DBPapers
DOI: 10.5593/SGEM2014/B12/S2.115

THE CRITERIA OF STRENGTH AND STRAIN OF SOILS IN A GROUNDMASS

G.Postoev, A. Kazeev
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-08-7 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 2, 901-906 pp

ABSTRACT
The article discusses such important criteria of soil strength, as the soil structural strength, the soil strength condition according to the Coulomb-Mohr criterion (the condition of soil strength in a sample or in a point). The article also provides new equations of a limiting state, which are the criteria of the soil strength when appear the force disturbance in the form of reducing of vertical stresses in a local area. The development of destructive deformations during the formation of a landslide or a karst hole is preceded by the reach of a limiting state in a locally bounded area of the groundmass (massif). The mechanism of transformation of the initial state of the soil massif (groundmass) into new criteria of soil strength in a groundmass are given in the article. These criteria were concretized for the corresponding types of landslides and for different formation conditions of karst holes in the regions of karst-prone rocks distribution. The model of changing of the stress-strain state of a groundmass (with the formation of an active zone along the border of the core under the foundation and the passive rebuff loading at the side of a foundation) is considered for estimating of the limiting pressure along the bottom of a foundation and for calculating of foundation settlements.

Keywords: stress-strain state of a groundmass, soil structural strength, landslides, karst, foundation settlement.