Stress distribution rule of roadway affected by overhead mining in gently inclined coal seams group

Kang, Qinrong; Jianxin, Tang; Hu, Hai; Zhang, Weizhong

doi:10.1016/s1003-6326(12)61636-7

Cited by 10 publications

(6 citation statements)

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“…e thickness and dip angle of an orebody limit the flexible use of trolleybuses, which is a major problem in the mine output due to result in excessive losses. e room and pillar mining method has been considered as an effective mining strategy for gently inclined medium-thick orebodies [5][6][7]. However, this method greatly disturbs the initial stress within the rock.…”

Section: Introductionmentioning

confidence: 99%

Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium‐Thick Phosphate Rock

Liu

Shuang-suo

2021

Advances in Civil Engineering

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Gently inclined medium-thick orebodies are generally recognized as the most difficult type of orebody to mine, using current available strategies (i.e., the room and pillar method). In the present study, a similar physical model was used to investigate the roof stress and subsidence for mining gently inclined medium-thick phosphate rock from the Jinning Phosphate Mine, Yunnan Province, China. The stress field, displacement field, and roof failure evolution characteristics of the surrounding rock with stope structures of 3 m, 5 m, or 8 m ore pillars were considered. The results showed that, after mining stopped, obvious pressure relief areas formed above the three stope structures, and pressure-bearing areas formed at the front of the roof. With extending the mining in the working face, the stress relief boundary also gradually increased, and the top of the roof tended to sink with a maximum subsidence of –14.58 mm, –4.67 mm, and –3.48 mm. Due to the mining activity, the overlying strata bent and subsided from top to bottom, creating bending subsidence, fracture, and caving zones.

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Section: Introductionmentioning

confidence: 99%

Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium‐Thick Phosphate Rock

Liu

Shuang-suo

2021

Advances in Civil Engineering

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“…Summarizing the above research, much has been revealed regarding the instability laws of the roadway surrounding rock during the mining of close-distance coal seam groups [27][28][29]. However, most of the above studies focus on mining areas in Shanxi province, Inner Mongolia province, and Poland, Australia, India, Thailand, Upper Silesian Coal Basin and other countries and regions or similar provinces that have thick coal seams, and the structure of the roof formed after mining is thus different from that in the Guizhou mining area.…”

Section: Introductionmentioning

confidence: 99%

Instability Control of Roadway Surrounding Rock in Close-Distance Coal Seam Groups under Repeated Mining

et al. 2021

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In order to solve the problems of roadway stability and easy instability under repeated mining of close-distance coal seam groups, the mechanism and control technology of surrounding rock instability under repeated mining were studied via indoor testing, field testing, physical similarity simulation experiment, and numerical simulation. The results show that the surrounding rock of roadway has low strength, low bearing capacity, and poor self-stabilization ability, and it is vulnerable to engineering disturbances and fragmentation. Affected by the disturbance under repeated mining, the roadway surrounding rock cracks are developed and the sensitivity is strong, and it is prone to large-scale loose and destroyed. The location of the roadway is unreasonable, and the maximum principal stress of the roadway is 3.1 times of the minimum principal stress, which is quite different. Thus, under a large horizontal stress, the surrounding rock undergoes long-range expansion deformation. On the basis of this research, the direction and emphasis of stability control of roadway surrounding rock under repeated mining of coal seam groups in close-distance are shown. A repair scheme (i.e., long bolt + high-strength anchor cable + U-shaped steel + grouting) is proposed, and reduces the risk of roadway instability.

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“…For moderately inclined coal seam mining, scholars have used numerical simulations, field observations and mechanical models to study the movement characteristics of the overlying strata, the interval of periodic weighting, the patterns of stress distribution, the development of cracks and the prediction of surface subsidence, and have a clear understanding [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Process of overburden failure in steeply inclined multi-seam mining: insights from physical modelling

et al. 2021

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Ground surface damage caused by steeply inclined coal seam mining is widely distributed in China, but there is little research on the failure process and movement mechanism of strata induced by steeply inclined multi-seam mining. In this paper, a physical model test is carried out to study the failure process and movement mechanism of overburden in steeply inclined multi-seam stepwise mining. The results show that at the initial stage, the main failure of the rock mass is the small-scale collapse at the initial cut and the roof (stability stage of the rock mass). After the roof is exposed over a certain range, the rock mass in the downhill direction slips into the goaf and gradually destroys the interburdens of the goaf, similar to the displacement effect of dominoes (severe failure stage of the rock mass). When the structure of the goaf fails, the overburden subsides, causing extensive damage to the ground surface. The surface damage directly above the goaf is mainly caused by serious subsidence deformation, while the surface damage in the downhill direction is dominated by cracks.

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Stress distribution rule of roadway affected by overhead mining in gently inclined coal seams group

Cited by 10 publications

References 0 publications

Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium‐Thick Phosphate Rock

Similar Physical Modeling of Roof Stress and Subsidence in Room and Pillar Mining of a Gently Inclined Medium‐Thick Phosphate Rock

Instability Control of Roadway Surrounding Rock in Close-Distance Coal Seam Groups under Repeated Mining

Process of overburden failure in steeply inclined multi-seam mining: insights from physical modelling

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