Small-scale laboratory flowslides

Spence, Kevin; Guymer, I.

doi:10.1680/geot.1997.47.5.915

Cited by 46 publications

(29 citation statements)

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“…The flows initially accelerated but at a certain stage of the process, unsteady deposition of the sand occurred, preceded by the transformation of the movement from flow to sliding. The phenomenon of deposition of the soil along the flume occurred at inclination greater than in the case of Spence and Guymer [51] experiments.…”

Section: Debris Flows Generated By Slope Failuresmentioning

confidence: 65%

Mechanical and fluid-dynamic behaviour of debris and hyper-concentrated flows: overview and challenges

Wrachien¹,

Mambretti²,

Deangeli³

2010

WIT Transactions on Engineering Sciences

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Debris and hyper-concentrated flows are among the most destructive of all water-related disasters. They mainly affect mountain areas in a wide range of morphoclimatic environments and in recent years have attracted more and more attention from the scientific and professional communities and concern from public awareness, due to the increasing frequency with which they occur and the death toll they claim. In this context, achieving a set of debris and hyper-concentrated flow constitutive equations is a task that has been given particular attention by scientists during the second half of the last century.In relation to these issues, this paper reviews the most updated and effective geotechnical and fluid-dynamic procedures nowadays available, suitable to predict the triggering and mobilising processes of these phenomena, and proposes a mathematical model that is able to assess the depth of the wave and the velocities of the liquid and solid phases of both non-stratified (mature) and stratified (immature) flows following flash-floods and dam-break events in one and two dimensional cases.Different experimental cases of dam-break situations in a square section channel were considered for the purpose of comparing results.These tools will allow, on one hand, to better focus on what to observe in the field and, on the other hand, to improve both mitigation measures and hazard mapping procedures. Keywords: debris flow, rheological behaviour of the mixture, slope failure, numerical models, laboratory and field tests.

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Section: Debris Flows Generated By Slope Failuresmentioning

confidence: 65%

Mechanical and fluid-dynamic behaviour of debris and hyper-concentrated flows: overview and challenges

Wrachien¹,

Mambretti²,

Deangeli³

2010

WIT Transactions on Engineering Sciences

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“…Spence and Guymer [9] in their flume experiments observed a deceleration of the flow and unsteady deposition of the sand along the flume. Measured pore pressure was just in excess to the hydrostatic condition and comparable to the value necessary to maintain equilibrium between driving and resisting forces.…”

Section: Discussionmentioning

confidence: 92%

“…Debris flows initiated by rapid removal of a water proof barrier [9,10,13] show different behaviors and different pore pressure patterns.…”

Section: Discussionmentioning

confidence: 99%

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Pore Water Pressure Contribution to Debris Flow Mobility

Deangeli¹

2009

American Journal of Environmental Sciences

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Problem statement: Debris flows are very to extremely rapid flows of saturated granular soils. Two main types of debris flow are generally recognized: Open slope debris flows and channelized debris flows. The former is the results of some form of slope failures, the latter can develop along preexisting stream courses by the mobilization of previously deposited debris blanket. The problem to be addressed is the influence of the mode of initiation on the subsequent mechanism of propagation. In particular the role of pore water pressure on debris flow mobility in both types was debated. Approach: Laboratory flume experiments were set up in order to analyze the behavior of debris flows generated by model sand slope failures. Failures were induced in sand slopes by raising the water level by seepage from a drain located at the top end of the flume, and by rainfall supplied by a set of pierced plastic pipes placed above the flume. Video recordings of the tests were performed to analyze debris flow characteristics. Results: In all the tests the sand water mixture flows were unsteady and non uniform and sand deposition along the channel bed was a relevant phenomenon. The flows were characterized by a behavioral stratification of the sand water mixture along the flow depth. Back analyzed pore water pressure were just in excess to the hydrostatic condition. The reliability of the experimental results was checked by comparison with other flume experiment data. Conclusion: Debris flow behavior was influenced by the mode of initiation, the inclination of the channel and grain size of the soils. These factors affected the attained velocities and the pore water pressure values. The mobility of debris flows was not always enhanced by high excess pore water pressure values.

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“…Water play an important role in debris flow, debris flow is more likely to happen [10][11] if the coefficient of permeability of sands falls into a certain range. Spence [12] detected excess pore water pressure in soils while carrying out small-scale flume model tests on fine grain slopes. Huang [13][14] believe that seepage force plays an important role in rainfall induced debris flow.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on failure mode of fine-grain rainfall-induced debris flow

Zhao¹,

Jian²,

Li³

et al. 2013

AIP Conference Proceedings

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Abstract. The failure mode of fine-grain debris flow is investigated by using self-designed flume model device. Artificial rainfall is applied onto grain slopes in a flume model. Full-field displacement contour of fine-grain rainfallinduced debris flow during failure process is analyzed by using Digital Photogrammetry Deformation Measurement (GEODOG). The studies indicate that the particle movement of fine grains' experimental results respectively concentrated on the anterior and rear of sand slope of debris flow. The pore water pressure test results show that in the fine grain sample it is higher than it in coarse sand.

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Small-scale laboratory flowslides

Cited by 46 publications

References 0 publications

Mechanical and fluid-dynamic behaviour of debris and hyper-concentrated flows: overview and challenges

Mechanical and fluid-dynamic behaviour of debris and hyper-concentrated flows: overview and challenges

Pore Water Pressure Contribution to Debris Flow Mobility

Experimental investigation on failure mode of fine-grain rainfall-induced debris flow

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