Numerical Simulation of Water–Silt Inrush Hazard of Fault Rock: A Three-Phase Flow Model

Ma, Dexin; Duan, Hongyu; Zhang, Jixiong; Liu, Xianwei; Li, Zhenhua

doi:10.1007/s00603-022-02878-9

Cited by 94 publications

(35 citation statements)

References 37 publications

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“…Based on the two motion modes (i.e., particle movement and collision), the rock erosion process was simulated under different particle sizes, initial flow rates and adhesion forces. Constructing a water-sediment two-phase flow resistance model, Ma et al (2020b;2022b) studied the effects of different factors on the water-sediment inrush. It is found that the friction between the sediment grains and the fracture surface is the main source of the drag force on the sediment grains (see Fig.…”

Section: Modelling and Numerical Studymentioning

confidence: 99%

A state-of-the-art review on rock seepage mechanism of water inrush disaster in coal mines

Duan

Zhang

et al. 2022

Int J Coal Sci Technol

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Water inrush is one of the most dangerous disasters in coal mining. Due to the large-scale mining and complicated hydrogeological conditions, thousands of deaths and huge economic losses have been caused by water inrush disasters in China. There are two main factors determining the occurrence of water inrush: water source and water-conducting pathway. Research on the formation mechanism of the water-conducting pathway is the main direction to prevent and control the water inrush, and the seepage mechanism of rock mass during the formation of the water-conducting pathway is the key for the research on the water inrush mechanism. This paper provides a state-of-the-art review of seepage mechanisms during water inrush from three aspects, i.e., mechanisms of stress-seepage coupling, flow regime transformation and rock erosion. Through numerical methods and experimental analysis, the evolution law of stress and seepage fields in the process of water inrush is fully studied; the fluid movement characteristics under different flow regimes are clearly summarized; the law of particle initiation and migration in the process of water inrush is explored, and the effect of rock erosion on hydraulic and mechanical properties of the rock media is also studied. Finally, some limitations of current research are analyzed, and the suggestions for future research on water inrush are proposed in this review.

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Section: Modelling and Numerical Studymentioning

confidence: 99%

A state-of-the-art review on rock seepage mechanism of water inrush disaster in coal mines

Duan

Zhang

et al. 2022

Int J Coal Sci Technol

Self Cite

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“…Since the Hungarian scholar Ribicic [9] first proposed the concept of relative water-resisting rock thickness in 1994, many scholars have carried out a series of theoretical researches on the safety thickness of tunnel outburst prevention, forming some theoretical research methods such as fluid-structure coupling theory, analytic hierarchy process (AHP), fuzzy mathematics, and the limit analysis principle. Liu et al [10] and Ma et al [8] established a coupled seepage-erosion water inrush model, and based on the theory of fluid dynamics, they revealed the seepage-erosion mechanism of antioutburst rock mass. Based on the AHP, Xue et al [11] established the risk assessment model of tunnel water inrush in fault fracture zone, and they found that the surrounding rock grade, permeability coefficient, overburden thickness, tunnel section and construction technology, etc.…”

Section: Introductionmentioning

confidence: 99%

Research on the Safety Thickness of Tunnel Outburst Prevention in Water-Rich Fault Fracture Zone Based on Janssen’s Theory

Zhong

Zhou

2022

Geofluids

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In the construction of tunnel in water-rich fault fracture zone, when the thickness of outburst prevention is insufficient, it is very easy to cause water and mud inrush engineering accident. Therefore, it is very necessary to study the safety thickness of outburst prevention for this type of tunnel. In this paper, the expression of in situ stress in water-rich fault fracture zone is derived based on Janssen’s theory. Two mechanical models of outburst prevention rock mass are established, and according to the shear balance theory, the calculation formula for the safe thickness of outburst prevention is determined and the parameter sensitivity analysis is carried out. Finally, it is verified by engineering examples and numerical simulation. The results show that: (1) the calculation formula of outburst prevention thickness proposed in this paper is more perfect and shows good prediction effect for deep- and shallow-buried tunnels; (2) the greater the angle α between tunnel axis and fault zone and the dip θ of fault fracture zone, the smaller the critical safety thickness of outburst prevention and the safer it is for tunnel construction; (3) when the fault fracture zone inclines inward relative to the tunnel face, the gravity of the rock mass in the fault zone will lead to an increase in the safety thickness of outburst prevention, and reinforcement measures should be taken during actual construction.

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“…Some theoretical and field experimental studies on fracturing or penetration fracturing through a coal seam roof have been carried out. To date, the related research focuses on the effects of fracturing parameters and perforation parameters on crossing layer fracture propagation [12][13][14][15], optimization of development technology of horizontal wells in a coal seam roof [16,17], fracture initiation pressure of a coal seam or coal seam roof [18,19], properties of different roof rocks of a coal seam [20], fracture characteristics of rock mass during mining [21][22][23], and the effects of coal mechanical parameters on proppant embedding [24,25]. However, few studies on favorable geological conditions suitable for fracturing through horizontal wells in a coal seam roof have been reported.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Investigation on Fracture Propagation of Fracturing for Crossing Coal Seam Roof

Xiao

Wang

2022

Processes

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The fracturing crossing coal seam roof is a technology that fulfills the fracturing of a coal seam through the vertical propagation of fractures. Geological conditions are the key factors determining the effect of this kind of fracturing, but there is hardly any research on this aspect. To determine the favorable geological conditions for through-roof fracturing, based on a 3D fracture propagation model, and considering the interlayer vertical fracture toughness and leak-off heterogeneity, a mathematical model of fracturing through a horizontal well in a coal seam roof was established, and the calculation method of fractures crossing layer propagation was determined. In this method, the effect of fracture communication with the coal seam is evaluated by taking the area and the area ratio of fractures in the coal seam as the objective functions. The effects of parameters such as in situ stress combination profile, coal seam fracture toughness, and fluid loss coefficient on fracturing results were evaluated. The reasonable distance from the horizontal well to the coal seam’s top surface was determined in this work. The study results show that: (i) the fracturing effect is better when the coal seam is lower in in situ stress; (ii) the distance between the horizontal well and the top surface of the coal seam is recommended to be less than 4 m to obtain the ideal fracturing effect; and (iii) the combination of the in situ stress profile is the key factor, and the fracture toughness and fluid loss coefficient of the coal seam, fluid viscosity, and the number of perforations in one cluster are the secondary factors affecting the fracturing effect.

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Numerical Simulation of Water–Silt Inrush Hazard of Fault Rock: A Three-Phase Flow Model

Cited by 94 publications

References 37 publications

A state-of-the-art review on rock seepage mechanism of water inrush disaster in coal mines

A state-of-the-art review on rock seepage mechanism of water inrush disaster in coal mines

Research on the Safety Thickness of Tunnel Outburst Prevention in Water-Rich Fault Fracture Zone Based on Janssen’s Theory

Numerical Simulation Investigation on Fracture Propagation of Fracturing for Crossing Coal Seam Roof

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