Influences of the number of non-consecutive joints on the dynamic mechanical properties and failure characteristics of a rock-like material

Li, Xiaoshuai; Gao, Wen; Guo, Lianjun; Li, Zhuo; Zhang, Shenghui

doi:10.1016/j.engfailanal.2023.107101

Cited by 18 publications

(3 citation statements)

References 42 publications

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Section: Test Methodsmentioning

confidence: 99%

“…The bar size is marked in the diagram. Notably, to maintain the end face of the specimen flush with all the bars in the test, lubricant was smeared on both sides of the specimen in advance; thus, the experimental error was reduced [23]. In the preceding formula, m c denotes the filling body quality under different water contents, m f denotes the saturated quality of the specimen, m d denotes the drying quality of the specimen, s denotes the moisture content grade, and ω denotes the water content of the saturated sample.…”

Section: Experimental Devicesmentioning

confidence: 99%

“…The bar size is marked in the diagram. Notably, to maintain the end face of the specimen flush with all the bars in the test, lubricant was smeared on both sides of the specimen in advance; thus, the experimental error was reduced [23]. According to the basic stress wave theory, the voltage signal obtained using the test monitoring can be processed into a strain value, and the transformation relationship of the stress, strain, and strain rates with time in the specimen satisfies Formulas (3)-(5) [10].…”

Section: Experimental Devicesmentioning

confidence: 99%

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Analyzing the Energy and Damage Constitutive of Cemented Backfill with Different Water Content under Dynamic Load

Hu,

Li,

et al. 2023

Materials

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The dynamic characteristics of the filling body are the key parameters for designing the filling ratio and evaluating the stability of an underground stope. The different environment (water-bearing state) of the filling body in the underground stope exerts a complex impact on the mechanical behavior of the filling body. Therefore, six groups of cemented filling body specimens with different states were formed and subjected to dynamic uniaxial impact tests. The effects of water content on the mechanical properties, fractal dimension, and deformation damage characteristics of the cemented backfill under dynamic load were analyzed in depth, and a dynamic damage constitutive model that considers water damage and the compaction stage was established. The results indicate the following: (1) Due to the change of the specimen from the dry state to the water saturation state, the dynamic compressive strength of the cemented filling body decreases from 5.03 Mpa to 1.79 Mpa; however, the ductility of the specimen generally increases, and the filling body specimens with different water contents mainly exhibit tensile failure. (2) There is a significant nonlinear relationship between the water content and the fractal dimension Db of the cemented backfill specimen, and the growth rate of the fractal dimension Db tends to slow down with the increase in the water content. (3) From the energy evolution perspective, the water content of the specimen exerts a significant effect on the elastic deformation and failure stage of the stress–strain curve, and the slope of the dissipated energy-strain curve decreases with the increase in water content. (4) Based on the Weibull distribution and damage theory, a statistical damage constitutive model of cemented backfill was established, and it was compared with the experimental curve to verify the rationality of the model. Therefore, the relationship between stress and damage and the strain curves is discussed, and it is inferred that the damage evolution curve of cemented backfill is a typical S-shaped curve that exhibits a stable development-rapid increase-tending to be gentle. This study can provide a theoretical reference for further understanding the dynamic behavior and stability of backfill under different water conditions.

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Section: Test Methodsmentioning

confidence: 99%

Section: Experimental Devicesmentioning

confidence: 99%

“…The bar size is marked in the diagram. Notably, to maintain the end face of the specimen flush with all the bars in the test, lubricant was smeared on both sides of the specimen in advance; thus, the experimental error was reduced [23]. According to the basic stress wave theory, the voltage signal obtained using the test monitoring can be processed into a strain value, and the transformation relationship of the stress, strain, and strain rates with time in the specimen satisfies Formulas (3)-(5) [10].…”

Section: Experimental Devicesmentioning

confidence: 99%

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