Influence of Fissure Number on the Mechanical Properties of Layer‐Crack Rock Models under Uniaxial Compression

Tan, Yunliang; Guo, Wei‐yao; Zhao, Tianfeng; Yu, Fenghai; Huang, Bin; Huang, Dongmei

doi:10.1155/2018/7179831

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…Sketch of failure mechanism of layer‐crack structure under compression (A) compatible support, (B) incompatible support, and (C) Postpeak instable failure…”

Section: Discussion Of the Failure Mechanism Of The Layer‐crack Strumentioning

confidence: 99%

“…Regarding laboratory studies, Gu et al Zuo et al and Zhang and Pan researched the formation and failure mechanism of layer‐crack structures according to model test results. Zhou et al and Tan et al researched the mechanical behavior of model specimens that meet the architectural features of layer‐crack structures. Arora and Mishra Du et al and Gong et al reproduced the failure process of layer‐crack structures through biaxial or triaxial laboratory tests.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the failure mechanism of layer‐crack structure

Guo

Tan

et al. 2019

Energy Science & Engineering

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Field investigations have proven that layer‐crack structures make an essential contribution to rock burst occurrence in brittle coal or rock mass. This paper first studies the mechanical behavior of layer‐crack red sandstone specimens with different geometric configurations of vertical fissures (ie, fissure width, fissure length, and fissure number) through uniaxial compression and Brazilian tests. Then, the digital speckle correlation method (DSCM) and acoustic emission (AE) technique are used to record the deformation and failure processes. Finally, the failure mechanisms of the layer‐crack structure are presented and discussed. Under compressive conditions, the failure process can be divided into compatible support, incompatible support, and postpeak unstable failure stages. An increase in fissure width, as well as fissure length or number, causes an increase in the inner damage accumulation and a decrease in the stiffness coefficient by decreasing the strain of the compatible support stage. Thus, the bearing capacity of the layer‐crack structure is weakened. Under tensile conditions, the tensile ability decreases linearly as the fissure length increases, but the vertical pressure acting on the fissure increases linearly as the fissure width increases. Thus, the tensile strength of the layer‐crack structure decreases as the fissure length (or width) increases.

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“…Sketch of failure mechanism of layer‐crack structure under compression (A) compatible support, (B) incompatible support, and (C) Postpeak instable failure…”

Section: Discussion Of the Failure Mechanism Of The Layer‐crack Strumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on the failure mechanism of layer‐crack structure

Guo

Tan

et al. 2019

Energy Science & Engineering

Self Cite

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“…The earliest research work was the uniaxial compression test on a single fractured specimen conducted by BOMBOLAKIS in 1968 6 . To gain more insight into the influence of prefabricated fractures on rock strength, deformation, and damage modes, scholars have systematically investigated the combination of form 7 – 9 , geometric parameters 10 – 12 , and the number of prefabricated fractures 13 . In addition, the site rock is mostly in a complex stress state, and the study of stress conditions is of great value for the crack extension of fracture specimens.…”

Section: Introductionmentioning

confidence: 99%

Effect of fissure angle on energy evolution and failure characteristics of fractured rock under uniaxial cyclic loading

Zhao

Zhang

et al. 2023

Sci Rep

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To study the influence of fissure angle on the rock damage process and energy evolution characteristics, uniaxial cyclic loading and unloading tests were conducted on fractured rock specimens with different prefabricated fissure angles. The stress–strain curves, mechanical properties, and failure characteristics were analyzed. Subsequently, the energy evolution characteristics and failure mechanisms were investigated. The results showed that the stress–strain curves of fractured specimens fluctuated in the pre-peak phase and rapidly declined in post-peak phase. The peak stresses and strains of fractured specimens initially decreased and then increased with an increase in the fissure angle, whereas the elastic modulus first increased and then decreased. With an increase in the fissure angle, specimen failure changed from shear damage to tensile damage. The input, elastic, and dissipation energies of fractured specimens non-linearly increased with an increase in cyclic loading and unloading. As the number of cycles increased, the energy density decreased in segments with an increase in the fissure angle, and there was a rapid increase in the dissipation energy density before failure occurred. The results can provide a reference for the study of fractured rock failures and their prevention and control design in the field.

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“…Liu studied the strain and stress distribution characteristics of rock specimens containing a single pre-existing fissure under uniaxial compression [2]. Tan carried out uniaxial compressive tests on cubic rock-like specimens with fissures, and the effects of the fissure number on the mechanical properties were studied [3]. In deepburied strata, rock masses are commonly damaged under triaxial compressive conditions.…”

Section: Introductionmentioning

confidence: 99%

Triaxial Compression Strength Prediction of Fissured Rocks in Deep-Buried Coal Mines Based on an Improved Back Propagation Neural Network Model

et al. 2023

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In deep coal mine strata, characterized by high ground stress and extensive fracturing, predicting the strength of fractured rock masses is crucial for stability analysis of the surrounding rock in coal mine strata. In this study, rock samples were obtained from construction sites in deep coal mine strata and intact, as well as fissured, rock specimens were prepared and subjected to triaxial compression tests. A numerical model based on the discrete element method was then established and the micro-parameters were calibrated. A total of 288 triaxial compression tests on the rock specimens under different conditions of confining pressure, loading rate, fissure dip angle, and fissure length, were conducted to obtain the triaxial compressive strength of the fractured rock specimens under different conditions. To address the limitations of traditional back propagation (BP) neural networks in solving stochastic problems, a modified BP neural network model was developed using a random factor and an interlayer mean square error corrected network model evaluation function. The traditional and modified BP neural network models were then employed to predict the triaxial compressive strength of the fractured rock specimens. Through comparative analysis, it was found that the modified BP neural network prediction model exhibited smaller errors and significantly reduced overfitting, making it an effective tool for predicting the strength of fractured rocks in deep coal mine strata.

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Influence of Fissure Number on the Mechanical Properties of Layer‐Crack Rock Models under Uniaxial Compression

Cited by 7 publications

References 32 publications

Experimental study on the failure mechanism of layer‐crack structure

Experimental study on the failure mechanism of layer‐crack structure

Effect of fissure angle on energy evolution and failure characteristics of fractured rock under uniaxial cyclic loading

Triaxial Compression Strength Prediction of Fissured Rocks in Deep-Buried Coal Mines Based on an Improved Back Propagation Neural Network Model

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