Energy Dissipation and Fracture Mechanism of Layered Sandstones under Coupled Hydro-Mechanical Unloading

Song, Zhichao; Zhang, Junwen; Wu, Shaokang

doi:10.3390/pr11072041

Cited by 4 publications

(2 citation statements)

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“…Furthermore, KNN's prediction accuracy heavily depends on the chosen value of k' (the number of nearest neighbors), which might not always be optimal for the dataset, leading to reduced accuracy in certain scenarios. The performance indicators were calculated using Equations ( 32)- (35). RF and XGBoost exhibited notably higher accuracy compared to KNN due to several factors.…”

Section: Performance Of Modelsmentioning

confidence: 99%

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Predicting Sandstone Brittleness under Varying Water Conditions Using Infrared Radiation and Computational Techniques

Khan,

Ma,

Emad

et al. 2023

Water

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The brittleness index is one of the most integral parameters used in assessing rock bursts and catastrophic rock failures resulting from deep underground mining activities. Accurately predicting this parameter is crucial for effectively monitoring rock bursts, which can cause damage to miners and lead to the catastrophic failure of engineering structures. Therefore, developing a new brittleness index capable of effectively predicting rock bursts is essential for the safe and efficient execution of engineering projects. In this research study, a novel mathematical rock brittleness index is developed, utilizing factors such as crack initiation, crack damage, and peak stress for sandstones with varying water contents. Additionally, the brittleness index is compared with previous important brittleness indices (e.g., B1, B2, B3, and B4) predicted using infrared radiation (IR) characteristics, specifically the variance of infrared radiation temperature (VIRT), along with various artificial intelligent (AI) techniques such as k-nearest neighbor (KNN), extreme gradient boost (XGBoost), and random forest (RF), providing comprehensive insights for predicting rock bursts. The experimental and AI results revealed that: (1) crack initiation, elastic modulus, crack damage, and peak stress decrease with an increase in water content; (2) the brittleness indices such as B1, B3, and B4 show a positive linear exponential correlation, having a coefficient of determination of R2 = 0.88, while B2 shows a negative linear exponential correlation (R2 = 0.82) with water content. Furthermore, the proposed brittleness index shows a good linear correlation with B1, B3, and B4, with an R2 > 0.85, while it shows a poor negative linear correlation with B2, with an R2 = 0.61; (3) the RF model, developed for predicting the brittleness index, demonstrates superior performance when compared to other models, as indicated by the following performance parameters: R2 = 0.999, root mean square error (RMSE) = 0.383, mean square error (MSE) = 0.007, and mean absolute error (MAE) = 0.002. Consequently, RF stands as being recommended for accurate rock brittleness prediction. These research findings offer valuable insights and guidelines for effectively developing a brittleness index to assess the rock burst risks associated with rock engineering projects under water conditions.

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Section: Performance Of Modelsmentioning

confidence: 99%

“…The mechanical behavior of rocks is very different in dry conditions compared to wet conditions [35]. Deep hard-rock tunnels tend to be less prone to rock bursts when the surrounding rock contains moisture.…”

Section: Introductionmentioning

confidence: 99%