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Article
Engineering, Civil
Chao Liu et al.
Summary: This paper investigates the development of crack and damage in shield tunnel lining under seismic loading. Based on a recently constructed undersea-shield tunnel, a series of refined 3D Finite Element models are created and validated. The simulation results show that damage tends to occur at the crown and bottom of the tunnel lining, and the segment assembling type has significant influence on the damage development.
THIN-WALLED STRUCTURES
(2023)
Article
Construction & Building Technology
Gang Zheng et al.
Summary: This study investigates the response of piled buildings to shield tunnelling in soft ground, showing that the position of the tunnel relative to the pile foundation significantly affects building settlement. Two different settlement patterns are observed: when the tunnel is excavated below the pile foundation, settlement is mainly caused by unloading in the soil above the tunnel crown; when the tunnel is excavated on the side of the pile foundation, settlement is mainly caused by compressing the pile-tip soil.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Geological
Zhiwei Zhang et al.
Summary: This paper presents a new analytical solution for evaluating the longitudinal deformation of shield tunnel in overcrossing tunnelling, taking into consideration circumferential joints. A simplified longitudinal beam-spring model is established to accurately model the longitudinal behavior of the tunnel, considering the opening and dislocation between segmental rings. The proposed method is verified through various cases and compared with other analytical methods, demonstrating its effectiveness in capturing tunnel segmental ring and joint deformation.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Dong Su et al.
Summary: This paper investigates the failure mechanism of tunnel faces in reinforced soft soil through finite-element analysis, focusing on the influence of the distance between the tunnel face and the cement wall. The limit support pressure and failure zone of the soil in front of the tunnel face are determined for different values of the face-wall distance. Three types of failure modes are identified based on the shear strain development, and analytical expressions for calculating the limit support pressure are derived. The proposed collapse models accurately reflect the impact of the face-wall distance on the stability of tunnel faces in soft clay reinforced with soil-cement wall.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Mechanical
Rujia Li et al.
Summary: In this paper, a self-designed test device was used to investigate sand erosion and void development induced by shield-tunnel joint leakage. The experimental results show that sand erosion has obvious temporal and spatial evolution characteristics. It can be divided into four stages in the temporal dimension and three regions in the spatial dimension. The erosion zone can be described by a rotating ellipsoid, and its scope increases with increasing water head.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Geological
Zhenyun Zhao et al.
Summary: This paper investigates the damage pattern of the concrete lining in a large-diameter subsea shield tunnel under different seismic loading intensities. A refined finite element (FE) model is established to study the influence on lining segments and joint openings. The results show that the damage to the segment is mainly concentrated in certain areas, the moment of damage development is related to the seismic time history, and the area and level of lining damage increase with the earthquake intensity.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Construction & Building Technology
Kun Liang et al.
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
Zhang Xiaohui et al.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Construction & Building Technology
Jin-Zhang Zhang et al.
Summary: This paper investigates the coupling effect of loading and unloading on shield tunnels through physical model tests. The results show that the response of the tunnel lining is significantly amplified under coupling conditions. A coupling effect index is proposed to evaluate the degree of coupling under different disturbances, and it is classified into favorable, zero, and unfavorable coupling effects. The tunnel response has a more significant coupling effect when loading occurs before unloading.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Construction & Building Technology
Gang Wei et al.
Summary: In order to investigate the internal force and deformation response of the Hangzhou subway shield segment during the excavation and unloading of the side foundation pit, full-scale loading tests were conducted using a self-developed hydraulic loading system. The internal force and deformation of the segment structure were analyzed considering factors such as the foundation pit and tunnel clear distance. A numerical model was established to analyze parameters that were difficult to obtain in experiments, such as the tunnel depth. The results showed that the equal load maintained the segment in a balanced state, with large internal forces and deformations. The maximum positive and negative bending moment increased after the excavation, while the maximum axial force decreased. The numerical model proved effective in analyzing the stress state of the tunnel.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Construction & Building Technology
Wenqi Guo et al.
Summary: This study investigates the effect of internal structure and longitudinal force on the longitudinal mechanical properties of road-metro shield tunnels through a series of physical similar model tests. The results show that the internal structure can greatly reduce the longitudinal deformation of the tunnel and improve its bending stiffness efficiency.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Civil
Fei Gao et al.
Summary: Shield tunnelling in sensitive soil causes disturbance to the surrounding soil, which leads to soil structure damage and reduction in soil strength. This study conducted in-situ measurements to determine the extent of soil disturbance and its distribution caused by shield tunnelling. The effect of advancing speed on soil disturbance was also analyzed. The findings provide guidance for optimizing shield tunnelling and reducing soil disturbance.
TRANSPORTATION GEOTECHNICS
(2023)
Article
Engineering, Civil
Yi Zeng et al.
Summary: This paper presents a case study on the identification and management of geological and environmental risks during the construction of the largest slurry shield tunnel in China. The ground conditions and settlement control were challenging due to mixed ground conditions, fault zones, and tunneling under residential areas and Metro Lines. Novel monitoring systems, ground treatment, and safety management technologies were successfully implemented. A technical framework was proposed as a risk management guidance for similar tunneling operations.
Article
Engineering, Civil
Xu Song et al.
Summary: This study establishes a numerical model and verifies it with field data to investigate the effect of post-tunneling steady seepage on soil arching evolution. The results show that seepage leads to an increase in effective vertical stress and weakens the soil arching effect, reducing the height of the arch zone. Seepage also intensifies ground consolidation settlement while decreasing the differential displacement in the soil mass. The ground reaction curve under steady seepage condition shows higher values compared to after excavation. It is recommended to control the ground loss ratio within the range of 0.5-1.0% to minimize overburden pressure and moderate ground deformation.
Article
Construction & Building Technology
Huai-Na Wu et al.
Summary: This paper investigates the transverse deformation response of shield tunnel lining structures under upper unloading conditions. A sophisticated numerical model is developed to analyze the behavior of segmental rings, and the failure mechanism is studied based on plastic hinge theory. The results show the change in deformation mode and the maximum vertical convergence deformation of the segmental ring. The structural response and failure process under unloading conditions are compared with continuous loading conditions.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Xiaohui Zhang et al.
Summary: An improved XFEM method is proposed in this paper to calculate the cracks of a segment under the effects of an external load and reinforcement corrosion. The study shows that the morphology of the corrosion-induced cracks can be described as multiple connected ellipses, and the load-induced cracks on the surface of the segment affect the span length and angle of the corrosion-induced cracks. With longer corrosion time, the deflection of the segment increases more significantly under certain bending moments.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Civil
Shuo Yu et al.
Summary: This study investigates the influence mechanism of bolt corrosion on the mechanical properties of shield tunnel under DC stray current using numerical and experimental analysis methods. The results show that the effect of bolt corrosion on tunnel deformation and internal force is influenced by the joint assembly and current input mode.
Article
Construction & Building Technology
Shuai Zhao et al.
Summary: This paper presents a deep learning-based approach that extends the PANet model by adding a semantic branch to refine crack evaluation and reduce inaccuracies associated with crack discontinuities and image skeletonization. Experimental results show that the proposed approach outperforms other methods, demonstrating its superiority in mitigating crack disjoint problems and skeletonization error. The evaluation metrics indicate that the proposed model is an alternative approach for crack segmentation and quantification in the field.
AUTOMATION IN CONSTRUCTION
(2021)
Article
Engineering, Mechanical
Jianwen Liu et al.
Summary: This study presents a rational modeling procedure for the damage mechanism and serviceability of shield tunnel under unloading based on damage constitutive model of concrete. The research shows that tension damage dominates while compression damage is minor when shield tunnel suffers unloading stress, causing additional shear force and bending moment. The proposed modeling procedure is competent to capture the shield tunnel responses due to unloading, highlighting areas with severe damage and lowest serviceability that require special attention.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Civil
Hao Jin et al.
INTERNATIONAL JOURNAL OF CIVIL ENGINEERING
(2019)
Article
Construction & Building Technology
Jing Zhang et al.
SUSTAINABLE CITIES AND SOCIETY
(2019)
Article
Construction & Building Technology
Rui Guo et al.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2019)
Article
Multidisciplinary Sciences
Mohamed H. Mussa et al.
Article
Engineering, Civil
Hao Jin et al.
THIN-WALLED STRUCTURES
(2018)
Article
Construction & Building Technology
Mohamed H. Mussa et al.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2017)
Article
Construction & Building Technology
Xian Liu et al.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2017)
Article
Construction & Building Technology
Shi Chenghua et al.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2016)
