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Symmetry
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Physically Data-Driven Research on Symmetry/Asymmetry in Underground Engineering Construction and...
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Physically Data-Driven Research on Symmetry/Asymmetry in Underground Engineering Construction and Maintenance

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 2381

Special Issue Editors

Dr. Jiayao Chen

E-Mail Website
Guest Editor
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
Interests: data fusion; computer vision; underground space; tunneling; rock engineering
Special Issues, Collections and Topics in MDPI journals
Dr. Wengui Huang

E-Mail Website
Guest Editor
Lecturer, School of Computing, Engineering, and Digital Technologies, Teesside University, Middlesbrough TS1 3BX, UK
Interests: climate resilience and adaptation of geo-infrastructure; low carbon geotechnical construction; big data analytics for geotechnical assets management; landslide hazard research in developing countries
Dr. Zhongkai Huang

E-Mail Website
Guest Editor
1. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China
2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
Interests: tunnel engineering; numerical modeling in geotechnical engineering; vulnerability assessment; probabilistic risk analysis; resilience engineering
Special Issues, Collections and Topics in MDPI journals
Dr. Wuqiang Cai

E-Mail Website
Guest Editor
Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China
Interests: 3D strength and constitutive theories; stress control in deep tunneling; digital in-situ test and real-time design of deep tunneling

Special Issue Information

Dear Colleagues,

The field of tunnel and underground engineering has been witnessing significant advancements due to the growing demand for efficient transportation and infrastructure systems in modern urban environments. Symmetry and asymmetry are critical aspects that impact the performance, safety, and sustainability of underground structures. However, there remains a knowledge gap in terms of comprehending the intricate relationship between these principles and their implications for tunnel design, construction, and maintenance. This Special Issue aims to bridge this gap by promoting physically data-driven research on symmetry and asymmetry in tunnel and underground engineering construction and maintenance. The integration of physical modeling and data-driven methodologies has the potential to provide a deeper understanding of the influence of symmetry and asymmetry on the structural behavior, geotechnical interactions, and overall performance of underground projects.

Researchers and practitioners from various disciplines are encouraged to contribute their latest findings, innovative methods, and case studies to shed light on this important topic. The Special Issue seeks to foster collaboration and knowledge exchange, with the ultimate goal of advancing the state of the art in tunnel and underground engineering.

Potential topics of interest include, but are not limited to, the following:

  • Fundamental principles of symmetry and asymmetry in underground engineering;
  • Physical modeling techniques for assessing symmetry and asymmetry;
  • Data-driven analysis of tunnel behavior;
  • Advancements in physical modeling;
  • Structural integrity and safety;
  • Optimization of tunnel design and maintenance;
  • Case studies in symmetrical and asymmetrical tunnel design;
  • Risk assessment and mitigation;
  • Sustainable and resilient tunnel design;
  • Future perspectives in tunnel engineering.

This Special Issue provides a platform for researchers and practitioners to share their expertise, foster innovative ideas, and promote excellence in tunnel and underground engineering with a focus on the role of symmetry and asymmetry in shaping the future of urban infrastructure.

We look forward to receiving your contributions.

Dr. Jiayao Chen
Dr. Wengui Huang
Dr. Zhongkai Huang
Dr. Wuqiang Cai
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (3 papers)

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Research

19 pages, 6803 KiB  
Article
Load Calculation Method for Deep-Buried Layered Soft Rock Tunnel Based on Back-Analysis of Structural Deformation
by Lixin Zhang, Lijun Chen, Jianxun Chen, Yanbin Luo, Huijie Guo, Yang Zhai and Pengkun Wang
Symmetry 2024, 16(4), 383; https://doi.org/10.3390/sym16040383 - 23 Mar 2024
Viewed by 688
Abstract
After the excavation and unloading of deep-buried soft rock tunnels, support structures often experience deformation-related disasters such as concrete cracking, steel frame bending and twisting, and primary support instability under different forms of load. Accurately calculating the load borne by the primary support [...] Read more.
After the excavation and unloading of deep-buried soft rock tunnels, support structures often experience deformation-related disasters such as concrete cracking, steel frame bending and twisting, and primary support instability under different forms of load. Accurately calculating the load borne by the primary support structure is the key to ensuring design rationality and construction safety. Especially in layered soft surrounding rock formations, the magnitude and distribution of the loads are different from those of conventional rock and soil masses, resulting in limited applicability of existing load calculation methods to similar formations. Therefore, based on the measured deformation of the tunnel structure, while considering the different geometric forms of the primary support structure during partial excavation, this paper proposes a deformation-structure (D-S) load calculation method. By comparing the calculation results of this method and a large number of sample data for typical deep-buried layered soft rock tunnels, the reliability of the D-S load calculation method is verified. In addition, the variation law of the loads during the tunnel construction period is enunciated, and the magnitude and distribution of the loads acting on the primary support are clarified. The D-S load calculation method provides a theoretical basis for load calculation in deep-buried layered soft rock tunnels. Full article
(This article belongs to the Special Issue Physically Data-Driven Research on Symmetry/Asymmetry in Underground Engineering Construction and Maintenance)
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24 pages, 12805 KiB  
Article
Mechanical Behavior of Secondary Lining in Super Large-Span Tunnels Considering Temperature Effects
by Fangfang Dong, Yanbin Luo, Jianxun Chen, Chuanwu Wang, Yahui Liu and Wenjie Xun
Symmetry 2024, 16(3), 339; https://doi.org/10.3390/sym16030339 - 12 Mar 2024
Viewed by 618
Abstract
Temperature stress has a significant impact on the structural stress of (super) large-span tunnel lining, which can easily lead to structural fatigue damage and premature cracking. With the increasing scale and quantity of super large-span tunnels, the issue of temperature stress in secondary [...] Read more.
Temperature stress has a significant impact on the structural stress of (super) large-span tunnel lining, which can easily lead to structural fatigue damage and premature cracking. With the increasing scale and quantity of super large-span tunnels, the issue of temperature stress in secondary lining has attracted widespread attention. Previous studies have paid little attention to the influence of temperature stress on the structural internal forces of ordinary small–medium-span tunnels, but this influence cannot be ignored for super large-span tunnels. We take the Letuan Tunnel (a double-hole eight-lane tunnel) of the Binzhou-Laiwu expressway renovation and expansion project in Shandong Province as a case study and analyze the mechanical response of the secondary lining through on-site measurement. Moreover, a numerical simulation was conducted to evaluate the effects of self-weight and temperature stress on the secondary lining of the case tunnel. The results indicate that: the stress of the secondary lining concrete and steel bars is greatly affected by seasonal temperature changes. The compressive stress of the concrete and steel bars is significantly greater in summer than in winter, and the tensile stress is greater in winter than in summer. Furthermore, multiple measurement points have shown a phenomenon of transition between tensile and compressive stress states. The stress of concrete and steel bars fluctuates periodically with a sine function over time, with a fluctuation period of one year. The structural stress increases with the increase of summer temperature and decreases with the decrease of winter temperature. The fluctuation amplitude of stress in the inner side of the lining concrete and steel bars is greater than that on the outer side. Among them, the stress amplitudes of the inner and outer sides of the concrete are between 0.77–1.75 MPa and 0.44–1.07 MPa, respectively, and the stress amplitudes of the inner and outer steel bars are between 5–31 MPa and 7–13 MPa, respectively. The safety factors in summer are lower than those in winter. The minimum safety factors for secondary lining in summer and winter are 3.4 and 4.6, respectively, which can meet the safety requirements for service. The average axial forces of the secondary lining under the coupling effects of self-weight and temperature in winter and summer are 528 MPa and 563 MPa, respectively, which are significantly greater than the combined axial forces under their individual effects. The bending moment distribution of the secondary lining at the tunnel vault, inverted arch, wall spring and other positions under the coupling effect of self-weight and temperature is different from or even opposite to the bending moment superposition result under the two individual actions. The achieved results reveal that the influence of temperature stress on the service performance of the lining structure cannot be ignored, and the research results can provide useful reference for similar tunnels and related studies. Full article
(This article belongs to the Special Issue Physically Data-Driven Research on Symmetry/Asymmetry in Underground Engineering Construction and Maintenance)
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13 pages, 5884 KiB  
Article
A New Symmetry-Enhanced Simulation Approach Considering Poromechanical Effects and Its Application in the Hydraulic Fracturing of a Carbonate Reservoir
by Chuanrui Wang, Yao Yue, Zhongkai Huang, Yue Tong, Wei Zhang and Shiying Ye
Symmetry 2024, 16(1), 105; https://doi.org/10.3390/sym16010105 - 15 Jan 2024
Viewed by 703
Abstract
The exploration of fractured-vuggy carbonate reservoirs usually involves hydraulic fracturing to maximize recovery. At present, effectively communicating natural discontinuities is a technical challenge. In this article, we investigated the origin and propagation of cracks in fractured-vuggy reservoirs using discrete element hydraulic fracturing simulations [...] Read more.
The exploration of fractured-vuggy carbonate reservoirs usually involves hydraulic fracturing to maximize recovery. At present, effectively communicating natural discontinuities is a technical challenge. In this article, we investigated the origin and propagation of cracks in fractured-vuggy reservoirs using discrete element hydraulic fracturing simulations that included poromechanical effects. A particular focus on the microscopic force-displacement symmetry of adjacent pore pressures is introduced. Our results demonstrate that the poromechanical effect significantly increases the strength of overpressurized reservoir formations. Moreover, the effect of injected fluid viscosity on the hydraulic fracturing effectiveness was studied through two simulation tests. The outcomes highlight the critical influence of fluid viscosity on the propagation of micro-cracks in overpressure fractured-vuggy reservoirs. Full article
(This article belongs to the Special Issue Physically Data-Driven Research on Symmetry/Asymmetry in Underground Engineering Construction and Maintenance)
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