An investigation of the excavation damaged zone at the KAERI underground research tunnel

Kwon, Saeha; Cs, Lee; Cho, S.J.; Jeon, Seokwon; Cho, W.J.

doi:10.1016/j.tust.2008.01.004

Cited by 143 publications

(48 citation statements)

References 8 publications

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“…It was constructed to obtain detailed information on deep geologic environments and to demonstrate the performance of the Korean Reference System for HLW disposal under a repository-relevant condition in Korea. KURT is a small-scale underground research laboratory with one access tunnel (180 m in length) and two research modules (45 m and 30 m in length for the right and left modules) at a depth of 100 m from the surface [23,24]. The rock type is two-mica granite; it is classified as calcalkali rock [25].…”

Section: Kurt Groundwatermentioning

confidence: 99%

Effect of Carbonate on the Solubility of Neptunium in Natural Granitic Groundwater

Kim¹,

Oh²,

Baik³

et al. 2010

Nuclear Engineering and Technology

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Section: Kurt Groundwatermentioning

confidence: 99%

Effect of Carbonate on the Solubility of Neptunium in Natural Granitic Groundwater

Kim¹,

Oh²,

Baik³

et al. 2010

Nuclear Engineering and Technology

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“…Kwon et al (2009) investigated the feature of the excavation damaged zone around a tunnel in Korea through using in-site and laboratory tests. With the help of two-dimensional Boundary Element Method, the stress and displacements distributions around an entry roadway was numerically simulated by Islam and Shinjo (2009).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Characterisation of mechanics and flow fields around in-seam methane gas drainage borehole for preventing ventilation air leakage: A case study

Zheng

Chen

Kizil

et al. 2016

International Journal of Coal Geology

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Coal Mine Methane (CMM) drainage via adopting in-seam horizontal boreholes is an effective way to decrease ventilation cost and production delay, ensure mining safety, reduce greenhouse gas emissions and increase the supply of energy resource.Ventilation air leakage into borehole, however, occurs frequently, which decreases the methane-drainage efficiency. Despite extensive anti-leakage method investigations, a very few studies have been focused on spraying air-proof materials on the roadway rib and optimizing borehole sealing along the borehole, along with taking the effects of sequential excavations of roadway and borehole into account. In this paper, based on data of a real coal mine, a fully coupled mathematical model was developed by incorporating coal permeability with coal mechanical properties and gas adsorption/desorption and was then implemented into a Finite Element software. This numerical simulation was used to analyse transient stress and dynamic air-leakage flow fields around the drainage borehole. Simulation results indicate that: (1) Four stress areas (І to IV) exist around the roadway based on different relief status of the tri-axial stress, and stress distributions around the borehole in those four areas are different from each other; (2) Based on different air-leakage degrees, on the roadway rib, there are four air-leakage levels around borehole. Meanwhile, there are four leakage areas along the borehole: FAA, SAA, HAA and VAA, and the optimal sealing length should be over 17m (exceeding HAA) to prevent air leakage. Air-leakage results in (2) are verified mutually with the mechanics outcomes in (1). Meanwhile, real data obtained from field experiments is introduced to validate the simulation results. All those outcomes can allow for the optimal design of the spraying area and order and borehole sealing, thus provide scientific basis for an integrated anti-air-leakage method including spraying air-proof materials on the roadway wall and sealing borehole effectively, to prevent ventilation air leakage and maximize methane drainage performance.

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“…When tunnels are excavated under the high-stress condition, an unwanted excavation disturbed or damaged zone (EDZ) is induced in surrounding rock masses of the tunnels. The presence of the EDZ around an excavation perimeter significantly affects mechanical, hydraulic, and thermal characteristics of the rock masses and overall performance of the underground space (Kwon et al 2009). Because of this, investigating characteristics and behaviour of the EDZ is essential for underground facilities that require a long-term stability.…”

Section: List Of Symbolsmentioning

confidence: 99%

“…In regard to the blast-induced damage, the practical interest for engineers is determining the extent of the cracks beyond the desired perimeter of tunnels. During excavation of deep-buried tunnels by drill and blast, to adopt an optimized blasting scheme to minimize the blasting disturbances to the surrounding rock masses, seismic velocity monitoring, scanning electron microscope observation, acoustic emission and borehole camera are now widely used in situ after excavation to investigate the blasting damage characteristics such as its initiation threshold, extent and mechanical properties (Falls and Young 1998;Kwon et al 2009;Wassermann et al 2011). In fact, the blast-induced damage overlaps and interacts with the stress redistribution-induced damage in remaining rock masses.…”

Section: List Of Symbolsmentioning

confidence: 99%

Numerical Simulation of Rock Mass Damage Evolution During Deep-Buried Tunnel Excavation by Drill and Blast

Yang

et al. 2014

Rock Mech Rock Eng

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Presence of an excavation damage zone (EDZ) around a tunnel perimeter is of significant concern with regard to safety, stability, costs and overall performance of the tunnel. For deep-buried tunnel excavation by drill and blast, it is generally accepted that a combination of effects of stress redistribution and blasting is mainly responsible for development of the EDZ. However, few open literatures can be found to use numerical methods to investigate the behavior of rock damage induced by the combined effects, and it is still far from full understanding how, when and to what degree the blasting affects the behavior of the EDZ during excavation. By implementing a statistical damage evolution law based on stress criterion into the commercial software LS-DYNA through its user-subroutines, this paper presents a 3D numerical simulation of the rock damage evolution of a deep-buried tunnel excavation, with a special emphasis on the combined effects of the stress redistribution of surrounding rock masses and the blasting-induced damage. Influence of repeated blast loadings on the damage extension for practical millisecond delay blasting is investigated in the present analysis. Accompanying explosive detonation and secession of rock fragments from their initial locations, in situ stress in the immediate vicinity of the excavation face is suddenly released. The transient characteristics of the in situ stress release and induced dynamic responses in the surrounding rock masses are also highlighted. From the simulation results, some instructive conclusions are drawn with respect to the rock damage mechanism and evolution during deep-buried tunnel excavation by drill and blast.

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An investigation of the excavation damaged zone at the KAERI underground research tunnel

Cited by 143 publications

References 8 publications

Effect of Carbonate on the Solubility of Neptunium in Natural Granitic Groundwater

Effect of Carbonate on the Solubility of Neptunium in Natural Granitic Groundwater

Characterisation of mechanics and flow fields around in-seam methane gas drainage borehole for preventing ventilation air leakage: A case study

Numerical Simulation of Rock Mass Damage Evolution During Deep-Buried Tunnel Excavation by Drill and Blast

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