Energy Evolution of Rock under Different Stress Paths and Establishment of A Statistical Damage Model

Liu, Wenbo; Shu-guang, Zhang; Sun, Boyi

doi:10.1007/s12205-019-0590-4

Cited by 25 publications

(12 citation statements)

References 28 publications

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“…In order to clarify the energy conversion mechanism of rock burst. Xie et al [11] studied the law of energy accumulation and release based on elastic theory; Liu et al [12] analyzed the energy evolution law by the elastic energy of each unloading point during the uniaxial graded loading and unloading process. Zhang et al [13] and Liu et al [14] used PFC numerical simulation to study the energy evolution law from microcrack propagation and acoustic emission characteristics.…”

Section: Introductionmentioning

confidence: 99%

PFC Simulation Study on Time-dependent Deformation Failure Properties and Energy Conversion Law of Sandstone under Different Axial Stress

Wang

Liu²

2022

Period. Polytech. Civil Eng.

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Rock burst mostly happens in deep rock engineering, which obviously performs obvious time-dependent destruction and releases huge energy. Thus, the uniaxial compressive time-dependent deformation failure tests of sandstone under different axial stress are conducted and the optimized Parallel-bonded stress corrosion (PSC) model is established based on PFC method. The results show that tension micro-cracks are the direct reason of rock bearing capacity reduction during the whole failure process. The time-dependent deformation stage is composed of the initial strain stage, the steady-state strain stage and the accelerated strain stage. As the axial stress increases, rock mass enters into the accelerated strain stage more quickly and the strain amount of time-dependent deformation stage decreases. From the comparison of energy conversion between PFC simulation and experiments, the higher elastic strain energy will be accumulated and the less dissipation energy will be produced while the axial stress increases when reaching the failure point. After the failure point, the elastic strain energy has a small increase because the strain rate changes faster than the failure relaxation rate. Based on the calculation results of residual elastic energy index (AEF), the rock burst shows a tendency that from weakness to moderation as the axial stress increases. The research results will provide a certain reference in predicting the rock burst.

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Section: Introductionmentioning

confidence: 99%

PFC Simulation Study on Time-dependent Deformation Failure Properties and Energy Conversion Law of Sandstone under Different Axial Stress

Wang

Liu²

2022

Period. Polytech. Civil Eng.

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“…Numerous studies at home and abroad have shown that the destruction of rocks is due to energy damage, and energy dissipation and release fracture have been widely studied in the scientific community [18][19][20][21]. Zhao et al [22] used RFPA 2D to study the damage behavior of rock specimens, including damage processes, damage modes, damage mechanisms, and shear strength.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Fracture and Energy Evolution Characterization of Naturally Fractured Granite Subjected to Multilevel Cyclic Loads

Guo

Wang

2021

Geofluids

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Naturally fractured rock mass is susceptible to stress disturbance and could result in the stimulation of natural fractures and even serious geological hazards. In this work, multilevel uniaxial fatigue loading experiments were carried out to reveal the fracture and energy evolution of naturally fractured granite using stress-strain descriptions and energy evolution analysis. Results reveal the influence of natural fracture on mechanical properties of granite, regarding the fatigue lifetime, fatigue deformation characteristics, fatigue damage, energy evolution, and fatigue failure pattern. Volumetric and shear processes caused by the sliding and shearing along the natural fracture control the whole failure process. The energy dissipation and release characteristics are strongly impacted by natural fractures. The elastic energy and dissipated energy both decrease with increasing natural fracture volume, growth of the dissipated energy becomes faster for rock near to failure. It is proved that the dissipated energy is mainly used to activate the preexisting natural fractures.

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“…According to the randomness of the distribution of defects in rock materials, the damage in rock deformation and failure process was studied based on the maximum strain criterion and a DCM with simple form and parameter easy to obtain was established [6][7][8][9]. Using the Mohr-Coulomb (M-C) criterion as the expression method of microelement strength and assuming the microelement strength follows Weibull random distribution, a three-dimensional damage statistical constitutive model was established to reflect the postpeak softening characteristics of rock [10][11][12][13][14]. Based on the theory of probability statistics and continuous damage mechanics, the Drucker-Prager (D-P) criterion was introduced as the failure criterion of rock microelements, and the damage evolution equation of rock was deduced strictly, which greatly improved the degree of agreement between the theoretical curve of σ 1 − ε 1 relation and the test data [15][16][17][18][19].…”

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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Energy Evolution of Rock under Different Stress Paths and Establishment of A Statistical Damage Model

Cited by 25 publications

References 28 publications

PFC Simulation Study on Time-dependent Deformation Failure Properties and Energy Conversion Law of Sandstone under Different Axial Stress

PFC Simulation Study on Time-dependent Deformation Failure Properties and Energy Conversion Law of Sandstone under Different Axial Stress

Dynamic Fracture and Energy Evolution Characterization of Naturally Fractured Granite Subjected to Multilevel Cyclic Loads

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

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