures such as short piles can be used to meet the requirements of post-construction settlement. Based on the in-situ test of the treatment of deep gravel clay foundation with extra-short pile, the change rules of foundation settlement, deep settlement, lateral displacement, and earth pressure are determined to accumulate experience for the treatment of deep gravel clay foundation of ballastless track of high-speed railway.
Research conclusions: (1)When the gravel clay foundation is 26 m thick and the embankment is 7 m high, the ultra short pile of 6 m can meet the requirements of post-construction settlement of ballastless track. It is of great significance to optimize the medium compression foundation treatment of high-speed railway. (2)The total settlement of the deep gravel clay foundation is small, the maximum settlement is about 8.7 cm, and the settlement of the foundation has the law of rapid convergence. When the filling is completed, the settlement accounts for 84.7%~86.4% of the total settlement, which is very beneficial to control the post-construction settlement. (3)The pile-soil stress ratio of composite foundation with short pile increases with the increase of load. The average value of pile-soil stress ratio after load stabilization is 2.9, and the foundation soil also bears about 80% of the earth pressure. (4)The research results can provide basis and reference for the foundation treatment of medium compressibility soil of high-speed railway, and accumulate data for relevant specifications.

Key words： railway engineering gravel clay ultra-short CFG pile experimental study

Received: 21 January 2022

PACS:

TU413.62

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	WANG Xiang

Cite this article:

WANG Xiang. Experimental Research on the Treatment of Deep Gravel Clayin Ballastless Track by Ultra-short CFG Pile[J]. Journal of Railway Engineering Society, 2022, 39(4): 26-30.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I4/26

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