Geotechnical and rheological characteristics of waste rock deposits influencing potential debris flow occurrence at the abandoned Imgi Mine, Korea

Jeong, Sueng Won

doi:10.1007/s12665-014-3991-1

Cited by 14 publications

(4 citation statements)

References 36 publications

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“…These results suggest that more research is needed to understand the mechanism related to the high mobilization of debris flows, e.g., entrainment, hydroplaning, yield stress reduction, and wetting processes in debris flow motion. It is necessary to revisit the research work ( [24] see Figure 8 in the paper) on failure and post-failure characteristics of mine deposit areas and to estimate the debris flow mobility for such areas. Using the same geometry for the initial slope and volume with different yield stresses, the debris flow propagation can be simply compared.…”

Section: Rheological Properties and Possible Implications For Debris mentioning

confidence: 99%

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Shear Rate-Dependent Rheological Properties of Mine Tailings: Determination of Dynamic and Static Yield Stresses

Jeong¹

2019

Applied Sciences

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In this paper, shear rate-dependent rheological properties of mine tailings taken from abandoned mine deposits prone to mass movements are examined using a commercial ball-measuring rheological system. The yield stresses (i.e., dynamic and static yield stresses) and viscosity of sand-rich materials are examined by the shear rate-controlled flow curve and time-dependent stress growth methods. Before yielding, the shear stress reaches a peak value (i.e., yield stress) observed for all flow curves. In the steady-state condition, the materials have a minimum shear stress (i.e., dynamic yield stress). The static yield stress can be determined under a constant applied shear rate with different initial values ranging from 10−4 to 10−1 s−1. As a result, the Bingham yield stress and viscosity can be used as a first approximation for estimating the debris flow mobility of post-failure materials. However, the Bingham yield stress is competitive with the static yield stress measured from stress growth methods. Upon comparison of the dynamic and static yield stresses, the static yield stress is approximately 35–45 times greater than the dynamic yield stress, and may be strongly related to microstructural changes (i.e., thixotropy). In this context, special attention must be paid to the determination of yield stresses in debris flow mitigation programs.

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Section: Rheological Properties and Possible Implications For Debris mentioning

confidence: 99%

“…The grain sizes were fine to coarse, and the shapes were subangular. The main mineralogical composition was quartz, pyrophyllite, pyrite, sericite, and kaolin clay [22,24]. The on-site materials are very coarse: 30% gravel, 60-70% sand, and 5% finer sizes (clay and silt particles).…”

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confidence: 99%

Shear Rate-Dependent Rheological Properties of Mine Tailings: Determination of Dynamic and Static Yield Stresses

Jeong¹

2019

Applied Sciences

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“…The waste materials were sourced from Busan Metropolitan city, Korea. They are taken from Imgi mine deposits, where the landslide occurs due to intense rainfall [ 21 , 22 , 23 ]. The landslide materials are mainly contained sub-graded and angular grains composed of pyrite, kaolinite, sericite, pyrophyllite, and quartz.…”

Section: Methodsmentioning

confidence: 99%

Numerical Analysis of Shear and Particle Crushing Characteristics in Ring Shear System Using the PFC2D

et al. 2021

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The shear and particle crushing characteristics of the failure plane (or shear surface) in catastrophic mass movements are examined with a ring shear apparatus, which is generally employed owing to its suitability for large deformations. Based on results of previous experiments on waste materials from abandoned mine deposits, we employed a simple numerical model based on ring shear testing using the particle flow code (PFC2D). We examined drainage, normal stress, and shear velocity dependent shear characteristics of landslide materials. For shear velocities of 0.1 and 100 mm/s and normal stress (NS) of 25 kPa, the numerical results are in good agreement with those obtained from experimental results. The difference between the experimental and numerical results of the residual shear stress was approximately 0.4 kPa for NS equal to 25 kPa and 0.9 kPa for NS equal to 100 kPa for both drained and undrained condition. In addition, we examined particle crushing effect during shearing using the frictional work concept in PFC. We calculated the work done by friction at both peak and residual shear stresses, and then used the results as crushing criteria in the numerical analysis. The frictional work at peak and the residual shear stresses was ranged from 303 kPa·s to 2579 kPa·s for given drainage and normal stress conditions. These results showed that clump particles were partially crushed at peak shear stress, and further particle crushing with respect to the production of finer in shearing was recorded at residual shear stress at the shearing plane.

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“…Currently, research on the mine debris flow mechanism focuses on the slope of open-pit mine dumps. However, the mechanism of underground debris flows has received little research attention 8 – 12 , where the existing literature contains only a brief introduction to underground debris flows, a simple occurrence mechanism, and prevention measures. Wang et al 13 , 14 studied the debris flow in Jinshandian iron mine using physical similarity tests.…”

Section: Introductionmentioning

confidence: 99%

Study on formation mechanism of mud-inclusion-type underground debris flows using natural caving method

Niu,

Hou,

Bao

et al. 2024

Sci Rep

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This study aimed to investigate the formation mechanism of the mud-inclusion-type underground debris flows of natural caving underground mines. The characteristics of fine moraine particles flowing through the coarse-grained ore bed were used to analyze the formation process of mud inclusions in the caving ore bed through a physical model test. Based on the movement behavior of the mud inclusions of moraine in the caving ore bed, a formation-mechanism generalized model of underground debris flows with mud inclusions was established. The model was used to examine the formation mechanism of mud-inclusion-type underground debris flows in natural caving. The results showed that the fine moraine particles had good cross-flow characteristics in the process of drawing coarse-grained ore. The accumulation of fine moraine in the ore bed was a prerequisite for the formation of mud inclusions, and the fluid inclusions were formed by a mixture of the particles with the infiltrated water. When mud inclusions in moraine are affected by many factors, such as ore-drawing vibrations, blasting vibrations, and groundwater, the inclusions undergo multiple migration–stop–migration cycles, resulting in separation or fusion. However, the inclusions are released along the optimal random pore path to the outlet, forming a certain scale of underground debris flows accidents. The accuracy and reliability of the formation mechanism were verified through geophysical explorations based on the equivalent inverse flux transient electromagnetic method. This study not only broadens the research on debris flow, but also provides theoretical guidance for the prevention and control of underground debris flows.

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Geotechnical and rheological characteristics of waste rock deposits influencing potential debris flow occurrence at the abandoned Imgi Mine, Korea

Cited by 14 publications

References 36 publications

Shear Rate-Dependent Rheological Properties of Mine Tailings: Determination of Dynamic and Static Yield Stresses

Shear Rate-Dependent Rheological Properties of Mine Tailings: Determination of Dynamic and Static Yield Stresses

Numerical Analysis of Shear and Particle Crushing Characteristics in Ring Shear System Using the PFC2D

Study on formation mechanism of mud-inclusion-type underground debris flows using natural caving method

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