Undermining of an unlined tunnel in rock

Coulthard, M.A.

doi:10.1201/9781003077527-40

Cited by 2 publications

(1 citation statement)

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“…The main problem in the Yuanbao Bay Mine in Shuozhou, Shanxi, is ensuring the stability of the overlying coal pillars affected by undermining [2,3,[8][9][10][11][12]]. Several theoretical and numerical studies have been conducted to address this problem and evaluate the stability of coal pillars, including the modeling and calculation of coal pillar bearings [13][14][15], determination of the mechanical characteristics of coal pillars under long-term bearing action [16][17][18], investigation of the function evaluation method of the coal pillar stability [19], and the identification of the main factors affecting the stability of coal pillars [20,21].…”

Section: Introductionmentioning

confidence: 99%

Research on Strong Ground Pressure of Multiple-Seam Caused by Remnant Room Pillars Undermining in Shallow Seams

Liang

et al. 2021

Energies

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Numerous room-and-pillar mining goaf are apparent in western China due to increasing small coal mining activities, which causes the collapse of the overlying coal pillars and the occurrence of strong ground pressure on the longwall face and surface subsidence. In this study, Yuanbao Bay Coal Mine, Shuozhou, Shanxi, was selected to study the collapse of the overlying coal pillars on the longwall face and reveal the mechanism of the pillar collapse and the disaster-causing mechanism caused by strong ground pressure. Results show that the dynamic collapse process of coal pillars is relatively complicated. First, the coal pillars on both sides of the goaf are destroyed and destabilized, followed by the adjacent coal pillars, which eventually cause a large-scale collapse of the coal pillars. This results in a large-scale cut-off movement of the overlying strata, and the large impact load that acts on the longwall face causes an unmovable longwall face support. Moreover, the roof weighting is severe when strong ground pressure occurs on the longwall face, causing local support jammed accidents. Furthermore, the data of each measurement point of the strata movement inside the ground borehole significantly increases, and the position of the borescope peeping error holes in the ground drill hole rise steeply. The range of movement of the overlying strata increases instantaneously, and the entire strata begin to move. Research on the mechanism of strong ground pressure can effectively prevent mine safety accidents and avoid huge economic losses.

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