Energy Damage Evolution Mechanism of Rock and Its Application to Brittleness Evaluation

Chen, Ziquan; He, Chuan; Ma, Gaoyu; Xu, Guowen; Ma, Chunchi

doi:10.1007/s00603-018-1681-0

Cited by 89 publications

(21 citation statements)

References 16 publications

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“…With an Figure 14 shows the relationship between modulus and brittleness of glutenite specimens under triaxial compression. Glutenite brittleness and E exhibit a negative exponential relationship, which is different from the negative linear relationship between brittleness and E of coal [23] and sandstone [43]. In contrast, glutenite brittleness and -M exhibit a positive exponential relationship.…”

Section: Correlations Between Mechanical Parameters and The Brittleness Of Glutenitementioning

confidence: 58%

“…Therefore, the rate of strain energy dissipation and energy release is thought to be closely related to rock brittleness. Chen et al [43] indicated that the development of dissipated energy could reflect the extent of the damage and fracture evolution processes in rock. Therefore, the energy-based damage variable e D is proposed to evaluate the extent of damage during the entire process of rock failure and can be expressed as follows: Figure 5 illustrates the damage evolution over the entire process of rock failure, which can be divided into three stages.…”

Section: Energy Damage Evolution Mechanism Of the Entire Process Of Glutenite Failurementioning

confidence: 99%

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Brittleness Evaluation of Glutenite Based On Energy Balance and Damage Evolution

Zhai

Zhang

et al. 2019

Energies

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Tight glutenite reservoirs are typically characterized by highly variable lithology and permeability, low and complex porosity, and strong heterogeneity. Glutenite brittleness is an essential indicator for screening fracture targets, selecting technological parameters, and predicting the hydraulic fracturing effect of tight glutenite reservoir exploitation. Glutenite formations with high brittleness are more likely to be effectively fractured and form complex fractures. Accurate evaluation of glutenite brittleness facilitates the recovery of oil and gas in a tight glutenite reservoir. Accordingly, two brittleness indexes are proposed in this paper based on energy balance and damage evolution analysis of complete stress–strain curves to evaluate the brittleness of glutenite. Uniaxial and triaxial compression tests of glutenite specimens were carried out and the brittleness indexes were verified by comparison with other existing indexes. The relationships between the mechanical properties and brittleness of glutenite under confining pressure were analyzed based on experimental results and the effects of mechanical and structural parameters on glutenite brittleness are investigated with a numerical approach. The brittleness of glutenite increases with the increase of gravel size and/or volume content. During hydraulic fracturing design, attention should be paid to the brittleness of the matrix and the size and content of gravel. This paper provides a new perspective for glutenite brittleness evaluation from the perspectives of energy dissipation and damage evolution. Our results provide guidance for fracturing layer selection and may also facilitate field operations of tight glutenite fracturing.

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Section: Correlations Between Mechanical Parameters and The Brittleness Of Glutenitementioning

confidence: 58%

Section: Energy Damage Evolution Mechanism Of the Entire Process Of Glutenite Failurementioning

confidence: 99%

Brittleness Evaluation of Glutenite Based On Energy Balance and Damage Evolution

Zhai

Zhang

et al. 2019

Energies

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“…Rocks can reflect the degree of damage to it during loading, and Chen et al [25] proposed the energy dissipative rock damage variable D:…”

Section: Damage Analysismentioning

confidence: 99%

Energy Analysis Method for Uniaxial Compression Test of Sandstone under Static and Quasi‐Dynamic Loading Rates

Liu

Zhao

Meng

et al. 2021

Advances in Materials Science and Engineering

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To investigate the energy evolution characteristics of sandstone under static-quasi-dynamic loading rates (1.0 × 10−3, 5.0 × 10−3, 1.0 × 10−2, 5.0 × 10−2, and 1.0 × 10−1 mm/s), the uniaxial compression tests, the uniaxial cyclic loading-unloading tests, and the uniaxial incrementally cyclic loading-unloading tests were conducted under five different loading rates. Through analysis of the elastic energy of the uniaxial cyclic loading-unloading test and the uniaxial incremental cyclic loading-unloading test, show that the impact of the loading rate and the cycle numbers on the elastic energy is less. Hence, we can deem that when the loads of the uniaxial incremental cyclic loading-unloading test and the uniaxial compression test are equal, the elastic energy of the two also equals. The energy in the uniaxial compression tests analyzed by the uniaxial incrementally cyclic loading-unloading test show that elastic energy increased linearly when the input energy increased under different loading rates. Through the linear energy storage law and the uniaxial incremental cyclic loading and unloading test, it is possible to analyze the energy in the uniaxial compression test at any loading rates. The results show that the greater the loading rate, the greater the peak elastic energy and peak input energy. But when the load is equal, the greater the loading rate, the smaller the input energy and elastic energy. Compared with traditional methods, the new energy analysis method is accurate and simple. Meanwhile, based on energy dissipation, the damage of rock during uniaxial compression tests was studied.

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“…Many scholars have analysed the damage and destruction processes of rocks from an energy perspective [4][5][6]. Chen et al [7,8] studied the fracture evolution and energy damage evolution mechanism of deeply buried carbonaceous slate.…”

Section: Introductionmentioning

confidence: 99%

Study on the Meso‐Energy Damage Evolution Mechanism of Single‐Joint Sandstone under Uniaxial and Biaxial Compression

Wang

Cao

Sun

et al. 2021

Advances in Materials Science and Engineering

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Energy conversion and release occur through the entire deformation and failure process in jointed rock masses, and the accumulation and dissipation of rock mass energy in engineering can reveal the entire process of deformation and instability. This study uses PFC2D to carry out numerical simulation tests on single-joint sandstone under uniaxial compression and biaxial compression, respectively, and analyse the influence of joint inclination, length, and confining pressure on the meso-energy conversion process and phase evolution of jointed sandstone. Through analysis, it is found that the input meso total strain energy is transformed into meso dissipated energy and meso-elastic strain energy. Macroscopic and microscopic joint sandstone law is consistent with the overall energy evolution; and the difference is reflected in two aspects: (1) the microlevel energy evolution has no initial compaction energy consumption section and (2) the linear energy storage section before the macroenergy evolution peak can be subdivided into two sections in the meso-level energy evolution. Under uniaxial compression, the energy values at the characteristic points of the meso-level energy evolution phases first asymmetrically decrease and then increase with the increase of the joint inclination. The initiation point of jointed sandstone is significantly affected by the length of the joint, and the degradation effect of the meso-energy at the damage point and peak point weakens with the increase of the joint length. Comparing the data obtained from the PFC numerical simulation with the experimental data, it is found that the error is small, which shows the feasibility of the numerical model in this paper. Under biaxial compression, the accumulation rate of meso-elastic strain at the peak point of the jointed sandstone first decreases and then increases with the joint inclination angle. After the peak of jointed sandstone, the rate of sudden change of meso-energy change decreases with the increase of joint length. The conditions of high confining pressure will promote the meso-accumulated damage degree of the jointed sandstone before the peak, while inhibiting the meso-energy and the mutation degree of the damage after the peak. The higher the confining pressure, the more obvious the joint length and inclination effect characteristics of the elastic strain energy at the peak point of the jointed sandstone.

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Energy Damage Evolution Mechanism of Rock and Its Application to Brittleness Evaluation

Cited by 89 publications

References 16 publications

Brittleness Evaluation of Glutenite Based On Energy Balance and Damage Evolution

Brittleness Evaluation of Glutenite Based On Energy Balance and Damage Evolution

Energy Analysis Method for Uniaxial Compression Test of Sandstone under Static and Quasi‐Dynamic Loading Rates

Study on the Meso‐Energy Damage Evolution Mechanism of Single‐Joint Sandstone under Uniaxial and Biaxial Compression

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