Application of modified fracture criteria incorporating T-stress for various cracked specimens under mixed mode I-II loading

Hua, Wen; Zhu, Zhanyuan; Zhang, Wenyu; Li, Jianxiong; Huang, Jiuzhou; Dong, Shiming

doi:10.1016/j.tafmec.2023.104184

Cited by 16 publications

(1 citation statement)

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“…In the process of deep oil and gas exploitation, high-temperature and high-pressure rocks experience rapid cooling due to the influence of drilling fluid or injected water. This abrupt temperature change inevitably induces thermal damage to the rock mass, thereby impacting its physical and mechanical properties as well as microstructure characteristics [15][16][17][18][19]. The thermal damage is a consequence of the combined effects of mineral particle expansion and contraction, heating and water cooling, and thermophysical-chemical transformations.…”

Section: Introductionmentioning

confidence: 99%

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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