Deep Fracturing of the Hard Rock Surrounding a Large Underground Cavern Subjected to High Geostress: In Situ Observation and Mechanism Analysis

Feng, Xia‐Ting; Pei, Shufeng; Jiang, Quan; Zhou, Yuanzhong; Li, Shaojun; Yao, Zhibin

doi:10.1007/s00603-017-1220-4

Cited by 89 publications

(25 citation statements)

References 16 publications

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“…However, in the case of considering the redistributed stress after excavation, the maximum stress tends to increase to 50∼60 MPa, and the strength/stress ratio would become 2∼3. Overall, the underground cavern groups are located in a high stressed area [23,26].…”

Section: Sensitivity Analysis Of the Mps Estimated By The H-b Criterimentioning

confidence: 99%

Sensitivity Analysis in the Estimation of Mechanical Parameters of Engineering Rock Mass Based on the Hoek–Brown Criterion

Liu

Duan

et al. 2020

Mathematical Problems in Engineering

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Geological strength index GSI, disturbance factor (D), material constant mi, and uniaxial compressive strength σci of the intact rock are essential input parameters IPs of the Hoek–Brown H−B criterion. Mechanical parameters MPs of the engineering rock mass, including elastic modulus E, cohesion c, and internal friction angle φ estimated by the H–B criterion, and the predicted excavation response of surrounding rock, including the displacement and excavation damage zone EDZ based on the MPs, are of high relevance with the four IPs of the H–B criterion. In this paper, the deep and huge underground cavern excavated in basalt from a hydropower station under construction in the southwest of China is used to analyse the sensitivity of the IPs on the MPs, the displacement, and EDZ of the surrounding rock mass. Firstly, the H–B criterion is applied to estimate the MPs, among which the IPs are obtained from a series of in situ and laboratory tests, including borehole camera observation, wave velocity test, uniaxial and triaxial compression tests, and so on. Secondly, the sensitivity relationships between IPs, MPs, and prediction results of displacement and EDZ are established and described quantitatively by the sensitivity factor (si). Results show that the MPs of the rock mass are more sensitive to GSI and D⋅GSI and σci are high-sensitivity parameters affecting the displacement and EDZ. Finally, the variations in the estimated MPs and associated prediction results concerning excavation response, which are caused by the uncertainties in the determination of the IPs, are further quantified. This study provides a straightforward assessment for the variability of the rock mass parameters estimated by the H–B criterion. It also gives a valuable reference to similar geotechnical engineering for the determination of rock mass parameters in the preliminary design.

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Section: Sensitivity Analysis Of the Mps Estimated By The H-b Criterimentioning

confidence: 99%

Sensitivity Analysis in the Estimation of Mechanical Parameters of Engineering Rock Mass Based on the Hoek–Brown Criterion

Liu

Duan

et al. 2020

Mathematical Problems in Engineering

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“…is program is developed based on the principle of finite element calculation [10][11][12][13], but it is different from the traditional basic idea of finite element. It is mainly used to study the whole process of rock mass material from mesodamage to macroscopic failure.…”

Section: Introduction To Rfpa (Realistic Failure Process Analysis)mentioning

confidence: 99%

Numerical Simulation of Rock Uniaxial Compressive Strength and Deformation Failure Law under Different Size Conditions

Tian

Tang

et al. 2021

Advances in Civil Engineering

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Rock engineering occupies an important position in the 21st century. In the face of rock engineering disasters, we are only looking for the essential problems through experiments on rocks, but rock experiments cannot be realized in large numbers, so the article uses numerical simulation software RFPA (Realistic Failure Process Analysis) 2D Basic to simulate rock under different size conditions numerically. In this paper, a rock model with a diameter of 50 mm is used for simulation research. Meanwhile, five calculation models of height-to-diameter ratios of 1.0, 1.5, 2.0, 2.5, and 3 are used. Through simulation calculation, we find that the rock model failure is more than complicated when the value of the height-to-diameter ratio is exceedingly low (1), but as the height-to-diameter ratio increases, the failure mode will become simpler. The stress-concentrated failure will be in the form of axial failure. When the height-to-diameter ratio increases (1.5–2), other damage cracks appear on the basis of axial cleavage failure. As the height-to-diameter ratio continues to increase (about 2.5), only shear failure occurs. When the height-to-diameter ratio reaches a relatively high level (3), there will be both axial rip and other damage. When the height-to-diameter ratio is oversize, there will be both axial rip failure and end damage.

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“…In deep rock engineering, such as mining engineering, tunnel engineering, and water conservancy and hydropower engineering, rock geological environments and stress states are complex, in which rock collapse, rock burst, spalling, and other disasters are frequent, showing the characteristics of unstable brittle fracture (Li et al 2012;Feng et al 2017). The study of the damage and failure of hard rocks is of particular importance for understanding the failure mechanism of these disasters, and the stress state should also be taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

Damage and Failure of Hard Rocks Under True Triaxial Compression

Kong

Gao

Zhang

2020

Handbook of Damage Mechanics

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To reveal the effect of intermediate principal stress on the damage and failure of hard rocks, the failure evolution of hard rocks under true triaxial compression is reviewed, based on the previous study. From the viewpoint of crack growth under true triaxial compression, different fracture evolution stages of hard rocks, including the elastic stage, stable growth stage, and unstable growth stage, are introduced. Additionally, the effect of the intermediate principal stress on the crack stress thresholds is summarized. It is found that as the intermediate principal stress increases, its effect will first restrict and then promote crack propagation. The energy evolution of the rock cracking process under true triaxial compression is also analyzed. The damage evolution is quantified by damage

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Deep Fracturing of the Hard Rock Surrounding a Large Underground Cavern Subjected to High Geostress: In Situ Observation and Mechanism Analysis

Cited by 89 publications

References 16 publications

Sensitivity Analysis in the Estimation of Mechanical Parameters of Engineering Rock Mass Based on the Hoek–Brown Criterion

Sensitivity Analysis in the Estimation of Mechanical Parameters of Engineering Rock Mass Based on the Hoek–Brown Criterion

Numerical Simulation of Rock Uniaxial Compressive Strength and Deformation Failure Law under Different Size Conditions

Damage and Failure of Hard Rocks Under True Triaxial Compression

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