Time Interval Effect in Triaxial Discontinuous Cyclic Compression Tests and Simulations for the Residual Stress in Rock Salt

Fan, Jinyang; Liu, Wei; Jiang, Deyi; Chen, Jie; Tiedeu, William Ngaha; Daemen, J.J.K.

doi:10.1007/s00603-020-02150-y

Cited by 92 publications

(36 citation statements)

References 61 publications

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“…Salt rock has the characteristics of low porosity, low permeability, and strong self-healing ability of damage, and is recognised as an ideal medium for underground storage of natural gas, oil, and other energy resources (Liu et al, 2020a;Peng et al, 2020). The long-term operation process of salt rock underground gas storage consists of four stages: low-pressure operation, gas injection and pressurisation, high-pressure operation, and gas recovery and depressurisation (Fan et al, 2020;Wang et al, 2021;Wu et al, 2020a). In the stage of gas recovery and depressurisation, the pressure of the underground gas storage gradually decreases, and the unbalanced force of the surrounding rock gradually increases.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Wang

Zhang

Song

et al. 2021

International Journal of Damage Mechanics

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To study the effect of loading rate on the mechanical properties of salt rock, uniaxial compression tests and acoustic emission tests at different loading rates were carried out on salt rock specimens. The test results show that with increases in loading rate, the peak stress of salt rock increases first and then essentially remains unchanged, and the elastic modulus increases gradually, while the strain at peak stress decreases gradually. Moreover, the Poisson’s ratio is independent of loading rate. The macroscopic failure modes of the salt rock specimens at different loading rates are all ‘X’-type conjugate shear failure. However, the loading rate is closely related to the degree of fracture, such that the smaller the loading rate is, the higher is the degree of fracture of salt rock. In order to describe the stress–strain behaviour in the process of salt rock failure, a damage variable expression represented by the deformation modulus was proposed, and a rock damage constitutive model was established according to the theory of continuum damage mechanics. The rationality of the damage constitutive model was verified by using the present uniaxial compression test results of salt rock and existing test data from the literature. The results show that the model can accurately describe the stress–strain response of rock in the failure process.

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Section: Introductionmentioning

confidence: 99%

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Wang

Zhang

Song

et al. 2021

International Journal of Damage Mechanics

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“…With the large-scale construction and operation of salt rock underground storage, how to improve the effective storage capacity of salt rock underground storage and ensure the safety and stability of its long-term operation has become a hot issue of current research [12][13][14][15]. In recent years, related scholars have conducted a large number of in-depth studies on the stability of salt rock underground storage from the aspects of influencing factors and stability evaluation [16][17][18][19][20]. Xing et al [21] conducted numerical simulation analysis on the long-term stability of salt rock underground storage with different sizes and different minimum internal pressures from the aspects of convergence, damage, dilatancy ratio, and effective strain.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis on the Long‐Term Operation of the Horizontal Salt Rock Underground Storage

Zhang

et al. 2021

Advances in Civil Engineering

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The construction of the vertical cavern in the salt dome deposit can meet the requirements of both storage capacity and tightness. However, if the vertical cavern is still used as the design shape of the salt rock underground storage in the layered salt rock deposit, the high design capacity cannot be guaranteed while the tightness is satisfied. In this case, the use of a large-span horizontal cavern as the design shape of the salt rock storage can not only effectively increase the design capacity of the storage, but also solve the problems such as the stability and tightness of the storage during the operation period by improving the structural form and working mode. Based on this, the ellipsoid-shaped horizontal salt rock underground storage is taken as an example, and a single-cavern horizontal salt rock underground storage model with different diameter-to-height ratios is established by using FLAC3D software. The change law of vertical and horizontal displacements, volume loss rate, and plastic zone distribution of salt rock storage changing with the diameter-to-height ratio are studied, and the optimal diameter-to-height ratio is determined. And then the long-term operation process of the double-cavern horizontal salt rock underground storage under the optimal diameter-to-height ratio is simulated, and the optimal pillar width is obtained.

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“…To assess backfills with different cement/sand ratios and slurry concentrations, scholars have conducted related strength research and obtained the influence law of backfill strength [11][12][13][14][15][16][17]. Scholars have done relevant research on the failure characteristics of different rocks [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Influencing Factors on Strength of Waste Rock Tailing Cemented Backfill

et al. 2020

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Tailing cement filling is an important development direction in mine filling, as it is a green and environmentally friendly method for efficiently treating solid waste in mines. Adding a certain amount of waste rock can effectively improve the backfill strength and better meet the filling strength requirements. To address the use of waste rock tailings in cemented filling materials, a uniaxial compression test was carried out on backfills with different cement/sand ratios and waste rock contents, and the influence of the cement/sand ratio and waste rock content on the strength of the backfill was studied. This study found that when the waste rock content is certain, the strength of the backfill increases with the increase in the cement/sand ratio, and the increase in strength slows with the increase in the cement/sand ratio until the strength of the backfill reaches a limit and no longer increases. When the cement/sand ratio is constant, the strength of the backfill first increases and then decreases as the waste rock content increases. When the cement content is constant, the addition of a certain amount of waste rock reduces the specific surface area of the solid materials in the backfill, increases the amount of cement per unit area, and improves the strength of the backfill. When the waste rock content is too high, due to the large particle size of the waste rock, the tailings cannot completely wrap around the waste rock, resulting in a weakening of the cement in the backfill, which reduces the strength of the backfill. This study found that the waste rock content and the cement/sand ratio in the backfill have a significant impact on backfill damage. The damage is mainly caused by insufficient cement strength. The presence of waste rock will change the original direction of crack propagation, resulting in more crack bifurcation, and the form of the destruction surface on the backfill is complicated and diverse.

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Time Interval Effect in Triaxial Discontinuous Cyclic Compression Tests and Simulations for the Residual Stress in Rock Salt

Cited by 92 publications

References 61 publications

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Stability Analysis on the Long‐Term Operation of the Horizontal Salt Rock Underground Storage

Influencing Factors on Strength of Waste Rock Tailing Cemented Backfill

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