Mechanical Model of Roof Rupture Weighting and Its Application in Terminal Mining Stage of Fully Mechanized Caving Face
MA Xiang
LI Jun
XUE Fenquan
ZHANG Xueqi
Abstract：Aiming at the problem of support crushing in the process of support withdrawing at the terminal mining stage of the fully mechanized top-coal caving face, a mechanical model of roof rupture weighting was established, and the unified expression for the stress increment average values in the support body and coal mass in different roof rupture forms was derived according to the equilibrium equations before and after the roof rupture. Taking the multichannel rapid support withdrawing mode used in Shengdong Coal Mining Area as the research object and based on the position relation between the roof rupture surface and the main withdrawing channel, the mechanical analysis in two cases was conducted. The results showed that the reasonable position for support withdrawing and mining termination should enable the main withdrawing channel to be located beyond the roof rupture surface; and during the support withdrawing, the adjustment of the periodical weighting step distance with the mining termination yielding principle, the strengthening of support in the main withdrawing roadway and the control of the height difference of the working face before and after cutting through can effectively ensure the safe withdrawing of face support at the terminal mining stage of the fully mechanized caving face.
Keywords：roof ruptureweightingterminal mining stagecrushing of supportface support withdrawing
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 45-49 )