Variable Parameter Creep Model Based on the Separation of Viscoelastic and Viscoplastic Deformations

Liu, Wenbo; Liu, Wenbo; Zhang, Shuguang; Zhao, Chengwei

doi:10.1007/s00603-023-03266-7

Cited by 31 publications

(7 citation statements)

References 32 publications

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“…Rock creep behavior as a challenging and significant topic has a considerable application in geotechnical and mining engineering (Tarifard et al 2022). Underground energy storage facilities, oil and gas well drilling, and longterm stability of deep underground spaces and mining operations are some applications of creep analysis in rock engineering projects (Sharifzadeh et al 2013;Firme et al 2018;Dehghan and Khodaei 2021;Liu et al 2023). Many factors also affect the creep behavior of rocks, such as temperature, stress level, rock anisotropy, water content, etc., which highlight the intricate nature of rocks' creep behavior (Li et al 2020b;Shan et al 2021;Kou et al 2023).…”

Section: List Of Symbols 𝜀 εmentioning

confidence: 99%

Review of the creep constitutive models for rocks and the application of creep analysis in geomechanics

Tarifard,

Török,

Görög

2024

Rock Mech Rock Eng

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The creep behavior of rocks has been broadly researched because of its extensive application in geomechanics. Since the time-dependent stability of underground constructions is a critical aspect of geotechnical engineering, a comprehensive understanding of the creep behavior of rocks plays a pivotal role in ensuring the safety of such structures. Various factors, including stress level, temperature, rock damage, water content, rock anisotropy, etc., can influence rocks’ creep characteristics. One of the main topics in the creep analysis of rocks is the constitutive models, which can be categorized into empirical, component, and mechanism-based models. In this research, the previously proposed creep models were reviewed, and their main characteristics were discussed. The effectiveness of the models in simulating the accelerated phase of rock creep was evaluated by comparing their performance with the creep test results of different types of rocks. The application of rock’s creep analysis in different engineering projects and adopting appropriate creep properties for rock mass were also examined. The primary limitation associated with empirical and classical component models lies in their challenges when it comes to modeling the tertiary phase of rock creep. The mechanism-based models have demonstrated success in effectively simulating the complete creep phases; nevertheless, additional validation is crucial to establish their broader applicability. However, further investigation is still required to develop creep models specific to rock mass. In this paper, we attempted to review and discuss the most recent studies in creep analysis of rocks that can be used by researchers conducting creep analysis in geomechanics.

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Section: List Of Symbols 𝜀 εmentioning

confidence: 99%

Review of the creep constitutive models for rocks and the application of creep analysis in geomechanics

Tarifard,

Török,

Görög

2024

Rock Mech Rock Eng

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“…In recent years, many scholars have done a lot of research work on the theory of viscoelastic plasticity of rocks. Liu Wenbo et al [9] separated the creep strain into instantaneous strain, viscoelastic strain and viscoplastic strain according to the characteristics of the creep curve, and established a variable-parameter creep constitutive model of deformation separation according to the parameters introduced according to the viscoelastic-plastic strain characteristics. Bo Hu [10] carried out cyclic loading and unloading creep tests on rock samples with different fracture dip angles, and the results showed that the viscoelastic and viscoplastic strains of the samples with an inclination angle of 30° were greater than those of the samples with an inclination angle of 90° under the same stress, and the two strains increased nonlinearly with the increase of stress.…”

Section: Introductionmentioning

confidence: 99%

Constitutive model of Viscoelastic-plastic strain characteristics and damage of South China red sandstone under chemical environment

ZHANG,

ZHAO,

FAN

et al. 2024

Preprint

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In this paper, a graded creep cyclic loading and unloading test was carried out to explore the viscoelastic-plastic rheological characteristics of red sandstone in South China under acidic environment. The mechanical parameters and viscoelastic-plastic strain characteristics of the acidic solution corrosive specimen were obtained by analyzing the rock deformation behavior by the improved viscoelastic-plastic strain separation method, and the instantaneous strain was separated into instantaneous elastic strain and instantaneous plastic strain, and the creep-strain strain was separated into viscoelastic strain and viscoplastic strain. Based on the nonlinear rheological theory, the constitutive equations of creep damage of rock in one-dimensional and three-dimensional stress states are derived. The results show that acid corrosion has little effect on the resistance to elastic deformation of red sandstone, the elastic deformation modulus remains basically the same at the same stress level, and the instantaneous elastic strain and viscoelastic strain are close to linear relationship with the deviator stress. The increase of acidity of the solution increases the plastic deformation of rock samples, in which the instantaneous plastic modulus increases gradually with the increase of the number of loading and unloading, and the instantaneous plastic strain increment decreases. The viscoplastic modulus gradually decreases with the increase of stress level, and the increase of viscoplastic strain increases. The creep flexibility and creep rate of viscoplastic have the same trend with the change, and increase with the increase of solution concentration and stress level. By introducing the chemical damage variable considering the plastic deformation of the material, the creep damage constitutive equation considering the viscoelastic-plastic strain separation is established, which can describe the variation of strain with time during loading and unloading, and verifies the rationality and accuracy of the proposed model by comparing it with the traditional Nishihara model.

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“…Balakot, located in the Himalayan Mountains of Pakistan, has a rugged topography, fragile geology, active tectonics, and climatic conditions and is exposed to a high density of landslides. Climate change-induced erratic rainfall patterns, increasing temperatures in the area, and human intervention, including deforestation, excavation, and land use changes, have increased the frequency of landslides and pose a significant risk to the communities and infrastructure [25]. A comprehensive understanding of the underlying slope failure mechanism is required to characterize large-scale landslide deformation and potential triggers [4].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Geomorphic Change Detection of Landslides Using UAV Multi-Temporal Imagery in the Himalayas, Pakistan

Ahmad,

Shafique,

Hussain

et al. 2024

Land

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Multi-temporal unmanned aerial vehicle (UAV) imagery and topographic data were used to characterize and evaluate the geomorphic changes of two active landslides (Nara and Nokot) in Pakistan. Ortho-mosaic images and field-based investigations were utilized to assess the geomorphological changes, including the Topographic Wetness Index, slope, and displacement. Volumetric changes in specific areas of the landslides were measured using the Geomorphic Change Detection (GCD) tool. The depletion zone of the Nara landslide was characterized by failures of the main scarps, resulting in landslides causing erosional displacements exceeding 201.6 m. In contrast, for the Nokot landslide, the erosional displacement ranged from −201.05 m to −64.98 m. The transition zone of the slide experienced many slow earth flows that re-mobilized displaced material from the middle portion of the landslide, ultimately reaching the accumulation zone. Volumetric analysis of the Nara landslide indicated overall erosion of landslide material with a volume of approximately 4,565,274.96 m3, while the accumulated and surface-raising material volume was approximately 185,544.53 m3. Similarly, for the Nokot landslide, the overall erosion of landslide material was estimated to be 6,486,121.30 m3, with an accumulated volume and surface-raising material of 117.98 m3. This study has demonstrated the efficacy of the GCD tool as a robust and repeatable method for mapping and monitoring landslide dynamics with UAVs over a relatively long time series.

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Variable Parameter Creep Model Based on the Separation of Viscoelastic and Viscoplastic Deformations

Cited by 31 publications

References 32 publications

Review of the creep constitutive models for rocks and the application of creep analysis in geomechanics

Review of the creep constitutive models for rocks and the application of creep analysis in geomechanics

Constitutive model of Viscoelastic-plastic strain characteristics and damage of South China red sandstone under chemical environment

Characterization and Geomorphic Change Detection of Landslides Using UAV Multi-Temporal Imagery in the Himalayas, Pakistan

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