Analysis on Characteristics of Surface Subsidence with Han Jia Wan Coal Mine

Xue, Yongji; Wang, Peng; Li, Xing Liang

doi:10.4028/www.scientific.net/amr.524-527.520

Cited by 2 publications

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References 2 publications

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“…When there are dip angles and faults in overburden and coal seams, a variety of numerical simulation models with different dip angles and different fault forms can be constructed by simulation to study the characteristics of overburden and surface failure under complex conditions from the perspective of numerical simulation. According to mining subsidence theory and mechanical theory [44][45][46], the surface damage range can be calculated more accurately rather than qualitative analysis. When mining SBTCS, the DTR and aeolian sand thickness to bedrock thickness ratio (ASBR) should be considered.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Overburden and Ground Failure in Mining of Shallow Buried Thick Coal Seams under Thick Aeolian Sand

et al. 2022

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Mining can lead to overburden failure and ground damage, which are more severe in mining shallow buried thick coal seams (SBTCS) under thick aeolian sand (TAS). We attempted to discover characteristics of mining in this particular geological condition through theoretical derivation and numerical simulation, and field monitoring. Theoretical methods, combined with numerical simulation and field monitoring methods, reveal the essence of the development and distribution of surface cracks caused by mining SBTCS and depth to thickness ratio (DTR) to be 13.43, less than 15. The findings show that, when mining SBTCS, the overburden breaks down periodically, the initial collapse distance is greater than the collapse step, approximately 55 m on average, and the collapse step is approximately 45 m, on average, in the Daliuta Coal Mine. The collapsed blocks are stacked into goaf and form “masonry beams”, and many cracks and pores are generated between the blocks. The weak stress of the aeolian sand layer causes the movement angle in the aeolian sand layer to be smaller than that in the bedrock, and leads to much sheer, tension and compression failure on the ground, and the main forms of cracks are compression uplift, tensile cracking, shear step.

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Section: Discussionmentioning

confidence: 99%

Characteristics of Overburden and Ground Failure in Mining of Shallow Buried Thick Coal Seams under Thick Aeolian Sand

et al. 2022

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“…However, the above studies are focused on the shallow seam mining [33,34]. ere are few studies on the mechanism and development of surface cracks in the near-shallow seam mining (coal seam depth > 150 m) [35].…”

Section: Introductionmentioning

confidence: 99%

Research on Surface Failure Law of Working Faces in Large Mining Height and Shallow Buried Coal Seam

Pang

Bao³

et al. 2020

Advances in Civil Engineering

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In the process of high-intensity and large-space mining in Shendong mining area, various surface cracks are generated on the surface, resulting in serious damage to the surface buildings and the local ecological environment. To study the influence of overlying rock movement on surface failure of near-field single key strata of near-shallow buried and large mining height working face, the relationship between overburden movement, strata pressure appearance, and surface failure at working face 52307 in Daliuta mining area was analyzed by field measurement and numerical simulation. The results show the following: (1) there is only one thick and hard key stratum in the overburden of large mining height and near-shallow buried working face. Under the condition of presplitting roof blasting, the first weighting step is still as high as 95 m, and the periodic breaking step of roof is 20–30 m. During the weighting, the working resistance of support is still close to the rated resistance. (2) The single key stratum plays an obvious role in controlling overburden movement. After the first weighting of the working face, a stepped subsidence crack appears on the surface within a short time, and the crack lags behind the working face for about 5 m. (3) During each periodic weighting process, the breaking and subsidence of key blocks are accompanied by surface cracks.

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Analysis on Characteristics of Surface Subsidence with Han Jia Wan Coal Mine

Cited by 2 publications

References 2 publications

Characteristics of Overburden and Ground Failure in Mining of Shallow Buried Thick Coal Seams under Thick Aeolian Sand

Characteristics of Overburden and Ground Failure in Mining of Shallow Buried Thick Coal Seams under Thick Aeolian Sand

Research on Surface Failure Law of Working Faces in Large Mining Height and Shallow Buried Coal Seam

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