Roof Failure Mechanism and Control Technology of Large Section Open‐Off Cut in Soft Rock Strata with Thin Thickness

Li, Chen; Li, Jun; Lian, Xiaoyong; Li, Yongen; Xue, Qi; Feng, Jian

doi:10.1155/2021/5533741

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…Influence of nearby small kiln crossborder mining and geological structure and other factors, the open-off cut has to be laid below the mining gob when the lower slice coal resources mining. With the increase in mine production and the enlargement of fully mechanized mining equipment in recent years, the section of the open-off cut has continuously enlarged, and it is more difficult to control the stability of the surrounding rock [2][3] [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the top coal stability of the large section open-off cut under the gob in thick seams slicing mining

Chai

Liu

Gao³

et al. 2022

Preprint

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The reserved thickness of top coal has an important influence on the stability of a large section open-off cut under gob in the thick seams slicing mining. The destabilization extremum conditions of the open-off cut top coal were derived from by elastic-plastic theory, and the optical fiber sensing technology was utilized to monitor the top coal deformation law with different thicknesses (3, 3.5, and 4m) in the physical similar simulation experiment in the paper. The results show that the top coal thickness is greater than 3.4m without tension cracks. In the vertical direction, the top coal of the LSOOC is divided into mining and excavation disturbance zones under the influence of the upper slice coal mining and the excavation disturbance. In the direction of the span of the open-off cut, the top coal can be divided into the roof fall risk zone and the warning zone. The deformation changes from exponential to linear to logarithmic in the roof fall risk zone, and it changes from linear to logarithmic in the roof fall warning zone as the number of excavations increases. The sinking amount in the two zones is smaller as the thickness of the top coal becomes larger. It is comprehensively determined that the thickness of the top coal of open-off cut is set as 3.5m, the stability is moderate, and the field application shows that the integrity of the top coal is good after support, and the maximum off-layer value is 6mm, which can satisfy the production requirements.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of the top coal stability of the large section open-off cut under the gob in thick seams slicing mining

Chai

Liu

Gao³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Influence of nearby small kiln cross-border mining and geological structure and other factors, the open-off cut has to be laid below the mining gob when the lower slice coal resources mining. With the increase in mine production and the enlargement of fully mechanized mining equipment in recent years, the section of the open-off cut has continuously enlarged, and it is more difficult to control the stability of the surrounding rock 4 – 6 .…”

Section: Introductionmentioning

confidence: 99%

Analysis of the top coal stability of the large section open-off cut under the gob in thick seams slicing mining

Chai

Liu

Gao

et al. 2022

Sci Rep

View full text Add to dashboard Cite

The reserved thickness of top coal has an important influence on the stability of a large section open-off cut under gob in the thick seams slicing mining. The destabilization extremum conditions of the open-off cut top coal were derived from by elastic–plastic theory, and the optical fibre sensing technology was utilized to monitor the top coal deformation law with different thicknesses (3, 3.5, and 4 m) in the physical similar simulation experiment in the paper. The results show that the top coal thickness is greater than 3.4 m without tension cracks. In the vertical direction, the top coal of the large open-off cut is divided into mining and excavation disturbance zones under the influence of the upper slice coal mining and the excavation disturbance. In the direction of the span of the top coal can be divided into the roof fall risk zone and the warning zone. The deformation changes from exponential to linear to logarithmic in the roof fall risk zone, and it changes from linear to logarithmic in the roof fall warning zone as the number of excavations increases. The sinking amount in the two zones is smaller as the thickness of the top coal becomes larger. It is comprehensively determined that the thickness of the top coal of open-off cut is set as 3.5 m, the stability is moderate, and the field application shows that the integrity of the top coal is good after support, and the maximum off-layer value is 6 mm, which can satisfy the production requirements.

show abstract

Roof Failure Mechanism and Control Technology of Large Section Open‐Off Cut in Soft Rock Strata with Thin Thickness

Cited by 2 publications

References 24 publications

Analysis of the top coal stability of the large section open-off cut under the gob in thick seams slicing mining

Analysis of the top coal stability of the large section open-off cut under the gob in thick seams slicing mining

Analysis of the top coal stability of the large section open-off cut under the gob in thick seams slicing mining

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