Influence of modeling material on undercut slope failure mechanism | ||
| Journal of Mining and Environment | ||
| مقاله 11، دوره 8، شماره 4، دی 2017، صفحه 645-662 اصل مقاله (2.51 M) | ||
| نوع مقاله: Case Study | ||
| شناسه دیجیتال (DOI): 10.22044/jme.2017.5641.1373 | ||
| نویسندگان | ||
| M. H. Khosravi* 1؛ T. Pipatpongsa2؛ J. Takemura3؛ M. Amini1 | ||
| 1School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran | ||
| 2Construction Engineering Management, Division of Geo-management, Department of Urban Management, Kyoto University, Kyoto, Japan | ||
| 3Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Tokyo, Japan | ||
| چکیده | ||
| A series of physical modeling tests were conducted by means of a beam type geotechnical centrifuge machine in order to investigate the drainage impact on the slope failure mechanism under centrifugal acceleration. Meanwhile, the phenomenon of stress redistribution in undercut slopes and the formation of arching effect were studied. For this purpose, a poorly graded sandy soil (Silica sand No. 6) as well as a relatively well-graded sandy soil (Edosaki sand) were used as the modeling materials. The humid modeling material was compacted on a low friction oblique rigid plate simulating the potential slippage plane. The process of undercutting was conducted, while the earth pressure redistribution inside the model was recorded by means of a miniature set of pressure cells. The results obtained showed completely different failure mechanisms for the two different modeling soils. By undercutting the slope, the earth pressure redistributed and the arch action was formed in a slope model made from a well-graded soil leading to a clear arch-shaped failure. However, in using the poorly graded soil, the water was drained out during centrifuge g-up, the modeling material properties changed, and an avalanche failure was observed. Therefore, in selecting a humid compacted soil as the centrifugal modeling material, a well-graded soil is recommended. | ||
| کلیدواژهها | ||
| Centrifugal modeling؛ Undercut slopes؛ Soil material properties؛ Soil arching | ||
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