Mechanical properties of granite under real-time high temperature and three-dimensional stress

Ma, Xinfang; Wang, Guiling; Hu, Dawei; Liu, Yanguang; Zhou, Hui; Liu, Feng

doi:10.1016/j.ijrmms.2020.104521

Cited by 63 publications

(24 citation statements)

References 27 publications

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“…e system is mainly composed of three modules: true triaxial loading module, high-temperature control module, and servo control and data acquisition module [22]. e maximum and minimum principal stresses are, respectively, up to 1000 and 200 MPa at a real-time maximum temperature of 600°C.…”

Section: Test Equipmentmentioning

confidence: 99%

Experimental Study on Thermal Expansion Behavior of Concrete under Three‐Dimensional Stress

Zhao

et al. 2021

Advances in Civil Engineering

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Concrete is widely used in underground engineering and bears three-dimensional stress transmitted by overlying load. When a fire occurs, the thermal expansion of concrete structure under such stress state is different from that under stress-free state. For this purpose, a self-developed real-time high-temperature true triaxial test system was applied to investigate the thermal expansion behavior of concrete under three-dimensional stress state. The thermal expansion strain of concrete under the three-dimensional stress undergoes strain increasing and strain stabilizing stages. At 600°C, the maximum thermal expansion strain of concrete under the three-dimensional stress is 0.75%. The average coefficient of thermal expansion of concrete under three-dimensional stress condition was then calculated, and its value reaches the minimum of 8.68 × 10−6/°C at 200°C and the maximum of 13.41 × 10−6/°C at 500°C. Comparing the coefficient of thermal expansion of concrete under stress-free condition given by Eurocode, it is found that the three-dimensional stress has an obvious restraint on the thermal expansion of concrete. The research results can provide theoretical basis for the stability analysis of underground engineering concrete structures under high-temperature environment.

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Section: Test Equipmentmentioning

confidence: 99%

Experimental Study on Thermal Expansion Behavior of Concrete under Three‐Dimensional Stress

Zhao

et al. 2021

Advances in Civil Engineering

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“…In this section, the microstructure of this type of rocks and its influence on its macroscopic properties under the corresponding temperatures which deviate from usual ground or shallow to rather deeply buried conditions are mainly investigated. Adopting conventional methods of thermal treatment, many researchers [24][25][26][27][28][29][30][31][32][33] have undertaken experimental or numerical simulation studies on rock physical and mechanical properties under high temperature.…”

Section: Influence Of High Temperature On Granite Propertiesmentioning

confidence: 99%

“…While once temperature exceeded 573 °C, due to the phase transition of quartz, intra-granular cracks began to develop [26]. (2) The transformation of mechanical parameters with temperature is due to the competition between strengthening and degradation effects, which were simultaneously induced by raising temperature [27]. The former is toughness enhancement of biotite under high temperature [28] and inter-crystalline contact compaction due to volume expansion [29].…”

Section: Figurementioning

confidence: 99%

“…(4) A series of triaxial compression tests were undertaken with granite samples extracted from Hunan Province of China under four different confining pressures, i.e., 10, 30, 60, 90 MPa, and four different temperatures, i.e., Room Temperature, 100, 200, 300 • C. The results [21] showed that within range of up to moderate temperature it would be stress but not temperature that dominantly influenced rock mechanical behavior [27,33]. Although the samples deformed more along with the levels of confining stress and temperature were raised, their stress-strain curves still showed brittle failure feature when the experimental conditions fell into the ranges of confining stress and temperature.…”

Section: Figurementioning

confidence: 99%

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Numerical Study on Damage Zones Induced by Excavation and Ventilation in a High-Temperature Tunnel at Depth

Zhu

et al. 2021

Energies

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Geothermal power is being regarded as depending on techniques derived from hydrocarbon production in worldwide current strategy. However, it has artificially been developed far less than its natural potentials due to technical restrictions. This paper introduces the Enhanced Geothermal System based on Excavation (EGS-E), which is an innovative scheme of geothermal energy extraction. Then, based on cohesion-weakening-friction-strengthening model (CWFS) and literature investigation of granite test at high temperature, the initiation, propagation of excavation damaged zones (EDZs) under unloading and the EDZs scale in EGS-E closed to hydrostatic pressure state is studied. Finally, we have a discussion about the further evolution of surrounding rock stress and EDZs during ventilation is studied by thermal-mechanical coupling. The results show that the influence of high temperature damage on the mechanical parameters of granite should be considered; Lateral pressure coefficient affects the fracture morphology and scale of tunnel surrounding rock, and EDZs area is larger when the lateral pressure coefficient is 1.0 or 1.2; Ventilation of high temperature and high in-situ stress tunnel have a significant effect on the EDZs scale; Additional tensile stress is generated in the shallow of tunnel surrounding rock, and the compressive stress concentration transfers to the deep. EDZs experiences three expansion stages of slow, rapid and deceleration with cooling time, and the thermal insulation layer prolongs the slow growth stage.

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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%

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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Mechanical properties of granite under real-time high temperature and three-dimensional stress

Cited by 63 publications

References 27 publications

Experimental Study on Thermal Expansion Behavior of Concrete under Three‐Dimensional Stress

Experimental Study on Thermal Expansion Behavior of Concrete under Three‐Dimensional Stress

Numerical Study on Damage Zones Induced by Excavation and Ventilation in a High-Temperature Tunnel at Depth

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

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