Physico-chemical effects on the behaviour of a coastal mudslide

Moore, R.; Brunsden, D.

doi:10.1680/geot.1997.47.2.367

Cited by 5 publications

(8 citation statements)

References 9 publications

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“…There are many reports, all over the world, about landslides that have smectite‐dominated slip‐surface soils [e.g., Gibo et al ., ; Stark and Eid , ; Moore and Brunsden , ; Shuzui , ; Mayumi et al ., ; Hancox , ; Azañón et al ., ; Massey et al ., ]. Smectite‐rich soils show an extremely low residual frictional angle [e.g., Kenney , ], and therefore, landslides with such slip‐surface soils can easily become unstable and are likely to reactivate on very gentle slopes.…”

Section: Discussionmentioning

confidence: 99%

“…[] reported that atmospheric tides can affect the slope stability and correlate with landslide velocities. A decrease in pore solution concentration (leaching of salts) is also considered to influence slope instability in marine mudstone areas [ Moore and Brunsden , ; Di maio and Scaringi , ]. Although no attention has been paid to ground temperature as a trigger for landslides, we recently reported interesting landslides that can be activated by a decrease in ground temperature [ Shibasaki et al ., ].…”

Section: Discussionmentioning

confidence: 99%

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Temperature‐dependent residual shear strength characteristics of smectite‐bearing landslide soils

Shibasaki

Matsuura

Hasegawa³

2017

JGR Solid Earth

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This paper presents experimental investigations regarding the effect of temperature on the residual strength of landslide soils at slow‐to‐moderate shearing velocities. We performed ring‐shear tests on 23 soil samples at temperatures of 6–29°C. The test results show that the shear strength of smectite‐rich soils decreased when temperatures were relatively low. These positive temperature effects (strength losses at lower temperatures) observed for smectite‐bearing soils are typical under relatively slow shearing rates. In contrast, under relatively high shearing rates, strength was gained as temperature decreased. As rheological properties of smectite suspensions are sensitive to environmental factors, such as temperature, pH, and dissolved ions, we inferred that temperature‐dependent residual strengths of smectitic soils are also attributed to their specific rheological properties. Visual and scanning electron microscope observations of Ca‐bentonite suggest that slickensided shear surfaces at slow shearing rates are very shiny and smooth, whereas those at moderate shearing rates are not glossy and are slightly turbulent, indicating that platy smectite particles are strongly orientated at slow velocities. The positive temperature effect is probably due to temperature‐dependent microfriction that is mobilized in the parallel directions of the sheet structure of hydrous smectite particles. On the contrary, the influence of microviscous resistance, which appears in the vertical directions of the lamination, is assumed to increase at faster velocities. Our results imply that if slip‐surface soils contain high fractions of smectite, decreases in ground temperature can lead to lowered shear resistance of the slip surface and trigger slow landslide movement.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Temperature‐dependent residual shear strength characteristics of smectite‐bearing landslide soils

Shibasaki

Matsuura

Hasegawa³

2017

JGR Solid Earth

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“…6.2 | Impact of pore water chemistry on the clayey soil structure and the mechanical parameters Dilute water results in a reduction of shear strength (Moore and Brunsden, 1996;Di Maio et al, 2004Picarelli et al, 2006), especially for material in which smectite is the dominant clay mineral and in which Na is progressively substituted by Ca on the clay surface. Thus, if the total ionic concentration of water is increasing, shear strength and soil stability increase.…”

Section: Conceptual Groundwater Flow System At Draix-laval Landslidementioning

confidence: 99%

Groundwater—Surface waters interactions at slope and catchment scales: implications for landsliding in clay‐rich slopes

Marc

Bertrand

Malet

et al. 2016

Hydrological Processes

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Understanding water infiltration and transfer in soft-clay shales slopes is an important scientific issue, especially for landsliding. Geochemical investigations are carried out at the Super-Sauze and Draix-Laval landslides, both developed in the Callovo-Oxfordian black marls, with the objective to define the origin of the groundwater. In situ investigations, soil leaching experiments and geochemical modeling are combined to identify the boundaries of the hydrological systems. At Super-Sauze, the observations indicate that an external water flow occurs in the upper part of the landslide at the contact between the weathered black marls and the overlying formations, or at the landslide basement through a fault network. Such external origin of water is not observed at the local scale of the Draix-Laval landslide but is detected at the catchment scale with the influence of deep waters in the streamwater quality of low river flows. Hydrogeological conceptual models are proposed emphasizing the role of the interactions between local (slope) and regional (catchment) flow systems. The observations suggest that this situation is a common case in the Alpine area. Expected consequences of the regional flows on slope stability are discussed in term of rise of pore water pressures and physicochemical weathering of the clay shales

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“…hence the volume of the solid phase (per unit initial volume of the porous skeleton) coincides with 1 bg n v v    , where n the 'chemically affected' porosity defined by eqn. ( 9).…”

Section: A) B)mentioning

confidence: 99%

Chemo-mechanical modeling of artificially and naturally bonded soils

Gajo

Cecinato

Hueckel

2019

Geomechanics for Energy and the Environment

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Chemo-mechanical effects are known to be significant in a number of applications in modern geomechanics, ranging from slope stability assessment to soil improvement and CO2 sequestration. This work focuses on coupled chemo-mechanical modeling of bonded geomaterials undergoing either mechanical strengthening, due to increased cementation, or weakening, due to cement dissolution. A constitutive model is developed that accounts for the multi-scale nature of the chemo-mechanical problem, introducing some cross-scale functions establishing a relationship between the evolution of microscopic variables and the macroscopic material behavior, realistically following the evolution of the reactive surface area, cross-sectional area and the number of bonds along with dissolution/deposition. The model presented here builds up on a previously introduced framework. However, at variance with existing works, it is specialized on materials with only reactive bonds, such as carbonate cemented sandstone or microbially cemented silica sand. Model validation is provided upon reproducing different types of chemomechanical experimental datasets, on different naturally and artificially cemented materials, to establish the reliability of the proposed framework.

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Physico-chemical effects on the behaviour of a coastal mudslide

Cited by 5 publications

References 9 publications

Temperature‐dependent residual shear strength characteristics of smectite‐bearing landslide soils

Temperature‐dependent residual shear strength characteristics of smectite‐bearing landslide soils

Groundwater—Surface waters interactions at slope and catchment scales: implications for landsliding in clay‐rich slopes

Chemo-mechanical modeling of artificially and naturally bonded soils

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