Research and Applicat ion of Ultra Large-Scale Consolidated Under-Reamed Drilled Shaft Technology under Special Environmental and Geological Conditions

Authors

DING Yi, Shandong Provincial Communications Planning and Design Institute Group Co ., Ltd., Jinan, Shandong 250031, ChinaFollow
YU Kun, Shandong Provincial Communications Planning and Design Institute Group Co ., Ltd., Jinan, Shandong 250031, China
SHI Haiyang, Tianjin Transportation Science Research Institute, Tianjin 300074, China
PEI Xiaofeng, Guangdong Panshi Foundation Engineering Technology Co ., Ltd., Shenzhen, Guangdong 518101, China
ZHU Bo, Guangdong Panshi Foundation Engineering Technology Co ., Ltd., Shenzhen, Guangdong 518101, China

Abstract

This article aims to add ress the poor economic efficiency of large-diameter and ultra-long piles,the high risk of hole collapse in thick sandy soil,and the limited space across the canal faced by the Bridge over Yellow River Diversion to Qindao Canal on Zhanhua ‒ Linyi Expressway.According to the comparison of conventional drilled cast-in-place piles with combined pile-end and pile-side post-grouting,the industry ’s under-reamed drilled shaft foundation with the largest disc diameter (4.5 m) and the largest single-pile volume (456 m3) was proposed and designed.At the same time,supporting devices such as three-arm rotary cutting drill bits and long arm borehole diameter meters were developed,and key quality control technologies such as consolidation body construction and disc cavity reaming construction were tackled.The research results show that with the development and innovative application of various construction equipment,the construction of consolidated under-reamed drilled shafts can be smoothly carried out.The integrity of the pile body concrete is classified as Class I,and the self-balancing bearing capacity meets the design requirements.Compared with conventional drilled cast-in-place piles,this technology can reduce the steel reinforcement consumption by 37.4% and concrete consumption by 57.7%,and increase the bearing capacity of a single pile by 33.9%,effectively avoiding the risk of hole collapse of thick sandy soil.The technology of consolidated under-reamed drilled shafts has significant economic,social,and environmental benefits.

Publication Date

12-24-2025

DOI

10.14048/j.issn.1671-2579.2025.06.024

First Page

209

Last Page

217

Submission Date

December 2025

Recommended Citation

Yi, DING; Kun, YU; Haiyang, SHI; Xiaofeng, PEI; and Bo, ZHU (2025) "Research and Applicat ion of Ultra Large-Scale Consolidated Under-Reamed Drilled Shaft Technology under Special Environmental and Geological Conditions," Journal of China & Foreign Highway: Vol. 45: Iss. 6, Article 24.
DOI: 10.14048/j.issn.1671-2579.2025.06.024
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss6/24

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