超大直径嵌岩桩基础竖向受荷性状研究

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Abstract Research purposes:There are more and more applications of super-large diameter piles. Further research is needed on the working performance of super-large diameter pile foundations and whether conventional design methods can still be used. In this paper, based on the super-large diameter pile foundation of the Yelanghe Railway Bridge, combined with the specific geological conditions, the FLAC^3D software is used to simulate and analyze the vertical load characteristics of the large-diameter single-pile foundation.
Research conclusions:(1) For rock-socketed piles that are completely embedded in strong rock formations or large-diameter pile foundations with high strength of overlying rock formations, when the length-diameter ratio of the piles is greater than 1.8, the lateral resistance curve of the pile foundation is shown as "large on the top and small on the bottom" shape. With the shortening of the pile length and the reduction of the length-diameter ratio, the upper lateral resistance of the pile gradually decreases and the lower lateral resistance gradually increases. When the length-diameter ratio is very small, it becomes a "big at both ends, small in the middle" shape. (2) Only when the elastic modulus of the rock layer on the side of the pile is small or the strength of the overlying soil layer is weak (such as clay) with a super large diameter pile foundation, the lateral resistance curve shows the shape of "small on the top and large on the bottom", and the smaller the elastic modulus of the rock layer on the side of the pile, or the weaker the overlying soil layer, the more obvious this characteristic is. (3) The optimal length-diameter ratio of super-large diameter piles is less than 3, which is smaller than that of small-diameter piles. (4) For the super-large diameter pile foundation of the same diameter, the pile lateral resistance will show three different distribution patterns according to the different elastic modulus of the pile side rock formation. (5) The research results can provide guidance and reference for the research and application of super-large diameter pile foundations.

Key words： rock-socketed pile pile foundation length-diameter ratio vertical load lateral resistance

Received: 26 September 2022

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	Articles by authors
	SONG Suidi
	PENG Xiongzhi
	YANG Quan
	FENG Zhengxin
	GUO Lunbo

Cite this article:

SONG Suidi,PENG Xiongzhi,YANG Quan, et al. Research on the Characters of Super-large Diameter Rock-socketed Pile Foundation under Vertical Load[J]. Journal of Railway Engineering Society, 2023, 40(2): 47-52.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2023/V40/I2/47

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