Geomechanical models of shear fracture of multi-layer rocks

The strength and fracture of multi-layer rocks such as shale, clay stone, etc. are studied. The strength and fracture criteria are developed in two variants as a modification of the Mohr theory. The first variant generalizes the linear law of Coulomb in the form of a linear Mohr’s envelope, which is assumed as a parabolic curve in the second variant. A series of problems on strength of multi-layer rocks in different stress conditions is solved. The multi-layer rocks are formed in compaction of alternate layers during many-centuries sedimentation. The multi-layer rocks occur at various depths mainly in the conditions of three-axial nonuniform stress state. Occurrence conditions of multi-layer rocks such as shale and clay stone govern variability of their properties in different directions. Designing of underground structures in alternate-layer rocks involves determination of local stresses, and the stability of the structures is tested using the relevant strength criteria.

Keywords: rock stratification, geomechanical model, core, strength criteria, sample testing, degree of anisotropy, Brazilian test, borehole stability.
For citation:

Aliev M. M., Ismagilova Z. F., Burmistrova N. N. Geomechanical models of shear fracture of multi-layer rocks. MIAB. Mining Inf. Anal. Bull. 2020;(8):52-61. [In Russ]. DOI: 10.25018/0236-1493-2020-8-0-52-61.

Acknowledgements:
Issue number: 8
Year: 2020
Page number: 52-61
ISBN: 0236-1493
UDK: 622.240.8
DOI: 10.25018/0236-1493-2020-8-0-52-61
Article receipt date: 20.11.2019
Date of review receipt: 06.03.2020
Date of the editorial board′s decision on the article′s publishing: 20.07.2020
About authors:

M.M. Aliev1, Dr. Sci. (Eng.), Professor,
Z.F. Ismagilova1, Cand. Sci. (Eng.), Assistant Professor, e-mail: iiii.iskandar@inbox.ru,
N.N. Burmistrova1, Senior Lecturer, e-mail: nataliyavika@yandex.ru,
1 Almetyevst State Oil Institute, 423450, Almetyevsk, Tatarstan, Russia.

 

For contacts:

N.N. Burmistrova, e-mail: nataliyavika@yandex.ru.

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