Stability Analysis and Control Technology of Gob-Side Entry Retaining with Double Roadways by Filling with High-Water Material in Gently inclined Coal Seam

Xie, Shengrong; Wang, En; Chen, Dongdong; Li, Hui; Jiang, Zheng; Yang, Hongzeng

doi:10.21203/rs.3.rs-659048/v1

Cited by 1 publication

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“…On the basis of the difficulties in roadway support and support principles, 23‐29 in view of the large area roof fall disaster of the broken surrounding rock of No. 11103 fully mechanized caving roadway under the double gob, the U‐steel + anchor + prop coupling support structure is used to bear the broken surrounding rock, resist the top pressure, and prevent the U‐shaped steel from appearing weak section under the eccentric load conditions of coal pillar stress concentration and gob stress reduction, which reduces the bearing capacity 30‐37 . “U‐steel + anchor + prop” refers to U‐shaped steel shed, hollow grouting anchor cable and single prop.…”

Section: Surrounding Rock Control Techniquesmentioning

confidence: 99%

Coupling support technique for coal roadway under double gobs in close coal seams

Wu,

Nan,

Chen

et al. 2024

Energy Science & Engineering

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In the process of lower coal roadway support under double gobs in close coal seams, there are problems such as the whole destruction of the lower coal seam and the intermediate strata, the thin roof of the lower coal roadway with the smaller support space, the upper rock of the lower coal roadway without anchor bearing layer, the roof falling, the anchor cable offing, and so on. On the basis of the engineering background of No. 11103 haulage roadway in Fenxi coal mine, the research methods of theoretical modeling analysis, numerical simulation analysis and field engineering test are comprehensively adopted. In this paper, the layout of the roadway with floor insertion in the lower coal seam, the distribution characteristics of surrounding rock deviatoric stress, the control principle of broken surrounding rock and the coupling support method of shed–cable–prop are systematically studied. The study shows that many measures are needed to ensure the stability of the surrounding rock in the strong mining roadway of the lower coal seam. The lower coal seam roadway section was modified from the original rectangular section to adopt an arched section to counteract the broken roof. The staggered position of the lower coal seam roadway layout was modified from the original coal roadway position to a coal–rock roadway, so as to avoid the area of high deviatoric stress in the coal pillar and the area of crushed coal body, and to leave an effective support space for the roof. The support scheme of the lower coal seam roadway was improved to use anchor cable and single prop to support the weak section of U‐type steel shed with local coupling, and realize unequal force coupling by adjusting the size of the force at different coupling points. In the field monitoring the deformation of the roadway is small, and the support effect is good.

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Section: Surrounding Rock Control Techniquesmentioning

confidence: 99%