Fracturing evolution analysis of Beishan granite under true triaxial compression based on acoustic emission and strain energy

Yan, Zhang; Feng, Xia‐Ting; Yang, Chengxiang; Zhang, Xiwei; Sharifzadeh, Mostafa; Wang, Zhaofeng

doi:10.1016/j.ijrmms.2019.03.029

Cited by 93 publications

(15 citation statements)

References 27 publications

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“…This indicates that the rock weaks with water content, which increases the internal damage and ultimately reduces the dissipation strain energy rate. In other words, the higher the strength more will be the dissipation strain energy rate and vice versa [72][73][74][75][76][77][78][79].…”

Section: Strain Energy Ratementioning

confidence: 99%

Prediction of Sandstone Dilatancy Point in Different Water Contents Using Infrared Radiation Characteristic: Experimental and Machine Learning Approaches

Khan

Cao

et al. 2022

Lithosphere

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In rock mechanics, the dilatancy point is always occurring before rock failure during loading process. Water content plays a significant role in the rock physiomechanical properties, which also impact the rock dilatancy point under loading process. This dilatancy point significantly plays a warning role in the rock engineering structures stability. Therefore, it is essential to predict the rock dilatancy point under different water contents to get an early warning for effective monitoring of engineering projects. This study investigates the water contents effects on sandstone dilatancy point under loading in the presence of infrared radiation (IR). Furthermore, this IR was used for the first time as an input parameter for different artificial intelligence (AI) techniques to predict the dilatancy point in the stress-strain curve. The experimental findings show that the stress range in stress-strain curve stages (crack closure and unstable crack propagation) increases with water content. However, this range for deformation and stable crack propagation stages decreases with water content. The dilatancy stress, crack initiation stress, and elastic modulus are negatively linearly correlated, while peak stress and stress level are negatively quadraticaly correlated with a high (R2). The absolute strain energy rate, which gives a sudden increase at the point of dilatancy, is used as the dilatancy point index. The stress level is 0.86 σmax at the dilatancy point for dry rock and decreases with water content. This index is predicted from IR data using three computing techniques: artificial neural network (ANN), random forest regression (RFR), and k-nearest neighbor (KNN). The performance of all techniques was evaluated using R2 and root-means-square error (RMSE). The results of the predicted models show satisfactory performances for all, but KNN is remarkable. The research findings will be helpful and provide guidelines about underground engineering project stability evaluation in water environments.

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Section: Strain Energy Ratementioning

confidence: 99%

Prediction of Sandstone Dilatancy Point in Different Water Contents Using Infrared Radiation Characteristic: Experimental and Machine Learning Approaches

Khan

Cao

et al. 2022

Lithosphere

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“…To simulate the stress path of rock mass failure in deep underground engineering, the typical stress path (Zhang et al, 2019) finally adopted in this study is shown as follows: (a) Hydrostatic loading stage: loading simultaneously in three principal stress directions (σ 1 = σ 2 = σ 3 ) at a loading rate of 0.5 MPa/s to the minimum principal stress level. (b) Intermediate principal stress loading stage: keeping σ 3 unchanged and loading σ 1 and σ 2 simultaneously (σ 1 = σ 2 ) at a loading rate of 0.5 MPa/s to set the σ 2 level.…”

Section: Failure Analysis Of Granite Sample Based On True Triaxial Testmentioning

confidence: 99%

Study on Failure Difference of Hard Rock Based on a Comparison Between the Conventional Triaxial Test and True Triaxial Test

Zheng¹,

Tang²,

Zhang

et al. 2022

Front. Earth Sci.

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The study on the failure difference of deep hard rock based on the comparison between conventional and true triaxial tests can help us better understand the fracture processes and failure characteristics of the deep rock mass. Therefore, this article carries out a comparative analysis of the failure of hard rock under conventional and true triaxial stress states. Within the scope of this study, it is found that the brittle–ductile transformation properties can be intuitively reflected in the rock stress–strain curve and failure mode. The brittle–ductile transition point of rock can also be determined by the difference between peak and residual strengths. The rock failure strength increases with the increase of σ2, the peak strain decreases with the increase of σ2, the stress drop of the post-peak curve becomes more obvious with the increase of σ2, and the rock tends toward Class II brittle failure after the peak with the increase of σ2. When σ3 is relatively high, the rock fracture angle increases with the increase of σ2 with obvious regularity. Compared with conventional triaxial stress conditions, the differential stress-induced anisotropy failure is the biggest difference in rock fracture characteristics between true and conventional triaxial stress states. This study can supply useful references to the study of failure properties of hard rock under complex stress states.

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“…Early uniaxial rock mechanics test (Zhao and Jiang, 2010) have evolved into a true triaxial excavation simulation, including the installation of various monitoring instruments to observe the rockburst process (He et al, 2012), analyze the shape and kinetic energy of rockburst blocks (Su et al, 2017a;Su et al, 2017b), and study the acoustic emission spectrum characteristics, energy release , and rockburst tendency (Gong et al, 2020). (Zhang et al, 2019a;2019b;2019c;Zhang et al, 2021) proposed a strain energy determination method for rocks under true triaxial compression (TTC), and investigated the energy evolution process and mechanism of different hard rocks under true triaxial compression (TTC) using strain energy analysis (Qu et al, 2022). In order to accurately and effectively predict the occurrence of rock bursts, a multi-indicator evaluation method for the occurrence of rock bursts at deep subsurface rock openings was established (Xu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Characterization of true triaxial rock bursts in sandstones with different water contents

Chen¹,

Zhou²,

Pan³

et al. 2023

Front. Earth Sci.

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The rockburst phenomenon occurs in dry red sandstone under high in situ stress, and the rockburst effect is weaker for a water-bearing rock. The rockburst effect on red sandstone with different water contents is analyzed in this paper. A true triaxial testing machine is used to conduct the loading, and acoustic emission recording equipment and a high-speed camera are used to monitor the acoustic signal inside the rock and the rock-caving situation throughout the entire process in order to analyze the characteristics of the acoustic emissions and the ejection form of the rockburst. The results show that rockburst occurs in dry red sandstone and 50% saturated red sandstone but not in saturated red sandstone. The phrase characteristics of the stress–strain curve of the dry rock vary more significantly than those of the water-bearing rock, and the elastic strain energy inside the rock decreases gradually as the water content increases. The double peak of the acoustic emissions curve occurs during the failure process of the dry rock and gradually transitions to a stepped pattern as the water content increases. The ejected fragments of dry red sandstone during the rockburst are abundant and large. The true triaxial test results illustrate the characteristic effect of the rockburst on red sandstone with different water contents, reveal the failure mode and ejection characteristics of red sandstone with different water contents, and demonstrate the influence of the water content on the rockburst characteristics of red sandstone. The results of this study provide a theoretical reference for the study of the rockburst mechanisms of similar hard rocks.

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Fracturing evolution analysis of Beishan granite under true triaxial compression based on acoustic emission and strain energy

Cited by 93 publications

References 27 publications

Prediction of Sandstone Dilatancy Point in Different Water Contents Using Infrared Radiation Characteristic: Experimental and Machine Learning Approaches

Prediction of Sandstone Dilatancy Point in Different Water Contents Using Infrared Radiation Characteristic: Experimental and Machine Learning Approaches

Study on Failure Difference of Hard Rock Based on a Comparison Between the Conventional Triaxial Test and True Triaxial Test

Characterization of true triaxial rock bursts in sandstones with different water contents

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