Displacement control in irregular deep excavation adjacent to tunnel groups in structural soil: A case study of MJS cement-soil composite piles and grouting rectification

Zhirong Xiao; Senlin Xie; Anfeng Hu; Yuan Chen; Meihui Wang

Case Studies in Construction Materials (Jul 2024)

Displacement control in irregular deep excavation adjacent to tunnel groups in structural soil: A case study of MJS cement-soil composite piles and grouting rectification

Zhirong Xiao,
Senlin Xie,
Anfeng Hu,
Yuan Chen,
Meihui Wang

Affiliations

Zhirong Xiao: School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou 310023, China
Senlin Xie: Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; Dipartimento di Ingegneria Civile e Ambientale, Politecnico di Milano, Milan 20133, Italy; Correspondence to: Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, China.
Anfeng Hu: Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; Engineering Research Center of Urban Underground Space Development of Zhejiang Province, Hangzhou 310058, China; Correspondence to: Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Yuhangtang Road 866, Hangzhou 310058, China.
Yuan Chen: Powerchina Huadong Engineering Corporation, Hangzhou 311122, China
Meihui Wang: School of Civil Engineering, Wuhan University, Wuhan 430072, China

Journal volume & issue: Vol. 20
p. e03085

Abstract

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Abstracts: With the gradual development of urban construction, more high-rise buildings with deep foundations are been constructed near tunnel groups. Analyzing how tunnels and surrounding strata respond to diverse construction strategies and challenging conditions during the excavation is crucial. This examination is instrumental in safeguarding infrastructure and minimizing construction expense. This paper explores the deformation response of structures and ground caused by irregular deep foundation pits that are excavated in structural strata adjacent to a tunnel groups (<5 m), as well as the effect of displacement control through grouting rectification techniques and Metro Jet System (MJS) isolation piles. Firstly, a finite element (FE) model is established to investigate the effects of MJS geometric and mechanical properties on deformation response for tunnels and surroundings. Then, an evaluation of the disturbance of underlying structural strata of the site is carried out to analyze the impact on deformation response. Finally, the displacement control effect of rectification technology is analyzed through a case of adjacent excavation. The results indicate that: (1) Strengthening the geometric and physical properties of MJS piles within a certain range positively contributes to deformation reduction. Additionally, increasing the length of MJS piles preferentially with the same amount of mud improves displacement control more effectively; (2) Increased soil disturbance weakens its structural integrity, amplifying the impact of excavation on structures and surroundings; (3) Employing rectification techniques proves effective in preventing excessive tunnel deformation. This study offers valuable insights for design and construction of deep excavation projects adjacent to tunnel groups.

Published in Case Studies in Construction Materials

ISSN: 2214-5095 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/case-studies-in-construction-materials

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