承压水上无煤柱自成巷开采底板破坏特征模型试验研究

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Abstract With the increasing depth and intensity of coal seam mining in China，floor water inrush has become a constraining factor threatening safe and efficient production of mines. The non-pillar mining with automatically formed roadway，as a new type of mining method above confined water，can effectively reduce the risk of floor water inrush. To explore the differences in floor damage between automatically formed roadway mining and coal pillar mining，a theoretical analysis was first conducted on reduction of floor damage and prevention of water inrush in the non-pillar mining with automatically formed roadway，clarifying its advantages. Afterwards，taking the 11004-working face of Rongkang Coal Mine as the engineering background，a two-dimensional model test system was independently designed，which simulates the Ordovician limestone aquifer with spring sets and embedded water bags，uses lifting hoses and branch pipes as water-conducting channels，and uses a specially designed“cutting- support-protection”integrated device as the key equipment of simulating roof cutting and retention roadway. The distribution laws of confined water lifting，floor stress，and surface displacement in different regions were obtained through the experiment. Finally，based on experimental and theoretical analysis results，a comprehensive governance scheme was proposed. Research has shown that：(1) controlling tension cracks is the key to preventing floor water inrush，reducing shear cracks is the focus of avoiding floor failure，and reducing the depth of mining damage is the fundamental governance measure. (2) The cumulative volume of confined water at each branch on roof-cutting side is 6.1 mL，which is reduced by 84.3，86.4，and 78.8% compared to coal pillar side，collapse column area，and the middle of the working face respectively. The floor on the roof-cutting side exhibits compressive stress throughout the excavation process，while the coal pillar side and the middle of the working face undergo a stress state change of“compression-tension-compression”，resulting in severe damage. Both the coal pillar side and the middle of the working face show the floor heaving，while the roof-cutting side shows compression. Larger positive displacements are more likely to induce water-conducting channels and pose a higher risk of water inrush. (3) The comprehensive governance scheme combining non-pillar mining with automatically formed roadway and regional governance has achieved good application results，and the risk of floor water inrush has been effectively controlled.

Key words： mining engineering non-pillar mining with automatically formed roadway floor failure water inrush model experiment

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	GAI Qiukai1
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	GAO Yubing1
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	HE Manchao1

Cite this article:

GAI Qiukai1,2,3, et al. Model experimental study of floor failure characteristics during non-pillar mining with automatically formed roadway above confined water#br#[J]. , 2025, 44(2): 391-408.

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https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I2/391

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