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Key Technologies for Urban Underground Space Development in Coastal Soft Soil Areas

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Earth Sciences".

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 6838

Special Issue Editors

Dr. Jianlin Yu

E-Mail Website
Guest Editor
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
Interests: soft soil mechanics; urban underground space development; ground treatment
Prof. Dr. Riqing Xu

E-Mail Website
Guest Editor
Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
Interests: soft soil mechanics; urban underground space development
Prof. Dr. Changfu Chen

E-Mail Website
Guest Editor
College of Civil Engineering, Hunan University, Changsha 410082, China
Interests: slope stability analysis; foundation treatment; geotechnical testing
Special Issues, Collections and Topics in MDPI journals
Dr. Jiajin Zhou

E-Mail Website
Guest Editor
Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
Interests: tunnelling and underground space; soft soil treatment

Special Issue Information

Dear Colleagues,

In recent years, the “urban diseases” caused by the rapid expansion of coastal cities, such as shortage of land resources, traffic congestion, and environmental degradation, have become increasingly prominent. The full development of urban underground space resources and the overall planning of the integrated and comprehensive utilization of above-ground and underground space have become key measures to improve the overall carrying capacity and resilience of the city. Due to the complex engineering properties of coastal soft soil, and the fact that underground engineering projects tend to be large-scale, dense, and three-dimensional, it is urgent to reveal the coordination mechanism of geological body-structure deformation under complex conditions and explore the key technology path to ensure the safety and resilience of the construction operation and maintenance of the underground space in coastal cities.

This Special Issue plans to systematically review and forecast the frontier development of underground space development technology in coastal soft soil areas from multiple dimensions, such as underground space development theory, construction technology, intelligent monitoring, and environmental impact control, aiming to provide theoretical guidance and technology for coastal city underground engineering construction support and improve the development level of underground space in coastal cities.

Topics of interest include:

  1. New development of underground space development theory;
  2. New technology for underground space development;
  3. Environmental impact and control of underground space development;
  4. Intelligent monitoring and risk early warning technology for underground engineering;
  5. Key technologies for intelligent underground space construction;
  6. Waste resource utilization technology in underground space development processes.

Dr. Jianlin Yu
Prof. Dr. Riqing Xu
Prof. Dr. Changfu Chen
Dr. Jiajin Zhou
Guest Editors

Manuscript Submission Information

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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.

Keywords

  • underground space
  • environmental impact and control
  • intelligent monitoring
  • intelligent underground space construction
  • waste resource utilization

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Published Papers (4 papers)

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Research

16 pages, 8210 KiB  
Article
Numerical Analysis of Shield Tunnelling Breakthrough Working Shaft by Artificial Ground Freezing Method under Extreme Conditions Considering Phase Change Latent Heat
by Shengjun Deng, Yang He, Mingqi Yang, Feng Zhou, Heng Liu, Rui Zhu and Zhihui Wan
Appl. Sci. 2023, 13(6), 3651; https://doi.org/10.3390/app13063651 - 13 Mar 2023
Cited by 3 | Viewed by 1473
Abstract
The artificial ground freezing method has been widely used in shield tunneling breakthrough working shafts. The freezing effect was mainly considered in the previous research, and the heat generation of the shield machine was not considered, which has great influence in actual engineering. [...] Read more.
The artificial ground freezing method has been widely used in shield tunneling breakthrough working shafts. The freezing effect was mainly considered in the previous research, and the heat generation of the shield machine was not considered, which has great influence in actual engineering. In this paper, a coupling calculation model, considering phase change latent heat, is establishes that by containing the freezing process and heat generation of the shield machine, the model is verified. A numerical simulation is carried out for several working conditions that may occur in actual projects, and the following conclusions are obtained. Although the heat dissipated by the normal tunneling of the shield machine will melt the frozen soil curtain that originally meets the design requirements, the thickness of the frozen soil curtain after melting cannot reach the initial design, though it is still within the safe range. In the process of a continuous rotation working condition, the bottom and sides of a cup-shaped frozen soil curtain are partially melted in the early 6 day stay of the shield machine, and the thickness is reduced to a relatively stable value of 0.8 m. In a temporary shutdown working condition, when the contact surface temperature between the shield machine shell and the frozen soil drops to −12 °C after almost 4 days of shutdown, the shield machine may not keep tunneling forward due to the freezing effect. The research results will benefit the freezing design and management of the shield tunneling breakthrough working shaft under extreme conditions. Full article
(This article belongs to the Special Issue Key Technologies for Urban Underground Space Development in Coastal Soft Soil Areas)
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13 pages, 4112 KiB  
Article
Experimental Study on Engineering Properties of Cemented Soil with High Water Content
by Jianlin Yu, Zihao Mao, Jiajin Zhou, Zhongxiang Yu, Xiangwu Liu and Xiaonan Gong
Appl. Sci. 2023, 13(2), 937; https://doi.org/10.3390/app13020937 - 10 Jan 2023
Cited by 4 | Viewed by 1669
Abstract
A series of unconsolidated-undrained triaxial tests and unconfined compressive strength (UCS) tests for cemented soils with different curing times were carried out in this research. In total, three cemented soil mixtures with different cement contents were adopted in the tests, and the confining [...] Read more.
A series of unconsolidated-undrained triaxial tests and unconfined compressive strength (UCS) tests for cemented soils with different curing times were carried out in this research. In total, three cemented soil mixtures with different cement contents were adopted in the tests, and the confining pressure was controlled in the range of 100–1600 kPa. The influence of curing time, cemented soil mixture ratio and confining pressure on the compressive and shear capacity of cemented soil was analyzed based on the test results. The test results indicate that the cement content and curing time both had a great influence on the strength of cemented soil, the UCS of the cemented soil increased linearly with the curing time under the semi-logarithmic coordinate, the cemented soil exhibited strain softening characteristics in the axial shear tests, and the maximum deviatoric stress of the cemented soil increased with the increase in confining pressure. A linear correlation was found between the cohesion and the UCS of cemented soil, and the cohesion was about 0.40 times the compressive strength. Full article
(This article belongs to the Special Issue Key Technologies for Urban Underground Space Development in Coastal Soft Soil Areas)
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13 pages, 22438 KiB  
Article
Dynamic Characteristics of Reconstituted Silt Influenced by Axial Unloading Intensity and Fine Particle Content
by Fanli Meng, Changqing Xia, Min Zhu, Zhijun Tong and Chengyuan Lu
Appl. Sci. 2022, 12(14), 7222; https://doi.org/10.3390/app12147222 - 18 Jul 2022
Viewed by 1228
Abstract
The stress disturbance induced by adjacent construction has a significant impact on the dynamic characteristics of the soil, resulting in complex long-term tunnel settlement under train vibration load. Through a series of dynamic triaxial tests, the effects of different fine particle contents and [...] Read more.
The stress disturbance induced by adjacent construction has a significant impact on the dynamic characteristics of the soil, resulting in complex long-term tunnel settlement under train vibration load. Through a series of dynamic triaxial tests, the effects of different fine particle contents and axial unloading intensities on the permanent axial deformation and excess pore water pressure of reconstituted silt under long-term cyclic loading were investigated. The findings show that as fine particle content in the silt increases, the threshold dynamic stress and failure cycle number decrease at first, then increase, reaching a minimum value at 10% fine particle content. The dynamic characteristics of silt are significantly affected by axial unloading, and the dynamic stress threshold amplitude of a soil sample decreases as the unloading strength increases. The accumulation of silt deformation caused by long-term cyclic load can be effectively controlled by ensuring drainage conditions. Full article
(This article belongs to the Special Issue Key Technologies for Urban Underground Space Development in Coastal Soft Soil Areas)
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14 pages, 3080 KiB  
Article
Influence of Lateral Multistage Unloading Intensity on Mechanical Properties of Reconstituted Coastal Soils Containing Silty Particles
by Changqing Xia, Fanli Meng, Min Zhu, Yan Tang and Chengyuan Lu
Appl. Sci. 2022, 12(7), 3651; https://doi.org/10.3390/app12073651 - 5 Apr 2022
Cited by 1 | Viewed by 1614
Abstract
The unclear understanding of the mechanical behavior of soil under unloading conditions is a significant reason for the frequent occurrence of accidents and difficulties in the deformation control of foundation pit engineering in coastal areas. This paper discusses the effect of multistage unloading [...] Read more.
The unclear understanding of the mechanical behavior of soil under unloading conditions is a significant reason for the frequent occurrence of accidents and difficulties in the deformation control of foundation pit engineering in coastal areas. This paper discusses the effect of multistage unloading intensity on the mechanical properties of reconstituted coastal soils containing silty particles through a series of laboratory tests, namely, the CU triaxial, bender-element, and permeability tests. Results indicate that, with an increase in unloading intensity, the shear strength and stiffness parameters decrease, while permeability slightly increases. The effect of unloading intensity on the mechanical properties of silt and mucky silty clay is more pronounced. Additional consideration should be given to the effect of a single excavation depth on the mechanical properties of fine-grained soil in foundation pit engineering in order to ensure the stability of the surrounding soil and the safety of adjacent structures. Full article
(This article belongs to the Special Issue Key Technologies for Urban Underground Space Development in Coastal Soft Soil Areas)
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