Evaluation of water saturation effect on mechanical properties and hydraulic fracturing behavior of granite

Zhuang, Łi; Kim, Kwang Yeom; Diaz, Melvin; Yeom, Sun

doi:10.1016/j.ijrmms.2020.104321

Cited by 42 publications

(26 citation statements)

References 37 publications

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“…The simulation results are in good qualitative agreement with laboratory tests performed by Zhuang et al 81 . They investigated experimentally the influence of water saturation on the mechanical properties of granite.…”

Section: Coupled Dem/cfd Simulation Resultssupporting

confidence: 83%

“…The simulation results are in good qualitative agreement with laboratory tests performed by Zhuang et al 81 They investigated experimentally the influence of water saturation on the mechanical properties of granite. They demonstrated that the fluid infiltration and fluid pressure were both affected by the initial saturation condition during hydraulic fracturing.…”

Section: Effect Of Initial Gas-phase Fraction In Rocksupporting

confidence: 82%

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Effect of gas content in macropores on hydraulic fracturing in rocks using a fully coupled DEM/CFD approach

Krzaczek

Nitka

Tejchman

2020

Num Anal Meth Geomechanics

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The paper focuses on the effect of the gas content in rock macropores on a hydraulic fracturing process. The process was simulated by combining the discrete element method (DEM) with computational fluid dynamics (CFD) under two‐dimensional (2D) isothermal conditions. The mechanical behavior of the rock matrix was simulated with DEM, and CFD was used for describing the behavior of laminar two‐phase fracturing fluid (liquid and gas) flow in pre‐existing and newly developed fractures. Geometry changes of pores and fractures in the rock matrix were precisely reproduced. Fully coupled hydro‐mechanical simulation tests were carried out with a rock segment of simplified particulate mesostructure under plane strain compression. The rock segment contained one or two injection slots. The effect of the initial gas‐phase content in macropores on the propagation of hydraulic fractures was estimated in numbers for different initial rock porosities. In addition, the influence of different pre‐existing discontinuities in the rock segment was studied. The main characteristics of a fractured rock segment due to a high‐pressure fluid injection were realistically reproduced with a proposed approach. The initial gas‐phase fraction in macropores and pre‐existing discontinuities were found to be strongly influential in the course of hydraulic fracturing.

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Section: Coupled Dem/cfd Simulation Resultssupporting

confidence: 83%

Section: Effect Of Initial Gas-phase Fraction In Rocksupporting

confidence: 82%

Effect of gas content in macropores on hydraulic fracturing in rocks using a fully coupled DEM/CFD approach

Krzaczek

Nitka

Tejchman

2020

Num Anal Meth Geomechanics

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“…The influence of pore fluids on the bulk properties of a poroelastic material are well established (Biot, 1962). A recent lab study shows that water saturation state also influences the initiation and propagation of hydraulic fractures in granite, with higher AE count before and after breakdown in the saturated samples compared to unsaturated samples (Zhuang et al, 2020). For upscaling results of this study, these effects should therefore be considered.…”

Section: Discussionmentioning

confidence: 93%

Characterization of damage processes in Montney siltstone under triaxial compression using acoustic emission and diagnostic imaging

Jia

Wong

Eaton

2021

Geophysical Journal International

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Summary Crack nucleation and rock failure processes in a fine-grained siltstone (Montney Formation) under triaxial compression are investigated using combined diagnostic techniques, including ultrasonic-wave measurement, acoustic-emission (AE) monitoring, computed tomography (CT) scanning, and thin-section imaging. The sample displays a weak-to-moderate inherent seismic anisotropy and noticeable stress-induced anisotropy prior to failure. No AE event was detected until the applied axial stress reached 95 per cent of the peak value. The signal-to-noise ratio is relatively low, however, and detectable AE events are more diffuse than those observed in highly brittle rocks. The AE locations correlate with a shear fracture zone imaged by CT scanning. AE moment-tensor analysis reveals that events with larger relative magnitudes are characterized by high volumetric (tensile or compressive) components, and the initiation of the failure zone is dominated by combined shear-tensile failure. Stress inversion of the AE events with high tensile components is in good agreement with the known applied stress. Microscopic imaging of thin sections from the failed sample shows that the failure zone is an en echelon structure consisting of a major fracture with branching micro and minor cracks. This failure mechanism is consistent with a shear-tensile source mechanism and is interpreted to be associated with the fine granular structure and mineral composition of Montney siltstone.

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“…Referring to the related research results in the field of rock mechanics [38][39], this study used exponential, logarithmic, and power functions to fit and analyze the relationship between the CPB strength and water saturation. The results are shown in Figure 6.…”

Section: Influence Of Water Saturation On Strengthmentioning

confidence: 99%

Influence of water saturation on the strength characteristics and deformation behavior of hardened cement paste backfill

Wang

2021

Preprint

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In this study, a uniaxial compression experimental was conducted to examine the mechanical properties of hardened cemented paste backfill (CPB) with different water saturations (0.18%, 4.98%, 9.30%, 21.6%, 32.8%, and 100%). The experimental results demonstrated that water saturation loosened the overall structure of the CPB, which led to the deterioration of its mechanical properties. As the water saturation increased, the uniaxial compressive strength (UCS), residual strength, strength difference, deformation modulus, secant modulus, E50 (the secant modulus at 50% of the UCS), peak strain, and elastic strain decreased, while the plastic strain ratio increased. The UCS, E50, and peak strain demonstrated exponential function relationships with the water saturation. After the peak point, when the water saturation was less than 20%, the strength of the CPB decreased rapidly, and when the water saturation was greater than 30%, the strength decreased slowly. Lastly, the plastic strain, the strain at 50% of the UCS, and the strain at the maximum secant modulus conformed to the normal distribution, and the water saturation had a minimal impact on these three strains. The fractal dimension, D, of the cracks in the CPB increased exponentially with increasing water saturation and demonstrated a negative linear correlation with the UCS.

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Evaluation of water saturation effect on mechanical properties and hydraulic fracturing behavior of granite

Cited by 42 publications

References 37 publications

Effect of gas content in macropores on hydraulic fracturing in rocks using a fully coupled DEM/CFD approach

Effect of gas content in macropores on hydraulic fracturing in rocks using a fully coupled DEM/CFD approach

Characterization of damage processes in Montney siltstone under triaxial compression using acoustic emission and diagnostic imaging

Influence of water saturation on the strength characteristics and deformation behavior of hardened cement paste backfill

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