Settlement characteristic at the junction area of surcharge preloading and semi-rigid composite foundation in soft soil sites

SHEN Minglong; DAI Yiming; CHEN Huahan

doi:10.20265/j.cnki.issn.1007-2993.2025-0257

Volume 40 Issue 5

Oct. 2026

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Article Navigation > GEOTECHNICAL ENGINEERING TECHNIQUE > 2026 > 40(5): 664-671

SHEN Minglong, DAI Yiming, CHEN Huahan. Settlement characteristic at the junction area of surcharge preloading and semi-rigid composite foundation in soft soil sites[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(5): 664-671. doi: 10.20265/j.cnki.issn.1007-2993.2025-0257

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SHEN Minglong, DAI Yiming, CHEN Huahan. Settlement characteristic at the junction area of surcharge preloading and semi-rigid composite foundation in soft soil sites[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(5): 664-671. doi: 10.20265/j.cnki.issn.1007-2993.2025-0257

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Settlement characteristic at the junction area of surcharge preloading and semi-rigid composite foundation in soft soil sites

doi: 10.20265/j.cnki.issn.1007-2993.2025-0257

Fujian Provincial Institute of Architectural Design and Research Co., Ltd., Fuzhou 350001, Fujian, China

Received Date: 2025-06-09
Accepted Date: 2025-11-11
Rev Recd Date: 2025-08-29

Available Online: 2026-10-08

Publish Date: 2026-10-08

Abstract

Abstract

To investigate the deformation characteristics of the junction area between surcharge preloading and semi-rigid composite foundation treatments, this paper takes a ground treatment project in a deep soft soil site as an example. A finite element model of the junction area with two different ground treatment types is established to analyze the long-term development trends of surface settlement and differential settlement in the post-construction stage. The results show that: (1) The development rates of both surface settlement and differential settlement in the junction area decrease year by year; (2) The location of the maximum differential settlement continuously shifts from the junction interface towards the composite foundation area over time, ultimately locating at a position 1.9 times the height of the surcharge slope shoulder outside, and is unaffected by the pile spacing; (3) The maximum value of the surface slope rate exhibits a nonlinear relationship with the pile-soil replacement ratio, and when the replacement ratio is lower than 0.13, the control effect on the maximum differential settlement is significant; (4) Using a surface slope rate of 0.5% as the standard, the critical replacement ratio for exceeding the limit is approximately 0.114. When the replacement ratio is lower than this value, the differential settlement in the junction area exceeds the limit. For common replacement ratios of composite foundations, the overlimit range is symmetrically distributed around the position of the maximum value, with a width within 16 meters.
- ground treatment junction area,
- soft soil,
- surcharge preloading,
- composite foundation,
- settlement

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References

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Settlement characteristic at the junction area of surcharge preloading and semi-rigid composite foundation in soft soil sites

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Settlement characteristic at the junction area of surcharge preloading and semi-rigid composite foundation in soft soil sites

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