Experimental and simulation study on compressive failure of rock with pre-Y-shaped cracks

PLoS ONE, Год журнала: 2024, Номер 19(11), С. e0312344 - e0312344

Опубликована: Ноя. 14, 2024

A large number of joints and fissures are prevalent in the rock mass, which has an important influence on mechanical properties mass. To study failure characteristics Y-cracked rocks, paper analyzes different angles prefabricated rocks strength crack extension evolution through uniaxial compression indoor tests discrete element PFC 2D numerical simulation. The results indicate that stress-strain curves containing cracks exhibit five stages: initial pore-fracture compaction stage, elastic stable development unstable post-peak rupture. peak specimen shows evolutionary process decreasing, then increasing, decreasing with increase Y-shaped angle. sample is mainly caused by shear expansion at tip. Angle directly affect generation new cracks. final result microcrack propagation, convergence penetration to form macroscopic damage zone. Finally, combined simulation, distribution micro-cracks pattern compared analyzed, it found two good agreement, reflects rationality model.

Язык: Английский

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Characteristics of crack extension and fracture mechanism of parallel-fissured sandstone

Research Square (Research Square), Год журнала: 2025, Номер unknown

Опубликована: Март 4, 2025

It is of great significance to study the fracture mechanism defect-bearing rocks. Through uniaxial compression test and discrete element numerical simulation on fixed inclination parallel-fissured sandstone, mechanical properties, acoustic emission full dynamic time-varying evolution law sandstone with different fissure spacing number are investigated help multi-signal characteristics. The results show that: There an obvious correlation between fissures elastic modulus, no strength. modulus peak prefabricated determines basic aggregation type cracks, mainly affects diversity cracks. Spalling damage occurs at middle position through-bridge shear plate crack both sides specimen. Through-bridge cracks a common in specimens containing parallel fissures, which influence initiation location main specimen, affect overall strength specimen by changing local narrowest width "column" structure. mutual excitation tension each sudden increase shear-tension ratio corresponds macroscopic rupture multifractal dimension describes complexity signals more finely, decrease parameters Δα Δf(α) can be used as short-range prediction signal for occurrence disasters.

Язык: Английский

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Comparative study of shear performance of fully-grouted and energy-absorbing bolts under varying normal stress during cyclic shear tests

Bulletin of Engineering Geology and the Environment, Год журнала: 2025, Номер 84(4)

Опубликована: Март 8, 2025

Язык: Английский

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Study on micro-parameters of parallel bond model based on machine learning algorithm

Computational Particle Mechanics, Год журнала: 2025, Номер unknown

Опубликована: Март 14, 2025

Язык: Английский

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Fracture propagation characteristics and failure mechanisms of parallel-fractured sandstone

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Апрель 24, 2025

It is important to study the fracture mechanism of fractured rocks. Uniaxial compression tests and discrete element numerical simulations were conducted on sandstone specimens with fixed dip angles parallel fractures. With help acoustic emission detection technology, effects different spacings number fractures mechanical properties, full dynamic time-varying evolution investigated. The results show that: there an obvious correlation between elastic modulus no strength. There clear relationship spacing, modulus, peak spacing determines basic type crack aggregation, cracks mainly affects diversity aggregation types. Spalling damage occurs at middle position through-bridge shear cracks, plate both sides specimen. Through-bridge are a common in containing fractures, which influence initiation location main specimen, affect overall strength specimen by changing local narrowest width "column" structure. mutual excitation tension each sudden increase shear-tension ratio corresponds macroscopic rupture multifractal parameters can provide more detailed description signal complexity. abrupt changes Δα Δf(α) serve as short-range prediction indicators for disaster occurrences.

Язык: Английский

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Cracking mechanisms of fissure-hole specimens under compression-shear conditions: insights from sand 3D printing technology and DEM simulations

Theoretical and Applied Fracture Mechanics, Год журнала: 2025, Номер unknown, С. 105017 - 105017

Опубликована: Май 1, 2025

Язык: Английский

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Effects of a single flaw on failure and acoustic emission characteristics around circular opening subjected to biaxial compression

Engineering Failure Analysis, Год журнала: 2024, Номер unknown, С. 109008 - 109008

Опубликована: Окт. 1, 2024

Язык: Английский

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