Numerical study of the impact mechanism of decoupling charge on blasting-enhanced permeability in low-permeability sandstones

Yuan, Wei; Wang, Wei; Su, Xuebin; Li, Jiaxin; Li, Zonghong; Wen, Lei; Chang, Jiangfang

doi:10.1016/j.ijrmms.2018.04.029

Cited by 81 publications

(53 citation statements)

References 15 publications

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“…Tingting et al [10] numerically analyzed the attenuation law of stress waves through parallel cracks and obtained the relationship between the attenuation coefficient and the number of cracks. Yuan et al [11] obtained the method which changes the mineral's permeability via stress waves.…”

Section: Introductionmentioning

confidence: 99%

Attenuation Law of Stress Waves in Cracked Rock Mass under Different Confining Pressures

Lou

Luo

2019

Advances in Civil Engineering

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Through theoretical analysis and indoor model tests, this paper explores the attenuation law of stress waves in the intact confined rock mass and cracked rock mass under different confining pressures, especially the relationship between the stress attenuation coefficient, crack width, and crack angle, respectively. The tests were carried out on a triaxial test system for deep rock mass, which supports both static and dynamic loading. The research results show that the physical attenuation of the stress wave in the intact rock mass first decreases and then increases with the increase of the confining pressure and decreases with the increase of crack width. The attenuation coefficient of stress waves in the cracked rock mass depends on the crack angle and crack width. Specifically, the coefficient is negatively correlated with crack width; under no confining pressure, the coefficient decreases with the increase of the crack angle; when the confining pressure is on a moderate level, the coefficient increases with the crack angle; when the confining pressure exceeds the uniaxial intensity by 34%, the coefficient decreases again with the increase of the crack angle. The theoretical propagation equation of stress waves at the crack, which was derived from the propagation attenuation mechanism of stress waves in the cracked rock mass, was proved feasible through the comparison against the experimental results.

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Section: Introductionmentioning

confidence: 99%

Attenuation Law of Stress Waves in Cracked Rock Mass under Different Confining Pressures

Lou

Luo

2019

Advances in Civil Engineering

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“…Thus, the rock slope stability is controlled by these seven parameters: γ, H, β, σ c, GSI, D and m i . The equation of the MC criterion in principal stress space is expressed as (Yuan et al, 2018):…”

Section: Introductionmentioning

confidence: 99%

A rapid stability charts analysis method for rock slopes based on Generalized Hoek-Brown criterion

Yuan

Wang

Xing³

et al. 2021

All Earth

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Stability charts for slopes remain useful in engineering practice because of their convenience and practicality. This paper presents a new stability chart analysis method based on the Generalized Hoek-Brown (GHB) criterion to rapidly calculate the factor of safety (FOS) of rock slopes. First, critical failure state charts (CFSCs) are produced to represent the relationships among the slope height, unit weight of the rock mass and all the parameters involved in the GHB criterion when the slopes lead to a critical failure state (i.e. FOS = 1.0). Second, based on the CFSCs, the formulas of the FOS derived from m i and dimensionless parameter σ cmass /γH are presented for slopes with different slope angles. Thus, the FOS for any slope with a GHB rock mass can be directly determined by taking the GHB parameters (i.e. σ c , m i , GSI, and D), the unit weight (γ) and the slope's geometrical parameters (i.e. height H and slope angle β) as inputs. Finally, 25 cases selected from the published literature are used to illustrate the applicability and validity of the proposed method. The results for these cases show good agreement with those obtained with the limit equilibrium method (LEM).

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“…Investigating, realizing and thereby predicting hydraulic conductivity through explosively created fracture networks are of fundamental importance in geothermal energy resources (Austin and Leonard, 1973), in situ recovery of oil shale (Miller and Johansen, 1974; Miller and Johansen, 1976; Grady et al , 1980; McHugh and Keough, 1982), in situ coal gasification (Moody, 1978; Butkovich et al , 1979; Zhu et al , 2013; Zhu et al , 2016; Ye et al , 2017; Yang et al , 2019), in situ recovery of hydrocarbon and mineral resources (Carter, 1978; Adams et al , 1981), oil/gas well stimulation technologies (Eakin and Miller, 1967; McKee and Hanson, 1975; Li and Xue, 2000; Guo et al , 2014; Liu et al , 2018; Li et al , 2018; Li et al , 2018; Venkatesh et al , 2019; Hou et al , 2019), underground nuclear waste repositories (Jordan et al , 2015) and sandstone type uranium mines (Yuan et al , 2018). High-energy explosive fracturing has been shown to be more appropriate and cost effective than hydraulic fracturing for specific applications and has demonstrated more technical efficiency and productivity for extremely low permeability reservoirs (Guo et al , 2014; Li et al , 2018; Hou et al , 2019).…”

Section: Introductionmentioning

confidence: 99%

“…High-energy explosive fracturing has been shown to be more appropriate and cost effective than hydraulic fracturing for specific applications and has demonstrated more technical efficiency and productivity for extremely low permeability reservoirs (Guo et al , 2014; Li et al , 2018; Hou et al , 2019). Changes in permeability induced by explosion are a significant factor in the design of nuclear waste repositories in brittle rocks such as granite (Jordan et al , 2015; Yuan et al , 2018). Explosively created fracture networks are also desirable for their contributions to sustain long-term well productivity because of the extensive fracture coverage within the reservoir rocks (Yuan et al , 2018; Hou et al , 2019).…”

Section: Introductionmentioning

confidence: 99%

Topology and hydraulic permeability estimation of explosively created fractures through regular cylindrical pore network models

Gharehdash

Sainsbury

Barzegar

et al. 2021

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Purpose This research study aims to develop regular cylindrical pore network models (RCPNMs) to calculate topology and geometry properties of explosively created fractures along with their resulting hydraulic permeability. The focus of the investigation is to define a method that generates a valid geometric and topologic representation from a computational modelling point of view for explosion-generated fractures in rocks. In particular, extraction of geometries from experimentally validated Eulerian smoothed particle hydrodynamics (ESPH) approach, to avoid restrictions for image-based computational methods. Design/methodology/approach Three-dimensional stabilized ESPH solution is required to model explosively created fracture networks, and the accuracy of developed ESPH is qualitatively and quantitatively examined against experimental observations for both peak detonation pressures and crack density estimations. SPH simulation domain is segmented to void and solid spaces using a graphical user interface, and the void space of blasted rocks is represented by a regular lattice of spherical pores connected by cylindrical throats. Results produced by the RCPNMs are compared to three pore network extraction algorithms. Thereby, once the accuracy of RCPNMs is confirmed, the absolute permeability of fracture networks is calculated. Findings The results obtained with RCPNMs method were compared with three pore network extraction algorithms and computational fluid dynamics method, achieving a more computational efficiency regarding to CPU cost and a better geometry and topology relationship identification, in all the cases studied. Furthermore, a reliable topology data that does not have image-based pore network limitations, and the effect of topological disorder on the computed absolute permeability is minor. However, further research is necessary to improve the interpretation of real pore systems for explosively created fracture networks. Practical implications Although only laboratory cylindrical rock specimens were tested in the computational examples, the developed approaches are applicable for field scale and complex pore network grids with arbitrary shapes. Originality/value It is often desirable to develop an integrated computational method for hydraulic conductivity of explosively created fracture networks which segmentation of fracture networks is not restricted to X-ray images, particularly when topologic and geometric modellings are the crucial parts. This research study provides insight to the reliable computational methods and pore network extraction algorithm selection processes, as well as defining a practical framework for generating reliable topological and geometrical data in a Eulerian SPH setting.

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Numerical study of the impact mechanism of decoupling charge on blasting-enhanced permeability in low-permeability sandstones

Cited by 81 publications

References 15 publications

Attenuation Law of Stress Waves in Cracked Rock Mass under Different Confining Pressures

Attenuation Law of Stress Waves in Cracked Rock Mass under Different Confining Pressures

A rapid stability charts analysis method for rock slopes based on Generalized Hoek-Brown criterion

Topology and hydraulic permeability estimation of explosively created fractures through regular cylindrical pore network models

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