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- Askarinejad, Amin, et al.
(författare)
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Effect of bedrock shape and drainage properties on the stability of slopes
- 2014
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Ingår i: Physical Modelling in Geotechnics - Proceedings of the 8th International Conference on Physical Modelling in Geotechnics 2014, ICPMG 2014. - 9781138022225 ; , s. 1211-1217
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Konferensbidrag (refereegranskat)abstract
- Rainfall induced slope failures were investigated in a series of centrifuge tests on slopes underlain by different bedrock profiles. These tests were designed to interpret observations made during two full scale landslide triggering experiments, focusing on the effect of hydro-mechanical interactions between a soil layer and bedrock during rainfall events. A climate chamber was designed and constructed for the ETH Zurich geotechnical drum centrifuge (Springman et al. 2001). Two different bedrock profiles were tested. The bedrock was parallel to the slope surface as the benchmark, whereas a convex form was placed at the toe of the slope in the alternative, which has potential to act as a supporting buttress. The changes in the pore pressures at the interface of the soil and bedrock were measured. Moreover, the surface movements were monitored by means of cameras installed in the climate chamber. The hydraulic and mechanical responses of the slopes suggested that a convex form of bedrock at the toe might have a "buttressing" effect to the upper parts of the slope due to arching. Moreover, this stabilising effect would be more pronounced if an efficient drainage system was in place behind the buttress to drain locally high pore pressures. © 2014 Taylor & Francis Group.
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| 2. |
- Askarinejad, Amin, et al.
(författare)
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Physical modelling of rainfall induced landslides undercontrolled climatic conditions
- 2012
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Konferensbidrag (refereegranskat)abstract
- A series of small scale physical modelling tests are performed in a geotechnical drumcentrifuge in order to investigate the triggering mechanisms of landslides due to rainfall. They areconducted under controlled conditions of rainfall intensity and duration, ambient relative humidity, wind,and temperature. These tests have been designed to study the possible failure mechanisms proposed for afull scale landslide experiment. Accordingly, different shapes and hydraulic properties of the bedrock, interms of drainage and exfiltration, are provided for the model. A three dimensional close rangephotogrammetric technique is used to track the movements and monitor the volumetric changes of theground during the cycles of wetting and drying. The slope elevation is filmed during and following therainfall events using a high speed camera and the deformation vectors and strains are elaborated using thePIV method. Details of the design of the climate chamber are discussed in this paper.
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| 3. |
- Springman, Sarah M, et al.
(författare)
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Ground improvement for embankments on soft ground
- 2014
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Ingår i: Institution of Civil Engineers. Proceedings. Ground Improvement. - : Thomas Telford Ltd.. - 1755-0750. ; 167:3, s. 149-161
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Tidskriftsartikel (refereegranskat)abstract
- Constructing embankments on soft ground to adhere to the requirements of modern codes of practice is challenging without ground improvement. An overview is presented on the types of columnar inclusions and embankment base reinforcement in terms of load–settlement behaviour, together with calculation procedures using partial safety factors. These are based on the Swiss Code 267, Switzerland's national annex to Eurocode 7; they are relevant in the project phase and in understanding the general behaviour of the whole system. Three-dimensional inclusions have been incorporated in a two-dimensional slip circle analysis. Simple assumptions are validated against a physical model for the serviceability limit state, with good agreement. First design approximations may therefore be calculated in this way.
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