An experimental investigation on thermal damage and failure mechanical behavior of granite after exposure to different high temperature treatments

Yang, Sheng‐Qi; Ranjith, P.G.; Jing, Hong Wen; Tian, Wen Ling; Ju, Yang

doi:10.1016/j.geothermics.2016.09.008

Cited by 488 publications

(138 citation statements)

References 39 publications

Supporting

Mentioning

131

Contrasting

Unclassified

Order By: Relevance

“…Overall, the failure modes of the sandstone specimens were closely related to the confining pressure, but appeared to be independent of NaCl concentration. There are two typical categories of failure patterns: splitting under uniaxial compression, and single shear failure under triaxial compression, which is consistent with the observation of previous studies [16,19,20,25]. In distilled-water-saturated specimens, the fracture angles between the fracture and the direction of minor principal stress (i.e., σ3) under confining pressures of 0, 10, 20, 40 and 60 MPa, were 90°, 81°, 78°, 79° and 71°, respectively.…”

Section: Fracture Behaviorsupporting

confidence: 92%

“…In this experiment, both axial and circumferential deformations of specimen were measured by linear variable differential transducers (LVDTs) with a range of ±6 mm (see Figure 4b). To detect the crack initiation, propagation and coalescence of micro-cracks, AE characteristics were monitored because they are related to the energy release during loading [16]. An AE measuring system (Physical Acoustic Corporation, Princeton, NJ, USA, model micro-II) was used to study the AE events in sandstone specimens.…”

Section: Testing System Descriptionmentioning

confidence: 99%

See 1 more Smart Citation

The Effects of NaCl Concentration and Confining Pressure on Mechanical and Acoustic Behaviors of Brine-Saturated Sandstone

et al. 2018

Self Cite

View full text Add to dashboard Cite

Abstract:To better understand the mechanical behavior of rock with brine saturation, conventional triaxial experiments were carried out on sandstone for a range of confining pressures (0-60 MPa) and NaCl concentrations (0-30%). As the confining pressure and NaCl concentration increased, the triaxial compressive strength, crack damage threshold, Young's modulus, cohesion, and internal friction angle all increased. Real-time ultrasonic wave and acoustic emission (AE) techniques were used to obtain the relationship between acoustic behavior and stress level during the whole triaxial compression process. During the whole deformation process, the evolution of P-wave velocity and accumulated AE count could be divided into four phases. The microstructural characteristics of brine-saturated sandstone, before and after loading, indicated that the strength enhancement mechanism may be attributed to an increase in inter-particle friction resulting from salt crystallisation around the points of contact. The angle of friction increased by more than 86% at maximum NaCl concentration compared to that for distilled water. The NaCl deposition in the pore space resulted in nonlinear strength increases for the brine-saturated sandstone specimens with increasing salinity. The present study is expected to improve the knowledge of the strength and failure mechanisms of sedimentary rock in deep saline aquifers.

show abstract

Section: Fracture Behaviorsupporting

confidence: 92%

Section: Testing System Descriptionmentioning

confidence: 99%

The Effects of NaCl Concentration and Confining Pressure on Mechanical and Acoustic Behaviors of Brine-Saturated Sandstone

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…The researchers found that the strength of the rock increases with heat treatments from 20 °C to 200 °C and decreases with heat treatments from 200 °C to 600 °C. Yang et al [19] investigated the thermal damage and failure mechanical behaviour of granite specimens after exposure to different high temperature treatments (200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, and 800 °C) by conducting uniaxial compression experiments, X-ray micro computed tomography observation and acoustic emission monitoring. These studies primarily focused on microscopic and mesoscopic structural changes of thermally stressed rock, and they demonstrate the clear dependence of deformation, strength, crack damage, acoustic emission behaviour, and failure mechanism of granite on high temperature treatment.…”

Section: State Of the Artmentioning

confidence: 99%

Experimental investigation of mechanical properties and energy features of granite after heat treatment under different loading paths

Zhang

Kang

2017

Teh. vjesn.

View full text Add to dashboard Cite

EXPERIMENTAL INVESTIGATION OF MECHANICAL PROPERTIES AND ENERGY FEATURES OF GRANITE AFTER HEAT TREATMENT UNDER DIFFERENT LOADING PATHSJunwen Zhang, Xu Chen, Hengyi KangOriginal scientific paper Temperature and loading history are the two main factors that influence rock microstructure and physical and mechanical properties. To explore the influence of heat treatment and loading path on mechanical properties and energy features of granite, granite samples were first heat-treated at 25 °C, 300 °C, 600 °C, and 900 °C. Then, 12 groups of triaxial compression experiments were placed under three loading paths, as follows: uniaxial compression, conventional triaxial compression, and confining pressure unloading. Mechanical properties and energy features in the deformation and failure process based on these experimental results were systematically compared and analyzed. Results demonstrate that Young's modulus, uniaxial compressive strength, and triaxial compressive strength increased in the temperature range of 25 °C to 300 °C, but decreased in the temperature range of 300 °C to 900 °C. Under the same loading path, the gaps among total absorbed energy, dissipated energy, and elastic strain energy widened with increasing temperature from 25 °C to 900 °C. At the same temperature, the energy features' gap under confining pressure unloading is between uniaxial and triaxial compression. The conclusions drawn in this study provide a significant reference for the design and construction of rock engineering exposed to high temperature. Keywords: energy features; heat treatment; loading paths; triaxial compression Eksperimentalno ispitivanje mehaničkih svojstava i energetskih svojstava granita nakon toplinske obrade pri različitom načinu opterećenjaIzvorni znanstveni članak Povijest temperature i opterećenja dva su glavna čimbenika koji utječu na mikrostrukturu stijene i fizikalna i mehanička svojstva. Da bi se istražio utjecaj toplinske obrade i opterećenja na mehanička svojstva i energetske značajke granita, uzorci granita najprije su toplinski obrađeni na 25 °C, 300 °C, 600 °C i 900° C. Zatim je 12 skupina eksperimenata troosnog sabijanja podvrgnuto opterećenju na tri načina, kako slijedi: jednoosno sabijanje, konvencionalno troosno sabijanje i ograničeno tlačno rasterećenje. Sustavno se uspoređuju i analiziraju mehanička svojstva i značajke energije u procesu deformacije i oštećenja na temelju tih eksperimentalnih rezultata. Rezultati pokazuju da su Youngov modul, jednoosna tlačna čvrstoća i troosna tlačna čvrstoća porasli u temperaturnom području od 25 °C do 300 °C, ali su se smanjili u temperaturnom području od 300 °C do 900 °C. Pod istim načinima opterećenja, razlike između ukupne apsorbirane energije, raspršene energije i elastične energije naprezanja povećale su se s porastom temperature od 25 °C do 900 °C. Pri istoj temperaturi, razlika između energetskih značajki pod rasterećenjem ograničenim tlakom je između jednoosnog i troosnog sabijanja. Zaključci izneseni u ovoj studiji pružaju značajnu referencu za projektiranje...

show abstract

“…Compared with conventional fossil fuels, for instance coal and oil, geothermal energy is one of the most abundant sources of energy, which offers great advantages in cost, reliability and environmental friendliness [1][2][3][4]. This has stimulated further investigation on the mechanical behavior of rock at high pressure and temperature.…”

Section: Introductionmentioning

confidence: 99%

Multi-Step Loading Creep Behavior of Red Sandstone after Thermal Treatments and a Creep Damage Model

Yang

Ranjith

et al. 2018

Energies

Self Cite

View full text Add to dashboard Cite

Abstract:Triaxial compressive creep tests were conducted on red sandstones after different thermal treatments. Subsequently, the thermal influence on the axial, lateral and volumetric creep curves under various stress levels was analyzed. The results show that both the instantaneous and time-based deformation behaviors depended largely on the stress and temperature conditions. The instant axial strain increases linearly with increasing deviator stress and the instant deformation modulus decreases non-linearly with temperature. An interesting phenomenon was observed whereby the lateral creep strain had an apparent linear correlation with the axial creep strain. Furthermore, the fitting lines' slopes of lateral and axial creep strain increase gradually with the increasing deviator stress at identical temperature and first decreases and then increases as temperature is elevated. Then, on the basis of the Burgers creep model and the concept of strain energy, a creep damage model implemented in FLAC 3D (Fast Lagrangian Analysis of Continua 3D) is presented, and this model was able to describe the entire creep process completely including primary creep stage, secondary creep stage, and tertiary creep stage comparing with the experimental and theoretical results based on test data and numerical calculations. The influence of two damage parameters on creep curves and the thermal influence on creep parameters are subsequently discussed. Under the same stress level, the parameters K, G M and G K and η K of creep model decrease with temperature, while the parameter η M first augments as temperature rise to 300 • C and then decreases as temperature at above 300 • C. The higher is the temperature, the smaller the critical stress ratio (CSR).

show abstract

An experimental investigation on thermal damage and failure mechanical behavior of granite after exposure to different high temperature treatments

Cited by 488 publications

References 39 publications

The Effects of NaCl Concentration and Confining Pressure on Mechanical and Acoustic Behaviors of Brine-Saturated Sandstone

The Effects of NaCl Concentration and Confining Pressure on Mechanical and Acoustic Behaviors of Brine-Saturated Sandstone

Experimental investigation of mechanical properties and energy features of granite after heat treatment under different loading paths

Multi-Step Loading Creep Behavior of Red Sandstone after Thermal Treatments and a Creep Damage Model

Contact Info

Product

Resources

About