Study on the damage-softening constitutive model of rock and experimental verification

Yang, Sheng‐Qi; Hu, Bo; Xu, Peng

doi:10.1007/s10409-018-00833-y

Cited by 21 publications

(5 citation statements)

References 36 publications

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“…A further increase in load surpassing the elastic limit leads to the determination of uniaxial compressive strength, which is also known as the unconfined compressive strength (UCS) of a material because the confining stress is set to zero. Once the UCS is surpassed, a large crack has developed, leading to a subsequent fracture of the sample, accompanied (as reported in [29]) by a brittle stress drop and a strain softening (Zone 3).…”

Section: Determination Of the Linear Elastic Zonementioning

confidence: 86%

Nonlinear Young’s Modulus of New Red Sandstone: Experimental Studies

Riabokon

Поплыгин

Турбаков

et al. 2021

Acta Mech. Solida Sin.

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Young’s modulus of New Red Sandstone was investigated experimentally to gain insight into its nonlinear nature. A large experimental programme was carried out by applying a controllable quasi-static and dynamic uniaxial loading to 286 dry sandstone samples of four different sizes. The static and dynamic tests, similar to those aiming at determining the uniaxial compressive strength, were conducted using the state-of-the-art experimental facilities at the University of Aberdeen including a custom-built small experimental rig for inducing a dynamic uniaxial compressive load via a piezoelectric transducer. The obtained results have confirmed a complex nature of Young’s modulus of sandstone. Specifically, under a harmonic dynamic loading, it shows strongly nonlinear behaviour, which is hardening and softening with respect to frequency and amplitude of the dynamic loading, respectively.

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Section: Determination Of the Linear Elastic Zonementioning

confidence: 86%

Nonlinear Young’s Modulus of New Red Sandstone: Experimental Studies

Riabokon

Поплыгин

Турбаков

et al. 2021

Acta Mech. Solida Sin.

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“…The above equations are combined with the damage evolution equation Equation (19), which can be expressed by a matrix as follows:…”

Section: Solution Of Damage Evolutionmentioning

confidence: 99%

“…Unteregger et al [16] proposed a damage-plastic coupling model based on continuum theory to describe the damage process of intact rock and established a constitutive model suitable for complex three-dimensional stress states. Yang et al [17][18][19][20] introduced the concept of the yield stress ratio and proposed a damage softening model that combined the M-C yield criterion to describe the whole stressstrain curve. Based on continuous damage mechanics, Poulet et al [21] established the damage model of a coupled thermal field, fluid field, and stress field and implemented it with numerical software.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the exploration of rock constitutive models and damage mechanisms from the perspective of energy has been greatly developed, and researchers have done much work [19,20,[35][36][37][38][39][40]. Xie et al [41,42] explored the energy mechanism in the process of rock deformation and discussed the relationship between energy release and rock failure.…”

Section: Introductionmentioning

confidence: 99%

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Study on Damage Evolution Model of Sandstone under Triaxial Loading and Postpeak Unloading Considering Nonlinear Behaviors

et al. 2021

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Conventional triaxial loading and unloading tests were carried out on sandstone samples in the Zigong area, of Sichuan Province, China. The changes in the elastic modulus of the unloading curves under different confining pressures were calculated, and the evolution law of the nonlinear properties of rock was analyzed. The results show that the rock is subjected to nonlinear damage during initial compaction, the elastic phase, destruction, and postpeak unloading. Moreover, the nonlinear behaviors of rock are restrained by the confining pressures. On this basis, a nonlinear stress-strain relationship affected by the average stress is proposed to describe nonlinear behaviors in the initial compaction stage. According to the test data, the evolution laws of various energies inside the rock during loading and unloading cycles are obtained. The results show that the external work is transformed into elastic energy and damage dissipated energy. Based on the energy analysis, the energy balance equation is established according to the law of energy conservation. By deriving the energy balance equation, the damage evolution equation of sandstone under triaxial loading is solved to establish a continuous constitutive model. The calculation results of the model are compared with the test results from two aspects of loading and postpeak unloading. The comparison results show that the proposed model, which reflects the whole stress-strain process and nonlinear properties of rock, could also describe the stress-strain relationship at the postpeak unloading stage to some extent.

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“…The deformation and failure process after loading shows obvious nonlinear characteristics. The generalized Hoek-Brown strength criterion can reflect the nonlinear failure characteristics of rock mass better by comprehensively considering a variety of influencing factors, while D-P criterion is relatively conservative, and M-C criterion is more suitable to represent the linear relation [23][24][25][26][27]. Therefore, the generalized Hoek-Brown strength criterion was selected as the failure criterion of HCCB.…”

Section: Introductionmentioning

confidence: 99%

Study on Damage Constitutive Model of High-Concentration Cemented Backfill in Coal Mine

Yang

2021

Geofluids

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In order to construct the damage constitutive model (DCM) of high-concentration cemented backfill (HCCB) in coal mine, the generalized Hoek-Brown strength criterion was used as the failure criterion. For the difference of theoretical derivation of constitutive relation, a new DCM based on residual strength was proposed. Combined with the conventional triaxial compression test, the correctness and rationality of the DCM were verified. The damage evolution characteristics of HCCB were analyzed, and the physical meaning of model parameters was clarified. The results show that (a) the theoretical curves of stress-strain relation are in good agreement with its experimental curves, which means DCM can simulate the deformation and failure process of HCCB. (b) The damage evolution curve of HCCB is S -shaped. To some extent, the confining pressure can inhibit the development of damage. (c) The parameter F 0 reflects the position of the peak point of the DCM, and parameter n is the slope of the straight line segment in the postpeak strain softening stage, which are, respectively, used to characterize the strength level and brittleness of HCCB. The establishment of DCM of HCCB is helpful to reveal its deformation and failure mechanism and provides theoretical basis for its strength design.

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Study on the damage-softening constitutive model of rock and experimental verification

Cited by 21 publications

References 36 publications

Nonlinear Young’s Modulus of New Red Sandstone: Experimental Studies

Nonlinear Young’s Modulus of New Red Sandstone: Experimental Studies

Study on Damage Evolution Model of Sandstone under Triaxial Loading and Postpeak Unloading Considering Nonlinear Behaviors

Study on Damage Constitutive Model of High-Concentration Cemented Backfill in Coal Mine

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