scholarly journals Research on failure criteria and collapse height of roadway roof strata based on energy accumulation and dissipation characteristics

2021 ◽  
Author(s):  
Zhu Li ◽  
Hong Zhang ◽  
Ze Jiang ◽  
Guorui Feng ◽  
Jiaqing Cui ◽  
...  
Keyword(s):  
Failure Criteria ◽  
Energy Accumulation ◽  
Energy Accumulation And Dissipation ◽  
Roof Strata

scholarly journals Energy Accumulation and Dissipation of Coal with Preopening under Uniaxial Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xin Wei ◽  
Hao Hu ◽  
Yang Li
Keyword(s):  
Simulation Method ◽  
Particle Simulation ◽  
Energy Evolution ◽  
Coal Specimen ◽  
Energy Accumulation ◽  
Evolution Characteristics ◽  
Optimal Value ◽  
Storage Limit ◽  
Particle Simulation Method ◽  
Energy Accumulation And Dissipation

Energy accumulation and dissipation play an important role during the entire process of rock failure. Some flaws, such as preexisting holes, will influence energy accumulation and dissipation. In order to investigate the energy evolution of coal specimen with preexisting holes under uniaxial compression through numerical approaches, the particle simulation method was used in numerical simulations. In this paper, the energy evolution of coal specimen was theoretically analyzed, and the influence of different hole arrangement, such as diameter, spacing, angle, and number, on the evolution characteristics of energy was also discussed. At the same time, the arrangement of the artificial boreholes for preventing the rockburst was explored. The results show that, compared with the intact coal specimen, the change of diameter, spacing, angle, and the number of holes weakened the coal specimen’s capacity to store energy and release strain energy. When the diameter, the vertical distance, and relative angle of preexisting holes were 15 mm, 10∼15 mm, and 60°, respectively, the energy storage limit reached optimal value. For arrangement of the artificial boreholes, the diameter, spacing, and angle can be designed on the basis of those optimal values. This study has a guiding significance in designing the arrangement of the artificial boreholes for mitigation of rockburst.

scholarly journals Analytical Solution for the Deformation and Support Parameters of Coal Roadway in Layered Roof Strata

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Kai Wang ◽  
Bao-gui Yang ◽  
Zhong-kui Wang ◽  
Xiao-long Wang
Keyword(s):  
High Efficiency ◽  
Design Method ◽  
Beam Theory ◽  
High Strength ◽  
Failure Criteria ◽  
Key Stratum ◽  
Coal Roadway ◽  
The Stability ◽  
Roof Strata

In order to meet the security and high-efficiency production needs, high-strength bolt (cable) reinforcement technology is usually used to maintain the stability of roadways. However, due to the great variability of lithology and mechanical properties, the failure form and stability of the layered roof in coal roadways are significant differences. The traditional supporting design method of the layered roof support in coal roadways is the engineering analogy method, which depends on experiences rather than theoretical analysis. Based on the theory of the elastic foundation beam and key stratum, this paper establishes a simplified analytical model of layered roof strata in coal roadways. Based on the Mohr-Coulomb theory, this paper gives the failure criteria of the layered roof strata, and the failure range of the layered roof strata is obtained. The length and pretightening force of bolt (cables) of the layered roof strata can be calculated based on the suspension theory and composite beam theory, which providing a quantitative theoretical basis for the determination of supporting parameters. Finally, as a case, the layered roof strata failure range and supporting parameters of the S1301 auxiliary transportation roadway in Gucheng coal mine are calculated.

Influence of Neutron Irradiation on Energy Accumulation and Dissipation during Plastic Flow and Hardening of Metallic Polycrystals

2010 ◽  
Vol 7 (1) ◽  
pp. 102175 ◽  
Author(s):  
D. A. Toktogulova ◽  
M. N. Gusev ◽  
O. P. Maksimkin ◽  
F. A. Garner ◽  
Jeremy T. Busby ◽  
...  
Keyword(s):  
Plastic Flow ◽  
Neutron Irradiation ◽  
Energy Accumulation ◽  
Energy Accumulation And Dissipation

scholarly journals Analysis of Energy Accumulation and Dissipation of Coal Bursts

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1816 ◽  
Author(s):  
Xiaohan Yang ◽  
Ting Ren ◽  
Alex Remennikov ◽  
Xueqiu He ◽  
Lihai Tan
Keyword(s):  
Energy Accumulation ◽  
Energy Accumulation And Dissipation ◽  
Coal Bursts
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