Determination of rock mass weakening coefficient after blasting in various fracture zones

Isheyskiy, V.A.; Marinin, M. A.

doi:10.5267/j.esm.2017.4.001

Cited by 14 publications

(9 citation statements)

References 5 publications

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“…The specimens are uniaxially loaded in a MTS815 Flex Test GT rock mechanics testing system. 25 The data are collected with a program called MTS FlexTest 60, which electronically records the time, load, and displacement. Axial load is imposed on the surface of specimens at a constant loading rate of 0.05 mm/minute until the specimen fails.…”

Section: Loading Procedures and Combined Aom Monitoringmentioning

confidence: 99%

See 1 more Smart Citation

Progressive failure of brittle rocks with non‐isometric flaws: Insights from acousto‐optic‐mechanical (AOM) data

Zhang

Zhou

et al. 2019

Fatigue Fract Eng Mat Struct

124

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Uniaxial compression tests combined with nondestructive testing techniques are performed to explore the roles of non‐isometric flaws in crack developments in brittle rocks. The acoustic emission (AE) rate‐process theory is adopted to analyze fracture‐related AE event rate characteristics. The full‐field optical method is applied to detect cracking modes. Experimental results show that AE activity is quite active when the matrix microcracking is dominant, while after each macrocracking event, AE activity becomes inactive because of the stress release. Multiphysical data for each tested flaw configuration faithfully confirm the rupture progressivity. The larger the flaw length ratio, the lower the peak stress (also peak axial strain and elastic modulus), as well as the more progressive the cracking process. Moreover, ultimate failure is triggered by the shear fracturing from the relatively long flaw. The short flaw is conditionally involved in ultimate failure when the stress buildup effect dominates. Finally, the fracture mechanism of brittle rocks with non‐isometric flaws is revealed.

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Section: Loading Procedures and Combined Aom Monitoringmentioning

confidence: 99%

“…The specimens are uniaxially loaded in a MTS815 Flex Test GT rock mechanics testing system . The data are collected with a program called MTS FlexTest 60, which electronically records the time, load, and displacement.…”

Section: Experimental Procedures and Data Processingmentioning

confidence: 99%

Progressive failure of brittle rocks with non‐isometric flaws: Insights from acousto‐optic‐mechanical (AOM) data

Zhang

Zhou

et al. 2019

Fatigue Fract Eng Mat Struct

124

View full text Add to dashboard Cite

show abstract

“…In order to examine a decrease in strength characteristics of the rock piece in various fracture zones, a set of experiments was carried out on physical models made of rock-like material (physical and geometrical similarity of the models was adhered to). Under laboratory conditions, model blocks were developed that met all similarity criteria for modeling of the natural environmentgranites from the field «Gavrilovskoye-1» (ZAO «Gavrolovskoye Open-Mine Group») [2].…”

Section: Introduction and Methodsmentioning

confidence: 99%

“…

Current work is a part of research dedicated to the influence of energy characteristics of the explosives on strength properties of the blasted rock mass [1,7]. The paper describes results of a modeled experiment on how the energy of the blast affects strength properties of the broken rock in the shotpile taking into account fracture zones.

…”

mentioning

confidence: 99%

Strength Properties Change Analysis of Exploded Rock Pieces

Isheysky

Marinin

Fomin

2018

KEM

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“…For example, Lundberg [14] performed some compression tests on rock-like materials using the SHPB technique. Isheyskiy and Marinin [15] investigated the strength of blasted rocks accounting for fracture zones and explored the relationship between uniaxial compressive strength of average rock and energy consumption. Gary and Bailly [16] applied some improved loading technique to determine the triaxial compressive strength of rock-like materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Fracture Characterizations of Rocks under Dynamic Tension Test with Image Processing

Zhao

Xie

et al. 2019

Shock and Vibration

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To investigate the fracture characterizations of rocks under high strain rate tensile failure, a series of dynamic Brazilian tests was conducted using Split Hopkinson pressure bar (SHPB), and a high-speed digital camera at a frame rate of 50,000 frames per second (FPS) with a resolution of 272 × 512 pixels was adopted to capture the real-time images and visualize the failure processes. Using the extracted cracks and image processing technique, the relationship between loading condition (impact velocity), crack propagation process (crack velocity, crack fractal characteristic, and crack morphological features), and dynamic mechanical properties (absorbed energy and strain-stress parameters) was explored and analyzed. The experimental results indicate that (1) impact velocity plays a critical role in both crack propagation process and dynamic mechanical properties, (2) the crack fractal dimension is positively correlated with crack propagation velocity and has a linear relationship with the proposed morphological feature of crack, (3) mean strain rate and max strain of rocks under SHPB loading both decrease with the increase of crack propagation velocity, and (4) the energy absorbed by the rocks increases with increasing impact velocity and has a strong negative correlation with a proposed novel crack descriptor. Experimental studies pertaining to the measurement of crack propagation path and velocity, in particular, some crack feature extraction approaches, present a promising way to reveal the fracture process and failure mechanisms of rock-like materials.

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Determination of rock mass weakening coefficient after blasting in various fracture zones

Cited by 14 publications

References 5 publications

Progressive failure of brittle rocks with non‐isometric flaws: Insights from acousto‐optic‐mechanical (AOM) data

Progressive failure of brittle rocks with non‐isometric flaws: Insights from acousto‐optic‐mechanical (AOM) data

Strength Properties Change Analysis of Exploded Rock Pieces

Experimental Study of Fracture Characterizations of Rocks under Dynamic Tension Test with Image Processing

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