Study on Composite Wall Support Technology Applied to Gob-side Entry Retaining
LI Shu-xia
JIANG Fu-xing
ZHU Quan-jie
Abstract：In order to solve a large deformation of mine gateway and mine strata pressure bump caused by the overhigh advance support pressure of the gateway retained along the goaf in a deep coal mining face,a composite wall roadside support technology was provided based on a sectional and stage loading principle.The composite wall mainly was a coal refuse brick wall as the main wall mass and an inorganic backfill material Ruimi No.3 as auxiliary wall mass.With a dynamics analysis conducted on a roof of the gateway retained along the goaf, the roof subsidence value and the wall support strength were calculated.The lab experiment showed that the support strength of the coal re-fuse brick was 10.4 MPa and could fully meet the roof pressure born by the wall mass.The designed height of the auxiliary wall mass was 0.4 m,could meet the requirement of the yield pressure and could ensure the support role of the main wall mass.The results showed that the composite wall support technology could effectively control the deformation of the gateway,could prevent the mine strata pressure bump ac-cident occurred,could solve overhigh advance support pressure of the gateway retained along the goaf in the coal mining face and could solve the environment pollution problems by the coal refuse.
Keywords：gob-side entry retainingsectional and stage loading principlecoal refuse wallgateway sidewall support
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 32-36 )