Study on deformation mechanism and control technology of surrounding rock during reuse of gob side entry retaining by roof pre-splitting

He, Fulian; Xu, Xuhui; Qin, Binbin; Li, Liang; Lv, Kai; Li, Xiaobin

doi:10.1016/j.engfailanal.2022.106271

Cited by 30 publications

(9 citation statements)

References 19 publications

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“…Hence, determining the structure type is the primary problem to solve in studying roadway surrounding rock failure 17–19 . Equation () is used for calculating the conditions for the formation of an articulated structure by key overlying strata in large mining height mining 20,21 :

M(1\,-\,\eta )+\sum h(1\,-{K}_{p})\,\lt h\,-\,\frac{q{l}^{2}}{kh{\sigma }_{{\rm{c}}}}.

…”

Section: Failure Mechanism Of Roadwaymentioning

confidence: 99%

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Study on surrounding rock failure mechanism and rational coal pillar width of the gob‐side coal roadway under influence of intense dynamic pressure

Wang

et al. 2023

Energy Science & Engineering

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A reasonable width of the coal pillar is very important to the surrounding rock control of the gob-side roadway. An unreasonable width of the coal pillar will make the roadway to be located within the range of strong mining influence, leading to severe deformation of the roadway. Severe subsidence at the coal pillar side of the roof and serious coal pillar deformation are problems caused by strong dynamic pressure due to mining in the gob-side coal roadway. This paper studies the surrounding rock instability mechanism and rational coal pillar width of the gob-side coal roadway under the influence of intense dynamic pressure. The results show that: (1) Under the condition of large mining height, the roadway overburden is a hinged structure, and an unreasonable coal pillar width makes the gob-side coal roadway to be located below the main roof fracture line. The rotary movement of the key block of the main roof is the main reason for the roadway deformation. (2) According to the evolution law of stress field, displacement field and plastic zone of surrounding rock of roadway under different coal pillar widths during roadway driving and mining were studied, and it is concluded that a 6-m-width coal pillar is the most reasonable. (3) Based on the stress distribution and plasticizing range of surrounding rock in a narrow pillar roadway, the combined support scheme of "anchor cable + grouting + single prop" is proposed and applied to engineering practice. The practice results show that the roadway deformation is well controlled, and the safe mining of the working face is realized.

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M(1\,-\,\eta )+\sum h(1\,-{K}_{p})\,\lt h\,-\,\frac{q{l}^{2}}{kh{\sigma }_{{\rm{c}}}}.

…”

Section: Failure Mechanism Of Roadwaymentioning

confidence: 99%

“…Hence, determining the structure type is the primary problem to solve in studying roadway surrounding rock failure. [17][18][19] Equation ( 1) is used for calculating the conditions for the formation of an articulated structure by key overlying strata in large mining height mining 20,21 :…”

Section: Structural Characteristics Of Overburdenmentioning

confidence: 99%

Study on surrounding rock failure mechanism and rational coal pillar width of the gob‐side coal roadway under influence of intense dynamic pressure

Wang

et al. 2023

Energy Science & Engineering

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“…Zha Wenhua et al [4] used theoretical analysis methods to analyze the deformation characteristics of surrounding rock in narrow coal pillar excavation, and put forward reasonable coal pillar size and excavation time, providing reference for similar engineering conditions. He Fulian et al [5] used theoretical analysis methods to analyze the deformation characteristics of surrounding rock in narrow coal pillar excavation, and put forward reasonable coal pillar size and excavation time, providing reference for similar engineering conditions. Fan Kegong et al [6] analyzed the deformation characteristics of coal pillar in goaf roadway under dynamic pressure and proposed an asymmetric deformation control method for goaf roadway to improve the stress environment of surrounding rock of roadway.…”

Section: Introductionmentioning

confidence: 99%

Research on Roof Cutting and Pressure Relief Technology of Deep Hole Pre-cracking Blasting

Qin,

Zhu

2024

IJE

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The dynamic pressure gob-side entry is affected by the whole mining process of the working face, and the cause of the large deformation is the additional stress generated during the rotary sinking process of the key block. Therefore, in order to alleviate the deformation of surrounding rock of roadway along goaf. The deep hole pre-splitting blasting roof cutting pressure relief method is used to relieve the pressure of the test roadway. In this study, finite element and discrete element models were established by means of numerical simulation and theoretical analysis, and the law of influence of cutting top height and Angle on roof cutting effect is studied. The optimal cutting height and angle are 15 m and 10° towards the gob, respectively. The industrial test results show that the deformation of surrounding rock of the test roadway is controlled within a reasonable range after pressure relief, and the roadway section meets the production demand.

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“…The damage and separation of the roof are the main causes of roadway instability. He et al [8] researched the surrounding rock deformation mechanism during reuse of the gob side entry, and concluded that the surrounding rock failure is mainly affected by the advance abutment pressure. Shi et al [9] researched the stability of surrounding rock in GSR driving in a deep and thick seam and concluded that the displacement and plastic zone of the surrounding rock of the straight wall semi-circular arch roadway are smaller than the corresponding deformation value of the surrounding rock of the rectangular roadway.…”

Section: Introductionmentioning

confidence: 99%

Research on Deformation and Failure Law of the Gob-Side Roadway in Close Extra-Thick Coal Seams

Gao

et al. 2023

Sustainability

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To reveal the deformation and failure law of the gob-side roadway (GSR) and the main influencing factors in close extra-thick coal seams, the research methods of field monitoring, theoretical analysis, and numerical simulation are adopted in this paper. Field monitoring data shows that microseismic events occur and accumulate frequently in the surrounding rock and some overlying key layers of the GSR. Large deformation is experienced in the middle part of roadway near the solid coal side, the middle and upper parts of the roadway near the coal pillar side, and the roadway floor. The overlying strata of the GSR are fractured to form a composite structure as “low-level cantilever beam and high-level masonry beam”. The coal pillar is squeezed and effected by the composite beam structure and the rotation moment M, causing serious bulge in middle and upper part of the coal pillar side. The stability of the solid coal side of the roadway is affected by the stress transferred from gangue contact point. Numerical simulation shows that the immediate roof and key layer breakage are induced by the mining of the 30,501 working face. Shear and tension failures happen in the GSR due to overburden subsidence and rotary extrusion. The stress and displacement at the middle and upper of the roadway on the coal pillar side are larger than the other area. Compared with the solid coal side, the coal on the coal pillar side is obviously more fractured, with a lower bearing capacity. The peak stress in the coal pillar shows up 2 m away from the roadway, which is close to the length of bolt support. The mining-induced stress and the stress transferred from gangue contact point are the direct reasons for solid coal bulge beside the roadway. The peak stress on the solid coal side is located 7 m away from the roadway, at the gangue contact point where overburden fractures. The overburden strata loads and the transferred stress near the gangue contact point are transferred from the sides to the roadway floor. Their coupling effect with the in situ horizontal stress acts as the force source for the plastic floor heave.

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Study on deformation mechanism and control technology of surrounding rock during reuse of gob side entry retaining by roof pre-splitting

Cited by 30 publications

References 19 publications

Study on surrounding rock failure mechanism and rational coal pillar width of the gob‐side coal roadway under influence of intense dynamic pressure

Study on surrounding rock failure mechanism and rational coal pillar width of the gob‐side coal roadway under influence of intense dynamic pressure

Research on Roof Cutting and Pressure Relief Technology of Deep Hole Pre-cracking Blasting

Research on Deformation and Failure Law of the Gob-Side Roadway in Close Extra-Thick Coal Seams

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