Many studies have investigated tunnel face failure using the discrete element method (DEM). However, DEM simulations that incorporate water-soil interactions in tunnel face failure are still limited. In this study, the coupled CFD-DEM method is employed to simulate the progressive failure of the shield tunnel face in both saturated and dry sand. The dynamic mesh method is applied in the CFD component to accurately simulate the changes in the CFD domain due to the movement of the tunnel face. The excavation face is moved forward or backward at a uniform rate to simulate passive and active failure, respectively. The analysis focuses on progressive failure, ground surface displacement, tunnel face support forces, force chain distribution, and vertical stress distribution. Our results at both macro- and micro-scales reveal significant effects of soil-water interactions.
Download full-text PDF |
Source |
|---|---|
| http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0319184 | PLOS |
Publication Analysis
Top Keywords
Similar Publications
Quantification of extrusion-induced excavation volume in shield tunnelling through squeezing cohesive-frictional ground.
Sci Rep
March 2025
ETH Zurich, Zurich, Switzerland.
When tunnelling through weak and highly deformable ground, relevant deformations occur ahead of the tunnel face and result in face displacements that are opposite to the advance direction ("extrusion"). In mechanised tunnelling, the cutterhead continuously removes the ground extruding at the tunnel face during advance. Therefore, the total excavation volume is higher than the volume that corresponds to the tunnel cross-section area.
View Article and Find Full Text PDFCoupled CFD-DEM simulation of progressive failure of tunnel face in sand.
PLoS One
March 2025
College of Civil Engineering and Architecture, Xinjiang University, Urumqi, China.
Many studies have investigated tunnel face failure using the discrete element method (DEM). However, DEM simulations that incorporate water-soil interactions in tunnel face failure are still limited. In this study, the coupled CFD-DEM method is employed to simulate the progressive failure of the shield tunnel face in both saturated and dry sand.
View Article and Find Full Text PDFTunneling-barrier-controlled sensitive deep ultraviolet photodetectors based on van der Waals heterostructures.
Nat Commun
March 2025
State Key Laboratory of Photovoltaic Science and Technology, Shanghai Frontiers Science Research Base of Intelligent Optoelectronic and Perception, Institute of Optoelectronic and Department of Materials Science, Fudan University, Shanghai, China.
Deep ultraviolet (DUV) photodetection usually relies on wide-bandgap semiconductors, which however face challenges in material growth and doping processes. In this work, we proposed and validated a photodetection scheme based on tunneling barrier modulation, achieving highly sensitive DUV photodetection. Using a two-dimensional van der Waals heterostructure, the device integrates MoS as the transporting layer for its high carrier mobility and low dark current, few-layered graphene (FLG) as the photon absorption layer, and hexagonal boron nitride (hBN) as the dielectric barrier.
View Article and Find Full Text PDFDynamic numerical simulation analysis of rockburst grade evaluation based on rock mass strength.
Sci Rep
March 2025
School of Architectural Engineering, Xuchang Vocational Technical College, Xuchang, 461000, China.
The occurrence of rockbursts is closely related to the stress environment and structural characteristics of rock mass. The Lalin Railway Tunnel in China was taken as a case study, a modified method for evaluating rockburst grades was proposed based on the ratio of rock mass strength to maximum tangential stress at the tunnel wall, and the accuracy of this method was also validated. Furthermore, a three-dimensional numerical model of tunnel excavation was established using FLAC (three-dimensional fast lagrangian analysis of continua).
View Article and Find Full Text PDFCentral vein stenosis- prevalence, clinical characteristics, outcome and its impact on dialysis access.
J Artif Organs
February 2025
Department of Nephrology, Saveetha Medical College and Hospital, Saveetha Institute of Medical and Technical Sciences, Chennai, Tamil Nadu, India.
Central vein stenosis (CVS) is a complication primarily affecting chronic hemodialysis patients, frequently resulting in vascular access dysfunction and decreased dialysis efficacy. While CVS has a variable mortality rate, its impact on dialysis access is profound, including arm edema, facial swelling, and venous hypertension. We describe the prevalence, clinical presentation, and treatment outcomes of CVS for vascular access in hemodialysis patients.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!