Excavation-induced damage studies at the Underground Research Laboratory

Martino, J.B.; Chandler, N.

doi:10.1016/j.ijrmms.2004.09.010

Cited by 352 publications

(134 citation statements)

References 1 publication

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“…This notch may be related to high stress concentrations that could create new fractures or extend and open fractures created by the drill-and-blast operation. Moreover, monitoring of microseismic events shows clusters surrounding the notches at the top and bottom to the tunnel cross section (Martino and Chandler, 2004). On the other hand, no extensive fall-out of rock was recorded.…”

Section: Relevant Field Observations At the Tsx Tunnelmentioning

confidence: 92%

“…dynamic forces during drilling and blasting) and damage caused by stress concentrations around the tunnel opening. That at least some of the observed fracturing is caused by the excavation process is indicated by observations of similar extent of the damage zone around a tunnel (BDA tunnel) excavated with the same drill-and-blast method at 240 m depth, where the in situ stress magnitudes are low enough that stress-induced damage does not generally occur around the tunnels (Martino and Chandler, 2004). However, Figure 1 indicates a notch-like extension of the inner damage zone detected by the SEPPI measurements at the top and bottom of the tunnel.…”

Section: Relevant Field Observations At the Tsx Tunnelmentioning

confidence: 96%

“…Borehole camera surveys showed an increased degree of macroscopic damage (visible fractures) in the inner damage zone area. The highest hydraulic transmissivities were generally recorded in the regions where the borehole camera detected the majority of the fracturing along the borehole walls (Martino and Chandler, 2004).…”

Section: Relevant Field Observations At the Tsx Tunnelmentioning

confidence: 97%

“…The TSX tunnel (Room 425) excavated at a depth of 420 m is one of a series of experimental tunnels at URL that have been studied with respect to the evolution of the EDZ around tunnels in granitic rock (Martino and Chandler, 2004). To minimize the EDZ, the TSX tunnel was excavated using smooth drill-and-blast techniques in an elliptical cross section of 3.5 m high, 4.375 m wide (with a horizontal to vertical aspect ratio of 1.25).…”

Section: Relevant Field Observations At the Tsx Tunnelmentioning

confidence: 99%

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Modeling of damage, permeability changes and pressure responses during excavation of the TSX tunnel in granitic rock at URL, Canada

et al. 2008

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This paper presents numerical modeling of excavation-induced damage, permeability changes, and fluid-pressure responses during excavation of the TSX tunnel at the underground research 2 laboratory (URL) in Canada. Four different numerical models were applied, using a wide range of approaches to model damage and permeability changes in the excavation disturbed zone (EDZ) around the tunnel. Using in situ calibration of model parameters the modeling could reproduce observed spatial distribution of damage and permeability changes around the tunnel, as a combination of disturbance induced by stress redistribution around the tunnel and by the drill-and-blast operation. The modeling showed that stress-induced permeability increase above the tunnel is a result of micro and macrofracturing under high deviatoric (shear) stress, whereas permeability increases alongside the tunnel as a result of opening of existing microfractures under decreased mean stress. The remaining observed fracturing and permeability changes around the periphery of the tunnel were attributed to damage from the drill-and-blast operation.Moreover, a reasonably good agreement was achieved between simulated and observed excavation-induced pressure responses around the TSX tunnel for 1 year following its excavation. The simulations showed that these pressure responses are caused by poroelastic effects as a result of increasing or decreasing mean stress, with corresponding contraction or expansion of the pore volume. The simulation results for pressure evolution were consistent with previous studies, indicating that the observed pressure responses could be captured in a Biot model using a relatively low Biot-Willis' coefficient, α ≈ 0.2, a porosity of n ≈ 0.007, and a relatively low permeability of k ≈ 2×10 -22 m 2 , which is consistent with the very tight, unfractured granite at the site.

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Section: Relevant Field Observations At the Tsx Tunnelmentioning

confidence: 92%

Section: Relevant Field Observations At the Tsx Tunnelmentioning

confidence: 96%

Section: Relevant Field Observations At the Tsx Tunnelmentioning

confidence: 97%

Section: Relevant Field Observations At the Tsx Tunnelmentioning

confidence: 99%

See 2 more Smart Citations

Modeling of damage, permeability changes and pressure responses during excavation of the TSX tunnel in granitic rock at URL, Canada

et al. 2008

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“…Ding [2] summarized the safety risks and risk factors of the metro construction, interpreted the acquisition process of risk identification rules, and the production of rule-extensions and the storage of rule structures. Martino [3] conducted experimental analysis and showed that a zone of irreversibly damaged rock surrounding the excavation, which may include failed zones, inner and outer damage zones and a zone of excavation disturbance where the in situ stresses were influence by the excavation no damage was measurable.…”

Section: Introductionmentioning

confidence: 99%

Discrete element analysis of the excavation effect of cross-river tunnel on the surroundings

Liu

Zhang

2017

MATEC Web Conf.

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Abstract. Cross-river tunnel as one of the underground constructions is complicated during its construction. For stability of tunnel excavation, it is emergency to analyze the dynamic characteristics of tunnel deformation under high water pressure. Therefore, a cross-river tunnel model is proposed based on DEM in this paper. Stiffness of particles decreases during excavation process which is as one of excavation methods. Porosity ratio of original porosity over its value at different excavation time has been considered. Radial displacements of particles at different angle around the tunnel are detected during excavation process. It shows that large deformation occurs at the vault of the excavation zone which accompanies with large radial displacement. The upper half of the tunnel performs larger deformation than the lower half part which results in many cracks in the concrete lining, the high water pressure may play an crucial role in it.

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Multiscale Modeling of Anisotropic Unilateral Damage in Quasi‐brittle Geomaterials: Formulation and Numerical Applications

Kondo¹,

Zhu²,

Shao³

et al. 2008

Constitutive Modeling of Soils and Rocks

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Excavation-induced damage studies at the Underground Research Laboratory

Cited by 352 publications

References 1 publication

Modeling of damage, permeability changes and pressure responses during excavation of the TSX tunnel in granitic rock at URL, Canada

Modeling of damage, permeability changes and pressure responses during excavation of the TSX tunnel in granitic rock at URL, Canada

Discrete element analysis of the excavation effect of cross-river tunnel on the surroundings

Multiscale Modeling of Anisotropic Unilateral Damage in Quasi‐brittle Geomaterials: Formulation and Numerical Applications

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