Analysis and Evaluation of the Deformation of Pile Foundation Next to Filling under the Soft Ground Pre-Treatment of Rigid Long-Short Pile

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Abstract This paper utilizes numerical simulation software and the solid engineering of the Mali River II Bridge as a case study to understand the application effect of rigid long-short pile on the soft soil layer under the side roadbed, to analyze the influence of different factors on the treatment performance of rigid long-short pile, and to determine how the use of rigid long-short piles affect the lateral foundation in high subgrade fill. The treatment effect and stress distribution characteristics of the rigid long-short pile under different layout patterns and treatment distances are also analyzed, and related engineering proposals are proposed. Under lateral loading, the lateral compression deformation of the soft interlayer significantly affects the displacement of the pile, the resistance of the soil on the side of the pile, and the bending moment of the pile. A significant inflection point is observed in the displacement of the pile body at 16 m (interface between the soft soil layer and the strong weathered rock formation), and the resistance of the pile side soil and bending moment of the pile body reach their maximum at 16 m. The pile foundation shows a similar displacement in different positions yet shows various degrees of influence. The most disadvantageous position is located closest to the outside of the pile, and the bearing capacity of the side pile foundation can be improved by utilizing an appropriate design. Compared with square and staggered layouts, the rigid long-short piles in the quincunx layout play the most significant roles in reducing the effect of the lateral deformation of the weak intercalated layer on the bridge pile foundation. The treatment effect of the reinforcement zone in the quincunx layout differs under various treatment distances. The treatment distance of the reinforcement zone should neither be too close to nor too far from the pile foundation, and a treatment distance of 8 m is considered optimal.

Key words： bridge engineering ground treatment numerical simulation weak intercalated laver surcharge load rigid long-short pile

Received: 21 August 2019

Fund:Supported by the Project of Fundamental Research Business Fees of Central Universities (No.300102218115)

Corresponding Authors: HE Jing-bin E-mail: hejingbin_0407@163.com

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	HE Jing-bin
	FENG Zhong-ju
	DONG Yun-xiu
	FENG Kai
	ZHU Yan-ming

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HE Jing-bin,FENG Zhong-ju,DONG Yun-xiu, et al. Analysis and Evaluation of the Deformation of Pile Foundation Next to Filling under the Soft Ground Pre-Treatment of Rigid Long-Short Pile[J]. Journal of Highway and Transportation Research and Development, 2019, 13(4): 44-55.

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http://manu27.magtech.com.cn/Jwk_gljtkj_en/EN/ OR http://manu27.magtech.com.cn/Jwk_gljtkj_en/EN/Y2019/V13/I4/44

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