Failure mechanism of the coal wall at the working face based on an eccentric compression mechanical model DOI Creative Commons
Maolin Tian, J. J. Wang,

Changsheng Wang

et al.

Deep Underground Science and Engineering, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

Abstract The deformation and failure of coal walls in front a working face cause significant difficulties during mining operations. This study reveals the nonuniform distribution bearing pressure based on situ monitoring data numerical simulation. Therefore, an eccentric compression mechanical model was established to characteristics wall. slenderness ratio bar is introduced define walls. results showed that instability occurs when λ > c material ≤ . failure‐type wall spalling related height, eccentricity roof pressure, horizontal force, reaction moment floor. cohesion, internal friction angle coal, upper force Unstable destructive peeling usually at height 0.5–0.6 times while damage determined occur within range 0.4–0.6 depth. findings contribute understanding

Language: Английский

Fracture propagation characteristics and failure mechanisms of parallel-fractured sandstone DOI Creative Commons

Fengpu Liu,

Baoxin Jia, Zhiyang Zhou

et al.

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: April 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.

Language: Английский

Citations

0
Characteristics of crack extension and fracture mechanism of parallel-fissured sandstone DOI Creative Commons

Fengpu Liu,

Baoxin Jia, Zhiyang Zhou

et al.

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

Abstract 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.

Language: Английский

Citations

0
Mechanism and Prevention of Rock Burst in a Wide Coal Pillar under the Superposition of Dynamic and Static Loads DOI Open Access
Bangyou Jiang, Yanan Xu, Wenshuai Li

et al.

Processes, Journal Year: 2024, Volume and Issue: 12(8), P. 1634 - 1634

Published: Aug. 3, 2024

To address the frequent occurrence of rock burst disasters in areas with wide coal pillars during mining western area China, pillar Tingnan mine Shanxi Province was used as research background. Theoretical analysis, numerical simulation, and field tests were to establish mechanical criterion energy for dynamic instability pillars. The process mechanism under static load disturbances revealed, a prevention control scheme proposed. results indicated that when above reached stress failure index met, critical conditions burst. With increasing load, stress, energy, range plastic zone all showed trends on both sides pillar. Under given significantly increased compared those without load. greater more likely undergo instability. evolution divided into three stages: accumulation, local instability, When are exceeded, will occur. reduce loads pillars, release reduction proposed applied onsite. monitoring this plan effectively reduced generated by fracture overlying layer, indicating safe

Language: Английский

Citations

2
Research on mechanism and practice of expansion‐induced fracturing and pressure relief in deep coal mines DOI Creative Commons

Shitan Gu,

Zhiyao Liu, Wenshuai Li

et al.

Energy Science & Engineering, Journal Year: 2024, Volume and Issue: 12(11), P. 5230 - 5244

Published: Oct. 16, 2024

Abstract A nonexplosive expansion method is proposed to apply in the field of rock burst prevention and control coal mine. The principle expansive agent reaction was analysed specimens with one hole two holes were tested without axial stress or an agent. results showed that products exhibited excellent fluidity did not induce secondary concentration within specimens. more severe intricate fractures upon introduction agent, formation crisscross networks cracks occurred both horizontal vertical directions. Stress became pronounced as distance between decreased, making specimen vulnerable cracking. test conducted evaluate effectiveness pressure relief through expansion‐induced fracturing roadway 1318 working face. from demonstrated quantity powder deep area significantly decreased after fell well below early warning index drilling cutting method.

Language: Английский

Citations

0
Failure mechanism of the coal wall at the working face based on an eccentric compression mechanical model DOI Creative Commons
Maolin Tian, J. J. Wang,

Changsheng Wang

et al.

Deep Underground Science and Engineering, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 28, 2024

Abstract The deformation and failure of coal walls in front a working face cause significant difficulties during mining operations. This study reveals the nonuniform distribution bearing pressure based on situ monitoring data numerical simulation. Therefore, an eccentric compression mechanical model was established to characteristics wall. slenderness ratio bar is introduced define walls. results showed that instability occurs when λ > c material ≤ . failure‐type wall spalling related height, eccentricity roof pressure, horizontal force, reaction moment floor. cohesion, internal friction angle coal, upper force Unstable destructive peeling usually at height 0.5–0.6 times while damage determined occur within range 0.4–0.6 depth. findings contribute understanding

Language: Английский

Citations

0