Failure Characteristics and Control Technology of Surrounding Rock in Deep Coal Seam Roadway with Large Dip Angle under the Influence of Weak Structural Plane

Qi, Xueyuan; Wang, Ruijie; Mi, Wentian

doi:10.1155/2020/6623159

Cited by 10 publications

(8 citation statements)

References 15 publications

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“…e practice shows that the asymmetric coupling support technology can not only effectively solve the problem of differential deformation of surrounding rock, but also ensure the coordinated deformation of support structure and surrounding rock, so as to improve the overall stability of the roadway, greatly reduce the repair rate of the roadway, and save the resource support cost [13][14][15][16][17][18]. e shorter sidewall was simplified as a fixed hinge support A, and the taller sidewall was simplified as a movable hinge support B.…”

Section: Stress Analysis Of Uniquely Shaped Roadwaymentioning

confidence: 99%

Research on Stress Distribution Characteristics for Uniquely Shaped Roadway with Hard Roof in Steeply Inclined Coal Seam and Support Technology of Reducing Vibration Impact

Zhang

Hui

Shi

et al. 2021

Shock and Vibration

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This paper presents a comprehensive study of the stress distribution and stability analysis of a uniquely shaped roadway having a steeply dipping hard roof. The coal seam and its roof have a certain impact tendency, which is the internal condition of rock burst. The syncline tectonic stress causes the original rock stress to reach a higher level. The large amount of coal produced in the coal mine and the large movement range of the upper strata cause the huge mining additional stress around the stope. The impact load caused by “cantilever beam” fracture of hard roof can induce and strengthen rock burst. Its engineering geological setting encompasses the mining process and surrounding rock conditions of No. 6 Coal Seam in the 2130 coal mine of Xinjiang. Numerical simulations with theoretical analysis and field measurements investigated a proposed new truss combined support scheme for implementation. A comparison was made of the differences in the state parameters of the road under the new and old support conditions. The application of the new combined support technology changed the form of the stress distribution around the road. Apart from the displacements of the two coal sidewalls, the new support system notably reduced the displacement of roof and floor by 67.8% and 83.6%, respectively. After the implementation of the new support scheme, the frequency of the original rock burst in the working face is greatly reduced, the surrounding rock control and field application effects also remained good, and personnel and equipment safety and production plan have a good guarantee.

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Section: Stress Analysis Of Uniquely Shaped Roadwaymentioning

confidence: 99%

Research on Stress Distribution Characteristics for Uniquely Shaped Roadway with Hard Roof in Steeply Inclined Coal Seam and Support Technology of Reducing Vibration Impact

Zhang

Hui

Shi

et al. 2021

Shock and Vibration

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“…In addition, Dezhong Kong et al [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ] studied the distribution law of floor stress, roof fracture distribution, and large-dip coal seam fracture modes via a similarity simulation and numerical modeling. With the consideration of the asymmetric failure mechanism of overburden, Ding Lang et al [ 15 , 16 , 17 , 18 ] proposed the stability control technology of roadway-surrounding rock. Yongping Wu, Panshi Xie et al studied the time sequence characteristics of spatial migration and the collapse of surrounding rock in stopes and the mechanism of unbalanced ore pressure [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Similarity Simulation on the Movement Characteristics of Surrounding Rock and Floor Stress Distribution for Large-Dip Coal Seam

Cao

Liu

Hang

et al. 2022

Sensors

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The question of how to mine safely in close multi coal seams is the main concern for coal operators, in particular for large-dip coal seams with complex geological and mechanical conditions. This paper presents a detailed similarity simulation on the movement characteristics of the overburden and the stress distribution of underlying strata in terms of a specific coal mine in the Tielieke mining area of the Kubai coalfield via a three-dimensional photogrammetry system and a high-speed static resistance analyzer. The results show that the overburden strata are asymmetrically deformed around the coal pillar and the fracture area is perpendicular to the longwall with an “M” shape when deeper coal is mined. Moreover, the asymmetric movement of overburden results in the non-uniform distribution of stress on the floor of the coal pillar and ribs. In particular, stress is closely related to the location of the longwall, and stress of the coal pillar is much larger when it is closer to the deep side. The floor stress relief degree of the longwall in the deep zone is higher than that of its counterparts, providing a theoretical foundation for a reasonable layout and a support technique for roadways. The main contribution of this research that it can be used as a reference in maintaining the integrity of surrounding rock for large-dip coal seams with close distances.

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“…Compared with a roadway in the nearly horizontal and gently inclined coal seam [2][3][4], this kind of roadway is obviously affected by mining dynamic pressure and asymmetric load, the stress distribution of surrounding rock is very complex, and the deformation difference of roof, floor, and two sides is very significant, often showing obvious asymmetric distribution characteristics [5,6]. Especially when the roof contains weak structural plane, the asymmetric deformation of roadway is more prominent [7]. If we do not fully understand the fracture evolution law and instability mechanism of surrounding rock of this kind of roadway, blindly designing support parameters and support forms, it is very easy to cause instability and damage of this kind of roadway, which will bring great hidden danger to coal mine production and personnel safety, and cause immeasurable economic losses to the country.…”

Section: Introductionmentioning

confidence: 99%

Surrounding Rock Stability Control Technology of Roadway in Large Inclination Seam with Weak Structural Plane in Roof

Chen

et al. 2021

Minerals

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The surrounding rock control technology of mining roadways in large inclination seams with a weak structural plane in the roof is one of the most challenging fields in underground roadway support. In view of the serious deformation of the surrounding rock of the transportation roadway in the 1201 working face of a mine, the deformation and failure characteristics and instability mechanism of the surrounding rock of the roadway are analysed. The self-stability mechanical model of the roof block structure of the roadway with a large inclination under the support effect is established, and the support concept of “high pre-stressed asymmetric” and the combined support method of bolts, wire mesh, and cables are proposed. The rationality of the supporting scheme is verified by numerical simulation. The results show that: compared with bolt and wire mesh support, the maximum shear displacement of the roof’s weak layer under the combined support of bolt, wire meshes, and cable before and after mining is reduced by 86.78% and 83%, respectively, and the maximum total displacement of surrounding rock surface is reduced by 49.22% and 37.1%, respectively. The field monitoring results show that the combined support scheme can effectively control the deformation of the surrounding rock.

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Failure Characteristics and Control Technology of Surrounding Rock in Deep Coal Seam Roadway with Large Dip Angle under the Influence of Weak Structural Plane

Cited by 10 publications

References 15 publications

Research on Stress Distribution Characteristics for Uniquely Shaped Roadway with Hard Roof in Steeply Inclined Coal Seam and Support Technology of Reducing Vibration Impact

Research on Stress Distribution Characteristics for Uniquely Shaped Roadway with Hard Roof in Steeply Inclined Coal Seam and Support Technology of Reducing Vibration Impact

Similarity Simulation on the Movement Characteristics of Surrounding Rock and Floor Stress Distribution for Large-Dip Coal Seam

Surrounding Rock Stability Control Technology of Roadway in Large Inclination Seam with Weak Structural Plane in Roof

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