Crack Evolution in Damage Stress Thresholds in Different Minerals of Granite Rock

Ghasemi, Shahram; Khamehchiyan, Mashalah; Taheri, Abbas; Nikudel, Mohammad Reza; Zalooli, Ahmad

doi:10.1007/s00603-019-01964-9

Cited by 79 publications

(36 citation statements)

References 58 publications

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“…Fine-grained Va-G had a higher number of intercrystalline microcracks before and after the aging test than coarse-grained Sh-M. Crystal size mainly influences the ratio of inter-to intra-crystalline microcracks in granites (Sousa 2013;Ghasemi et al 2020).…”

Section: Discussionmentioning

confidence: 97%

Artificial microcracking of granites subjected to salt crystallization aging test

Zalooli

Khamehchiyan

Nikudel

et al. 2020

Bull Eng Geol Environ

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Salt crystallization-induced decay of Vardavard granodiorite and Shirkouh monzogranite, two Iranian building stones, were assessed with two non-destructive methods: saturation-buoyancy technique and P-and S-wave velocity measurement. Moreover, polarized and fluorescence microscopy studies were used to evaluate the behavior of the studied stones at microscopic scale against a salt crystallization aging test. The aging test extended pre-existing microcracks and generated new ones. Intracrystalline microcracking was the most predominant microcrack type for both samples. Fine-grained Vardavard granodiorite experienced higher intercrystalline microcracking than coarse-grained Shirkouh monzogranite. The microcracking mechanism of feldspars substantially depends on their alteration degree and microstructural precursors. When a growing microcrack reaches a biotite, it propagates within the crystal if the growing microcrack coincides with the cleavage plane; otherwise, it propagates as an intercrystalline one. The increase in maximum microcrack length of the samples was higher than the increase in their mean microcrack length. Low-strength Vardavard granodiorite showed higher microcrack width after the aging test. Dry weight loss in low-strength Vardavard granodiorite was more pronounced than in high-strength Shirkouh monzogranite. Dry unit weight decreased at a higher rate than saturated unit weight with the increase of effective porosity. The reduction in ultrasonic wave velocities and the increment in effective porosity and water absorption were more pronounced for Vardavard granodiorite, indicating a higher degree of decay, i.e., higher microcrack generation, enlargement, and widening. Shirkouh monzogranite, which has large-sized crystals and pores, wider initial microcracks, high tensile strength, and low effective porosity and microcrack density, was more durable than Vardavard granodiorite.

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Section: Discussionmentioning

confidence: 97%

Artificial microcracking of granites subjected to salt crystallization aging test

Zalooli

Khamehchiyan

Nikudel

et al. 2020

Bull Eng Geol Environ

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“…There are many natural cracks in the coal-rock composite structure (as shown in Fig. 1), which has an important impact on the stability of the composite structure (Ghasemi et al, 2019;Zhu and Yu, 2020;Sharafisafa et al, 2020). The occurrence of cracks in the rock mass is random, and the mechanical properties of cracks in different parts of the same rock mass are different (Shirole et al, 2020;Liu et al, 2020;Du et al, 2020;Zhou et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

The effect of crack characteristics on the mechanical properties and energy characteristics of coal-rock composite structure

Li¹

2022

Acta Geodynamica Et Geomaterialia

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With the gradual increase of coal mining intensity, many coal pillars need to be left near the stope. The stability of the composite structure of coal pillars and their overlying strata determines the safety of the whole stope and the surface. This paper conducts uniaxial compression tests on coalrock composite structures with the same lithology and the same coal-rock height ratio and finds the coal-rock composite structure's mechanical properties and failure characteristics have greater discreteness. Combining the CT images of rock and coal, it is concluded that the main reason for the discreteness of the composite structure test results is the different crack characteristics in the rock specimen and the coal specimen. Therefore, this paper uses the PFC numerical simulation software to analyzes the influence of the crack characteristics on the mechanical properties, failure characteristics, and impact energy index of the coal-rock composite structure. The sensitivity factors are used to analyze the influence of crack angle, crack length, crack number and crack position on the peak stress, total crack number, and impact energy index of the coal-rock composite structure. The research results can provide a theoretical basis and guidance for preventing the instability and failure of the coal pillar-roof composite structure.

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“…At present, many scholars have done a lot of research on the mechanical properties of rock with cracks (Taheri et al 2020;Spetz et al 2020;Aliabadian et al 2019;Ghasemi et al 2019;Xiao et al 2020;Yan et al 2020;Li et al 2000). Zhang et al (2021) studied the influence of joint arrangement (different rock bridge angles) on the strength and cracked propagation of red sandstone by uniaxial compression test and observed the fracture process by acoustic emission and strain monitoring methods.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation study on the influence of crack characteristics on mechanical properties and impact failure of rock

Chen

Qin

et al. 2021

Arab J Geosci

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The rock mass in nature have different degrees of crack development. The different crack characteristics affect the mechanical properties and stability of the rock mass. This paper uses PFC simulation software to perform uniaxial compression tests on rock specimens with different crack characteristics and analyzes the influence of the crack characteristics on the mechanical property, impact energy index, and failure characteristics. The sensitivity analysis is used to analyze the influence degree of crack characteristics. It is concluded that the peak strength is directly proportional to the crack angle and inversely proportional to the crack length, the crack number, and the crack width. The peak strain is directly proportional to the crack angle, the crack number, and the crack width and is inversely proportional to the crack length. The impact energy index of rock specimen increases gradually with the crack angle, crack number, and crack width. The influence degree of crack characteristics is divided into four grades by sensitivity analysis. The crack angle has a more significant influence on the peak stress, peak strain, and impact energy index, and the crack width has a more minor influence on the peak stress and peak strain. The research results can provide the theoretical basis and guidance for preventing the instability and failure of the rock mass with different crack characteristics. KeywordCrack characteristic • Mechanical property • Progressive instability • Impact energy index • Sensitivity analysis * Tan Li

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Crack Evolution in Damage Stress Thresholds in Different Minerals of Granite Rock

Cited by 79 publications

References 58 publications

Artificial microcracking of granites subjected to salt crystallization aging test

Artificial microcracking of granites subjected to salt crystallization aging test

The effect of crack characteristics on the mechanical properties and energy characteristics of coal-rock composite structure

Numerical simulation study on the influence of crack characteristics on mechanical properties and impact failure of rock

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