Shear behaviour of sand-concrete interface with side post-grouting considering the unloading effect

被引：13

作者：

Fei, Yi ^{[1
]}

Yasufuku, Noriyuki ^{[2
]}

Zhao, Chunfeng ^{[1
]}

Zhao, Cheng ^{[1
]}

Xu, Kai ^{[1
]}

机构：

[1] Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China

[2] Kyushu Univ, Dept Civil Engn, Fukuoka 8190395, Japan

来源：

SOILS AND FOUNDATIONS | 2020年 / 60卷 / 06期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Side post-grouting; Bored-pile foundation; Large-scale shear experiment; Radial stress unloading; Interface roughness;

D O I：

10.1016/j.sandf.2020.09.002

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

Side post-grouting bored-pile foundations are widely used in geotechnical engineering. However, few studies have focused on analyzing the shear behaviour of soil and concrete while considering the grouting process. A total of 48 groups of self-developed, large-scale direct shear experiments were conducted to investigate the shear behaviour of sand-concrete interface with side-grouting, focusing on the effect of soil stress unloading and the on-site roughness measurements of bored pile. The influence of the grouting volume V, unloading rate a and interface roughness R on the shear behaviour are discussed, and the grouting modes and shear band deformation are investigated. The experimental results indicated that the grouting volume has a limited effect on improving the shear strength, and an optimal grout quantity will exist in post-grouting engineering. In addition, the unloading has a non-negligible influence on the grouting modes. (C) 2020 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.

引用

页码：1440 / 1449

页数：10

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