Author(s): Ignacio Caldino Villagomez; Isaac Bonola Alonso
Linked Author(s):
Keywords: Debris flows; Mud flows; Rheological parameters; Yield stress
Abstract: Rheological behavior of mud and debris flow acquire importance in numeric modeling this events which have produced as main damages, human life and economic losses, in several places in the world and specifically in Mexico have been more the events occurred in the last years. Owing the high sediment concentrations in the mixtures, exceed in several magnitude orders, the values usually observed for rivers, yet for large floods, it is necessary take account the influence of this parameter that have influence in a direct way in the mixture viscosity and the solid particles falling velocity. In Mexico, there are not references about mixtures water-sediments rheological studies for applying in natural mud and debris flows. For applying any simulation model it would be necessary use the values recommended in the related literature. Nevertheless, reported values are obtained for soil mixtures of a particular site and the conditions may vary in a significant way from the corresponding a interest area where is required to evaluate this flows occurrence. Therefore, it is necessary to dispose a methodology for estimating rheological parameters for conditions of Mexico. In this paper are presented results of experimental runs carried out in the Mexican Institute for Water Technology, IMTA for natural water-clay and water-clay-fine sand samples with concentrations higher than 14 % by weight for getting the yield stress adapting the method proposed for Pashias which is useful, simple and practical. We got relations concentration-yield stress that can be used in numerical simulation models for computing the performance of this flows in Mexico areas with similar features sediments. Values and tendency functions got are accord with reported in corresponding literature usually referred to works where are used sophisticated and expensive equipments.
Year: 2005