Deformation and failure characteristics of anchorage structure of surrounding rock in deep roadway

Jing, Hongwen; Wu, Jiangyu; Yin, Qian; Wang, Ke

doi:10.1016/j.ijmst.2020.06.003

Cited by 84 publications

(33 citation statements)

References 8 publications

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“…Up to now, most scholars place their academic focus on the stability control of coal and rock system after the occurrence of dynamic disasters in the working face. Their research achievement has solved most problems of dynamic disasters caused by slippage and instability (Tuncay et al 2021;Jing et al 2020;Maleki 2017). However, quite little has been done to study the disaster-causing mechanism of initiation precursor in the case that the energy released in the far eld of the coal-rock system acts on the rock mass structure in the near eld.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Yi-shan

2021

Preprint

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The slippage initiation and induced instability of roadway surrounding rock are highly likely to cause dynamic disasters, severely influencing the safety production of mining. With the optical-mechanical monitoring test of the deformation localization of energy dissipation, this study established the optical index of coal deformation equilibrium degree under load, and obtained the evolution law of coal deformation equilibrium degree. After analyzing the relationship between tensile-sliding effect and mechanical behavior of coal deformation field, it proposed the strain energy ratio coefficient. The results indicate that the strength reduction of coal body is affected by the deformation accumulation of loading displacement field. The sliding displacement of the stable sliding type specimen occurs 5.5s earlier than tensile displacement，which is 4.4s longer than the instantaneous instability type specimen. The instability type of coal is closely related to the tangent angle of the strain energy ratio coefficient and the damage persistence characteristics. The damage accumulation of stable equal amplitude contributes to the stable failure, and the damage accumulation of interval equal amplitude influences the instantaneous instability development. The fracture expansion stage is the main stage of energy consumption damage accumulation. That is, the main energy consumption damage accumulation stage of the stable slip coal is the stable crack expansion stage, with the damage proportion of 35.89%, while the damage proportion of instantaneous instability coal in the unsteady crack expansion stage is 84.226%. The study provides theoretical reference for the fracture law and risk monitoring of coal slippage.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Yi-shan

2021

Preprint

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“…To reduce the deformation and damage to a wide roadway driven in soft coal seam, making and implementing a reasonable support and reinforcement plan are mandatory [24][25][26][27][28]. In this case, the large section coal roadway should be strengthened by grouting and then supported by bolt-mesh-anchors combined with constant resistance and large deformation (CRLD) anchor cables [29][30][31] Because the technical scheme includes roadway expansion, roof cutting, and road-inside filling, the project's full name was Integrated Expanding-cutting-filling with Gobside Entry Retaining (IEGER). A cross section of the IEGER scheme in a thick three-soft seam is shown in Figure 5.…”

Section: Project Design and Implementationmentioning

confidence: 99%

Theory and Application of Gob-Side Entry Retaining in Thick Three-Soft Coal Seam

Jun-chao

Zhang²

2021

Geofluids

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With the characteristic of less roadway excavation and high resource recovery, gob-side entry retaining (GER) technology is a safe and efficient green mining technology. Many experts and scholars have done extensive research on its principle and application. However, GERs are rarely used in thick soft coal seams. In this paper, based on the geological conditions of a coal mine in China, we propose a novelty approach of GER in thick three-soft coal seam (it means a single seam with a soft roof and a soft floor). The engineering scheme includes roadway expansion, large section roadway support, cutting roof to relieve pressure, and road-inside backfill body construction. The established mechanical and numerical calculation models effectively guide the engineering practice. Field observations showed that all the processes met the requirements of field production. The research results could provide theoretical guidance for the application of GER under similar geological conditions.

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“…There are 55 coal mines with mining depth of more than 1000 m, mainly distributed in Shandong, Henan, Anhui, Hebei, Heilongjiang, Jilin, and Liaoning in the eastern and northeast regions. The maximum mining depth reaches 1501 m [7][8][9][10][11][12]. The specific distribution is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Research on the Evolution Characteristics of Floor Stress and Reasonable Layout of Roadways in Deep Coal Mining

Zhang

et al. 2021

Geofluids

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The safe and efficient mining of deep coal resources is severely restricted by the dynamic disasters caused by high gas and high ground stress. Taking a deep mine in China as the research background, a mechanical model of the front supporting stress with the working face was constructed through theoretical calculations. Based on the limit equilibrium theory, the stress distribution in the plastic zone and the elastic zone of the lateral working face was derived; based on semi-infinite plane mechanics model, the floor vertical and horizontal stress distribution was deduced. Then, the roadway surrounding rock stress and displacement field distribution evolution characteristics were revealed through numerical simulation. On this basis, the reasonable floor gas drainage roadway (FGDR) layout was determined: internal staggered layout was used with FGDR, the vertical distance to the working face is 20 m, and the horizontal distance to the working face end is 15 m; the open-off cut of FGDR was arranged in an external staggered layout, the vertical distance to the working face is 20 m, and the horizontal distance to the open-off cut of the working face is 15 m. It is an important practical significance for the layout of FGDR, the control of surrounding rocks, and the improvement of gas drainage effects under similar conditions through the research results.

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Deformation and failure characteristics of anchorage structure of surrounding rock in deep roadway

Cited by 84 publications

References 8 publications

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

WITHDRAWN: Experimental Study on the Law of Energy Dissipation and Damage in Coal Body Based on Local Tensile-Sliding Effect

Theory and Application of Gob-Side Entry Retaining in Thick Three-Soft Coal Seam

Research on the Evolution Characteristics of Floor Stress and Reasonable Layout of Roadways in Deep Coal Mining

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