The decrease in the shear strength of volcanic materials with argillic hydrothermal alteration, insights from the summit region of Teide stratovolcano, Tenerife

Potro, Rodrigo del; Hürlimann, Marcel

doi:10.1016/j.enggeo.2008.09.005

Cited by 70 publications

(46 citation statements)

References 31 publications

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“…This result conforms to other studies of the effect of kaolinization on mechanical properties (Potro and Hürlimann, 2009;Coggan et al, 2013).…”

Section: Opalitessupporting

confidence: 94%

“…Potro and Hürlimann (2009) studied the alteration of phonolitic lava to weak, porous, silty, medium-plasticity clay-rich soil due to kaolinization. They showed that the presence of significant amounts of kaolinite in the partially altered soil was the reason for a lower strength than in the fully altered alunitic one.…”

Section: Hydrothermal Claysmentioning

confidence: 99%

“…Under the action of thermal water, physical and mechanical properties of rocks change widely. Many publications reveal that alteration processes generally result in mechanically weaker rock (Potro and Hürlimann, 2009;Rigopoulos et al, 2010;Coggan et al, 2013) while some other studies propose more variable property changes (Sigurdsson et al, 2000;Bozkurtoğlu et al, 2006;Lutz et al, 2011;Siratovich et al, 2012;Wyering et al, 2012). Our previous studies have shown that these changes depend on a number of factors including parent rocks, РТ-conditions, composition and type of fluid, and duration of fluid-rock interaction (Frolova et al, 1999(Frolova et al, , 2010(Frolova et al, , 2011.…”

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Effects of hydrothermal alterations on physical and mechanical properties of rocks in the Kuril–Kamchatka island arc

Frolova

Vladimir

Sergey

et al. 2014

Engineering Geology

105

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“…This result conforms to other studies of the effect of kaolinization on mechanical properties (Potro and Hürlimann, 2009;Coggan et al, 2013).…”

Section: Opalitessupporting

confidence: 94%

Section: Hydrothermal Claysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Effects of hydrothermal alterations on physical and mechanical properties of rocks in the Kuril–Kamchatka island arc

Frolova

Vladimir

Sergey

et al. 2014

Engineering Geology

105

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“…Uniaxial compressive strength and bulk density of the different layers range between 10 and15 MPa and 15 and 19 kN/m3, respectively. These values are comparable to those described for similar lithologies (Moon 1993;Tuğrul 2004;Binal 2009;Del Potro and Hürlimann 2009;Rodríguez-Losada et al 2009;Pola et al 2012), and they will be defined in more detail by means of future testing campaigns.…”

Section: Geomorphology and Geologysupporting

confidence: 77%

Landslide hazard, monitoring and conservation strategy for the safeguard of Vardzia Byzantine monastery complex, Georgia

et al. 2015

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This paper reports preliminary results of a feasibility project developed in cooperation with National Agency for Cultural Heritage Preservation of Georgia, and aimed at envisaging the stability conditions of the Vardzia monastery slope (rupestrian city cave in the south-western Georgia). The aim is the implementation of a low-impact monitoring system together with long-term mitigation/conservation policies. A field analysis was conducted to reconstruct geometry of the rocky cliff, characteristics of discontinuities, main failure modes, and volume of potential unstable blocks and geomechanical parameters. Instability processes are the combination of causative factors such as the following: lithology, frequency and orientation of discontinuities, slope orientation, physical and mechanical characteristics of slope-forming materials, and morphological and hydrological boundary conditions. The combined adoption of different survey techniques (e.g., 3D laser scanner, ground-based radar interferometry) could be the best solution in the interdisciplinary field of cultural heritage preservation policies. The collected data will be the basis for future activities to be completed in collaboration with local authorities for a complete hazard and risk characterization for the monastery site and the development of an early warning system to allow safe exploitation for touristic activities and for historical site preservation.

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“…Rocks that have undergone extensive argillic alteration tend to be less dense than unaltered rocks. Further, hydrothermal alteration tends to be concentrated in brecciated or pyroclastic deposits that have a relatively low primary (pre‐alteration) density (del Potro & Hürlimann, , ; Mielke et al, ). In the simulations, densities of 2,500 and 1,700 kg/m 3 were assigned to unaltered and altered rocks, respectively (Table ), consistent with recent studies of rock material properties (Mielke et al, ; Pola et al, ; Siratovich et al, ; Wyering et al, ).…”

Section: Modeling Methods and Input Parametersmentioning

confidence: 99%

Combining Multiphase Groundwater Flow and Slope Stability Models to Assess Stratovolcano Flank Collapse in the Cascade Range

et al. 2018

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Hydrothermal alteration can create low‐permeability zones, potentially resulting in elevated pore‐fluid pressures, within a volcanic edifice. Strength reduction by rock alteration and high pore‐fluid pressures have been suggested as a mechanism for edifice flank instability. Here we combine numerical models of multiphase heat transport and groundwater flow with a slope‐stability code that incorporates three‐dimensional distributions of strength and pore‐water pressure to address the following questions: (1) What permeability distributions and contrasts produce elevated pore‐fluid pressures in a stratovolcano? (2) What are the effects of these elevated pressures on flank stability? (3) Finally, what are the effects of magma intrusion on potential flank failure in an edifice? Simulation results show that under a range of plausible parameters, water tables in a stratovolcano can be elevated or perched. These elevated water tables result in universally lower stability (lower factor of safety) compared with equivalent dry edifices, indicating a higher likelihood of flank collapse. Low‐permeability (<1 × 10−17 m2) layers such as altered pyroclastic deposits or breccias can result in locally saturated regions (perched water) and lower factors of safety near the ground surface but may actually reduce liquid water saturation and pore pressures in the core of the edifice and thus may favor small, shallow collapses over larger, deeper collapses. Magma intrusion into the base of the edifice increases pore‐fluid pressures and decreases the factor of safety. However, the shear strength of edifice rocks also exerts a significant control on stability, so both mechanical properties and pore‐fluid pressures are important for stability assessments.

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The decrease in the shear strength of volcanic materials with argillic hydrothermal alteration, insights from the summit region of Teide stratovolcano, Tenerife

Cited by 70 publications

References 31 publications

Effects of hydrothermal alterations on physical and mechanical properties of rocks in the Kuril–Kamchatka island arc

Effects of hydrothermal alterations on physical and mechanical properties of rocks in the Kuril–Kamchatka island arc

Landslide hazard, monitoring and conservation strategy for the safeguard of Vardzia Byzantine monastery complex, Georgia

Combining Multiphase Groundwater Flow and Slope Stability Models to Assess Stratovolcano Flank Collapse in the Cascade Range

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