Investigation of critical non-linear flow behavior for fractures with different degrees of fractal roughness

Guan, Rong; Cheng, Long; He, Ruhan; Quan, Junsong; Tan, Jie

doi:10.1016/j.compgeo.2021.104065

Cited by 15 publications

(2 citation statements)

References 47 publications

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“…Chen et al [19] adopted 3D rough rock fracture model to conduct seepage tests under different confining pressures, which showed the streamline becomes more tortuous and the critical Reynolds number increases under high stress. The relationship between the flow rate and fracture surface roughness under different normal stresses is also studied [20,21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Grouting and Flow Characteristics of Rough Vertical Fractures

Liu

Shi

et al. 2022

Geofluids

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It is of great engineering significance to study the seepage characteristics and flow field distribution of rough fractured rock masses for grouting to stop leakage. Through the visual fracture seepage test device we developed, the visual seepage characteristics of tension fractures under vertical angles and different stress paths of grout and water were studied. Through silica gel secondary mould turning technology, the fracture morphology is accurately reprinted; based on GIS simulation technology, the visualization of the fracture surface spatial data is realized; the actual seepage area and flow path of the fluid are measured accurately by using digital image self-recognition technology, and the variation law of the grout and water seepage area under the coupling of normal stress and water pressure is obtained. Through visualization, it is pointed out that, with the increase of normal stress, the fracture water can be divided into three stages, archipelago flow, transition flow, and groove flow, while the grout has no capillary permeability and no archipelago flow effect because of its high viscosity. The critical point of grout antiseepage is defined and calibrated by data. Based on the analysis of the cross-sectional velocity of the groove flow, it is pointed out that the relationship between the velocity on the flow path and JRC is an exponential function. The main flow path is mainly distributed in the area where the JRC is relatively small. As the normal stress increases, the first deflection point of the grout flow path appears in the maximum region of JRC (6.42); the secondary deflection point appears in the second largest region of the flow path JRC (4.53), and the fluid of deflection point has the maximum kinetic energy on the main flow path. The current study can accurately obtain the relevant parameters of vertical fracture grouting seepage characteristics and provide theoretical guidance for solving the key scientific problems in grouting engineering, such as invisible flow paths and unmeasurable velocity vectors.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Grouting and Flow Characteristics of Rough Vertical Fractures

Liu

Shi

et al. 2022

Geofluids

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“…To determine the hydraulic disaster mechanism of red-bed soft rock from the perspective of material science, this study focused on the basic scientific problems of damage and seepage characteristics of red-bed mudstone under hydrodynamic conditions and conducted an X-ray visualization test on the fissure flow during red-bed mudstone fracture [14]. Some study results about mechanics, damage and hydro properties of rocks have been revealed by experiments of acoustic emission signals [15,16], flow rate [17], fissure flow behaviors [18][19][20] and so on. In this study, the X-ray image features were analyzed through threshold segmentation and an LOG image algorithm, and the physical phenomena of the nonlinear seepage behavior and diffusion during the fracture of red mudstone specimens were explored.…”

Section: Introductionmentioning

confidence: 99%

Hydro-Damage Properties of Red-Bed Mudstone Failures Induced by Nonlinear Seepage and Diffusion Effect

Liu

Dong

et al. 2022

Water

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Nonlinear catastrophes caused by geological fluids are a fundamental issue in rock mechanics and the geoengineering hazard field. For the consideration of hydrodynamic force on red-bed mudstone softening damage, X-ray visualization tests on the fissure flow in mudstone block failure under hydrodynamic force was performed in this study based on block scale, and the physical phenomena of fissure seepage and nonlinear diffusion were further explored. A new method for evaluating the hydro-damage degrees of rocks using an X-ray image analysis was proposed, and the quantitative relation of diffusion coefficients of hydro-damage and seepage was established. The research results revealed that the hydrodynamic force promoted the fluid-filled fissure behavior in mudstone specimen failure. Furthermore, the seepage and diffusion phenomena of fluid in rocks during failures were indicated using X-ray imaging. A dual mechanical behavior was presented in the nonlinear seepage and abnormal diffusion of a red mudstone geological body under hydrodynamic conditions. The damaged degree of mudstone was aggravated by the effect of hydrodynamic force, and the initial seepage–diffusion coefficient with respect to lower hydro-damage was larger than the final seepage–diffusion coefficient with respect to higher hydro-damage of rocks with a decreasing nonlinear trend.

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Nonlinear Flow Model for Rock Fracture Intersections: The Roles of the Intersecting Angle, Aperture and Fracture Roughness

et al. 2022

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Investigation of critical non-linear flow behavior for fractures with different degrees of fractal roughness

Cited by 15 publications

References 47 publications

Experimental Study on Grouting and Flow Characteristics of Rough Vertical Fractures

Experimental Study on Grouting and Flow Characteristics of Rough Vertical Fractures

Hydro-Damage Properties of Red-Bed Mudstone Failures Induced by Nonlinear Seepage and Diffusion Effect

Nonlinear Flow Model for Rock Fracture Intersections: The Roles of the Intersecting Angle, Aperture and Fracture Roughness

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