Experimental study on mode I and mode II fracture properties of heated sandstone after two different cooling treatments

Hua, Wen; Li, Jianxiong; Zhu, Zhanyuan; Li, Anqing; Huang, Jiuzhou; Dong, Shiyun

doi:10.1016/j.gete.2023.100448

Cited by 21 publications

(2 citation statements)

References 71 publications

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“…From the figure, it can be learned that the load-displacement curve at the beginning of loading shows nonlinearity. This is because the pores inside the sandstone specimen are compacted, and the cracks tend to close up [52]. After that, with the increase of load, displacement linearly increases.…”

Section: Preparation and Proceduresmentioning

confidence: 98%

“…Additionally, water infiltrates the interior of the rock through fractures and pores during the cooling process, resulting in the dissolution of certain soluble minerals and cementation, thereby compromising interparticle bonding. Hua et al [52] and Liu et al [39] also pointed out that plagioclase green mudstone in sandstone is most easily dissolved and lost. Furthermore, the reduction in bonding strength does not exhibit recovery upon rock desiccation but rather accumulates with increasing cycles.…”

Section: Degradation Damage Mechanism Analysismentioning

confidence: 99%

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Experimental Study on the Effect of Cyclic Heating and Water Cooling on Mixed-Mode I-II Fracture Characteristics of Sandstone

Zhang,

Hua,

Zhou

et al. 2024

Buildings

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In the process of underground resource extraction, deep rock masses are often subjected to cyclic-heating and water-cooling effects, which cause significant damage to the mechanical properties of rocks. In order to study the degradation mechanism of sandstone under cyclic heating and water cooling, many fracture experiments have been carried out. The effect of cyclic heating and water cooling at 200 °C on the tensile strength and the mixed-mode I-II fracture toughness of sandstone was investigated. The similarities and differences in the rock fracture characteristics and deterioration response of tensile properties are also examined. Meanwhile, the correlation between the microstructure and macroscopic fracture mechanical properties was revealed by observing the evolutionary pattern of rock microstructure. The findings demonstrate that the heating and water-cooling-induced variations in the tensile strength and fracture toughness of rock exhibit a consistent trend. The effective fracture toughness of sandstone decreases exponentially with increasing cycle times. The impact of the heating and water-cooling cycles on the fracture toughness of pure mode I is found to be more pronounced compared to that observed in mixed modes and pure mode II specimens. The failure mode of the rock sample undergoes a transition from abrupt to gradual, accompanied by an augmented development of cracks on the failure surface and finer fragmentation of rock debris. The results of this study can provide theoretical references for engineering practices such as the exploitation of geothermal resources and hydraulic fracturing.

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Section: Preparation and Proceduresmentioning

confidence: 98%

Section: Degradation Damage Mechanism Analysismentioning

confidence: 99%