The effect of temperature on the mechanical properties and workability of rock salt

Małkowski, Piotr; Bednarek, Łukasz; Kotwica, Krzysztof; Stopka, Grzegorz

doi:10.2478/ntpe-2019-0041

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…Thus, the peak strengths of heated samples are evidently higher than that of the non-heated samples due to the augmented ductility (see Figs 7 and 10 ). That result is also compatible with the findings of Liang et al [ 13 ] and Malkowski et al [ 38 ].…”

Section: Discussionsupporting

confidence: 94%

Thermal effect on the geo-engineering characteristics of a rock salt

Özcan

2023

PLoS ONE

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Rock salt caverns are considered one of the best hosts to store oil, natural gas, radioactive and toxic wastes due to their low permeability, self-healing characteristics and wide distribution on the Earth. Stored nuclear waste in rock salts will radiate for many years. Therefore, the thermal energy and also temperature in the host environment will increase depending on time. In this study, P-wave velocity (Vp), Brazilian tensile strength (σt), uniaxial compression strength (σc) of Çankırı rock salt were investigated under different temperatures ranging from 20°C to 250°C since the temperature is a factor that causes changes in some physical and geo-mechanical properties of rocks. The acoustic emission technique was utilized during uniaxial compression strength tests, to monitor the crack accumulation. Additionally, X-ray micro-computed tomography technique was employed to observe the microstructure and determine the porosity of rock salt samples depending on the temperature. The Vp and the σt of Çankırı rock salt decrease with increasing temperatures of samples whereas the σc increases. The ductility of rock salt tends to increase with augmented temperature and the axial strain at the ultimate stress level is 2.96% at 20°C whereas it reaches up to 6.29% at 250°C. The AE activity of rock salt generates at the early stages of loading and AE count prominently increases with the increasing temperature of samples. Therefore, the stress levels of crack initiation (σi) and crack damage (σcd) thresholds were reached earlier than the previous one with each temperature increment. According to X-ray micro-CT images of rock salts, the number of cracks increased markedly in thermally treated rock salt samples and therewith the porosity increases from 1.12% to 2.73% with an increase in temperature from 50°C to 250°C.

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Section: Discussionsupporting

confidence: 94%

Thermal effect on the geo-engineering characteristics of a rock salt

Özcan

2023

PLoS ONE

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“…Rock salts, as well as shale rocks have a relatively high tensile strength of 20 to 180 bar, which means that they should not be damaged even during the large CO2 injection (Małkowski et al 2019). Carbon dioxide can be used also in the process of enhanced oil or gas recovery.…”

Section: Physical and Technological Requirements For Ccs Trapsmentioning

confidence: 99%

Geological built and potential CCS perspectives in northern Poland

Kusek¹

2021

Environ. Earth Ecol.

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The world has been struggling with global warming for many years. One way to reduce this phenomenon is to limit anthropogenic carbon dioxide emission to the atmosphere, which is partly responsible for contemporary climate change. This problem is international, but each country is obliged to follow general recommendations. In Poland, the idea of underground carbon sequestration (CCS) is increasingly being considered in the last decade. Northern Poland seems to be one of the perspective areas. For this reason, the following article describes the possibility of underground CO2 injection in this area. It contains the detailed description of the geological structure of Northern Poland. Types of underground structures for sequestration were also selected. The article also describes the technical conditions for the CO2 injection process. The most numerous group of boreholes suitable for CCS are those with documented oil or gas deposits. They are usually Upper Permian, and less often Middle Cambrian or Silurian hydrocarbon geological traps, where CO2 can be used in the enhanced oil and gas recovery. There are also several boreholes with saline aquifers.

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“…It has achieved tremendous progress and fruitful results [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Some scholars have conducted experimental studies on the influence of temperature on rock physical and mechanical parameters, such as rock peak strength, Young’s modulus, Poisson’s ratio, and porosity, etc., and investigated the change of pore structure and mechanical properties of limestone exposed to acid solutions by series of triaxial and cyclic load tests [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. However, only under the action of temperature and chemical solution, the effect of rock on its mechanical properties is very different from the effect of the coupling of the two.…”

Section: Introductionmentioning

confidence: 99%

Study on Damage Statistical Constitutive Model of Triaxial Compression of Acid-Etched Rock under Coupling Effect of Temperature and Confining Pressure

Chen

Peng

et al. 2021

Materials

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Based on Lemaitre’s strain equivalence hypothesis theory, it is assumed that the strength of acid-etching rock microelements under the coupling effect of temperature and confining pressure follows the Weibull distribution. Under the hypothesis that micro-element damage meets the D-P criterion and based on continuum damage mechanics and statistical theory, chemical damage variables, thermal damage variables and mechanical damage variables were introduced in the construction of damage evolution equations and constitutive models for acid-etching rocks considering the coupled effects of temperature and confining pressure. The required model parameters were obtained by theoretical derivation, and the model was verified based on the triaxial compression test data of granite. Comparing the experimental stress-strain curve with the theoretical stress-strain curve, the results show that they were in good agreement. By selecting reasonable model parameters, the damage statistical constitutive model can accurately reflect the stress-strain curve characteristics of rock in the process of triaxial compression. The comparison between the experimental and theoretical results also verifies the reasonableness and reliability of the model. This model provides a new rock damage statistical constitutive equation for the study of rock mechanics and its application in engineering, and has certain reference significance for rock underground engineering.

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The effect of temperature on the mechanical properties and workability of rock salt

Cited by 5 publications

References 6 publications

Thermal effect on the geo-engineering characteristics of a rock salt

Thermal effect on the geo-engineering characteristics of a rock salt

Geological built and potential CCS perspectives in northern Poland

Study on Damage Statistical Constitutive Model of Triaxial Compression of Acid-Etched Rock under Coupling Effect of Temperature and Confining Pressure

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