Study on Collapsible Loess Treated by Compaction Pile

DOI

10.2991/978-94-6463-793-9_100How to use a DOI?

Keywords

Lime soil compaction pile; treatment; collapsible loess

Abstract

An analysis was conducted on the example of treating collapsible loess in highway engineering, and it was found that the lime soil compaction pile method can reduce the soil subsidence coefficient and compression coefficient, and the larger the compression coefficient, the more obvious the effect and significantly improve the compression modulus of the foundation soil. The compaction pile method can be used to treat collapsible loess with a thickness generally ranging from 5m to 12m, and the maximum thickness should not exceed 15m. The lime soil compaction pile significantly reduces the porosity and permeability of loess by exerting lateral compression on the soil around the pile during the pore forming process, thereby reducing its collapsibility. When the distance between piles S ≤ 3D (D is the pile diameter), the circumferential stress field generated by the compaction of adjacent piles can form an effective superposition. After treatment, the collapsibility coefficient gradually increases with depth and significantly decreases compared to before treatment, with an average reduction of 94%. The deeper the depth, the more obvious the reduction effect. The compression modulus of the foundation has significantly increased, the strength of the soil has been improved, and the compressibility has decreased. The compressive modulus of the foundation increases with depth and then decreases. After treatment, the compression modulus of the foundation significantly increased, with an average increase of 144%. The deeper the depth, the more obvious the increase effect, with a maximum increase of 335%. Lime soil piles form a high-strength pile-soil composite foundation through the dual effects of physical compaction and lime soil consolidation. After being treated with lime soil compaction piles, the collapsibility coefficient is stable, and the treatment effect of collapsible loess is good.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Hongjun Li
PY  - 2025
DA  - 2025/07/28
TI  - Study on Collapsible Loess Treated by Compaction Pile
BT  - Proceedings of the 2025 8th International Conference on Traffic Transportation and Civil Architecture (ICTTCA 2025)
PB  - Atlantis Press
SP  - 1204
EP  - 1217
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-793-9_100
DO  - 10.2991/978-94-6463-793-9_100
ID  - Li2025
ER  -