Volume 14 (2023)
Volume 13 (2022)
Volume 12 (2021)
Volume 11 (2020)
Volume 10 (2019)
Volume 9 (2018)
Volume 8 (2017)
Volume 7 (2016)
Volume 6 (2015)
Volume 5 (2014)
Volume 4 (2013)
Volume 3 (2012)
Volume 2 (2011)
Volume 1 (2010)
Rock Mechanics
Investigation of the of shear properties of open non-persistent latitudinal discontinuities of the same level

vahab sarfarazi; Hadi Haeri; Mohammad Fatehi Marji; Gholamreza Saeedi; Amir Namdarmanesh

Articles in Press, Accepted Manuscript, Available Online from 06 September 2023


  In this paper, the effect of variations in the number and area of the rock bridges on the non-persistent discontinuities is investigated. In this regard, blocks containing rock bridges and joints with dimensions of 15 cm * 15 cm * 15 cm are prepared from plaster. The available rock bridges that have ...  Read More

Analytical Solutions of First-order Displacement Discontinuity Elements in Poroelasticity

Mohammadhossein Dehghani Firoozabadi; Mohammad Fatehi Marji; Abolfazl Abdollahipour; Alireza Yarahamdi Bafghi; Yousef Mirzaeian

Volume 14, Issue 2 , April 2023, , Pages 601-618


  The presence of pores and cracks in porous and fractured rocks is mostly accompanied by fluid flow. Poroelasticity can be used for the accurate modeling of many rock structures in the petroleum industry. The approach of the stress to the value of the fracture stress and the effect of pore pressure on ...  Read More

Experimental Evaluation and Discrete Element Modeling of Shale Delamination Mechanism

Enayatallah Emami Meybodi; Syed Khaliq Hussain; Mohammad Fatehi Marji

Volume 14, Issue 1 , January 2023, , Pages 259-276


  In this research work, X-ray diffraction (XRD) tests and petrographic studies are performed to analyze the mineral composition and lamination in the shale rock specimens. Afterward, point load (PL) and uniaxial compressive strength (UCS) tests are carried out on the anisotropic laminated shale rock. ...  Read More

PFC Simulation of Brazilian Tensile Strength Test in Geomaterials’ Specimens with T-shaped Non-persistent Joints

Vahab Sarfarazi; Hadi Haeri; Fereshteh Bagheri; Erfan Zarrin ghalam; Mohammad Fatehi Marji

Volume 13, Issue 4 , October 2022, , Pages 1189-1209


  The tensile strengths of geomaterials such as rocks, ceramics, concretes, gypsum, and mortars are obtained based on the direct and indirect tensile strength tests. In this research work, the Brazilian tensile strength tests are used to study the effects of length and inclination angle of T-shaped non-persistent ...  Read More

Experimental Investigation on Deformation Behavior of Circular Underground Opening in Hard Soil using a 3D Physical Model

Jinwei Fu; M. R. Safaei; H. Haeri; V. Sarfarazi; M. Fatehi Marji; Leige Xu; A. Arefnia

Volume 13, Issue 3 , July 2022, , Pages 727-749


  In this work, the mechanical behavior of strata deformation due to drilling and surface loading is investigated using a 3D physical model. For this purpose, a scaled-down physical model is first designed. Then the tunnel drilling and support system are built. The subsidence experiments performed due ...  Read More

Simulation of Crack Propagation Mechanism in Porous Media using Modified linear Element Displacement Discontinuity Method

M.H. Dehghani Firoozabadi; M. Fatehi Marji; A. Abdollahipour; A.R. Yarahamdi Bafghi; Y. Mirzaeian

Volume 13, Issue 3 , July 2022, , Pages 903-927


  In this work, an effective methodology is introduced for simulation of the crack propagation in linear poroelastic media. The presence of pores and saturated cracks that can be accompanied by fluid flow makes the use of poroelastic media inevitable. In this work, involvement of the time parameter in ...  Read More

On Propagation Mechanism of Cracks Emanating from Two Neighboring Holes in Cubic Concrete Specimens under Various Lateral Confinements

M. Davood Yavari; H. Haeri; V. Sarfarazi; M. Fatehi Marji; H. A. Lazemi

Volume 12, Issue 4 , October 2021, , Pages 1003-1017


  The propagation mechanism of cracks emanating from two holes within the concrete specimens is studied by considering the effects of different lateral compressive stresses. The experimental part of this research work is carried out on some specially prepared pre-cracked specimens with two neighbouring ...  Read More

A Modified Indirect Boundary Element Analysis for Fatigue Behavior Assessment of Rock-Like Materials Based on Linear Elastic Fracture Mechanics

R. Alizadeh; M. Fatehi Marji; A. Abdollahipour; M. Pourghasemi Sagand

Volume 12, Issue 4 , October 2021, , Pages 1189-1203


  In this work, an effective methodology is introduced for modeling the fatigue crack propagation in linear elastic brittle media. The displacement discontinuity method is used to accomplish the analysis, and the boundaries are discretized with quadratic elements in order to predict the stress intensity ...  Read More

Compressive Failure Analyses of Rock-Like Materials by Experimental and Numerical Methods

M. Davood Yavari; H. Haeri; V. Sarfarazi; M. Fatehi Marji; H. A. Lazemi

Volume 12, Issue 3 , July 2021, , Pages 769-783


  Investigating the crack propagation mechanism is of paramount importance in analyzing the failure process of most materials. This process may be exposed during each kind of loading on the materials. In this work, the cracking mechanism in rock-like materials is studied using the numerical methods and ...  Read More

On Direct Tensile Strength Measuring of Anisotropic Rocks

V. Sarfarazi; H. Haeri; M. Fatehi Marji

Volume 12, Issue 2 , April 2021, , Pages 491-499


  The tensile strength of the anisotropic rock-like material specimens is meastred directly in the laboratory using a new device converting the compressive loading to that of the tensile before the rock breakage. The specially prepared concrete slabs of dimensions 19 cm * 15 cm * 15 cm with a central hole ...  Read More

Rock Mechanics
Hydraulic fracture propagation: analytical solutions versus Lattice simulations

E. Bakhshi; V. Rasouli; A. Ghorbani; M. Fatehi Marji

Volume 10, Issue 2 , April 2019, , Pages 451-464


  In this work, we used a grain-based numerical model based on the concept of lattice. The modelling was done to simulate the lab experiments carried out on the mortar samples. Also the analytical solutions corresponding to the viscosity-dominated regime were used to estimate the fracture length and width, ...  Read More

Behavior of a hydraulic fracture in permeable formations

A. Abdollahipour; M. Fatehi Marji; H. Soltanian; E. A. Kazemzadeh

Volume 9, Issue 4 , October 2018, , Pages 893-904


  The permeability and coupled behavior of pore pressure and deformations play an important role in hydraulic fracturing (HF) modeling. In this work, a poroelastic displacement discontinuity method is used to study the permeability effect on the HF development in various formation permeabilities. The numerical ...  Read More

A boundary element/finite difference analysis of subsidence phenomenon due to underground structures

S. E. Mirsalari; M. Fatehi Marji; J. Gholamnejad; M. Najafi

Volume 8, Issue 2 , April 2017, , Pages 237-253


  Analysis of the stresses, displacements, and horizontal strains of the ground subsidence due to underground excavation in rocks can be accomplished by means of a hybridized higher order indirect boundary element/finite difference (BE/FD) formulation. A semi-infinite displacement discontinuity field is ...  Read More

Rock mass structural data analysis using image processing techniques (Case study: Choghart iron ore mine northern slopes)

M. Mohebbi; A.R. Yarahmadi Bafghi; M. Fatehi Marji; J. Gholamnejad

Volume 8, Issue 1 , January 2017, , Pages 61-74


  Presence of joints and fractures in rocks strongly influences the behavior of the rock mass by dividing the media into smaller units. These structures intensify the potential instability besides the development of sliding and rotational movements. The assumption of discontinuum media changes the whole ...  Read More

Numerical investigation of effect of crack geometrical parameters on hydraulic fracturing process of hydrocarbon reservoirs

A. Abdollahipour; M. Fatehi Marji; A. R. Yarahmadi Bafghi; J. Gholamnejad

Volume 7, Issue 2 , July 2016, , Pages 205-214


  Hydraulic fracturing (HF), as a stimulation technique in petroleum engineering, has made possible the oil production from reservoirs with very low permeability. The combination of horizontal drilling and multiple HF with various perforation angles has been widely used to stimulate oil reservoirs for ...  Read More

A boundary element analysis of crack-propagation mechanism of micro-cracks in rock-like specimens under a uniform normal tension

H. Haeri; A. R Khaloo; K. Shahriar; M. Fatehi Marji; P. Moaref vand

Volume 6, Issue 1 , January 2015, , Pages 73-93


  In this work, the mechanism for fracture of brittle substances such as rocks under a uniform normal tension is considered. The oriented straight micro-cracks are mostly created in all the polycrystalline materials resulting from the stress concentrations. The present work focuses on the interactions ...  Read More