Study of the deformation characteristics and fracture criterion of the mixed mode fracture toughness of gypsum interlayers from Yunying salt cavern under a confining pressure

Meng, Tao; Zhang, Donghua; Hu, Yue; Xie, Jianlin; Song, Sufang; Li, Xiaoming

doi:10.1016/j.jngse.2018.07.020

Cited by 27 publications

(11 citation statements)

References 32 publications

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“…By analyzing the similarity of the curves in Figure 7 and the envelope of the measured dynamic stress-strain curves, the value of m can be estimated. After the values of m is determined, the maximum value of σ * is obtained by formula (26), and the parameter α is calculated by formula (27), which is deduced by Tang [42].…”

Section: Determination Of Damage Evolution Equationmentioning

confidence: 99%

“…Because rock is the product of geological process, its characteristics affected mechanical properties are discontinuous, anisotropic inhomogeneous etc. For example, the rock strength under impact load is much greater than that under static stress [21][22][23], and the rock changes from brittleness to toughness under high confining pressure [24][25][26][27]. erefore, it can be see that there are many complex factors which affect the rock constitutive model, and a large number of studies have been carried out by scholars.…”

Section: Introductionmentioning

confidence: 99%

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Damage Characteristics and Constitutive Model of Deep Rock under Frequent Impact Disturbances in the Process of Unloading High Static Stress

et al. 2020

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During the mining of deep mineral resources, the rock is in the complex mechanical environment of high crustal stress and blasting excavation unloading, and the improved SHPB test system is used to carry out frequent impact disturbance test of deep rock in the process of unloading high static stress. Firstly, the general characteristics of dynamic stress-strain curve envelope of the whole process trend can be divided into four stages: the stable development stage of micro cracks, the non-stable development stage of micro cracks, the fatigue damage stage, and the fatigue failure stage. Then, the damage variables of the rock are defined by continuous factors, strain equivalence principle and statistical damage theory, which are based on the whole deformation characteristics of rock during the test. And the derived damage variable equation of rock in the damage process is proved to be reasonable, and the damage constitutive model of rock under frequent disturbances in the process of unloading high static stress is established by the combined model method. Finally, the rationality of constitutive equation is verified by test data, which shows that the dynamic stress-strain curve envelope is in good consistency with the theoretical curve of constitutive equation.

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Section: Determination Of Damage Evolution Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Damage Characteristics and Constitutive Model of Deep Rock under Frequent Impact Disturbances in the Process of Unloading High Static Stress

et al. 2020

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“…Toughness. In fracture mechanics, there are three types of fracture: mode I (tensile fracture), mode II (shear fracture), and mode III (out-of-plane tearing fracture) [20][21][22][23][24][25][26][27][28][29]. Among them, mode I fracture is the most frequently encountered in underground geotechnical engineering [20,30,31].…”

Section: Scb Specimens and Calculation Of Mode I Fracturementioning

confidence: 99%

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Zhang

2019

Advances in Materials Science and Engineering

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To evaluate the stability and compactness of high-temperature underground construction, it is necessary to test the fracture toughness of surrounding rock (red sandstone) under real-time high temperature. In this paper, SCB specimens recommended by the International Society for Rock Mechanics are used to measure the mode I fracture toughness of red sandstone at real-time high temperatures. Also, to reveal its fracture characteristics and fracture mechanism, the fracture morphology observation (SEM experiment), XRD experiment, mercury intrusion porosimetry testing, and fractal measurement of fracture trajectory are carried out on the red sandstone specimens at various temperatures. The results show that (1) temperature may have a significant impact on the fracture toughness and fracture characteristics of red sandstone. On the whole, the fracture toughness values decrease with the increase in temperature, while the fractal dimensions of fractal trajectories increase with the increase in temperature. (2) Temperature has a significant influence on the fracture mode of red sandstone. At relatively low temperatures (20°C–400°C), the main fracture mode is transgranular failure. At relatively high temperatures (400°C–700°C), the fracture mode is mainly intergranular failure. (3) The weakening mechanism of red sandstone is mainly due to the effect of thermal dehydration when the temperature is between 100°C and 400°C. When the temperature is between 400°C and 700°C, the weakening mechanism is mainly due to thermal cracking and the α-β phase transition of quartz.

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“…Storing cycles in depleted reservoirs are mainly limited to less than two times per year (Joskow, 2012). The reservoir pressure fluctuates during these cycles (Meng et al, 2015;Meng et al, 2018), changing geomechanical properties of the reservoir formation and induced stresses affecting surrounding stratum, such as caprock (Raza et al, 2016). Caprock primarily provides a seal that traps hydrocarbon or other fluids from migrating into confining layers, so during the lifetime of the UGS facility, any symptom changing the caprock integrity should be considered (Streit and Hillis, 2004).…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of Cyclic Loading Conditions and Computed Tomography for the Strength and Petrophysical Properties of Anhydrite Caprock

Farrokhi

Jalalifar

Nasab

2021

MGPB

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Underground gas storage (UGS) in depleted reservoirs affects caprock properties. The resemblance of Qom anhydrite outcrop with cutting obtained from a 2629 m depth was confirmed using X-ray diffraction (XRD) results and scanning electron microscope (SEM) tests. The anhydrite specimens unconfined compressive strength (UCS) changed under static cyclic loading conditions, and also petrophysical properties, such as porosity and permeability altered under 10, 20, and 30 cycles of loading. The magnitude of loading ranged from 30 to 43% of intact anhydrite UCS. The loading rate used for cyclic loading tests was 0.004 mm/s. The samples’ UCS decreased between 3.5 to 23.9% under cyclic loading conditions. The study of specimens computed tomography (CT) imaging with porosity and permeability indicated the growth of cracks, the cracks did not initiate in all lengths of specimens, hence the incremental increase in porosity did not increase the permeability of specimens. Even being under cyclic loads, the permeability of specimens stayed lower than 10-15 m2 (0.001 mD) but the trend of pressure versus time for measuring permeability shows a higher drop in pressure due to changes in permeability. The study indicated that the CT imaging results are in good accordance with petrophysical findings.

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Study of the deformation characteristics and fracture criterion of the mixed mode fracture toughness of gypsum interlayers from Yunying salt cavern under a confining pressure

Cited by 27 publications

References 32 publications

Damage Characteristics and Constitutive Model of Deep Rock under Frequent Impact Disturbances in the Process of Unloading High Static Stress

Damage Characteristics and Constitutive Model of Deep Rock under Frequent Impact Disturbances in the Process of Unloading High Static Stress

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

An Evaluation of Cyclic Loading Conditions and Computed Tomography for the Strength and Petrophysical Properties of Anhydrite Caprock

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