A simplified excavation chamber pressure model for EPBM tunneling
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TLDR
A simplified excavation chamber pressure model for earth pressure balance shield tunnel boring machine (EPBM) tunneling in granular soils, capable of predicting chamber pressure response during both excavation and standstill periods, is presented in this paper.About:
This article is published in Tunnelling and Underground Space Technology.The article was published on 2020-09-01 and is currently open access. It has received 10 citations till now. The article focuses on the topics: Chamber pressure & Earth pressure balance.read more
Citations
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Dynamic prediction of mechanized shield tunneling performance
TL;DR: A dynamic regulation model is established based on wavelet transform and bidirectional long short-term memory method (Bi-LSTM) to predict advance speed and torque to validate the Sutong gas-insulated transmission line project in China with a complex underwater-work condition.
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Enhancing earth pressure balance tunnel boring machine performance with support vector regression and particle swarm optimization
TL;DR: In this paper , the authors combined data-driven modeling and optimal control for performance enhancement of earth pressure balance tunnel boring machine (EPBM), and two coupled processes, EPBM advance rate and cutterhead rotation torque, are modeled using support vector regression (SVR).
Journal ArticleDOI
Quantification of Stratigraphic Transition Location Uncertainty for Tunneling Projects
TL;DR: In this paper , a geostatistical modeling-based probabilistic approach is presented to quantify the stratigraphic transition location uncertainty in the longitudinal direction of tunneling and at the tunnel face.
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Upper bound analysis of longitudinally inclined EPB shield tunnel face stability in dense sand strata
TL;DR: Based on the numerical results of soil failure pattern in front of tunnel face, a novel two-dimensional (2D) failure mechanism is conceived following the upper bound theorem in this article , where the failure zone consists of an upper loosen zone, an arc-shaped shear band, and a triangular rigid body, which can calculate the active limit face support pressure.
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Modelling the infiltration behavior of foam into saturated sand considering capillary resistance for EPB shield tunneling
TL;DR: In this article , a micro stability model is established to predict the maximum foam penetration depth that is based on the minimum pressure difference over an individual foam bubble through the pore throats.
References
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The strength and dilatancy of sands
TL;DR: In this paper, the strength and dilatancy of 17 sands in axisymmetric or plane strain at different densities and confining pressures are collated, and the critical state angle of shearing resistance of soil which is shearing at constant volume is determined experimentally within a margin of about 1°, being roughly 33° for quartz and 40° for feldspar.
Journal ArticleDOI
Simulation-based learning: just like the real thing.
TL;DR: Simulation-based learning can be the way to develop health professionals’ knowledge, skills, and attitudes, whilst protecting patients from unnecessary risks, in order to mitigate ethical tensions and resolve practical dilemmas.
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A brief history of the development of mannequin simulators for clinical education and training
TL;DR: The development of mannequin simulators used for education, training, and research is reviewed, tracing the motivations, evolution to commercial availability, and efforts toward assessment of efficacy of those for teaching cardiopulmonary resuscitation, cardiology skills, anaesthesia clinical skills, and crisis management.
Book
Mechanised Shield Tunnelling
TL;DR: In this article, the development potential of the mechanised shield tunnelling method is far greater than that of the shotcrete method and other traditional tunnel construction because it is a safer, more effective method of tunnel construction.
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Characterizing the influence of stress on foam conditioned sand for EPB tunneling
TL;DR: In this paper, the authors examined the effect of total stress, effective stress, and key soil parameter void ratio on the behavior of foam-conditioned soil under applied total pressures of up to 5 bar.
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