Laboratory observation and numerical simulation of permeability evolution during progressive failure of brittle rocks

Tan, Xiaolu; Konietzky, Heinz; Frühwirt, Thomas

doi:10.1016/j.ijrmms.2014.02.016

Cited by 49 publications

(14 citation statements)

References 18 publications

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“…With the aid of multiscale observations during physical experiments, it is clear that fracture evolution in rock is a transscale process of progressive damage accumulation. Therefore, multiscale continuum damage mechanics models (Tang 1997;Fang and Harrison 2002;Liu et al 2004;Feng et al 2006;Zhang and Ge 2007;Ma et al 2011;Shen et al 2012;Lu et al 2013;Tan et al 2014) have been widely applied in simulation of crack initiation, growth, propagation, and coalescence in heterogeneous rock, owing to its capability in reproducing the degraded macroscopic properties of rock materials. It is worth noting that these models are based on the concept of representative volume element (RVE) [also called the representative elementary volume (REV) or the unit cell], which is the smallest volume over which a measurement can be made that will yield a value (Bahat et al 2001) and c, d rectangular prism samples (Li et al 2011) representative of the whole (Kanit et al 2003;Zhang et al 2013).…”

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confidence: 99%

“…The mesh has to be fine enough to allow ''free'' propagation of cracks. Many numerical results of RVE-based models (Tang 1997;Liu et al 2004;Feng et al 2006;Pan et al 2009;Li and Wong 2012;Tan et al 2014) indicate that a smooth and refined crack propagation path can only be obtained with a small RVE size. On the contrary, if the RVE size is too large, the simulated crack propagation path can be very coarse and appears undulating.…”

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confidence: 99%

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Morphologic Interpretation of Rock Failure Mechanisms Under Uniaxial Compression Based on 3D Multiscale High-resolution Numerical Modeling

Liang

Tang

2014

Rock Mech Rock Eng

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Multiscale continuous laboratory observation of the progressive failure process has become a powerful means to reveal the complex failure mechanism of rock. Correspondingly, the representative volume element (RVE)-based models, which are capable of micro/meso-to macro-scale simulations, have been proposed, for instance, the rock failure process analysis (RFPA) program. Limited by the computational bottleneck due to the RVE size, multiscale high-resolution modeling of rock failure process can hardly be implemented, especially for three-dimensional (3D) problems. In this paper, the self-developed parallel RFPA 3D code is employed to investigate the failure mechanisms and various fracture morphology of laboratory-scale rectangular prism rock specimens under unconfined uniaxial compression. The specimens consist of either heterogeneous rock with low strength or relatively homogeneous rock with high strength. The numerical simulations, such as the macroscopic fracture pattern and stressstrain responses, can reproduce the well-known phenomena of physical experiments. In particular, the 3D multiscale continuum modeling is carried out to gain new insight into the morphologic interpretation of brittle failure mechanisms, which is calibrated and validated by comparing the actual laboratory experiments and field evidence. The advantages of 3D multiscale high-resolution modeling are demonstrated by comparing the failure modes against 2D numerical predictions by other models. The parallel RVEbased modeling tool in this paper can provide an alternative way to investigate the complicated failure mechanisms of rock.

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confidence: 99%

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confidence: 99%

Morphologic Interpretation of Rock Failure Mechanisms Under Uniaxial Compression Based on 3D Multiscale High-resolution Numerical Modeling

Liang

Tang

2014

Rock Mech Rock Eng

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“…The average flow velocity through the soil mass has been estimated from the test data using the following correlation: (7) where, v j is the average flow velocity and h j and t j are the values of h and t at j th instant respectively. The values of v and i computed above from the observed test data are plotted, as shown in Fig.5.…”

Section: Analysis and Interpretationmentioning

confidence: 99%

“…Wang et al [5] carried out experimental investigations through natural porous medium at low Reynold's number under different hydraulic heads. Experimental investigation on nonlinear groundwater flow was done by Zhang et al [6] and Tan et al [7]. Numerical modelling to assess the flow of water through porous medium under linear and non-linear conditions was carried out by several researchers [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Flow Characteristics through Saturated Soil: Experimental Study

Basack¹,

Goswami

Deka³

et al. 2020

Wseas Transactions on Environment and Development

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The flow characteristics through saturated soil is complex. For low heads, the flow is essentially linear, where Darcy’s law is applicable. For higher head, the flow is nonlinear and mathematically identified as Forchheimer’s flow. The critical flow velocity for this transition and the relevant Reynold’s number depends upon several factors, including soil and fluid characteristics. In this paper, an experimental investigation has been carried out by means of falling head permeameter with locally available soft soil sample. A critical analysis and interpretations of the test results to identify the linear and nonlinear flow characteristics have been performed and important conclusions are drawn therefrom.

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“…Furthermore, some researches on the permeability evolution of rocks under hydromechanical coupling conditions have been discussed, Tan et al [5] conducted seepage tests on the granite to describe the permeability evolution during the progressive failure process, which replicated the complex hydromechanical coupled behavior of low porous rocks, and Wang and Xu [6] carried out the permeability tests on limestone and sandstone during the course of deformation and failure; accordingly, the permeability evolution curves were divided into four phases of elastic compression phase, compression stability stage, dramatic increase phase of permeability, and postpeak phase, which is important for research on the permeability variation under multiphysical coupling conditions. Meanwhile, some experiments about the permeability of rocks with other physical properties have been investigated; Zeng et al [7] measured the mudstone permeability, showing a high stress sensitivity during loading of effective confining pressure, and Zhang [8] discussed the stress-strain permeability behavior of the claystone during damage process, both indicating that mud or clay components will greatly influence the rock permeability, which is useful to understand the permeability of the reservoir sandstone with mud.…”

Section: Geofluidsmentioning

confidence: 99%

Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties

Liu

Wang

2018

Geofluids

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Permeability of sandstones with different properties taken from Chongqing reservoirs has been measured and deeply discussed under increasing deviatoric stress. Corresponding to the distinct features in the stress-strain behaviors, the permeability of sandstones is found to evolve with a clear permeability decrease in the initial closure region, a constant permeability value in the elastic region, a permeability increase in the crack initiation and propagation region, a sharp permeability increase in the crack growth region, and a decrease permeability in the residual stage. The results also show that the variation patterns of permeability are similar for two reservoir sandstones under combination of confining pressure and water pressure; however, the strength and permeability are smaller for the sandstone with mud than that without mud, deeply indicating that mud-like materials have a relatively great impact on the mechanical properties and permeability, so mud components cannot be ignored for prediction of reservoir permeability. Furthermore, a statistical damage constitutive model considering hydraulic-mechanical coupling process is presented to calculate the damage variable , illustrating that larger water pressure will result in a relatively smaller damage variables and corresponding maximum, which explains that the permeability increases more rapidly and is larger for the sandstone without mud than that with mud, and sandstone damage related to corresponding circumferential crack strain and permeability has been investigated, also implying the evolution mechanism of permeability for two sandstones with different physical properties. Therefore, it is worth pointing out that rock physical properties have a great influence on the reservoir permeability under complex extraction conditions and cannot be ignored, which is necessary to improve the recovery ratio and productivity.

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Laboratory observation and numerical simulation of permeability evolution during progressive failure of brittle rocks

Cited by 49 publications

References 18 publications

Morphologic Interpretation of Rock Failure Mechanisms Under Uniaxial Compression Based on 3D Multiscale High-resolution Numerical Modeling

Morphologic Interpretation of Rock Failure Mechanisms Under Uniaxial Compression Based on 3D Multiscale High-resolution Numerical Modeling

Flow Characteristics through Saturated Soil: Experimental Study

Mechanism of Permeability Evolution for Reservoir Sandstone with Different Physical Properties

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