Article
Construction & Building Technology
Panpan Guo, Xiaonan Gong, Yixian Wang, Hang Lin, Yanlin Zhao
Summary: This paper investigates the estimation of minimum cover depth of underwater shield tunnels by reviewing and validating five different conventional methods. The study concludes that the Japanese minimum seepage water volume method and the mechanical equilibrium method are effective for determining the reasonable minimum cover depth. A new procedure combining appropriate conventional methods and numerical analysis is proposed to estimate the minimum cover depth.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Construction & Building Technology
Ahmed Elgamal, Nissreen Elfaris
Summary: Underwater tunnel structures in urban areas are of increasing importance, and assessments must be conducted from geotechnical and structural engineering perspectives. This study focuses on the stability of a tunnel crossing the River Nile, emphasizing the need for safety factors of at least 1.5 in construction and service stages and 1.3 in exceptional cases of scour.
Article
Engineering, Geological
Weixin Sun, Fucheng Han, Hanlong Liu, Wengang Zhang, Yanmei Zhang, Weijia Su, Songlin Liu
Summary: With the development of urbanization, the utilization of underground space for civil purposes becomes more critical. This paper investigates the minimum soil overburden depth of shield tunnels and proposes a method to determine the burial depth of rectangular shield tunnels. The findings provide valuable insights for the design and construction of shield tunnels in urban underground space exploitation.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Hanyuan Li, Xinggao Li, Yi Yang, Yang Liu, Mingzhe Ma
Summary: This study focuses on the mechanical response of segmental tunnels crossing fault fracture zones. The results show that the location of damage and deformation in the tunnel structure differs between normal and reverse fault dislocation. The soil elastic modulus and the vertical distance between the fault and tunnel play a significant role in structural damage, bolt stress, and joint deformation. The fault dip angle does not affect the mechanical characteristics of the tunnel structure in normal faulting cases but can transform the failure mode in reverse faulting cases.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Xuyan Tan, Weizhong Chen, Jianping Yang, Bowen Du, Tao Zou
Summary: Predicting future mechanical behaviors of tunnel structure is crucial for disaster prevention and long-term stability maintenance. A multi-learning model called GC-GRU was proposed in this study, based on deep learning algorithm and structural health monitoring data from Wuhan Yangtze River tunnel, to accurately predict future mechanical behaviors.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Construction & Building Technology
Kun Liang, Kun Feng, Li Zhang, Chuan He, Ang Su, Wenqi Guo
Summary: This study proposes a plastic hinge-based approach to investigate the failure mechanism of underwater shield tunnel lining structures. The study conducted full-scale tests on two types of shield tunnel lining structures: straight-joint assembly structure (STRJS) and staggered joint assembly structure (STGJS), and compared their failure mechanisms using the plastic hinge approach. The results showed that the assembly method significantly affected the failure pattern, and STRJS and STGJS failed through longitudinal joints and concrete segments, respectively. It highlights the importance of considering the assembly method and the type of plastic hinge in the design of underwater shield tunnel lining structures.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Construction & Building Technology
Qingtao Lin, Dechun Lu, Chunming Lei, Yu Tian, Fanchao Kong, Xiuli Du
Summary: This study conducted a model test of shield under-crossing in cobble strata to analyze the mechanical response of existing tunnels. Through measuring the earth pressure and deformation characteristics, the deformation pattern and weak positions of the existing tunnels were revealed.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Construction & Building Technology
C. Bauduin, A. A. Kirstein
Summary: This paper describes the approach applied to the design, execution, and monitoring of the existing tunnel in the framework of improving traffic around Amsterdam. It focuses on the analysis and mitigation of main design and construction risks, as well as the monitoring system and threshold values applied.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Engineering, Geological
Hong Wu, Zhi Ye, Yuting Zhang, Hongqing Liu, Huabei Liu
Summary: This study investigates the seismic response of a shield tunnel passing through saturated sand deposits with different relative densities. The Dafalias and Manzari model is used to capture the cyclic behavior of liquefiable soil under earthquake excitation. A refined lining model is proposed to simulate the mechanical behavior of segment joints. A fully fluid-solid coupled analysis is performed to investigate the seismic response of shield tunnels crossing through adjacent sand deposits with different relative densities. The displacement of segment joints and internal force of lining concrete are found to be prominent near the interface. The structure deformation mode consists of the opening, dislocation, and distortion of ring joints. The complicated tunnel deformation mechanism is clarified. Comprehensive parametric studies establish quantitative relationships between joint displacement and internal force of segmental linings and normalized parameters. The seismic response of the tunnel structure near the interface is significantly affected by earthquake magnitude and difference in relative densities, in addition to soil-deposit interface inclination and cover to diameter ratio.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Huanzhu Zhou, Shengan Liu, Bin Li, Weiyun Chen, Lei Su, Jun-Jie Zheng, Yewei Zheng
Summary: This paper presents a theoretical model for analyzing the longitudinal seismic response of immersed tunnels connecting artificial islands. The results indicate that the free end conditions can better reflect the boundary conditions of the immersed tunnel, and the flexible joints can reduce shear forces at the interface of different strata.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Green & Sustainable Science & Technology
Yang Shen, Ting Zhang, Hongtao Liu, Jiahui Zhu, Pengyu Yang, Yuke Wang
Summary: This paper uses finite element software to analyze the homogeneous leakage model of different soil layers and different degrees of lining deterioration, exploring the leakage law and mechanism of underwater shield tunnels. The study finds that the severity of tunnel seepage is influenced by soil layer properties and lining deterioration. The research results provide insights for understanding and managing tunnel leakage.
Article
Construction & Building Technology
Qingtao Lin, Dechun Lu, Chunming Lei, Yu Tian, Qiuming Gong, Xiuli Du
Summary: A test platform for earth pressure balance shield was designed and manufactured to conduct tests on shield under-crossing existing tunnels in cobble strata. Surface settlement, earth pressure on existing tunnels, and circumferential strain of existing tunnels were measured to reveal collapse mechanism of cobble soil around existing tunnels and deformation features of existing horseshoe and rectangular tunnels.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Construction & Building Technology
Yuxuan Gou, Qiangbing Huang, Xiaosen Kang, Lixin Wang, Xiaoqiang Yang, Hongquan Teng
Summary: The study investigated the internal force, deformation, and failure characteristics of a shield tunnel crossing a ground fissure. The results showed that if the ground fissure dislocated, the shield tunnel exhibited three-dimensional deformation, including axial bending, horizontal torsion, and axial tension-compression. The segments near the ground fissure presented uneven vertical dislocation, horizontal deflection, and axial tilt. Countermeasures and suggestions were proposed to mitigate the adverse impacts of ground fissure on the metro shield tunnel.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Environmental Sciences
Lei Zhu, Qianwen Wu, Yuke Jiang, Zhenyu Li, Yuke Wang
Summary: The effect of temperature on the structural stability of the underwater shield tunnel was studied through numerical simulation. The results showed that the temperature circle expanded rapidly after 50 days of operation, with a diffusion range increase of 256.7%. Higher soil temperatures resulted in more complex temperature transfer and greater temperature stresses, reducing the tunnel's safety. The settlement of the arches increased rapidly initially but decreased gradually with time.
Article
Geochemistry & Geophysics
Yu Liang, Xumin Huang, Shijun Gao, Yihao Yin
Summary: Through multiple groups of physical and mechanical tests, the ratio of grout material was optimized, and specific proportions of water reducing agent and bentonite were found to effectively improve grouting performance. Additionally, the distribution law of grout along the segment ring during the filling stage was studied, with the theoretical calculation of grouting pressure showing good agreement with measured data.
