Experimental study on load transfer mechanism of highway bridge pile foundation passing through huge karst cave

被引：0

作者：

Feng Z. ^{[1
]}

Chen H. ^{[1
,2
]}

Bai S. ^{[1
]}

Cai J. ^{[3
]}

Xia C. ^{[4
]}

Yuan C. ^{[4
]}

Huang Z. ^{[5
]}

机构：

[1] School of Highway, Chang'an University, Shaanxi, Xi'an

[2] School of Architecture and Civil Engineering, Xihua University, Sichuan, Chengdu

[3] Fujian Transportation Construction Quality and Safety Center, Fujian, Fuzhou

[4] Sanming Puyan Highway Limited Liability Company, Fujian, Sanming

[5] Wenshan Guangna Expressway Investment Construction Development Company Limited, Yunnan, Kunming

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷

关键词：

bridge engineering; field test; huge cave; load transfer mechanism of pile foundation; negative friction at pile side; pile foundations;

D O I：

10.13722/j.cnki.jrme.2022.0349

中图分类号：

学科分类号：

摘要：

The field test of bridge pile foundation passing through the cave 25.5 m in height were carried out to explore the load transfer mechanism of the pile foundation of highway bridge passing through the super-large cave. The vertical bearing characteristics and load transfer mechanism of the pile foundations passing through the caves with different height were studied when the backfilling method was used to treat the karst cave. The maximum value of negative friction caused by consolidation settlement of the backfill materials and the proportion of its distribution range were proposed. The results show that:when the load is small, the axial force of the pile foundation passing through the super-large cave increases in a certain range, and the negative friction resistance of pile foundation is generated after the cave is backfilled. The vertical ultimate bearing capacity of the pile foundation decreases with the increasing height of karst cave. When the height of the cave increases from 5 m to 30 m, the maximum negative friction resistance under ultimate load increases by 102.7%, and the proportion of its range increases from 0% to 24%. When the height of the cave exceeds 25 m, the negative friction range accounts for more than 20%. If the backfill method is used to treat the cave, it was recommended that when the height of the cave was 5 m to 10 m, the influence of negative friction resistance could be ignored. When the cavern is very large, the adverse effect of negative friction resistance on vertical bearing characteristics of pile foundation should be considered. When the cavern height is 15, 20, 25, 30 m, it is recommended to calculate the bearing capacity of the piles according to negative friction resistance within 0.092 H, 0.145 H, 0.213 H, 0.240 H (cavern height) from the cavern top. © 2023 Academia Sinica. All rights reserved.

引用

页码：3700 / 3711

页数：11

共 25 条

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