An elasto-plastic damage constitutive model with double yield surfaces for saturated soft rock

Zhou, Cuiying; Zhu, Fengxian

doi:10.1016/j.ijrmms.2010.01.002

Cited by 55 publications

(15 citation statements)

References 33 publications

(44 reference statements)

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“…Both the scalar and tensorial cases were researched. Zhou and Zhu [81] derived an elasto-plastic damage formulation model with double yield surfaces based on permanent thermodynamics speculation and damage mechanics approach. Feng and Yu [82] described the methods for characterising progressive damage of micro-cracks and introduced the concept of direction field of micro-crack expansion.…”

Section: Review Of the Developed Damage Models In Brittle Materialsmentioning

confidence: 99%

A Novel Damage Model for Strata Layers and Coal Mass

et al. 2020

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Coal burst occurrences are affected by a range of mining and geological factors. Excessive slipping between the strata layers may release a considerable amount of strain energy, which can be destructive. A competent strata is also more vulnerable to riveting a large amount of strain energy. If the stored energy in the rigid roof reaches a certain level, it will be released suddenly which can create a serious dynamic reaction leading to coal burst incidents. In this paper, a new damage model based on the modified thermomechanical continuum constitutive model in coal mass and the contact layers between the rock and coal mass is proposed. The original continuum constitutive model was initially developed for the cemented granular materials. The application of the modified continuum constitutive model is the key aspect to understand the momentum energy between the coal–rock interactions. The transformed energy between the coal mass and different strata layers will be analytically demonstrated as a function of the rock/joint quality interaction conditions. The failure and post failure in the coal mass and coal–rock joint interaction will be classified by the coal mass crushing, coal–rock interaction damage and fragment reorganisation. The outcomes of this paper will help to forecast the possibility of the coal burst occurrence based on the interaction between the coal mass and the strata layers in a coal mine.

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Section: Review Of the Developed Damage Models In Brittle Materialsmentioning

confidence: 99%

A Novel Damage Model for Strata Layers and Coal Mass

et al. 2020

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“…where κ ′ is the hardening parameter, which is influenced by the hydration effect. The Drucker-Pracker yield criterion has been widely used in the problem of wellbore stability in shale formations to describe the elastoplastic behavior of shale [24][25][26][27][28]. In this study, the elastoplastic calculation is performed using the Drucker-Prager criterion.…”

Section: Elastoplastic Constitutive Relationmentioning

confidence: 99%

Modelling of Time-Dependent Wellbore Collapse in Hard Brittle Shale Formation under Underbalanced Drilling Condition

Jia

Xiao

et al. 2019

Geofluids

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In recent years, the lithologic traps in a mid-depth formation are the focus of oil or gas exploration and development for eastern oilfields in China. The Shahejie Formation develops thick hard brittle shale, and the wellbore instability problem is prominent due to obvious hydration effect for long immersion time during drilling. Through the analysis of laboratory tests and field test results of physical and chemical properties and microstructure and mechanical properties of hard brittle shale, the instability mechanism is discussed for the wellbore in the shale formation. To simulate the whole process of progressive collapse of a wellbore in a hard brittle shale formation, a coupled hydraulic-mechanical-chemical (HMC) model is developed and this model is compiled with ABAQUS software as the solver. Then the coupled HMC model is applied to simulate the progressive evolution process of wellbore collapse in a hard brittle shale formation, and the influence of different parameters on the progressive failure of the wellbore is analysed. The results show that the wellbore enlargement rate increases with the drilling fluid immersion time and the influence of different parameters on the wellbore enlargement rate is different. The water absorption diffusion coefficient and the activity of the drilling fluid have the most obvious influence on the expansion of the wellbore, and the sensitivity is strong. The permeability of shale has little effect on the wellbore enlargement rate. The calculated progressive failure process of the wellbore is basically consistent with that of the actual drilling.

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“…Li et al [21] proposed that the instability mechanism of soft rock roadways caused by a high content of confined water consists of fracturing, seepage, silting and closing processes based on two experimental cycles of the surrounding rock; these processes decrease rock strength and lead to roadway instability. However, at present, experimental studies on soft rock softening control under seawater conditions are still limited to the damage characteristics and stability analysis stage of coastal rock bank slopes [30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Study on the Softening Mechanism and Control of Red-Bed Soft Rock under Seawater Conditions

Liu

Fan

et al. 2019

JMSE

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Red-bed soft rock easily softens and disintegrates when it comes into contact with water, which is the main factor restricting the application of soft rock as an engineering filler. Therefore, research on the influence of seawater on soft rock softening has great significance for the application of soft rock in marine engineering. To examine the softening mechanism of soft rock under seawater conditions, two kinds of soft rock softening experiments, as well as ion inhibition tests of soft rock softening, were performed under seawater and pure water conditions, and the results were compared. The variation in the soft rock composition, the deformation and failure characteristics of soft rock under the influence of sea water, and the variation in main cations in the softening process of soft rock are examined successively; the influences of different ions on soft rock softening are further analysed. Based on the analyses, the softening mechanism and control method of soft rock under sea water conditions are expounded. The study showed that soft rock softening was inhibited by seawater, which decreased the softening degree of soft rock. The main cations in seawater had an inhibitory effect on soft rock softening, and the order of inhibition was Ca2+ > Mg2+ > Na+. According to the inhibitory effect of ions on soft rock softening, we propose that seawater or calcium salt should be added to reduce the softening of soft rock in soft rock engineering and improve the mechanical strength of soft rock; in addition, soft rock can be considered a raw material in marine engineering. The experimental results have great significance for studies of the disintegration mechanism and inhibitory rules of soft rock under the influence of seawater and provide a theoretical basis for the application of soft rock in marine engineering, such as in artificial reef engineering and coastal dike engineering.

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An elasto-plastic damage constitutive model with double yield surfaces for saturated soft rock

Cited by 55 publications

References 33 publications

A Novel Damage Model for Strata Layers and Coal Mass

A Novel Damage Model for Strata Layers and Coal Mass

Modelling of Time-Dependent Wellbore Collapse in Hard Brittle Shale Formation under Underbalanced Drilling Condition

Study on the Softening Mechanism and Control of Red-Bed Soft Rock under Seawater Conditions

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