Comparison of discrete and equivalent continuum approaches to simulate the mechanical behavior of jointed rock masses

2016 ◽  
pp. 255-262
Author(s):  
N González ◽  
P Vargas ◽  
I Carol ◽  
K Das ◽  
S Sandha ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Jointed Rock ◽  
Rock Masses ◽  
Jointed Rock Masses ◽  
Equivalent Continuum

scholarly journals Determination of representative elementary volume (REV) for jointed rock masses exhibiting scale-dependent behavior: A numerical investigation

2021 ◽  
Author(s):  
Mehmet Sari
Keyword(s):  
Jointed Rock ◽  
Representative Elementary Volume ◽  
Elementary Volume ◽  
Rock Masses ◽  
Continuum Approach ◽  
Joint Spacing ◽  
Jointed Rock Masses ◽  
Equivalent Continuum ◽  
Equivalent Continuum Approach

Abstract Representative elementary volume (REV) is defined as the usual size of a rock mass structure beyond which its mechanical properties are homogenous and isotropic, and its behavior can be modeled using the equivalent continuum approach. Determination of REV is a complex problem in rock engineering due to its definition ambiguity and application area. This study is one of the first attempts to define a REV for jointed rock masses using the equivalent continuum approach. It is aimed to numerically search a ratio between the characteristic size of an engineering structure and pre-existing joint spacing, which are the two most important contributing elements in assessing REV. For this purpose, four hypothetical engineering cases were investigated using the RS2 (Phase2 v. 9.0) finite element (FE) analysis program. An underground circular opening with a constant diameter, an open-pit mine with varying bench heights, a single bench with a constant height, and an underground powerhouse cavern with a known dimension were executed for possible changes in the safety factor and total displacement measurements under several joint spacing values. Different cut-off REVs were calculated for FE models depending on the type of excavation and measurement method. An average REV size of 19.0, ranging between a minimum of 2 for tunnels and a maximum of 48 for slopes, was found in numerical analysis. The calculated sizes of REV were significantly larger than the range of values (5 to 10) commonly reported in the relevant geotechnical literature.

A numerical study on mechanical behavior of jointed rock masses after tunnel excavation

2020 ◽  
Vol 13 (11) ◽  
Author(s):  
Wanzhi Zhang ◽  
Bangshu Xu ◽  
Jie Mei ◽  
Guangyao Yue ◽  
Weihang Shi
Keyword(s):  
Mechanical Behavior ◽  
Numerical Study ◽  
Jointed Rock ◽  
Rock Masses ◽  
Tunnel Excavation ◽  
Jointed Rock Masses

scholarly journals The Effect of Joint Dip Angle on the Mechanical Behavior of Infilled Jointed Rock Masses under Uniaxial and Biaxial Compressions

Processes ◽  
2018 ◽  
Vol 6 (5) ◽  
pp. 49 ◽  
Author(s):  
Guansheng Han ◽  
Hongwen Jing ◽  
Yujing Jiang ◽  
Richeng Liu ◽  
Haijian Su ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Jointed Rock ◽  
Rock Masses ◽  
Jointed Rock Masses ◽  
Dip Angle

Numerical Study of the Mechanical Behavior of Nonpersistent Jointed Rock Masses

2016 ◽  
Vol 16 (1) ◽  
pp. 04015035 ◽  
Author(s):  
M. Bahaaddini ◽  
P. Hagan ◽  
R. Mitra ◽  
B. K. Hebblewhite
Keyword(s):  
Mechanical Behavior ◽  
Numerical Study ◽  
Jointed Rock ◽  
Rock Masses ◽  
Jointed Rock Masses

Evaluation of Deformation Modulus for the Jointed Rock Masses Using Equivalent Continuum Approach

2018 ◽  
Vol 877 ◽  
pp. 200-213 ◽  
Author(s):  
Rahul Khanna ◽  
Imran Sayeed ◽  
Rajendra Kr. Dubey
Keyword(s):  
Deformation Modulus ◽  
Jointed Rock ◽  
Field Investigation ◽  
Engineering Properties ◽  
Rock Masses ◽  
Empirical Relationships ◽  
Engineering Structures ◽  
Jointed Rock Masses ◽  
Underground Caverns ◽  
Equivalent Continuum

The rock masses are intercepted by several geological discontinuities that make them different from other engineering materials. The response of rock masses during excavation of ground for development of large engineering structures such as dams, tunnels, underground caverns etc. is very complicated. As the engineering structures are significantly larger than the rock blocks with discontinuities, therefore the rock masses may be represented in form of an equivalent continuum. Rock masses in this form are being utilized to determine important engineering properties such as compressive strength and modulus of deformation by means of empirical relationships. These properties have been used as an alternative for in-situ testing for designing of engineering structures. This paper evaluates the deformation modulus (Ed) of jointed rock masses by means of various available relationships for three rock types namely metavolcanics, dolomite and slate occurring extensively in Lesser Himalayan region of northern India. The determined empirical results are validated with the field investigation outputs. An attempt has also been made to work out new empirical relationships based on the field results.

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