Thermal cracking characteristics of high-temperature granite suffering from different cooling shocks

Shen, Yanjun; Hou, Xin; Yuan, Jiangqiang; Wang, Shao-Fei; Chunhu, Zhao

doi:10.1007/s10704-020-00470-2

Cited by 30 publications

(6 citation statements)

References 53 publications

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“…гінтова та ін ших (Шульц, 1979) (ломизе, 1951) . тому розкритість трі щин, їхній розмір, розподіл, орієнтація тощо пов'язані з характером напруженого стану та типом порід (крихкі, пластичні), структурни ми особливостями, глибиною залягання (на приклад, Shen et al ., 2020) .…”

Section: оCновна частина тріщинуватість та проникність кристалічних п...unclassified

Fracturing and Permeability of Crystal Rocks and Their Fracture Zones, Hydrogeological Aspect

Shestopalov¹,

Petrenko²

2022

Geol. ž.

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Fractured rock aquifers are regarded as of particular scientific and practical interest because of their importance for underground water supply, energy storage and safety radioactive waste disposal. The study of fissure waters of crystalline rocks in the context of global warming to address issues of drinking water supply is highly relevant today. It has potential practical importance for the future.The sustainable use of groundwater in fractured rock aquifers requires a detailed knowledge of their hydraulic properties. The complexity of hydrogeological conditions in massive fractured rocks results from uncertainties about the configuration of the fractures, while the potential for groundwater movement in such rocks is primarily determined by their permeability and, consequently, hydraulic conductivity. Fractures (fracture networks) have different permeability properties, which is one of the key parameters required for understanding and predicting fluid and water flow. This paper reviews and analyses the results of global studies of fracturing and permeability of crystalline rock massifs and the fault zones occurring in them. Since the study of permeability of crystalline rocks concerns many disciplines — including structural geology, tectonophysics, petrophysics, hydrogeology, and hydrology — this review highlights information about the distribution of groundwater in fractured crystalline rocks in the context of their potential exploitation. This study consists of two parts: generalization of research results concerning fracturing and permeability of crystalline rocks, and particularities of structure of fracture zones in crystalline rocks and of the presence of groundwater in them. Based on this review of the structure and development of fracture zones (including their evolution under the influence of weathering and other secondary processes), recommendations are given for using tectonophysical reconstructions to improve hydrogeological field works and mathematical modeling.

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Section: оCновна частина тріщинуватість та проникність кристалічних п...unclassified

Fracturing and Permeability of Crystal Rocks and Their Fracture Zones, Hydrogeological Aspect

Shestopalov¹,

Petrenko²

2022

Geol. ž.

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“…(1) Taking the 10 °C temperature drop case as an example, 9 room temperature samples were first put into the muffle furnace and heated to the target temperature of 300 °C at a rate of 5 °C/min [11][12][13][14][15][16]. In order to ensure even heating of the whole sample, the target temperature was maintained for 8 h. en the heated granite was quickly put into static water at room temperature (25 °C) until the sample was cooled to room temperature (25 °C) as well, it is the first cycle.…”

Section: Test Scheme Designmentioning

confidence: 99%

Experimental Study on Mechanical Damage and Fracture Characteristics of Granite under Different Water Cooling Conditions

Yao

Zhang

et al. 2021

Shock and Vibration

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In order to investigate the mechanical property deterioration and fracture characteristics of granite under different temperature drop and thermal cycle conditions, the evolution laws of mechanical properties, acoustic emission event distribution, and macro and micro failure characteristics of granite under different temperature changes were studied and analyzed by the servo loading, acoustic emission monitoring, and scanning electron microscope systems. The following conclusions were gained from the test results. (1) The peak stress and elasticity modulus of the three temperature drop treatments all decreased with the increase of the number of thermal cycles. In terms of magnitude, the following relationship was satisfied: 10°C > 15°C > 20°C. After 8 cycles, the peak stress and elasticity modulus tended to be stable for 15°C and 20°C temperature drops. (2) At a temperature drop of 20°C, the heterogeneity first increased and then tended to be stable; when the temperature was dropped by 15°C at each cycle, however, the heterogeneity first decreased and then became stable; as for the case of 10°C, the heterogeneity showed an overall decreasing trend. After 4 cycles, the heterogeneities were ranked as 15°C > 20°C > 10°C. After 8 cycles, 20°C > 15°C > 10°C. (3) With the decrease of temperature drop amplitude or the increase of cycles, the connectivity of microcracks in granite improved on the whole, the aperture and shape factor of microcracks increased, the damage of granite intensified, and the duration of the quiet period in the acoustic emission ringing count rate prolonged. (4) The tensile failure dominated at a temperature drop amplitude of 10°C. When the temperature drop was 15°C, the failure mode transitioned from hybrid tension-shear failure to tensile failure as the cycle times increased, whereas the hybrid tension-shear failure dominated with a temperature drop of 20°C.

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“…10,11 Therefore, the physical and mechanical properties of rock under high temperature are one of the most important research areas in the field of rock mechanics. [12][13][14] The physical and mechanical properties of rock subjected to high temperature have been studied extensively. Based on the laboratory experiments, Yin et al 15 examined the influence of cyclic heating and cooling treatments on Mode I fracture characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…The cracks generated by high temperature may induce the leakage of nuclear waste and ultimately affect the stability of the nuclear waste repository 10,11 . Therefore, the physical and mechanical properties of rock under high temperature are one of the most important research areas in the field of rock mechanics 12–14 …”

Section: Introductionmentioning

confidence: 99%

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

Xiao

Yu²,

Li³

et al. 2021

Fatigue Fract Eng Mat Struct

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To study the thermal cracking characteristics and mechanism of sandstone after high-temperature treatment, the pore size distribution and micromorphology of sandstone were observed by nuclear magnetic resonance and scanning electron microscopy. Then, based on the Weibull distribution theory, a thermal elastic mechanical model of random heterogeneous rock was established for the rock unit, the thermal stress distribution characteristics of sandstone were analyzed, and the thermal fracture mechanism of rock was discussed. The results show that the porosities of the samples increased with increasing temperature and the proportion of large pores increased significantly when exceeded 400 C. Particularly when reached 1000 C, thermal cracking was distributed in a complex network. Additionally, different rock units are in different thermal stress states, which leads to the regional differences in the distribution of rock thermal fracture. When exceeded 400 C, there were obvious thermal cracks near the outer edge that weakened the mechanical properties of rock.

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Thermal cracking characteristics of high-temperature granite suffering from different cooling shocks

Cited by 30 publications

References 53 publications

Fracturing and Permeability of Crystal Rocks and Their Fracture Zones, Hydrogeological Aspect

Fracturing and Permeability of Crystal Rocks and Their Fracture Zones, Hydrogeological Aspect

Experimental Study on Mechanical Damage and Fracture Characteristics of Granite under Different Water Cooling Conditions

Thermal cracking characteristics and mechanism of sandstone after high‐temperature treatment

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