Aug 02, 2019 · Construction of the Geomechanical Model Construction Procedures. To ensure the integrity and homogeneity of the surrounding rock, the geomechanical model is paved, compacted and air-dried layer by layer (Zhang et al. 2012, 2017a; Wang et al. 2017). The detailed procedures are as follows.
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Underground excavations produce damaged zones surrounding the excavations which have disturbed hydrologic and geomechanical properties. Prediction of fluid flow in these zones must consider both the mechanical and fluid flow processes. Presented here is a methodology which utilizes a mechanical model to predict damage and dis-
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Excavation of galleries, tunnels, and shafts in a waste repository inevitably causes disturbance and shifting of nearby host rock as the rock readjusts to the altered local stress regime. The properties of this excavation damaged zone (EDZ) around tunnels have become increasingly important to the performance assessment of nuclear waste
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Roadway slope stability assessment in mudstone layers of Sochi (Russia) K. Kang, O.V. Zerkal, S. Huang & A.A. Ponomarev. Searching for indicators of excavation damage using R statistics environment R. Kiuru, P. Kantia & M. Rinne. Estimation of coal cutting force based on the impact of geomechanical factors S. Kostić, J. Trivan & N. Gojković
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In the present study, a coupled numerical method is used to study EDZ (excavation damage zone) in a deep schist tunnel. Two codes, Fast Lagrangian Analysis of Continua (FLAC) and Particle Flow Code (PFC) are coupled to implement the simulation. The motive to apply the FLAC/PFC coupled approach is to take advantage of each modeling scheme while at the same time …
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Assessment of excavation damaged zone using a micromechanics model. It is well known that acoustic emission (AE) and microseismic (MS) events are indicators of rock fracturing or damage as the rock is brought to failure at high stress. By capturing the microseismic events, underground excavation induced rock mass degradation or damage can be
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Abstract: In the present study, a coupled numerical method is used to study EDZ (excavation damage zone) in a deep schist tunnel. Two codes, Fast Lagrangian Analysis of Continua (FLAC) and Particle Flow Code (PFC) are coupled to implement the simulation. The motive to apply the FLAC/PFC coupled approach is to take advantage of each modeling scheme while at the same …
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Feb 16, 2014 · Choosing a suitable method for the assessment of excavation damage zone (EDZ) is very important in the economy, stability, and safety because the EDZ affects the behavior of rock mass surrounding the underground spaces, which reduces the stability and safety factor of the underground structure. In this study, the fuzzy analytical hierarchy process was used to …
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assessment, initiated by CNSC, Canada. xTask B: The Excavation Disturbed Zone (EDZ). MHC studies of the EDZ, initiated by SKB, Sweden. xTask C: Excavation Damaged Zone (EDZ) in the argillaceous Tournemire site, France, initiated by IRSN, France. xTask D: Permanent permeability/porosity changes due to THC and THM
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Positive distance is within the excavated zone and negative distance is in the unexcavated zone of the tunnel profile. (Oke et al. 2014). assessment of input excavation damage in
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The blast‐induced damage zone has been largely defined in terms of its extent and lacks a definition based on its inherent competency parameters, which are directly related to the stability of an excavation. The blast‐induced damage zone …
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Jul 13, 2021 · An excavation damaged zone (EDZ) in the Opalinus Clay of the Mont Terri rock laboratory, Switzerland, was characterized with regard to hydraulic and mechanical properties using three different methodological on-site approaches: (1) air permeameter, (2) microscope camera and (3) needle penetration test.
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This paper presents a study on the quantification of the degree of damage from the microseismic event data, for assessment of excavation damaged zone of anisotropic rock in Jinchuan mine and presents numerical simulation and prediction on the deformation and failure of the rock masses surrounding laneway under rock mass properties and excavating conditions.
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Geomechanica Inc. | 2,684 followers on LinkedIn. INNOVATION THROUGH SIMULATION | Geomechanica develops simulation software and provides consulting and laboratory testing services for rock engineering applications. These applications include hydraulic fracturing, assessment of excavation damaged zone around underground openings, rock slope and dam …
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Sep 23, 2012 · In this paper, we investigate the influence of the excavation damaged zone (EDZ) on the geomechanical performance of compressed air energy storage (CAES) in lined rock caverns. We conducted a detailed characterization of the EDZ in rock caverns that have been excavated for a Korean pilot test program on CAES in (concrete) lined rock caverns at shallow …
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The creation of an excavation disturbed zone or excavation damaged zone is expected around all man-made openings in geologic formations. Macro- and micro-fracturing, and in general a redistribution of in situ stresses and rearrangement of rock structures, will occur in this zone, resulting in drastic changes
Get a QuoteDOI: 10.1016/J.IJRMMS.2013.11.002 Corpus ID: 128967219. Fracture characterization around a gallery in soft sedimentary rock in Horonobe URL of Japan @article{Tokiwa2014FractureCA, title={Fracture characterization around a gallery in soft sedimentary rock in Horonobe URL of Japan}, author={T. Tokiwa and K. Tsusaka and M. Matsubara and T. Ishikawa}, …
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Excavation damage zone cut-off dimension assessment using continuum mechanics. In Proceedings of Eurock & 64th Geomechanicas Colloquium, Salzburg, Austria. Perras, MA., and Diederichs, MS. 2015. Observations and numerical back analysis of an excavation in the Queenston mudstone. ISRM Congress - Shale Symposium, Montreal, Canada.
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Jul 04, 2020 · Excavation damaged zones (EDZs) in deeply buried underground powerhouse have become major obstacles to design and support, which potentially threaten safety and stability and increase construction and support costs. In this study, investigations of the EDZs were performed by applying an acoustic velocity detecting method in Houziyan hydropower project, southwest …
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Jan 01, 2005 · The creation of an excavation disturbed zone (EdZ) or excavation damaged zone (EDZ) is expected around all man-made openings in geologic formations. Macro- and micro-fracturing, and in general a redistribution of in situ stresses and rearrangement of rock structures, will occur in this zone, resulting in drastic changes of permeability to flow, mainly through the …
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