Experimental Investigation of Water–Sand Mixed Fluid Initiation and Migration in Porous Skeleton during Water and Sand Inrush

Yang, Xiulun; Liu, Yong J.; Xue, Ming; Yang, Tao; Yang, Bin

doi:10.1155/2020/8679861

Cited by 16 publications

(8 citation statements)

References 39 publications

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“…For the research on the motion properties of two-phase flow, the results show that the threshold velocity of the motion of the particles is affected by their sizes (Yang et al 2020;Zhang et al 2021a). Considering the aggregation effect of particles under the interparticle adhesion, Wang et al (2019b) simplified the fractured sand-stone samples.…”

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

103

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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

103

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“…Ma et al [40] indicated that this behaviour may be related with the rearrangement of the skeleton. By conducting numerous experimental studies, Yang et al [44] concluded that, at the beginning of the test, water is the dominant phase. As the water flow velocity However, this may be related to the rheological properties of the mixed fluid, because extremely small changes in the concentration of aeolian sand can lead to large variations in velocity [45].…”

Section: Water-sand Two-phase Migration Characteristicsmentioning

confidence: 99%

Experimental Investigation of Water‐Sand Mixed Fluid Initiation and Migration in Filling Fracture Network during Water Inrush

Yang

2021

Advances in Civil Engineering

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For water inrush induced by fracture network flow, the critical velocity of the incipient motion of sand particles was obtained, and the functional relation between critical velocity and particle size was established through a series of tests on the nonlinear flow characteristics of a filling fracture network. The influence of the particle size distribution, hydrodynamic force, and geometric features of the fracture network on the characteristics of particle loss; distribution laws; and water-sand, two-phase migration was also explored. Moreover, the interactions amongst water, movable particles, the surface of the skeleton, and fracture walls, and the formation mechanism of the flow channel were qualitatively analyzed. In addition, the change rules of the mass loss characteristics and porosity of the samples with time were tested successfully. The calculation methods of the permeability and non-Darcy factor of the filling fracture network were also determined.

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“…Abundant coal resources (36% of coal resources) are found in the western region of China; however, it is prone to have water and sand inrush disasters in the mining process due to the fragile ecological environment in the western region [1][2][3]. As presented in Figure 1 [4], the broken rock mass (porous skeleton) in the caving zone connects the aquifer and the goaf zone during the mining process, constituting an effective channel for the transport of water-sand mixed fluids [5,6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Sand Inrush Hazard of Water-Sand Two-Phase Flow in Broken Rock Mass

Chen

et al. 2021

Geofluids

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In the western region of China, coal mining activities are prone to induce water and sand inrush disasters, which seriously threaten the safe production of the coal resources. In this paper, an experimental device was designed to simulate the process of water and sand inrush, and then, the control factors of the disasters in the broken rock mass in the goaf were investigated. Also, the seepage fracture channels in the broken rock mass were simplified by using the 3D printing technology, and the effects of fracture aperture and angle on the seepage characteristics of water-sand mixtures were analyzed. The experimental results showed that the porosity and skeleton structure of the broken rock mass were the key factors to control the water and sand inrush disasters. The smaller the initial porosity of the broken rock mass, the weaker its permeability, and the less probable to form a dominant channel for the water and sand inrush disasters. Conversely, the broken rock mass structure with larger size gradation was more likely to form the permeable channels, and the quality of the sand inrush was greater. In addition, it was also found that the angle of the fractures within the broken rock mass affected the seepage characteristics of water-sand mixture, and the permeability showed an exponential relationship with the fracture angle. Meanwhile, as the fracture aperture increased, the fracture angle generated greater influence on the permeability. Finally, we proposed the water and sand inrush prevention and control technology based on the experiment results. The results of this study can provide a reference for the control of water and sand inrush disasters in western China.

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Experimental Investigation of Water–Sand Mixed Fluid Initiation and Migration in Porous Skeleton during Water and Sand Inrush

Cited by 16 publications

References 39 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

Experimental Investigation of Water‐Sand Mixed Fluid Initiation and Migration in Filling Fracture Network during Water Inrush

Experimental Study on Sand Inrush Hazard of Water-Sand Two-Phase Flow in Broken Rock Mass

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