Influences of pore pressure on short-term and creep mechanical behavior of red sandstone

Yang, Sheng‐Qi; Jing, Hongwen; Cheng, Long

doi:10.1016/j.enggeo.2014.06.016

Cited by 124 publications

(65 citation statements)

References 17 publications

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“…The nonlinear deformation caused by the compressive closure of pre-existing microcracks is not obvious in the stress-strain curves, but the permeability decreases markedly. The mechanical behavior of rock during multi-loading creep tests was observed in a number of previous studies (Maranini and Brignoli 1999;Tsai et al 2008;Yang et al 2014). Three stages can be identified in the evolution of the deviatoric stress level: the primary creep stage with a decreasing strain rate; the steady creep stage at a constant strain rate; and the accelerated creep stage where the strain rate increases until failure of the specimen.…”

Section: Permeability Evolution During Time-dependent Deformationmentioning

confidence: 92%

Permeability Evolution of Granite Gneiss During Triaxial Creep Tests

Liu

Wang

et al. 2016

Rock Mech Rock Eng

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Permeability is an important factor for seepage analysis of rock material, and a key factor in ensuring the safety of underground works. In this study, the permeability evolution of granite gneiss during triaxial creep tests was investigated. In the context of an underground oil storage cavern in China, a series of hydro-mechanical coupling creep tests were conducted on rock cores of granite gneiss at three different pore pressures to reveal the effect of pore pressure on the permeability evolution and to investigate the correlation between the permeability and volumetric strain during the creep process. During the creep tests, the permeability decreases in the initial loading phase. At all deviatoric stress levels, the permeability remains stable in the steady creep stage and increases rapidly in the accelerated creep stage. Based on the test data, the initial permeability, steady permeability and peak permeability at various stress levels are defined. The effect of pore pressure on the permeability is captured by a linear model. In addition, the relationship between permeability and volumetric strain can be described as a process divided into three phases, with different functions in each phase.

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Section: Permeability Evolution During Time-dependent Deformationmentioning

confidence: 92%

Permeability Evolution of Granite Gneiss During Triaxial Creep Tests

Liu

Wang

et al. 2016

Rock Mech Rock Eng

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“…In the past, the strength, deformation, failure and time-dependent behavior of sandstone have been reported in a number of experimental studies (Wu et al, 2007;Klein et al, 2001;B esuelle et al, 2003;Feng et al, 2004;Fortin et al, 2006;Tembe et al, 2008;Tsai et al, 2008;Yang et al, 2008;Heap et al, 2009b;Park and Bobet, 2009;Tavallali and Vervoort, 2010;Heap et al, 2010;Xu et al, 2012;Song et al, 2013;Wasantha and Ranjith, 2014;Yang et al, 2014b). For example, Khan et al (1991) conducted a lot of triaxial compression experiments on Berea sandstone under a large range of confining pressure, determined the initial yield and failure surfaces, and proposed a yield and failure criteria.…”

Section: Introductionmentioning

confidence: 96%

“…Wasantha and Ranjith (2014) investigated the effect of water on the short-term mechanical behavior of intact Hawkesbury sandstone, and showed that water could reduce the peak strength of sandstone. Yang et al (2014b) analyzed quantitatively the influence of pore fluid pressure and axial deviatoric stress on the creep mechanical behavior of saturated red sandstone. The results showed that the steady-state creep rate of saturated red sandstone increased nonlinearly but the viscosity coefficient decreased gradually with increasing axial deviatoric stress and pore fluid pressure.…”

Section: Introductionmentioning

confidence: 99%

Fracture mechanical behavior of red sandstone containing a single fissure and two parallel fissures after exposure to different high temperature treatments

Yang

Jing

Huang

et al. 2014

Journal of Structural Geology

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“…This influence has been investigated through experimental and theoretical [27,28,31,32] and numerical modeling [33]. Some researchers considered the influence of pore pressure on the creep mechanical behavior [34,35]. However, these studies have improved our understanding on the time-dependent influence on rock mass, we still should know its influence on dual-porosity, dual-permeability system with important coupling between mechanical and fluid-flow transport behaviors.Therefore, the focus of this paper is to investigate the time-dependent response to coupled hydro-mechanical with dual-porosity, dual-permeability medium.…”

mentioning

confidence: 99%

Investigation on Coupled Fluid-Flow and Stress in Dual Model Rock Mass with Time-Dependent Effect and Its Simulation

Zhao

Zhang

et al. 2017

Geosciences

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The coupled fluid-flow and stress model with time-dependent effect is developed. In this model, rock mass is simulated as a homogeneous and isotropic dual-porosity, dual-permeability continuum. Darcy's law is used to describe the fluid flow in a porous medium, and cubic law is used to describe the flow in fractures. The finite element method is introduced to solve the system, and the effects of fractures and fracture spacing are considered numerically. The numerical results indicate that fractures have a significant impact on the rocks' displacement and pore pressure. It also shows an increase in plastic strain with decreasing fracture spacing, as does the creep strain. The coupled process is highly sensitive to the fracture spacing. A series of numerical simulations are conducted to better understand the complex coupled processes, which leads to an improved understanding of different aspects of naturally fractured reservoirs and may impact on experimental design to explore these attributes in a real reservoir situation. on modeling fractured formations with the dual-porosity, dual-permeability approach [5,[15][16][17][18]. Some researchers followed the conventional fluid flow modeling coupled with geomechanics through stress dependent rock properties and during the development process [19][20][21]. Considering pore deformation, Valliappan and Khalili-Naghadeh [20] derived a set of coupled differential equations governing the behaviour of fissured porous media. Chen and Teufel [19] focused on theoretical developments with emphasis on the identification of the critical coupling and physical interpretations of the parameters involved. Taking advantage of the joint-mechanics theory, Bagheri and Settari [21] developed general, rigorous coupling between the fluid-flow equation and deformation of fractured media. The need for coupled modeling of hydro-mechanical model has been addressed and investigated in various studies whether the analytical and numerical modelling [22][23][24][25]. For example, Zhang et al. [22] used the finite element method to investigate the effects of fracture spaces on the displacement, stress and pressure in dual-porosity media. However, they neglected the matrix-fracture interaction transfer function. Rutqvist [23] proposed a linked multicontinuum and crack tensor approach for modelling of coupled geomechanics, fluid flow and transport in fractured rock. Hu et al.[25] used a numerical manifold method for analyzing fully coupled hydro-mechanical processes in porous masses with discrete fractures. Some even considered the chemo-hydro-mechanical model for the coupled multiphysics of carbon dioxide sequestration [10,11].Although all of these works provide better extension to the existence theory and models, the long-term creep effect on the matrix with coupled fields is seldom considered. In practice, the time-dependent effect has a great impact on the characteristics of rock material and the stability of rock engineering, such as deep underground rock engineering, high slope engineering, dam ba...

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Influences of pore pressure on short-term and creep mechanical behavior of red sandstone

Cited by 124 publications

References 17 publications

Permeability Evolution of Granite Gneiss During Triaxial Creep Tests

Permeability Evolution of Granite Gneiss During Triaxial Creep Tests

Fracture mechanical behavior of red sandstone containing a single fissure and two parallel fissures after exposure to different high temperature treatments

Investigation on Coupled Fluid-Flow and Stress in Dual Model Rock Mass with Time-Dependent Effect and Its Simulation

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