Research of roadway deformation induced by mining disturbances and the use of subsection control technology

Wu, Pengfei; Li, Bing; Jin, Jiaxu; Li, Gang; Wang, Beifang; Guo, Bin; Yang, Zetao

doi:10.1002/ese3.1094

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…A 3D model size is 130 m × 120 m × 71 m. The bottom of the 3D model is fixed vertically, and the front and back, left and right surfaces are fixed horizontally 50,51 . A compensation stress of 6 MPa is applied to the top to simulate the influence of the dead weight of rock strata 52,53 . The roadway size is 4.0 m × 2.4 m (width × height), and the roof support is the same as the original scheme.…”

Section: Roadway Deformation Analysis and Control Methodsmentioning

confidence: 99%

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Research on gob‐side entry‐retaining technology with coal rib and corner strengthened support in soft rock strata

Zhu

Lou

et al. 2023

Energy Science & Engineering

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The gob‐side entry‐retaining by roof cutting and pressure relief (GERRC) method is an advanced no‐pillar mining method that can significantly improve coal recovery and reduce roadway accidents. However, according to case studies, there is relatively little research on the application of the GERRC method in geological conditions of soft rock formations (especially when the roof and floor are both mudstone), and such research is needed. Therefore, based on the typical soft strata of the Xinyi Coal Mine, this paper analyzes the failure mechanism of the roadways and proposes the GERRC method with coal rib and corner strengthened support (CRCSS). The evaluation indexes of the roof convergence rate and cable safety margin are established, and the effects of roof cutting and CRCSS on roadway deformation control are explored by a numerical comparison test. The results show that roof cutting has a limited effect on roadway deformation. The deformation can be reduced by 75.77% by implementing CRCSS on the basis of GERRC. Then, the evolution characteristics of roadway stress and deformation in the process of mining are further discussed through field contrast tests. The field application results show that compared with that of GERRC with conventional support, the surrounding rock deformation of GERRC with CRCSS is reduced by more than 55%, the safety margin of the cable is improved. The overpressure of the hydraulic prop is diminished, and the stability distance of the roadway is reduced by approximately 30%. Finally, this paper discusses the mechanism to control roadway deformation by CRCSS. This research expounds the rationality of CRCSS, and the results can provide a reference for other situations with similar geological conditions.

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Section: Roadway Deformation Analysis and Control Methodsmentioning

confidence: 99%

“…stress of 6 MPa is applied to the top to simulate the influence of the dead weight of rock strata. 52,53 The roadway size is 4.0 m × 2.4 m (width × height), and the roof support is the same as the original scheme. During the numerical modeling process, separate groups are set up on the roof of the panel.…”

Section: On-site Deformation Characteristicsmentioning

confidence: 99%

Research on gob‐side entry‐retaining technology with coal rib and corner strengthened support in soft rock strata

Zhu

Lou

et al. 2023

Energy Science & Engineering

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“…They adopted the method of UDEC numerical simulation combined with theoretical analysis to reveal the evolution characteristics of the superstructure and analyzed the influence of the offset change on the stability of the coal pillar, providing a reference for roadway decompression under similar conditions. Wu et al 17 aimed at the instability of the roadway under the superposition of mining stress in the close‐distance coal seam, the asymmetric distribution of principal stress was verified by numerical simulation method, and the sectional reinforcement measures were put forward for field application. On the basis of the half‐plane theory, Sun et al 18 analyzed the stress distribution of the floor with mathematical software.…”

Section: Introductionmentioning

confidence: 99%

Failure mechanism and divisional differentiated control of surrounding rock in mining roadway under remaining coal pillar in close‐distance coal seam

Chen

et al. 2023

Energy Science & Engineering

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Regarding the issue of intense mining pressure appearing in the underlying gateway below the remaining coal pillar in the close‐distance coal seam (the remaining coal pillar is perpendicular to the underlying section coal pillar), 401 working face is used as the engineering background. Field measurements, laboratory experiments, numerical simulations, and engineering verification techniques are used to study the abutment pressure's evolution properties and the plastic zone's propagation laws before and after the underlying coal seam roadway experienced the mining impact. The conclusions are as follows: ① The maximum plastic area on the two sides and the roof of the roadway underlying the gob are up to 2 and 1.5 m, whereas the maximum plastic area on the two sides and the roof of the roadway underlying the remaining coal pillar are up to 5 and 4.5 m, respectively. Moreover, the plastic area extends along the two sides, and the section coal pillar is completely broken when the working face is mined below the remaining coal pillar. ② The stress increase coefficient K in the overlap area of the remaining coal pillar and the underlying section coal pillar reaches 3.4 when the mining face penetrates the underlying remaining coal pillar and the advance abutment pressure is overlaid with the concentrated stress of the coal pillar. ③ When the underlying working face is mined to 4, −2, −8, and −14 m away from the remaining coal pillar, the damage range of the roadway 5–10 m ahead increases in turn. At the same time, the maximum plastic area of the roof passes through the plastic area of the upper coal seam floor. Therefore, the underlying and transition areas on both sides of the remaining coal pillar are divided into Area I (15 m) → Area II (the most complicated area to control under the remaining coal pillar, 20 m) → Area III (25 m) according to the width. Furthermore, the divisional differentiated combined control technology of channel steel truss anchor cable with joint double‐way locking control function of roof and coal pillar in Areas I and III, while channel steel truss anchor cable with joint double‐way locking control function of roof and side + high resistance integral door‐type support is proposed in Area II. Field engineering practice shows that the deformation of the roadway surrounding rock can be controlled within 210 mm after adopting the above divisional combined control technology. Finally, the mining operation can safely and efficiently pass through the remaining coal pillar. The research results have important reference values for surrounding rock control of mining roadways in the overlapping area of similar “+”‐type cross‐working face.

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Research on the Deformation and Failure Characteristics and Control Technology of Mining Area Rises under the Influence of Mining Stress

et al. 2022

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Affected by mining stress, roadways surrounding rock face problems such as serious deformation and failure and difficult support. In this study, with the II2 mining area rise in Taoyuan Coal Mine taken as the engineering background, the evolution laws of stress, deformation and plastic zone area of the mining area rises during the advance process of the working face were explored with the aid of FLAC3D software. The results suggested that the stress, deformation and plastic zone area of the surrounding rock increase significantly when the distance between the working face and the track rise is less than 20 m. Based on this finding, it was further determined that the stopping line of the II8222 working face should be at least 20 m away from the track rise. Furthermore, in accordance with the deformation and failure characteristics of surrounding rock under the influence of mining stress, this paper conducted a simulation on four support schemes of mining area rises, and quantitatively analyzed the mechanical response of a roadway surrounding rock under these support schemes. The simulation results revealed that the support scheme of “bolt-mesh-spray-cable + grouting bolt” can effectively deal with the influence of mining stress on the working face. Meanwhile, an engineering application was carried out. By monitoring the surface displacement of the surrounding rock, it was found that the deformation of the roadway surrounding rock was effectively controlled, and a remarkable support effect was achieved. In short, the proposed support scheme greatly improved the stability and safety of surrounding rock in the mining area rise under the influence of mining stress.

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Research of roadway deformation induced by mining disturbances and the use of subsection control technology

Cited by 4 publications

References 26 publications

Research on gob‐side entry‐retaining technology with coal rib and corner strengthened support in soft rock strata

Research on gob‐side entry‐retaining technology with coal rib and corner strengthened support in soft rock strata

Failure mechanism and divisional differentiated control of surrounding rock in mining roadway under remaining coal pillar in close‐distance coal seam

Research on the Deformation and Failure Characteristics and Control Technology of Mining Area Rises under the Influence of Mining Stress

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