Analysis of a retrogressive landslide in glaciolacustrine varved clay

Kohv, Marko; Hang, Tiit; Talviste, Peeter; Volli, Kalm

doi:10.1016/j.enggeo.2010.07.012

Cited by 18 publications

(11 citation statements)

References 15 publications

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“…The particular conditions that must be considered to explain the retrogressive aspects of this type of slip are rarely discussed in the reports that describe these slides [10,54]. The literature recognizes the particular behaviour of retrogressive slides [8,10,54,55]. Until recently, however, no modelling approach had been proposed for spread landslides, as described in the next section.…”

Section: Shear Strength Reduction Techniquementioning

confidence: 99%

“…recognizes the particular behaviour of retrogressive slides [8,10,54,55]. Until recently, however, no modelling approach had been proposed for spread landslides, as described in the next section.…”

Section: Modelling Of the Progressive Failure Mechanismmentioning

confidence: 99%

“…In Stage 3, the landslide continues its progression via sequential failure surfaces that progress upslope (Figure 1c). This landslide mechanism is characterized by a series of retrogressive rotational slips that collectively form a final landslide crater [9,10]. This sequence of events can be considered as a flowslide type of landslide [11].…”

Section: Introductionmentioning

confidence: 99%

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Overview of Retrogressive Landslide Risk Analysis in Sensitive Clay Slope

et al. 2020

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Sensitive clays are known for producing retrogressive landslides, also called spread or flowslides. The key characteristics associated with the occurrence of these landslides on a sensitive clay slope must be assessed, and the potential retrogressive distance must be evaluated. Common risk analysis methods include empirical methods for estimating the distance of potential retrogression, analytical limit equilibrium methods, numerical modelling methods using the strength reduction technique, and the integration of a progressive failure mechanism into numerical methods. Methods developed for zoning purposes in Norway and Quebec provide conservative results in most cases, even if they don’t cover the worst cases scenario. A flowslide can be partially analysed using analytical limit equilibrium methods and numerical methods having strength reduction factor tools. Numerical modelling of progressive failure mechanisms using numerical methods can define the critical parameters of spread-type landslides, such as critical unloading and the retrogression distance of the failure. Continuous improvements to the large-deformation numerical modeling approach allow its application to all types of sensitive clay landslides.

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Section: Shear Strength Reduction Techniquementioning

confidence: 99%

Section: Modelling Of the Progressive Failure Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Overview of Retrogressive Landslide Risk Analysis in Sensitive Clay Slope

et al. 2020

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“…The occurrence of landslides associated with glacio-lacustrine deposits have been well documented in the Alpine valleys of France (Jongmans et al 2009), British Columbia in Canada (Evans 1982;Lu et al 2000;Jackson 2002), Estonia and Baltic region (Kohv et al 2010) and the Italian Alps (Tibaldi et al 2004). In each case, the type of landsliding typically include rotational slides with mud flows developing in the displaced material and the evolution characteristics typically involve significant retrogressive behaviour (Geertsema et al 2006;Marko et al 2010). These landslides are often located in areas where varved clays are cut into by river erosion, reducing support and exposing bedding planes which dip down into the valleys (as a result of dip towards the centre of the previously ice-dammed lakes).…”

Section: Fig2mentioning

confidence: 99%

A new technique for the detection of large scale landslides in glacio-lacustrine deposits using image correlation based upon aerial imagery: A case study from the French Alps

Fernández

Whitworth

2016

International Journal of Applied Earth Observation and Geoinfor

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Landslide monitoring has benefited from recent advances in the use of image correlation of high resolution optical imagery. However, this approach has typically involved satellite imagery that may not be available for all landslides depending on their time of movement and location. This study has investigated the application of image correlation techniques applied to a sequence of aerial imagery to an active landslide in the French Alps. We apply an indirect landslide monitoring technique (COSI-Corr) based upon the cross-correlation between aerial photographs, to obtain horizontal displacement rates. Results for the2001-2003 time interval are presented, providing a spatial model of landslide activity and motion across the landslide, which is consistent with previous studies. The study has identified areas of new landslide activity in addition to known areas and through image decorrelation has identified and mapped two new lateral landslides within the main landslide complex. This new approach for landslide monitoring is likely to be of wide applicability to other areas characterised by complex ground displacements.

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“…Not taking this into account in geotechnical engineering may lead to some errors. Works related to constructions made in varved clays are [6][7][8]. However, in view of the complex nature of varved clay, testing and modelling its mechanical behavior is not a trivial issue.…”

Section: Introductionmentioning

confidence: 99%

Application of the nanoindentation technique for the characterization of varved clay

Tankiewicz

2018

Open Geosciences

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Nanoindentation is a test carried out in a small scale, during which a rigid indenter (of known hardness and geometry) is pressed into the tested material. The results of the test are the load and unload curves, from which the harerial characterized by high heterogeneity (like soil – composed of grains and particles of different size and mineral composition), the use of multiple nanoindentation on a predefined grid (Grid Indentation Technique) is reasonable. It allows for the determination of the morphology of the material in a selected scale of observation. In the study, nanoindetation tests were performed on samples of varved clay - soil composed of two alternately arranged layers - occurring near the city of Bełchatów in central Poland. Due to the layered structure of the material, the tests were carried out for both layers separately. The outcomes show that there are significant differences in the values of their mechanical properties. Application of the deconvolution technique also allowed for the estimation of the number of components of both layers and their mechanical properties.

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Analysis of a retrogressive landslide in glaciolacustrine varved clay

Cited by 18 publications

References 15 publications

Overview of Retrogressive Landslide Risk Analysis in Sensitive Clay Slope

Overview of Retrogressive Landslide Risk Analysis in Sensitive Clay Slope

A new technique for the detection of large scale landslides in glacio-lacustrine deposits using image correlation based upon aerial imagery: A case study from the French Alps

Application of the nanoindentation technique for the characterization of varved clay

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