Volume Variation In A Clayey Soil
Depending On Water Content And Compaction:
An Experimental Approach
Author(s)
A. Guarnieri & G. Lorenzini
Abstract
The present paper performs a laboratory analysis of the swelling/shrinking
behaviour with water of a vertisol collected at Baricella, near Bologna (Italy).
This required an experimental apparatus to be realised and tested to monitor the
mutual affections between the soil-fluid dynamics parameters. Lower initial
water contents and higher initial degrees of compaction proved to enhance the
swelling evidence. A phenomenological analysis is also provided within the
paper. Further tests also on soils with different properties are felt necessary to
widen the field of application of this approach.
Keywords: void ratio, moisture ratio, swelling, shrinkage, compaction.
1 Introduction
In soil-fluid dynamics and, more generally, in agriculture the problem of
describing the behaviour of swelling soils as they come in contact with water is
particularly felt as: 1) almost every soil shows, up to a certain extent, swelling
properties; 2) by irrigating the fields or even in case of rain the contact of
swelling soils and water is unavoidable and, more, is necessary; 3) if a soil
swells then its internal cracks are forced to widen and this causes an intense
mechanical action on the roots of the crops that could lead to a breakage and so a
to a severe damaging of the harvest; 4) the variation of the soil pores dimensions
consequent to swelling determines an internal water potential changing that can
dramatically modify, even without a homogeneous distribution, the suction force
exerted by a crop to get water by means of its roots. Despite its clear relevance,
tackling the topic of swelling dynamics has never been a very popular research
Keywords
void ratio, moisture ratio, swelling, shrinkage, compaction.
Related Book
Other papers in this volume
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