Study of excavation induced rock damage at the Grimsel

Study of excavation induced rock damage at the Grimsel

How Does In Situ Stress Rotate Within a Fault Zone

host rock, through the damage zone, toward the fault core, while the change of Poisson's ratio shows an opposite trend. Based on these characteristics, a multilayer model was proposed to simulate the stress varia - tions in a strike-slip fault damage zone (Faulkner et al., 2006). In their model, the stress rotations are chiefly

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Predicting excavation damage zone depths in brittle rocks

that the damage caused by the excavation process increases the permeability from the undamaged rock mass and represents a potential contaminate transport or leakage pathway. To date pre-dicting the depth of excavation related damage induced by high stress concentrations in brittle rock masses has relied on empirical

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Study on the Influences of Empty Hole and In Situ Stress

May 08, 2021 · Blasting has been used extensively in deep underground excavation. In this paper, a numerical simulation LS-DYNA was carried out to investigate the influence of in situ stress and empty hole on rock fracture development. Based on the simulation process and existing laboratory data, the micromechanical properties of the Riedel-Hiermaier-Thoma (RHT) model …

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Predicting excavation damage zone depths in brittle rocks

that the damage caused by the excavation process increases the permeability from the undamaged rock mass and represents a potential contaminate transport or leakage pathway. To date pre-dicting the depth of excavation related damage induced by high stress concentrations in brittle rock masses has relied on empirical

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Numerical Simulation on Damage and Failure Mechanism of

The study on the damage mechanism of rock under multistrain-rate condition that induced by mining excavation is the fundamental issue for predicting the mining-induced hazards such as rockburst. In this study, the state of the art of rock damage and failure under different strain rates is reviewed first.

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Study of excavation induced rock damage at the Grimsel

The Rock Mechanics Lab of the Swiss Federal Institute of Technology, Lausanne, was in charge of a field study dealing with the damage caused to the rock by the excavation of a gallery. The following parameters were examined for the characterization of rock damage: displacement, velocity of elastic waves, rock deformability and permeability.

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Predicting excavation damage zone depths in brittle rocks

Abstract During the construction of an underground excavation, damage occurs in the surrounding rock mass due in large part to stress changes. While the predicted damage extent impacts profile selection and support design, the depth of damage is a critical aspect for the design of permeability sensitive excavations, such as a deep geological repository (DGR) for …

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(PDF) An Estimation of the Excavation Damaged Zone at the

In this study, physical, mechanical, and thermal properties of rock samples were investigated to estimate the Excavation Damaged Zone (EDZ) developed during the construction of the KAERI Underground Research Tunnel. The average porosity in the EDZ

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Predicting excavation damage zone depths in brittle rocks

Abstract During the construction of an underground excavation, damage occurs in the surrounding rock mass due in large part to stress changes. While the predicted damage extent impacts profile selection and support design, the depth of damage is a critical aspect for the design of permeability sensitive excavations, such as a deep geological repository (DGR) for …

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Lei, Qinghua, Dr. | ETH Zurich - erdw.ethz.ch

A case study based on the site characterization data of a crystalline rock at Sellafield is presented, where significant hydro-mechanical responses induced by excavation and drainage are observed, including stress redistribution, damage evolution, fracture …

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In situ experiments on width and evolution characteristics

Up to10%cash back · Nov 19, 2011 · Egger P. Study of excavation induced rock damage at the grimsel underground rock laboratory. Nucl Eng Ng Des, 1989, 116: 11–19 Article Google Scholar 11 Sato T, Kikuchi T, Sugihara K. In-situ experiments on an excavation disturbed zone induced by mechanical excavation in Neogene sedimentary rock at Tono mine, central Japan.

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Villiger, L., Gischig, V. S., Kwiatek, G., Krietsch, H

We investigated the induced seismicity, source mechanisms and mechanical responses of a decametre-scale hydraulic stimulation of a pre-existing shear zone in crystalline rock, at the Grimsel Test Site, Switzerland. The analysis reveals the metre-scale complexity of hydraulic stimulation, which remains hidden at the reservoir-scale.

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Minerals | Free Full-Text | Quantifying the Porosity of

The porosity and pore geometry of rock samples from a coherent granodioritic rock body at the Grimsel Test Site in Switzerland was characterised by different methods using injection techniques. Results from in situ and laboratory techniques are compared by applying innovative in situ resin impregnation techniques as well as rock impregnation and mercury injection under …

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Study on Damage Characteristic of Underground Cavern

The dynamic disturbance to the remaining surrounding rock mass of underground caverns produced by blasting excavation can not be ignored. Considering the rock mass damage induced by compression-shear stress in the zone near the blasthole, the KUS dynamic damage constitutive model was improved, and adding the defined damage discrimination value to the

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HYBRID FINITE-DISCRETE ELEMENT MODELLING OF BLAST- …

excavation damage zone (EDZ) are obtained. Therefore, the proposed treatment has the capabilities of modelling blast-induced EDZ and rock failure process. It is concluded that the hybrid FEM/DEM is a valuable numerical tool for studying excavation damage zone in terms of crack initiation and propagation and stress distribution. KEYWORDS

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Study on the Influences of Empty Hole and In Situ Stress

Research Article Study on the Influences of Empty Hole and In Situ Stress on Blasting-Induced Rock Damage Ningkang Meng,1,2 Jian-biao Bai,1,2,3 Wenlong Shen,1,2,4 Yong Chen,1,2 Xiangyu Wang,2 Wenda Wu,1,2 and Bowen Wu1,2 1Key Laboratory of Deep Coal Resource Mining Ministry of Education, State Key Laboratory of Coal Resources and Safe Mining, Xuzhou, China 2School …

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Paper: Quantifying excavation-induced rock mass damage in

Abstract: Open pit excavation induces rock mass damage as a result of stress release and blasting. The damage reduces the rock mass strength and stiffness. The strength reduction is typically quantified by the Hoek–Brown disturbance factor (D). Limitations of this approach are outlined in the paper.

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repositories Rock physics and geomechanics in the study of

Stress-induced anomalies in fluid pressure observed during the damage in hard rocks can be estimated indirectly excavation of the FEBEX (Full-Scale Engineered from the variation of elastic-wave velocities Barriers Experiment) tunnel in the Grimsel test (Takemura & Oda 2005), an important point when site (Switzerland): they argued that the

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DECOVALEX PUBLICATIONS

Thermally induced mechanical and permeability changes around a nuclear waste repository - A far-field study based on equivalent properties determined by a discrete approach, International Journal of Rock Mechanics and Mining Sciences, 42(5-6), 765-780.

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Climate adaptation strategy for the Grimsel area in the

The 'Climate Adaptation Strategy for the Grimsel Area' ( Bender-Gàl et al., 2016) recognizes that growing risks due to climate change and other on-going social developments are closely interlinked. It thus tackles climate adaptation and sustainable regional development in a coupled way ( Steinemann et al., 2017 ).

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