Effect of pile side tandem-type cavities on the settlement of pile under vertical load in karst area

Xu, Jianjun, Luo, Haisha, Guo, Zhijian, Bao, Yaoyao, Lou, Xie, Jin, Fei ORCID: https://orcid.org/0000-0003-0899-7063, Ma, Xinquan and Cao, Zhenxin 2025. Effect of pile side tandem-type cavities on the settlement of pile under vertical load in karst area. Li, P., Yang, M., Lanzinha, J., Wang, Z., Yang, E. and Feng, G., eds. Hydraulic and Civil Engineering Technology X, Advances in Transdisciplinary Engineering, pp. 566-574. (10.3233/ATDE251277)

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Abstract

In order to investigate the influence of tandem-type karst cavities on the lateral side of pile foundations on the settlement behavior and stability under loading conditions, this study was conducted within the context of the East Block Project of the Lianrong Village Resettlement Housing Project in Hangzhou Xianlin Street. Field vertical static load tests were performed on single piles, considering three representative single pile models under different working conditions. Theoretical modifications were applied to analyze the im-pact of lateral cavities on the pile body. The results indicate that under the influence of tandem small-sized cavities, the initial loading phase induces a steep settlement due to the presence of multiple cavities, followed by a more elastic settlement phase. A second steep settlement occurs at the final stage of loading. During the unloading process, the load-displacement curve of the pile exhibits a parabolic rebound trend, with residual deformation observed after complete unloading. Preconstruction treatment of tandem-type cavities ensures stable linear elastic behavior under smaller loads, although larger loads still disturb the surrounding soil. Penetration of single piles through lateral cavities triggers debonding at the pile-soil interface, leading to a redistribution of shear stresses around the cavity soil. This results in pile settlement and deflection, increasing the vertical displacement at the pile head and reducing the stability of the single pile.

Item Type:	Book Section
Date Type:	Publication
Status:	Published
Schools:	Schools > Engineering
ISBN:	9781643686356
ISSN:	2352-751X
Date of First Compliant Deposit:	7 January 2026
Last Modified:	07 Jan 2026 12:31
URI:	https://orca.cardiff.ac.uk/id/eprint/183665

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