Multi-Scale Research on the Mechanisms of Soil Arching Development and Degradation in Granular Materials with Different Relative Density

Author:

Liang Luju12ORCID,Cheng Yi Pik3ORCID,Fan Xiaozhen12ORCID,Ding Zhi12,Xu Changjie45ORCID

Affiliation:

1. Institute of Civil Engineering, Hangzhou City University, Hangzhou 310015, China

2. Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou City University, Hangzhou 310015, China

3. Department of Civil, Environmental and Geomatic Engineering, University College London, London WC1E 6BT, UK

4. State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, China

5. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310012, China

Abstract

Soil arching is significantly influenced by relative density, while its mechanisms have barely been analyzed. A series of DEM numerical simulations of the classical trapdoor test were carried out to investigate the multi-scale mechanisms of arching development and degradation in granular materials with different relative density. For analysis, the granular assembly was divided into three zones according to the particle vertical displacement normalized by the trapdoor displacement δ. The results show that before the maximum arching state (corresponding to the minimum arching ratio), contact forces between particles in a specific zone (where the vertical displacement of particles is larger than 0.1δ but less than 0.9δ) increase rapidly and robust arched force chains with large particle contact forces are generated. The variation in contact forces and force chains becomes more obvious as the sample porosity decreases. As a result, soil arching generated in a denser particle assembly is stronger, and the minimum value of the arching ratio is increased with the sample porosity. After the maximum arching state, the force chains in this zone are degenerated gradually, leading to a decrease in particle contact forces in microscale and an increase in the arching ratio in macroscale. The recovery of the arching ratio after the minimum value is also more significant in simulations with a larger relative density, as the degeneration of contact force chains is more obvious in denser samples. These results indicate the importance of contact force chain stabilities in specific zones for improving soil arching in engineering practice.

Funder

National Key R&D Program of China

Natural Science Foundation of Zhejiang Province of China

National Natural Science Foundation of China

Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province

Publisher

MDPI AG

Reference44 articles.

1. Terzaghi, K. (1943). Theoretical Soil Mechanics, John Wiley and Sons.

2. Numerical analysis of geosynthetic-reinforced and pile-supported earth platforms over soft soil;Han;J. Geotech. Geoenviron. Eng.,2002

3. Iglesia, G.R. (1991). Trapdoor Experiments on the Centrifuge: A Study of Arching in Geomaterials and Similitude in Geotechnical Models. [Ph.D. Thesis, Massachusetts Institute of Technology].

4. Experimental and discrete element modeling studies of the trapdoor problem: Influence of the macro-mechanical frictional parameters;Chevalier;Acta Geotech.,2012

5. Investigation of soil arching with centrifuge tests;Iglesia;J. Geotech. Geoenviron. Eng.,2014

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3