Interpretations on how the macroscopic mechanical behavior of sandstone affected by microscopic properties—Revealed by bonded-particle model

Hsieh, Yu‐Ming; Li, Hung-Hui; Huang, Tsan‐Hwei; Jeng, Fu‐Shu

doi:10.1016/j.enggeo.2008.01.017

Cited by 90 publications

(23 citation statements)

References 24 publications

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“…Note that to present a unified normalized UCS relationship for different rocks with different strength, it is common to use normalized strain rate (dynamic strain rate/reference strain rate) to define the relationship for normalized UCS (

σ_{ud}^{in} / σ_{us}^{in}

). In the current study, the reference strain rate ε r is equivalent to the quasi‐static strain rate of the rocks, which is consistent with previous studies . Based on the results shown in Figure , it was found that the strain rate has a very limited effect on UCS when it is below 0.1 s −1 .…”

Section: Simulation Methodology: Bpmsupporting

confidence: 91%

A particle mechanics approach for the dynamic strength model of the jointed rock mass considering the joint orientation

Zhou

Karakus

et al. 2019

Num Anal Meth Geomechanics

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Summary In nature, there exist several forms of anisotropy in rock masses due to the presence of bedding planes, joints, and weak layers. It is well understood that the anisotropic properties of jointed rock masses significantly affect the stability of surface and underground excavations. However, these critical anisotropic characteristics are often ignored in existing uniaxial dynamic failure criteria. This study investigates the effect of a pre‐existing persistent joint on the rate‐dependent mechanical behaviours of a rock mass using a particle mechanics approach, namely, bonded particle model (BPM), to realistically replicate the mechanical response of the rock mass. Firstly, in order to capture the rate‐dependent response of the jointed rock mass, the BPM model is validated using published experimental data. Then, a dynamic strength model is proposed based on the Jaeger criterion and simulation results. To further investigate the dynamic behaviours, the dynamic uniaxial compressive strength (UCS) for anisotropic rock masses with various joint orientations is investigated by subjecting the BPM models to uniaxial compression numerical tests with various strain rate. The proposed dynamic strength model is validated based on numerical simulation results. Finally, the fragmentation characteristics of the jointed rock masses are analysed, which demonstrate that the failure mode affects the dynamic UCS. This is further confirmed by the analysis of the orientations of microscopic cracks generated by the compression loading.

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σ_{ud}^{in} / σ_{us}^{in}

Section: Simulation Methodology: Bpmsupporting

confidence: 91%

A particle mechanics approach for the dynamic strength model of the jointed rock mass considering the joint orientation

Zhou

Karakus

et al. 2019

Num Anal Meth Geomechanics

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“…For this reason, a significant amount of previous research has been devoted to correlating unconfined compressive strength of sandstones with their index engineering properties, such as density, absorption, moisture content, porosity, and pore size distribution (Hoshino, 1974;Shakoor and Bonelli, 1991;Hawkins and McConnell, 1992;Haney and Shakoor, 1994;Ulusay et al, 1994;Palchick, 1999;and Hale and Shakoor, 2003), as well as with their reaction to such climatic changes as heating and cooling, wetting and drying, and freezing and thawing (Colback and Wiid, 1965;D'Andrea et al, 1965;Broch, 1974;Michalopoulos and Triandafilidis, 1976;Venkatappa Rao et al, 1985;and Bell, 1992). The effect of petrographic characteristics (grain size, grain shape, nature of grain-to-grain contacts, amount and type of matrix) on unconfined compressive strength of sandstones has also been studied extensively by various researchers (Fahy and Guccione, 1979;Winkler, 1986;Singh, 1988;Shakoor and Bonelli, 1991;Haney and Shakoor, 1994;Ulusay et al, 1994;Hale and Shakoor, 2003;and Hsieh et al, 2008).…”

Section: Introductionmentioning

confidence: 96%

Relationship between Unconfined Compressive Strength and Degree of Saturation for Selected Sandstones

Shakoor

Barefield

2009

Environmental and Engineering Geoscience

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Unconfined compressive strength of rocks is known to vary with changes in moisture content. However, previous studies report inconsistent results about this subject. The purpose of this study was to investigate the relationship between unconfined compressive strength and varying degrees of saturation for sandstone rocks and explain it in terms of index engineering properties and petrographic characteristics. Eighteen NX-size (2.125 inches or 5.4 cm in diameter) cores were prepared from each of the nine sandstones sampled from central Ohio through central Pennsylvania. Laboratory tests were conducted to determine absorption, dry density, specific gravity, and porosity values for each core. Cores were then tested for unconfined compressive strength at 0 percent, 20 percent, 40 percent, 60 percent, 80 percent, and 100 percent saturation. Statistical analyses were performed to determine the relationship between unconfined compressive strength and degree of saturation. The results indicate significant trends of unconfined compressive strength reduction with increasing degree of saturation and strength reductions of up to 71.6 percent between dry and saturated states. The trends are more consistent for high-strength sandstones than those for medium-to low-strength sandstones, which display less predictable behavior. Some sandstones show a majority of strength reduction occurring by 20 percent saturation, and minimal to indiscernible strength reductions at higher saturation levels. Based on these results, prediction equations were developed for sandstones, which were grouped into four classes on the basis of their absorption values. The input parameters required for the prediction equations include degree of saturation and one or more of the index engineering properties.

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“…The values of the global DEM parameters can be found using different procedures. Some authors [4,6,7] have used numerical experiments for determining the relationships between DEM and continuum parameters expressed in dimensionless form. This method has been used by the authors in previous works [9][10][11][12][17][18][19][20].…”

Section: Background On the Demmentioning

confidence: 99%

Application of an enhanced discrete element method to oil and gas drilling processes

Ubach

Arrufat

Ring³

et al. 2015

Comp. Part. Mech.

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The authors present results on the use of the discrete element method (DEM) for the simulation of drilling processes typical in the oil and gas exploration industry. The numerical method uses advanced DEM techniques using a local definition of the DEM parameters and combined FEM-DEM procedures.This paper presents a step by step procedure to build a DEM model for analysis of the soil region coupled to a FEM model for discretizing the drilling tool that reproduces the drilling mechanics of a particular drill bit. A parameter study has been performed to determine the model parameters in order to maintain accurate solutions with reduced computational cost.

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Interpretations on how the macroscopic mechanical behavior of sandstone affected by microscopic properties—Revealed by bonded-particle model

Cited by 90 publications

References 24 publications

A particle mechanics approach for the dynamic strength model of the jointed rock mass considering the joint orientation

A particle mechanics approach for the dynamic strength model of the jointed rock mass considering the joint orientation

Relationship between Unconfined Compressive Strength and Degree of Saturation for Selected Sandstones

Application of an enhanced discrete element method to oil and gas drilling processes

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