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Determination of the shearing behaviour of root-permeated soils with a large-scale direct shear apparatus

Lookup NU author(s): Dr Anil Yildiz



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Soils with roots or root-like inclusions have often been tested in direct shear to quantify the effects of vegetationon the shear strength of soil, and in turn, the stability of slopes. However, a straightforward evaluation of rootreinforcement is challenging due to the complex nature of roots, and the dependency of soil behaviour on manyfactors. An Inclinable Large-scale Direct Shear Apparatus (ILDSA) was built to study the shearing behaviour ofroot-permeated soils. Planted specimens, consisting of two different sets of species, were prepared with amoraine, sampled from a recent landslide location, and tested in direct shear subsequent to saturation.Relationships of peak stress ratio with dry weight of roots, maximum dilatancy angle and void ratio were in-vestigated to evaluate the behaviour of root-permeated soil. The combined approach, of taking both presence ofroots and dilatant behaviour of soil into consideration, results in a more realistic understanding and quantifi-cation of the effects of root reinforcement, at least, for laboratory testing of root-permeated soils

Publication metadata

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

Publication type: Article

Publication status: Published

Journal: CATENA

Year: 2018

Volume: 166

Pages: 98-113

Print publication date: 01/07/2018

Online publication date: 04/04/2018

Acceptance date: 23/04/2018

Date deposited: 17/02/2020

ISSN (print): 0341-8162

ISSN (electronic): 1872-6887

Publisher: Elsevier


DOI: 10.1016/j.catena.2018.03.022


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