Tunnelling and Underground Space Technology

Items from 1 to 10 out of 10 results

article

Determination of instantaneous breaking rate by Geological Strength Index, Block Punch Index and power of impact hammer for various rock mass conditions

C.O. Aksoy, V. Ozacar, N. Demirel, S.C. Ozer, more

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > 534-540

In mining and construction industries, selection of appropriate excavation method and equipment significantly affects the project feasibility. In the selection, the most important parameters are the geomechanical properties of the rock mass in the excavation route as extensively reviewed in literature. The most widely used geomechanical parameter is uniaxial compressive strength (UCS). However, UCS...

article

Effectiveness of downward evacuation in a large-scale subway fire using Fire Dynamics Simulator

Manabu Tsukahara, Yusuke Koshiba, Hideo Ohtani

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > 573-581

Effective evacuation routes in the case of a large-scale subway fire were studied. A serious problem in the subway fire is that the directions of smoke flow are coincident with those of evacuation toward the surface. Hence, it is necessary to design an evacuation route without interference from smoke. A disastrous fire broke out in the Jungangno subway station in Daegu, South Korea in 2003. Based...

article

An equivalent beam model for the analysis of tunnel-building interaction

M. Maleki, H. Sereshteh, M. Mousivand, M. Bayat

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > 524-533

The aim of this work is to study the effect of structural characteristics, including stiffness, geometry and weight on tunnel–adjacent structure interaction. Ground materials, tunnel geometry and excavator device are related to a part of metro tunnel of Tehran. To describe the ground behavior due to tunneling, a 3D FE code with an elastoplastic soil model was used. The adjacent building was modeled...

article

Influence of geometric factors on the punching load resistance of early-age fibre reinforced shotcrete linings

Erik Stefan Bernard

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > 541-547

Understanding the early-age properties of fibre reinforced shotcrete (FRS) is critical to the accurate estimation of the time to safe re-entry under freshly sprayed FRS linings. Previous research in the field has indicated that shear failures dominate early-age load resistance and thereby govern the performance of a lining during the first few hours after spraying. This investigation has examined...

article

Convergence-confinement approach for designing tunnel face reinforcement by horizontal bolting

Daniel Dias

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > 517-523

The ground reinforcement by bolting is a technique in strong development. Bringing a perennial supplement of resistance to the ground, this technique permits to use poor grounds in a sensitive environment. It can be particularly, used for the reinforcement of tunnel faces.The full numerical simulation of such works remains a heavy and expensive process, notably in terms of geometrical complexity and...

article

Influence of micromolecular structure on environmental stress cracking resistance of high density polyethylene

Joy J. Cheng, Maria A. Polak, Alexander Penlidis

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > 582-593

Environmental stress cracking (ESC) is a serious problem for polyethylene (PE) in structural applications and can result in catastrophic failure without any visible warning. Due to the nature of polymeric materials, polyethylene with excellent short-term mechanical strength can have poor long-term performance due to environmental stress cracking. In this work, we present our recent research findings...

article

Editorial Board

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > IFC

article

Numerical simulation of TBM construction ventilation in a long diversion tunnel

Xiaoling Wang, Ziqiang Zhang, Zhengyin Zhou, Hongchao Chen

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > 560-572

A three-dimensional Renormalization-group (RNG) k–ε model has been performed for forced ventilation to the working face of a long diversion tunnel, taking into account the effects of air leakage and the frictional resistance along the tunnel. The case study involves the working face during TBM construction of the Xinjiang 81 Daban long diversion tunnel, China. Analysis of the flow-field distribution...

article

Filtration and penetrability of cement-based grout: Study performed with a short slot

Almir Draganović, Håkan Stille

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > 548-559

Filtration of cement-based grout during penetration through fractures in rock is an important issue while sealing the rock around tunnels. Whether a type of grout could be designed to penetrate a fracture of a certain aperture without filtration is an interesting question that needs to be further investigated. This study examines the question of whether grout penetration can be measured using our...

article

Evaluation of impending collapse in circular tunnels by analytical and numerical approaches

M. Fraldi, F. Guarracino

Tunnelling and Underground Space Technology incorporating Trenchless Technology... > 2011 > 26 > 4 > 507-516

On the basis of a straightforward analytical approach which has been recently proposed by the present authors, a comparison with numerical procedures to predict plastic collapse in circular rock tunnels is reported. In fact, numerical modeling of the evolution of progressive failure leading to collapse in tunnels is a quite complicated matter and requires great care in modeling the problem and interpretating...

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Number:
4
Volume:
26
Year:
2011

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Keywords

NUMERICAL MODELING (2)
A LONG DIVERSION TUNNEL (1)
ADJACENT STRUCTURE (1)
AIR LEAKAGE RATE PER 100M (1)
BLOCK PUNCH INDEX (1)
BOLTING (1)
CHAIN ENTANGLEMENTS (1)
CIRCULAR TUNNELS (1)
EARLY AGE (1)
ENVIRONMENTAL STRESS CRACKING RESISTANCE (1)
EVACUATION DIRECTION (1)
FIBRE REINFORCED SHOTCRETE (1)
FILTRATION (1)
FIRE DYNAMICS SIMULATOR (1)
FORCED VENTILATION (1)
GROUND CONTROL (1)
GROUND MOVEMENT (1)
GROUT (1)
HIGH DENSITY POLYETHYLENE (1)
IMPACT HAMMER (1)
IMPENDING COLLAPSE (1)
INSTANTANEOUS BREAKING RATE (1)
INTER-LAMELLAR LINKS (1)
LIMIT ANALYSIS (1)
LOAD RESISTANCE (1)
MEASUREMENTS (1)
NUMERICAL ANALYSIS (1)
PENETRABILITY (1)
PHASE INTER-CONNECTIVITY (1)
PLASTICITY (1)
POLYMER NETWORK MOBILITY (1)
PUNCHING SHEAR (1)
REINFORCEMENT (1)
ROCK EXCAVABILITY (1)
ROCK MASS PROPERTIES (1)
SHALLOW TUNNEL (1)
SHORT SLOT (1)
SMOKE BEHAVIOR (1)
SOFT GROUND TUNNELING (1)
SUBWAY FIRE (1)
TBM CONSTRUCTION (1)
TENSILE STRAIN HARDENING (1)
TESTING (1)
THREE-DIMENSIONAL RNG K–Ε MODEL (1)
TOXIC GAS (1)
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