Energy release induced rockbursts based on butterfly-shaped plastic zones in roadways of coal reservoirs

Gao, Xu; Ma, Zhenkai; Shi, Haoyu; Feng, Jian

doi:10.1371/journal.pone.0255044

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…The roadway is excavated along the 3# coal seam floor, and the cross-section of the roadway is rectangular, and the cross-sectional size is 5.8 m × 4 m (width × height). The Moore-Coulomb constitutive model was used for this simulation, and the model failure was consistent with the Moore-Coulomb failure criterion 28 . In order to simulate the actual geological environment, the surrounding and bottom surfaces of the model adopt normal displacement constraints, and the upper boundary is free and bears the uniform load acting on the boundary by the overlying rock.…”

Section: Numerical Simulation Analysis Of the Effect Of High Prestres...mentioning

confidence: 99%

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

Jia

Fan

et al. 2023

Sci Rep

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Aiming at the problem of large deformation and difficulty in surrounding rock control of the top coal roadway in thick seam, theoretical analysis, theoretical analysis, numerical simulation, orthogonal matrix analysis and other methods were used to study the roof deformation and support parameter optimization of the top coal roadway in thick seam. Firstly, the structural model and roof mechanical model of the top coal roadway in thick seam were established, and the deformation coefficient TK was defined based on the relationship between curvature radius and bending moment, maximum bending moment and ultimate tensile strength of beam. According to the ratio of deformation rate between TK and beam to determine the roof deformation mode of top coal roadway, the discriminant conditions of roadway roof stability under two deformation conditions are obtained. Due to the characteristics of serious coal-rock fragmentation, large roof deformation, and integration of top coal and side coal. Therefore, the combined support method of “high prestressed long and short anchor cables” is proposed by double arch bearing structure control technology. Finally, based on the orthogonal matrix analysis method of supporting parameters optimization of the top coal roadway in thick seam, the analysis amount of supporting scheme is significantly reduced, the comprehensive evaluation of multi-factor and multi-supporting effect of roadway support is realized, and the optimal supporting scheme is obtained. Compared with the surrounding rock of the roadway without support, the deformation of the roof is reduced by 27.27%, the deformation of the two sides is reduced by 45.24%, and the tensile failure volume is reduced by 54.66%. The top coal roadway in thick seam has been effectively controlled, which provides guarantee for high yield and high efficiency of the mine.

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Section: Numerical Simulation Analysis Of the Effect Of High Prestres...mentioning

confidence: 99%

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

Jia

Fan

et al. 2023

Sci Rep

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show abstract

“…Yi et al [29] studied the transfer and dissipation of strain energy in deep roadway surrounding rock under strain softening and dilatancy, and obtained some beneficial results. Based on the Mohr-Coulomb yield criterion and the generalized form of Hooke's law, Gao et al [30] derived the elastic strain-energy density equation of the element under three-dimensional stress state. On this basis, the energy absorption and release of surrounding rock during the evolution of coal reservoir roadway are quantitatively analyzed.…”

Section: Plos Onementioning

confidence: 99%

A method for determining the optimum supporting opportunity of roadway based on energy dissipation

Wu,

Peng,

Liu

et al. 2023

PLoS ONE

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The time and space of the support structure applying is related to the overall stability of the roadway after excavation directly. Designed twenty-four groups of roadway support schemes with time and space dimensions, and studied the stability characteristics of roadway in different schemes by using Fast Lagrangian Analysis of Continua in Three Dimensions. The main conclusions are as follows: the influence of energy dissipation (time) and support position (space) on the stability of the roadway is not a linear relationship, and supporting at the appropriate opportunity can be beneficial. Established the "displacement-dissipation energy" curve, founding that there is an obvious "jump" phenomenon in the dissipation energy of surrounding rock during the process of gradually increasing displacement. A novel method for determining the optimum supporting opportunity of roadway based on energy dissipation was proposed, based on the above finding. This study can provide an original idea for the determination of roadway supporting opportunity.

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“…When the ratio of the maximum principal stress to the minimum principal stress is small (like 1.5), the shape of the plastic zone around the hole is roughly elliptical [23], whereas when the ratio of the maximum principal stress to the minimum principal stress reaches more than about 2.5, the shape of the plastic zone around the hole changes to a butterfly shape [24], which is considered extremely dangerous. Butterfly failure theory has been successfully used to reveal the mechanisms of many dynamic disasters such as rock burst [25,26], roof fall [27], earthquake [28,29], fault formation [30], coal and gas outburst [31], and so on. But it should be pointed out that research on the shape of the plastic zone around a hole only involves the use of theoretical research and numerical simulation methods and it has not been perfectly verified at the laboratory and field scales.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Butterfly Shape of the Plastic Zone around a Hole near Rock Failure

Zhang,

Yu,

Ren

et al. 2024

Fractal Fract

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The precursor of rock failure around a hole has always been one of the research hotspots in the field of rock mechanics, and the distribution of the plastic zone is often adopted to reflect the location and form of rock failure. The shape of the plastic zone around a hole before rock failure can guide the mechanism of and early warning methods for geotechnical engineering disasters, while previous theoretical research and numerical simulation results show that the shape of the plastic zone around the hole is butterfly shaped under specific stress, which is referred to as butterfly failure theory. Studies also indicate that the butterfly shape of the plastic zone around a hole is considered to be the main cause of many disasters, which signifies the importance of studying the morphology of the plastic zone near rock failure. Therefore, this study is committed to finding the specific shape of the plastic zone near rock failure through relatively accurate and a high number of AE event location results, and the final experimental results show that the plastic zone around the hole is basically a butterfly shape near rock failure. This study verifies the correctness of the butterfly failure theory and provides an important reference for the study of geotechnical engineering disaster mechanisms and monitoring methods. The fact that the plastic zone in the early stage of rock failure in this study tends to be butterfly shaped preliminarily indicates the fractal law of rock failure. In the moment before rock failure, the distribution of AE events is more regular, which leads to large-scale collapse type failure.

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Energy release induced rockbursts based on butterfly-shaped plastic zones in roadways of coal reservoirs

Cited by 8 publications

References 13 publications

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

Supporting optimization of thick seam roadway with top coal based on orthogonal matrix analysis

A method for determining the optimum supporting opportunity of roadway based on energy dissipation

Experimental Study on the Butterfly Shape of the Plastic Zone around a Hole near Rock Failure

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