Experimental analysis on the mechanical characteristic of single-fractured rock masses under the freeze–thaw condition: Experimental analysis on the mechanical characteristic of single-fractured rock masses under the freeze–thaw condition

Lu, Yani; Li, Xinping; Wu, Xinghong

doi:10.1201/b19635-51

Cited by 2 publications

(2 citation statements)

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“…Local cracks gradually occur in the rock, and the stress concentration gradually moves to the crack tip, thus promoting the continuous development of cracks in this area. Prefabricated cracks change the stress field distribution of the original uniform damaged medium, and the ends of the cracks are prone to stress concentration, so the main cracks often originate from the ends of the prefabricated cracks [29]. The main branch cracks generated at the end of the prefabricated crack are the following: ① wing crack; ② anti-wing crack; ③ secondary coplanar crack; ④ secondary inclined crack; ⑤ branch crack.…”

Section: Single Crack Tip Crack Propagation Modementioning

confidence: 99%

Study on the Damage Characteristics and Internal Variable Modeling of Single-Fracture Sandstone under the Coupling Effect of Freeze–Thaw and Fatigue Load

Zhang,

Chang,

Ren

et al. 2024

Applied Sciences

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The fractured rock mass in the western cold region is affected by freezing and thawing disasters and is prone to local damage and fracture along the fissures’ ends. The fatigue damage induced by repeated frost heave and traffic loads seriously endangers the stability of cold region roadbed. This paper selects sandstone as the research object. Firstly, 20 freeze–thaw cycles were performed on fractured sandstone samples with different inclination angles of 30°, 45°, 60°, and 90°. Subsequently, triaxial compression and triaxial fatigue loading tests were conducted to explore the mechanical properties and fracture morphology evolution mechanism during the compression process of freeze–thaw fractured sandstone. Nuclear magnetic resonance technology (NMR) was used to measure the H-containing fluid inside rock pores. The microscopic damage characteristics inside the rock were analyzed from the NMR T2 relaxation spectrum signal and pore size distribution characteristics. Based on the internal variable theory of continuum mechanics, a fatigue model of freeze–thaw fractured sandstone with different inclination angles was established. The results show that sandstone strength was negatively correlated with the fracture dip angle, and the axial deformation and shear failure angle were positively correlated with the fracture dip angle. The mechanical properties of the sandstone were deteriorated by fatigue loading. When the crack angle was 90°, the fatigue failure strength of the rock sample was the lowest. The T2 spectrum distribution of the fractured sandstone mainly had three peaks and the pore size was mainly medium and small pores. There was a small leftward shift after freeze–thaw cycles and fatigue loading. The T2 spectrum area was significantly affected by fatigue loading, with the highest rate of change at a crack angle of 30°. Through the fine correspondence between the axial residual deformation and the deformation modulus, a fatigue model with different crack inclination angles was established using the axial residual deformation as the internal variable, and the rationality of the model was verified by fatigue loading tests.

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Section: Single Crack Tip Crack Propagation Modementioning

confidence: 99%

Study on the Damage Characteristics and Internal Variable Modeling of Single-Fracture Sandstone under the Coupling Effect of Freeze–Thaw and Fatigue Load

Zhang,

Chang,

Ren

et al. 2024

Applied Sciences

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“…Feng [40] analyzed the influences of water chemical corrosion on rock triaxial compressive strength, uniaxial compressive strength, shear strength, tensile strength, and cracking characteristics. Lu [41] conducted water-rock reaction experiments in fractured sandstone and analyzed the influence of fine microstructure and structural chemical corrosion on water-rock reaction. Smith [42] conducted field tests combined with hydrogeological surveys, and the results showed that the self-occurrence of carbonate reservoirs and the deposition of anhydrite layer during water-rock reaction had a positive effect on the storage of CO 2 -H 2 S acid gas.…”

Section: Supercritical Co 2 -Water-rock Reaction Experiments and Coup...mentioning

confidence: 99%

Review on the Mechanism of CO2 Storage and Enhanced Gas Recovery in Carbonate Sour Gas Reservoir

et al. 2023

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Carbonate gas reservoirs in the Sichuan Basin have many complex characteristics, such as wide distribution, strong heterogeneity, high temperature, high pressure, high H2S and CO2 content and an active edge or bottom water. In the late stage of exploitation of carbonate sour gas reservoirs, the underground depleted reservoirs can provide a broad and favorable space for CO2 storage. If CO2 is injected into the depleted carbonate sour reservoirs for storage, it will help to achieve the goal of carbon neutrality, and the CO2 stored underground can perform as “cushion gas” to prevent the advance of edge or bottom water, to achieve the purpose of enhanced natural gas recovery. Injecting CO2 into low permeability reservoirs for oil displacement has become an important means to enhance oil recovery (EOR). However, the mechanism of EOR by injecting CO2 into carbonate sour gas reservoirs is not clear and the related fundamental research and field application technology are still in the exploration stage. This paper reviews the main scientific and technical perspectives in the process of injecting CO2 into carbonate sour gas reservoirs for storage and enhancing gas recovery.

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Experimental analysis on the mechanical characteristic of single-fractured rock masses under the freeze–thaw condition: Experimental analysis on the mechanical characteristic of single-fractured rock masses under the freeze–thaw condition

Cited by 2 publications

References 0 publications

Study on the Damage Characteristics and Internal Variable Modeling of Single-Fracture Sandstone under the Coupling Effect of Freeze–Thaw and Fatigue Load

Study on the Damage Characteristics and Internal Variable Modeling of Single-Fracture Sandstone under the Coupling Effect of Freeze–Thaw and Fatigue Load

Review on the Mechanism of CO2 Storage and Enhanced Gas Recovery in Carbonate Sour Gas Reservoir

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