A DEM-based approach for modeling the evolution process of seepage-induced erosion in clayey sand

Gu, Dong Ming; Huang, Da; Liu, Han long; Zhang, Wengang; Gao, Xue

doi:10.1007/s11440-019-00848-0

Cited by 40 publications

(12 citation statements)

References 46 publications

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“…Qiao et al [35] found that the porosity of sandstone increased compared with static water conditions. The predictive models for simulating time-dependent strength degradation behavior of carbonate rocks and clayey sands under the influence of water has been establish by using numerical modeling [16,17]. Following [15], Geist established the sandstone stress-strain constitutive relation and damage evolution for elastoplastic damage problems.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the influence of hydro-chemical erosion on morphology parameters and shear properties of limestone fractures

et al. 2021

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Hydro-chemical erosion has a great effect on the micro-structure morphology and macroscopic mechanical properties of the rock mass. In this paper, direct shear test system was used to study the hydro-chemical effect on the shear strength characteristics of limestone fractures. Besides, morphology parameters of the fracture under different chemical solutions were also analyzed through three-dimensional laser scanning and electron microscope imaging. Experimental results showed that after hydro-chemical erosion, the profile mean square root deviation S q , the profile area ratio R s , the profile peak point density S pd increased, while the slope mean square root S dq decreased. Combined with scanning electron microscope (SEM) images, it is found that due to the hydro-chemical erosion, the roughness of limestone fracture surface, the discreteness of height distribution of the asperities and the JRC 2D values increased, but the slope of asperities decreased. There was a good exponential relation between the decrease percentage of limestone internal friction angle and soaking time, and a logarithmic relation between the decrease percentage of cohesion and soaking time. According to the gray correlation method, the influencing factors were ranked in descending order as follows: normal stress, soaking time and pH values. In addition, the JRC 2D value had a negative linear correlation with internal friction angle and cohesion of limestone fracture.

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Section: Introductionmentioning

confidence: 99%

Experimental study on the influence of hydro-chemical erosion on morphology parameters and shear properties of limestone fractures

et al. 2021

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“…e mudstone stratum is generally located at the top and/or bottom of these reservoirs. Hence, in such underground engineering projects, high temperature and high heating rate may lead to thermal damage of the reservoir rocks [1][2][3][4][5][6][7][8]. In addition, the mudstone stratum is subjected to high temperatures and triaxial ground stresses.…”

Section: Introductionmentioning

confidence: 99%

Thermal Expansion of Triaxially Stressed Mudstone at Elevated Temperatures up to 400°C

Feng

Qiao

Dong

et al. 2020

Advances in Materials Science and Engineering

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In order to study the thermal deformation of the rock that surrounds underground engineering projects with elevated temperatures (e.g., underground coal gasification, coal in situ pyrolysis, in situ oil and gas extraction from oil shale, geothermal energy extraction from rock, among others), a servocontrolled machine (model IMT-HTP 100F) was used to examine the thermal expansion of triaxially stressed mudstone at temperature up to 400°C. Two distinct stages of thermal expansion were found at temperatures up to 400°C: very small thermal expansion below 50°C, followed by almost constant thermal expansion at 50–400°C. This linear thermal expansion coefficient of triaxially stressed mudstone did not increase in the range 50–400°C. The effect of the applied triaxial stress was on both close cracks and impeded grain expansion and the swelling of the rock. Mudstone had a larger linear thermal expansion coefficient than either sandstone or limestone, in that order. The potential energy theory was used to explain the intrinsic variation of thermal expansion of the different rock types.

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“…Despite the complication of solid particles and pore networks, previous studies have confirmed that porous soil statistically presents fractal characteristics [8][9][10][11]. Fractal, first introduced in detail by Mandelbrot and widely used in various aspects of natural science, offers a unique opportunity towards a rational basis for the complexity of soil properties [12].…”

Section: Introductionmentioning

confidence: 99%

Fractal Characteristics of the Seepage Erosion Process in Porous Soil

Wang

Duan

et al. 2022

Geofluids

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Seepage-induced erosion in porous soil has always been a major concern in the field of geofluids. Various fractal models have been built to theoretically investigate the porosity and permeability coefficient. However, the seepage erosion process (i.e., incubation, formation, evolution, and destruction) in porous soil is not clearly demonstrated to clarify the seepage fractal characteristics. In this paper, a series of hydraulic tests were performed to reveal the mass fractal characteristics of sandy gravels, coarse-grained sands, and fine-grained sands in the seepage erosion process. The results show that the mass fractal dimension was appropriate to describe the cumulative mass distribution of particles, the complexity of pore networks, and the dynamic changes of the seepage erosion process. Moreover, the scale-invariant interval, as an essential precondition for the accurate calculation of the mass fractal dimension, was to some extent affected by the average grain size and the fine content of porous soil. In particular, the changing trend of porosity and permeability coefficient with the mass fractal dimension was demonstrated in the seepage erosion process. Both porosity and permeability coefficients indicated an increasing trend as the development of seepage erosion. However, the mass fractal dimension gradually decreased due to the removal of fine particles induced by seepage flow water. Research findings will not only provide a new perspective on the seepage erosion mechanism but also predict the development of the seepage erosion process in engineering practice.

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A DEM-based approach for modeling the evolution process of seepage-induced erosion in clayey sand

Cited by 40 publications

References 46 publications

Experimental study on the influence of hydro-chemical erosion on morphology parameters and shear properties of limestone fractures

Experimental study on the influence of hydro-chemical erosion on morphology parameters and shear properties of limestone fractures

Thermal Expansion of Triaxially Stressed Mudstone at Elevated Temperatures up to 400°C

Fractal Characteristics of the Seepage Erosion Process in Porous Soil

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