The structure and activity laws of interlayer equivalent basic roof in multi-seam mining
XIE Shengrong
PAN Hao
CHEN Dongdong
GAO Mingming
HE Shangsen
SONG Baohua
Abstract：In view of the special conditions of 19 m medium grained sandstone in the interlayer coal seam during the multi-seam descending mining in Jinhuagong coal mine,the structural characteristics of the overlying strata were analyzed and the whole structure model of the surrounding rock about multi-seam mining was established.The interlayer equivalent basic roof was proposed.The overburden load of the interlayer equivalent basic roof and the equivalent thickness were discussed by theoretical analysis.The results show that from the angle of stability about the voussoir beam structure,the occlusal contact is the boundary of the equivalent basic roof.The undamaged area in the middle lower part of the thick basic roof is the main bearing area of the voussoir beam structure where the thickness is the basic roof equivalent thickness.The breaking interval of the interlayer equivalent basic roof is 19.1 m consistent with the field monitoring,which is better to explain why the periodic weighting interval becomes smaller when the 19 m medium grained sandstone as the basic roof during the NO.11 coal seam mining.
Keywords：whole structure modelinterlayer equivalent basic roofoverburden loadbreaking interval
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1218-1225 )