Experimental investigation of the creep behaviour of remoulded loess under different levels of compactness

Tang, Hao; Luo, Jinzhi; Duan, Zhao; Wang, Dongpo; Qi, Shengwen

doi:10.1371/journal.pone.0262456

Cited by 6 publications

(9 citation statements)

References 24 publications

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“…According to literature, most of the current studies on multi-stage shear creep models for rock masses are conducted based on the element model. This only considers the time accumulation effect and the microscopic damage of rock masses caused by shear stress [ 43 , 44 ]. Multi-stage shear creep damage models that consider the effects of initial damage such as rock mass shear surface joints and fractures have not been found.…”

Section: Description Of the Damage Modelmentioning

confidence: 99%

“…Based on Lemaitre’s strain equivalence assumptions, the coupling damage expression obtained in [ 47 ] can be written as: …”

Section: Description Of the Damage Modelmentioning

confidence: 99%

“…Based on the formula proposed in this paper to calculate the coupling damage of the rock mass shear surface and the coupling damage expression for the rock mass obtained in [ 47 ], the coupling damage variables calculated are shown in Fig 3 . It is not difficult to conclude that the coupling damage variables obtained in this paper are the smallest.…”

Section: Description Of the Damage Modelmentioning

confidence: 99%

“…When creep damage reaches 0.6, the proportion of the initial damage (0.05) in the coupling damage is only 0.0082, which is consistent with the shear creep damage law for the rock mass. The coupling damage variable in [ 47 ] is significantly larger than the coupling damage variable in this paper. Under the condition of constant initial damage for the rock mass, the rate of change for coupling damage Ḋ c as creep damage increases is always constant.…”

Section: Description Of the Damage Modelmentioning

confidence: 99%

“…The initial damage is not reduced when the creep damage increases. This shows that the coupling damage method proposed in [ 47 ] is not applicable to the expression for shear creep coupling damage (initial damage and creep time damage) in rock masses.…”

Section: Description Of the Damage Modelmentioning

confidence: 99%

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A new shear creep damage model for rock masses after considering initial damage

Wang

et al. 2023

PLoS ONE

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For a long time, one of the important safety problems in open-pit mines is the stability of a large number of high slopes with gently inclined soft interlayer. Rock masses formed after long geological processes generally have some initial damage. Mining works also cause varying degrees of disturbance and damage to rock masses in the mining area during the mining process. This phenomenon means that accurate characterization of the time-dependent creep damage for rock masses under shear load is necessary. The damage variable D is defined based on the spatial and temporal evolution laws of shear modulus and initial level of damage for the rock mass. In addition, a coupling damage equation between the initial damage of the rock mass and shear creep damage is established based on Lemaitre’s strain equivalence assumption. Kachanov’s damage theory is also incorporated to describe the entire process of time-dependent creep damage evolution for rock masses. A creep damage constitutive model that can reasonably reflect the actual mechanical properties of rock masses under multi-stage shear creep loading conditions is established. This takes into account multi-stage shear creep loading conditions, instantaneous creep damage during the shear load phase, staged creep damage and factors influencing the initial damage of rock masses. The reasonableness, reliability and applicability of this model are verified by comparing the results of the multi-stage shear creep test with calculated values from the proposed model. As opposed to the traditional creep damage model, the shear creep model established in this present study takes into account the initial damage of rock masses and can describe the multi-stage shear creep damage characteristics of rock masses more convincingly.

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Section: Description Of the Damage Modelmentioning

confidence: 99%

“…Based on Lemaitre’s strain equivalence assumptions, the coupling damage expression obtained in [ 47 ] can be written as: …”

Section: Description Of the Damage Modelmentioning

confidence: 99%

Section: Description Of the Damage Modelmentioning

confidence: 99%

Section: Description Of the Damage Modelmentioning

confidence: 99%

Section: Description Of the Damage Modelmentioning

confidence: 99%