Analysis of the cracking mechanism of pile foundations in piled wharf at coastal port under siltation condition of the bank slope

REN Jingyu, WANG Kunpeng, CUI Chunyi, ZHAO Min, LIU Hailong, XIONG Qi

doi:10.16411/j.cnki.issn1006-7736.2025.01.016

2025 , Vol. 51 >Issue 1: 151 - 162

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2025.01.016

Analysis of the cracking mechanism of pile foundations in piled wharf at coastal port under siltation condition of the bank slope

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（1.Transportation Management College, Dalian Maritime University, Dalian 116026, China；2. CCCC Third Harbor Consultants Co., LTD., Shanghai 200000, China)

Online published: 2024-04-20

Supported by

国家重点研发计划项目(2021YFB2601102)

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Abstract

Bank slope siltation and pile foundation cracking damage are common issues in coastal port high-piled wharves in China, posing a significant threat to the safe operation of the wharves. To implement effective maintenance measures, such as bank slope desilting and pile repair, the primary task is to understand the cracking mechanism of wharf piles under bank slope siltation. The paper investigated the siltation status of bank slopes of 16 major coastal ports in Jiangsu and Zhejiang regions, as well as the cracking of pile foundations of 7 typical wharves. Based on specific engineering, finite element models of the interaction between silted bank slope and wharf pile foundations were established, and the force and deformation characteristics of the pile-soil system were analyzed. The plastic deformation state of the pile foundation, as determined by the internal force combination value, was largely consistent with the actual location of the wharf pile cracking axis. This confirmed the validity of the modeling approach. A total of seven factors were selected for orthogonal testing in terms of both the engineering geological conditions of the bank slope and the structural parameters of the piled wharf, and the sensitivity of each factor to the internal force of the pile foundation was determined using extreme deviation analysis. The main conclusions are as follows. In marine environment, sediment continues to silt back under and behind piled wharf can cause sustained deformation of soft soil layers, leading to the passive pile problem. As the bank slope is silted, the soil beneath the wharf moves significantly towards the sea, causing large horizontal displacement of neighboring piles. This leads to a surge in the axial force and bending moment of the pile foundations, which in turn induces the top or the maximum pile displacement of some piles to exceed the limit of elastic-plastic deformation. Moreover, during the siltation process, the shoreward sloping piles at the rear of the wharf have greater additional internal forces, making them more susceptible to cracking and damage. The axial force and bending moment at the top of the piles under siltation conditions are more sensitive to the structure parameters and the slope of the bank slope.

Key words： piled wharf; silted bank slope; pile foundation cracking; passive pile

Cite this article

REN Jingyu, WANG Kunpeng, CUI Chunyi, ZHAO Min, LIU Hailong, XIONG Qi . Analysis of the cracking mechanism of pile foundations in piled wharf at coastal port under siltation condition of the bank slope[J]. Journal of Dalian Maritime University, 2025 , 51(1) : 151 -162 . DOI: 10.16411/j.cnki.issn1006-7736.2025.01.016

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