Study on Mine Strata Behavior Law of Combined Mining in Ultra Contiguous Seams
JI Ping
ZHA Wen-hua
SONG Xin-long
Abstract：In order to obtain mine strata behavior law of combined mining face in ultra contiguous seams under different coal mining tech-niques,the site measuring method was applied to mine strata pressure observation on a coal mining face in seams with a displaced distance of 20 m between the upper seam and the lower seam.The observation results showed that due to the upper seam had a low mining height and a hard roof,which led to there was no obvious primary roof weighting and no periodical roof weighting,an advance influence serious scope of the roof weighting was 20 m in front of the coal mining face and a depth of the plastic zone in the gateway of the coal mining face was 1.5~2.0 m.A primary roof weighting and average periodical roof weighting of the coal mining face in the lower seam was 27.4 m and 15.5 m in step individually,an advance influence serious scope of the roof weighting was 30 m in front of the coal mining face and a depth of the plastic zone in the gateway of the coal mining face was 2 m.Thus under above conditions,a displaced distance of 20 m was irrational.
Keywords：ultra contiguous seamscoal mining techniquescombined miningoverburden strata movementmine strata behavior
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( 8-11,15 )