Time-dependence of mechanical behavior of Shikotsu welded tuff at sub-zero temperatures

Kodama, Junichi; Mitsui, Yoshitaka; Hara, Syohei; Fukuda, Daisuke; Fujii, Yoshiyuki; Sainoki, Atsushi; Karakus, Murat

doi:10.1016/j.coldregions.2019.102868

Cited by 12 publications

(4 citation statements)

References 48 publications

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“…Whilst high-temperature characterisations are beneficial for geothermal energy applications and conventional CO 2 injection, investigation of mechanical properties of sandstones at low temperatures (T < 0 °C) are mainly focussing on freeze-thaw loading such as the work of Liping et al (2019), Yahaghi et al (2021), Huang et al (2022), Fakhri et al (2023 and Yu et al (2023). UCS and triaxial tests for mechanical characterisation of sandstone at certain sub-zero temperatures are limited according to Kodama et al (2019). Some of the studies are the low-temperature UCS tests by Liu et al (2020) and Zhang et al (2023), demonstrated a reduction in sandstone's strength with decreasing temperature.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Cooling on Fine-Grained Sandstone in Relation to Wellbore Injection of Carbon Dioxide

et al. 2023

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In Carbon Capture and Storage (CCS) procedures, it is important to determine the stability of the wellbore during carbon dioxide (CO2) injection and part of this involves assessing stresses on the rock near the wellbore due to changes in temperature and pressure. To address this, this study investigated the influence of cooling on the mechanical properties of a sandstone typical of those found in the central and southern North Sea. A series of uniaxial and triaxial compression tests was conducted on dry and saturated sandstone samples to determine the effects of cooling on the strength and stiffness under different confining pressures. The elastic modulus, shear modulus, bulk modulus and Poisson’s ratio were determined for three temperature conditions and three pressures representing different depths in a wellbore. Two methods, the International Society of Rock Mechanics (ISRM) and Wood’s (Soil behaviour and critical state soil mechanics. Cambridge University Press, Cambridge, 1990), were used to determine the mechanical properties of the rock during the Uniaxial Compressive Strength (UCS) tests. For the triaxial test, only Wood’s (1990) method was applied due to the existence of confining pressure. Microstructural analysis on thin sections of the sandstones under plane and crossed polarised light conditions in the deformed and undeformed state was conducted to elucidate deformation mechanisms and aid interpretation of experimental results. It was identified that both an increase in confinement and a reduction in temperature, increased the strength of the sandstone and reduced the Poisson’s ratio. Additionally, by decreasing the temperature, especially in the UCS test the material dilated less. This is an important outcome as expanding the results to a wellbore stability problem, brittle behaviour may be more apparent and damage may occur when sub-zero injection temperatures are applied, especially at the wellbore head, where confinement is low.

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Section: Introductionmentioning

confidence: 99%

The Effects of Cooling on Fine-Grained Sandstone in Relation to Wellbore Injection of Carbon Dioxide

et al. 2023

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“…It can be interpreted that the strength of frozen rocks is related not only to the mineral composition of rock itself but also to the formation of pore ice. Kodama et al (2019) investigated the long term behavior of Shikotsu welded tuff at subzero temperatures. The results illustrated that the UCS of frozen wet specimens were greater than those of the frozen dry specimens.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Mechanical Properties of Dry, Saturated, and Frozen Marls Using Destructive and Non-destructive Laboratory Approaches

Davarpanah

Sharghi

Tarifard

et al. 2021

Iran J Sci Technol Trans Civ Eng

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The mechanical properties of frozen rocks vary significantly from the properties of the same lithology under ambient temperature. The goal of this paper is to investigate these changes in the physical and mechanical properties of rocks due to saturation and freezing. Besides, the attention was paid on discovering new correlations between the mechanical characteristics. To fulfill these objectives, 36 uniaxial compressive strength tests, 36 Brazilian splitting tests, and 48 point load tests were carried out. The samples were tested in air dry, water saturated, and frozen (− 20 °C) conditions. The measured physical and mechanical parameters were analyzed by using regression analyses. It was found that the average uniaxial compressive strength of frozen samples (21.93 MPa) is 86.4% more than saturated ones (11.76 MPa) but 25.9% less than dry specimens (29.62 MPa). Additionally, high correlations were established between uniaxial compressive strength and IS(50) under air-dry, saturated, and frozen conditions for the investigated marl samples. Furthermore, it is of particular interest to observe a high correlation with the determination coefficient (R2 = 0.95) between the constants of previously published linear regressions of UCS- Is(50) under dry status.

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“…(2019) found that temperature has a significant effect on the rheological properties of frozen sand; considering the influence of time and stress, and introducing a damage variable to improve the viscoplastic element, a new nonlinear creep constitutive model of frozen sand was proposed. Kodama et al. (2019) investigated the impact of the water content of specimens on the time-dependence of mechanical behavior and found that pore ice had a great influence on the deformation and failure of frozen wet rock specimens.…”

Section: Introductionmentioning

confidence: 99%

“…Zhu et al (2019) found that temperature has a significant effect on the rheological properties of frozen sand; considering the influence of time and stress, and introducing a damage variable to improve the viscoplastic element, a new nonlinear creep constitutive model of frozen sand was proposed. Kodama et al (2019) investigated the impact of the water content of specimens on the time-dependence of mechanical behavior and found that pore ice had a great influence on the deformation and failure of frozen wet rock specimens. Shan et al (2019) determined that the dip angle of a joint plane has a great influence on the creep characteristics of rock specimens and identified the parameters of the test data by using the proposed creep model to verify the correctness of the model.…”

Section: Introductionmentioning

confidence: 99%

Study on triaxial creep behavior and the damage constitutive model of red sandstone containing a single ice-filled flaw

Bai

Shan

Han

et al. 2020

International Journal of Damage Mechanics

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The freezing method is widely used in the construction of vertical shafts in water-rich strata. The formed frozen rock wall is often involved in the creep process, and in particular, the creep behavior of frozen fissured rock mass poses a great threat to construction safety. To better understand the creep instability law of ice-filled, fractured red sandstone under freezing and triaxial stress conditions, a series of triaxial creep tests on frozen red sandstone specimens containing a single, pre-existing flaw at −10°C and under a confining pressure of 4 MPa were carried out with a self-developed DRTS-500 subzero rock triaxial testing system. The multistage loading creep curves were obtained, and the evolution laws of deformation and damage for the frozen specimens in the primary (instantaneous), secondary (steady-state) and tertiary (accelerating) phases were analyzed. The nonlinear visco-elastoplastic constitutive model of red sandstone with a single ice-filled flaw was established according to the fractional calculus theory and the Kachanov damage theory. The results show that the initial creep property, unstable creep property and creep failure mode of frozen single-flaw red sandstone are significantly affected by the flaw dip angle. The proposed creep damage model can accurately describe the complete creep curves of frozen red sandstone with a single ice-filled flaw, especially in the unstable creep stage. The influences of the stress level and flaw dip angle on the creep parameters were analyzed, and sensitivity analyses of the characteristic creep parameters were carried out to verify the reliability and rationality of our creep model. This research can be applied to the assessment of collapse, cracking and other long-term failures and hence can be used as a theoretical basis of design in the freezing engineering of coal mine shafts.

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Time-dependence of mechanical behavior of Shikotsu welded tuff at sub-zero temperatures

Cited by 12 publications

References 48 publications

The Effects of Cooling on Fine-Grained Sandstone in Relation to Wellbore Injection of Carbon Dioxide

The Effects of Cooling on Fine-Grained Sandstone in Relation to Wellbore Injection of Carbon Dioxide

Studies on the Mechanical Properties of Dry, Saturated, and Frozen Marls Using Destructive and Non-destructive Laboratory Approaches

Study on triaxial creep behavior and the damage constitutive model of red sandstone containing a single ice-filled flaw

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