|Table of Contents|

Research on axial compression performance of defective piles reinforced by steel tube-grouting method(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年04期
Page:
167-176
Research Field:
岩土工程
Publishing date:

Info

Title:
Research on axial compression performance of defective piles reinforced by steel tube-grouting method
Author(s):
ZHANG Xingui1;  ZHANG Huai1;  ZHANG Yidan2;  LUO Chong3;  HAN Wei2;  YAN Li'e1;  JI Tianjiao4
(1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 2. Guangxi University Design Institute Co., Ltd., Nanning 530007, Guangxi, China; 3. Guangxi Geological Engineering Co., Ltd. of China National Coal Group Corporation, Nanning 530007, Guangxi, China; 4. China State Construction Engineering Corporation, Lanzhou 730099, Gansu, China)
Keywords:
reinforcement of defective pile;  steel tube-grouting method;  axial compression performance;  experimental study;  numerical simulation
PACS:
TU473.1
DOI:
10.19815/j.jace.2023.11052
Abstract:
In view of the long period and high loss of the traditional reinforcement method of defective piles, the micro-reinforcement technology based on grouting reinforcement method was greatly affected by construction factors, and there was a problem of insufficient bearing capacity. The micro-reinforcement method of steel tube-grouting method was proposed, and the axial compression test of indoor model piles was carried out. The influences of steel tube ratio and defect location on the ultimate bearing capacity of defective reinforced piles were investigated. Based on the test, an accurate finite element model was established, and the longitudinal stress distribution law of concrete and the Mises stress distribution law of steel tube were summarized. The parameters affecting the ultimate bearing capacity of the defect reinforced pile were further analyzed. The results show that the ultimate bearing capacity of the defect reinforced pile increases with the increase of the steel tube ratio, and reaches the best when the steel tube ratio increases to 2.4%. The ultimate bearing capacity of the mid-section reinforced defect reinforced pile and the lower-section reinforced defect reinforced pile can reach 4.5% and 15.8% of the complete pile respectively. The local stress concentration of the concrete section at the end of the steel tube gradually becomes obvious as the defect position moves down. The increase of the Mises stress level of the steel tube is related to the steel tube ratio and the length of the steel tube, respectively. The ultimate bearing capacity of the defect reinforced pile is proportional to the strength of the grouting body. Increasing the wall thickness of the steel pipe and the diameter of the steel pipe has little contribution to the bearing capacity. The steel pipe-grouting method is prominent in dealing with deep defects, and the ultimate bearing capacity can be increased by up to 31.20%. It is suggested that when reinforcing deep defective piles, steel pipes should be set along the whole length of the pile body and embedded in a certain depth of the stable bearing layer at the pile end.

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Last Update: 2025-07-10