Metal-soil interface adhesion in clay clogging during shield tunneling: Theoretical model and experimental validation

被引：7

作者：

Fang, Yong ^{[1
]}

Zhuo, Bin ^{[1
]}

Wang, Yubo ^{[1
]}

Luo, Hu ^{[1
]}

Sun, Junfeng ^{[1
]}

Yao, Yuxiang ^{[1
]}

机构：

[1] Southwest Jiaotong Univ, Key Lab Transportat Tunnel Engn, Minist Educ, Chengdu 610031, Peoples R China

来源：

UNDERGROUND SPACE | 2024年 / 15卷

基金：

中国国家自然科学基金;

关键词：

EPB clogging; Adhesion stress; Mechanics model; Clays; Mechanism analysis; Experimental test;

D O I：

10.1016/j.undsp.2023.08.013

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Clogging is a major geohazards risk in mechanized tunnelling through cohesive soils. Clay clogging results from the high adhesion between the clay and metal. Based on the water film theory and Reynolds fluid equation, the interfacial adhesion between metal and soil is simplified in this study as viscous hydrodynamic behavior between planes. Considering the influence of capillary force and the viscous force of water film at the interface between metal and soil, a theoretical calculation model of interfacial adhesion between metal and soil is established. The influence of water film thickness and separation rate on the interfacial adhesion between metal and soil is qualitatively analyzed. Then, the adhesion stress between the clay and the metal surface was tested with a pullout test and the influence of moisture content, pullout rates and types of clay minerals on the adhesion stress was analyzed. Finally, the calculation model of adhesion force was compared with the experimental results. The calculation model of soil adhesion stress established in this paper can quantitatively describe the relationship between soil adhesion force and moisture content and can also qualitatively reveal the influence mechanism of soil moisture content on adhesion stress.

引用

页码：188 / 202

页数：15

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