Study on Gob-side Entry Retaining Technology of Bag-casting Concrete with Pre-support
HUI Xingtian
LI Wei
Abstract：To aim at the defect that the separating wall has no strength in the early time of gob-side entry retaining, individual props and H-T anchor columns were arranged along both the inside and outside of the separating wall to form a pre-support contour, and based on the key strata theory of rock control, mechanical models of the surrounding rock structure having different support effect in gob-side entry retaining were established. Analysis was made on the interacting mechanism of the pre-support, the separating wall and the surrounding rock, the gob-side entry retaining technology with the bag-casting concrete and H-T anchor column as pre-support was put forward, and based on the theoretical study, industrial test was carried out on this technology. The results showed that the pre-support can change the fracture location of surrounding rock, reduce the support resistance of the separating wall; the greater the support resistance of the roadway side, the smaller the pre-support resistance required for ensuring the surrounding rock fracturing along the outside of the roadway;the larger the setting load of the pre-support, the faster the load of the side anchors decayed after the winning of the coal face and the smaller the deformation of the roadway side.
Keywords：gob-side entry retainingseparating wallH-T anchor columnkey stratapre-support
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 58-62 )