Journal ArticleDOI
Discrete Numerical Model for Analysis of Earth Pressure Balance Tunnel Excavation
TLDR
In this article, numerical tools based on a discrete method (particulate materials) have been used to design both tunnels and tunneling machines, and the results from the models are compared with real data.Abstract:
Two extension projects have been carried out recently on the Madrid Metro, including 97 km of large-diameter (9.38 m) tunnels. Some technical specifications for the shields (thrust and torque) needed to excavate the tunnels have been analyzed in this work. The soil stability problem at the tunnel face has also been studied. Numerical tools based on a discrete method (particulate materials) have been used for these purposes. Results from the models are compared with real data and show the promising possibilities of the method to design both tunnels and tunneling machines.read more
Citations
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Journal ArticleDOI
Experimental study on face instability of shield tunnel in sand
TL;DR: In this paper, a series of 3D large-scale model tests with a tunnel of 1m diameter were conducted in dry sand for various cover-to-diameter ratios C / D ǫ = 0, 1, and 2 (ie, relative depth; C is the cover depth and D is the diameter of tunnel) each test provided a measurement of the support pressure and the ground settlement with the advance of face displacement.
Journal ArticleDOI
Face stability analysis of shallow shield tunnels in dry sandy ground using the discrete element method
TL;DR: In this paper, the failure mechanism and limit support pressure of a tunnel face in dry sandy ground were investigated by using discrete element method (DEM), which has particular advantages for revealing mechanical properties of granular materials.
Journal ArticleDOI
Numerical Models in Discontinuous Media: Review of Advances for Rock Mechanics Applications
TL;DR: In this article, the authors present a description of the methods used to model rock as discontinuous media, including the distinct element method, the discontinuous deformation analysis method, and the bonded particle method.
Journal ArticleDOI
Real-time analysis and regulation of EPB shield steering using Random Forest
TL;DR: The results indicate that the predicted settlements show great agreement with the measured settlements and the consistency of the face pressure and grout filling values calculated by the PSO-RF and the grid search method demonstrates the feasibility and applicability of proposed hybrid algorithm.
Journal ArticleDOI
Tunnel face stability in heavily fractured rock masses that follow the Hoek–Brown failure criterion
TL;DR: In this article, an advanced rotational failure mechanism is developed to compute, in the context of limit analysis, the collapse pressure for tunnel faces in fractured rock masses characterized by the Hoek-Brown nonlinear failure criterion.
References
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Journal Article
Discrete numerical model for granular assemblies.
Peter Cundall,Otto D. L. Strack +1 more
TL;DR: The distinct element method as mentioned in this paper is a numerical model capable of describing the mechanical behavior of assemblies of discs and spheres and is based on the use of an explicit numerical scheme in which the interaction of the particles is monitored contact by contact and the motion of the objects modelled particle by particle.
Journal ArticleDOI
A discrete numerical model for granular assemblies
Peter Cundall,Otto D. L. Strack +1 more
TL;DR: The distinct element method as mentioned in this paper is a numerical model capable of describing the mechanical behavior of assemblies of discs and spheres and is based on the use of an explicit numerical scheme in which the interaction of the particles is monitored contact by contact and the motion of the objects modelled particle by particle.
Journal ArticleDOI
Simulation of failure around a circular opening in rock
TL;DR: In this paper, a biaxial compression test was performed on a sandstone specimen with a circular opening to simulate a loading-type failure around an underground excavation in brittle rock.
Journal ArticleDOI
Prediction and analysis of subsidence induced by shield tunnelling in the Madrid Metro extension
TL;DR: The development of tunnelling projects under heavily populated cities has been rapidly increasing around the world during the last decades as mentioned in this paper, since tunnel construction can have disastrous effects on the environment.
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