Structure model and movement law of overburden during strip pillar mining backfill with cream-body
Abstract：Space-time structure model and movement law of overburden were researched during strip pillar mining backfill with cream-body,taking 2351 backfilling face for an example.The results show that as the face advances,overburden strata are gradually transformed from the ＂C＂ type space structure into articulated rock beam with unequal height supports.The immediate roof of working face is the main roof;the first weighting interval is 33.6 m,and the periodic weighting length respectively are 18.3,8.8,13.7 and 9.0 m for the last four times.The overburden gravity mainly acted on coal wall in front of face and backfill paste,which had little effect on roof advance stress,and the influence scope is less than 15 m.In current technology conditions of face 2351,the reasonably maximal roof control distance is 8.8 m,the reasonable working resistance of support backfilling is 27 MPa,and the support setting load is 21 MPa.
Keywords：strip pillarbackfill miningoverburden strata movementstructure modelcrackingroof weighting step
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)