Bulk and mechanical properties of the Paintbrush tuff recovered from borehole USW NRG-6: Data report

Martin, R. F.; Boyd, P.J.; Noël, Jean-Yves; Price, R.H.

doi:10.2172/60822

Cited by 15 publications

(26 citation statements)

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“…Mechanical properties for TSW2 have been analyzed statistically; the results of the statistical analysis are included in section 1.322 of the RIB and are summarized here in Table 44. Recent measurements of mechanical properties such as ultimate strength and elastic moduli for tuff by Teufel and McNamee (1991) and Martin et al (1993Martin et al ( , 1994 are in generid agreement with the values given in Table 44. Lin et al (1993b) used information about intact rock mass properties and fracture/joint characteristics to develop models of rock mass properties and rock mass qualities.…”

Section: 213supporting

confidence: 82%

“…For example, some of the borehole samples failed at pressures well below 100 MPa (Martinet al, 1994 rather than having strengths between approximately 100 and 200 MPa as described in the RIB. Poisson's ratio values for the borehole samples of TSW2 ranged from about 0.14 to 0.40 (Martin et al, , 1995a, and the TSW2 samples from Busted Butte had static Poisson's ratio values of about 0.09 .…”

Section: -4mentioning

confidence: 97%

“…4-2. Martin et al (1993Martin et al ( , 1994Martin et al ( , 1995a) measured unconfined compressive strength, static Young's modulus and Poisson's ratio, and elastic wave velocities for Topopah Spring tuff samples from Busted Butte and from the USW NRG-6 and USW NRG-7/7A boreholes at Yucca Mountain. These holes intersected the path of the north ramp of the Exploratory Studies Facility (ESF) and are part of a series of holes identified as the North Ramp Geotechnical (NRG) holes.…”

Section: -4mentioning

confidence: 99%

“…They also provide a convenient method for characterizing anisotropy in the rock behavior. Compressional and shear wave velocity measurements were made at frequenaes of about 300 to 800 kHz for the Busted Butte samples and about 300 kHz to 1 MHz for the borehole samples, for both the dry and the saturated cases by Martin et al, 1993Martin et al, , 1994Martin et al, , 1995a. This corresponds to wavelengths of a few mm to a few cm in the tuff.…”

Section: -4mentioning

confidence: 99%

“…The borehole samples of tuff had only two shear wave veloaty measurements for the saturated case, 2.7 and 2.9 km/s (Martin et al, , 1995a. For the dry case, the borehole samples had shear wave velocities of 2.4 to 3.0 km/s (Martinet al, 1994(Martinet al, , 1995a.…”

Section: -4mentioning

confidence: 99%

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Volume II: near-field and altered-zone environment report

Wilder¹

1996

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Section: 213supporting

confidence: 82%

Section: -4mentioning

confidence: 97%

Section: -4mentioning

confidence: 99%

Section: -4mentioning

confidence: 99%

Section: -4mentioning

confidence: 99%

See 3 more Smart Citations

Volume II: near-field and altered-zone environment report

Wilder¹

1996

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The influence of water on the strength of Neapolitan Yellow Tuff, the most widely used building stone in Naples (Italy)

et al. 2018

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The mechanical behaviour and failure modes of volcanic rocks: a review

2021

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The microstructure and mineralogy of volcanic rocks is varied and complex, and their mechanical behaviour is similarly varied and complex. This review summarises recent developments in our understanding of the mechanical behaviour and failure modes of volcanic rocks. Compiled data show that, although porosity exerts a first-order influence on the uniaxial compressive strength of volcanic rocks, parameters such as the partitioning of the void space (pores and microcracks), pore and crystal size and shape, and alteration also play a role. The presence of water, strain rate, and temperature can also influence uniaxial compressive strength. We also discuss the merits of micromechanical models in understanding the mechanical behaviour of volcanic rocks (which includes a review of the available fracture toughness data). Compiled data show that the effective pressure required for the onset of hydrostatic inelastic compaction in volcanic rocks decreases as a function of increasing porosity, and represents the pressure required for cataclastic pore collapse. Differences between brittle and ductile mechanical behaviour (stress-strain curves and the evolution of porosity and acoustic emission activity) from triaxial deformation experiments are outlined. Brittle behaviour is typically characterised by shear fracture formation, and an increase in porosity and permeability. Ductile deformation can either be distributed (cataclastic pore collapse) or localised (compaction bands) and is characterised by a decrease in porosity and permeability. The available data show that tuffs deform by delocalised cataclasis and extrusive volcanic rocks develop compaction bands (planes of collapsed pores connected by microcracks). Brittle failure envelopes and compactive yield caps for volcanic rocks are compared, highlighting that porosity exerts a first-order control on the stresses required for the brittle-ductile transition and shear-enhanced compaction. However, these data cannot be explained by porosity alone and other microstructural parameters, such as pore size, must also play a role. Compactive yield caps for tuffs are elliptical, similar to data for sedimentary rocks, but are linear for extrusive volcanic rocks. Linear yield caps are considered to be a result of a high pre-existing microcrack density and/or a heterogeneous distribution of porosity. However, it is still unclear, with the available data, why compaction bands develop in some volcanic rocks but not others, which microstructural attributes influence the stresses required for the brittle-ductile transition and shear-enhanced compaction, and why the compactive yield caps of extrusive volcanic rocks are linear. We also review the Young’s modulus, tensile strength, and frictional properties of volcanic rocks. Finally, we review how laboratory data have and can be used to improve our understanding of volcanic systems and highlight directions for future research. A deep understanding of the mechanical behaviour and failure modes of volcanic rock can help refine and develop tools to routinely monitor the hazards posed by active volcanoes.

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Bulk and mechanical properties of the Paintbrush tuff recovered from borehole USW NRG-6: Data report

Cited by 15 publications

References 0 publications

Volume II: near-field and altered-zone environment report

Volume II: near-field and altered-zone environment report

The influence of water on the strength of Neapolitan Yellow Tuff, the most widely used building stone in Naples (Italy)

The mechanical behaviour and failure modes of volcanic rocks: a review

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