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On the dilatancy of root-permeated soils under partially saturated conditions

Lookup NU author(s): Dr Anil Yildiz



This is the authors' accepted manuscript of an article that has been published in its final definitive form by ICE Publishing, 2020.

For re-use rights please refer to the publisher's terms and conditions.


Mechanical contribution of roots to the shear strength of saturated soils is not the only function of vegetation in favour of slope stability. Plants also cause an increase in the strength due to plant-induced suction, resulting from partial saturation. Although understanding, quantifying and modelling the shearing behaviour of soils is directly related to the volume change characteristics of soil, dilative behaviour of rooted soils has not been of much interest. Large-scale suction-monitored direct shear tests were performed on specimens planted with a mixture of species from different plant functional groups. Increase in matric suction, which was linked to root biomass and root : shoot ratio, resulted in higher maximum dilatancy angles. It was also found that maximum dilatancy is controlled by net normal stress, but not effective stress.

Publication metadata

Author(s): Yildiz A, Graf F, Springman SM

Publication type: Article

Publication status: Published

Journal: Géotechnique Letters

Year: 2020

Volume: 10

Issue: 2

Pages: 1-4

Print publication date: 01/06/2020

Online publication date: 17/02/2020

Acceptance date: 23/12/2019

Date deposited: 04/03/2020

ISSN (print): 2049-825X

ISSN (electronic): 2045-2543

Publisher: ICE Publishing


DOI: 10.1680/jgele.19.00048


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