Rock burst risk in surrounding abscission layer of overlying high key strata in deep strip mining mines
JIANG Fuxing
WEN Jinglin
BAI Wushuai
WANG Guili
LI Ming
Abstract：In recent years,many rock burst accidents have occurred in strip mining mines.Analysis of accident data demonstrates that in the deep strip mining mines with high key strata,the rock burst occurrence regularly concentrates around the exploited areas.By establishing a key strata abscission layer mechanical model,the correlation between the span limit of key strata and the stope size,as well as the deflection of the key strata and the compression amount of the remnant isolated coal pillars were analyzed.The formation condition of abscission layer and its effect on stress distribution in surrounding areas were discussed.Results show that the remnant isolated coal pillars were compressed under the stress transferred from overlying strata of both gob sides,which formed the stress transferring structure in abscission layer of key strata.This structure transferred the stress of overlying strata to surrounding separation areas which lead to obvious increase of the surrounding stress,and frequent occurrence of the rock burst in these areas.A positive correlation was found between the rock burst risk surrounding the abscission layer of key strata and the span of abscission layer as well as the rock strata thickness above the key strata.This study provides a theoretical basis for rock burst prevention in similar geological conditions.
Keywords：deep minestrip miningkey strataabscission layerrock burststress transfer
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 40-47 )