Research Article

A Coal Burst Mitigation Strategy for Tailgate during Deep Mining of Inclined Longwall Top Coal Caving Panels at Huafeng Coal Mine

Table 1

Major coal bursts that occurred at HCM.

TimeMagnitudeLocationInducementDescriptionContributing factor

Jan 14, 1991,
at 10:00 AM
Tailgate of upper slice of 1405 panel, 80 m from the stopping lineBlasting on the working faceTailgate within 35 m ahead of face closed 60%; sudden floor heave within 35 m of upper faceAbutment load on tailgate pillar and periodic weighting

Mar 08, 1992,
at 9:15 AM
Tailgate of upper slice of 2406 east panel close to the corner of the longwall face (face advanced 13 m)Post withdraw for roof cavingTailgate within 35 m ahead of face closed 70%; 40 m of upper part of working face blew out; floor hove 0.4 m; two miners were severely injuredInfluence of gate pillar and barrier pillar

Mar 19, 1992,
at 10:40 AM
Tailgate of 2406 east panel upper slice close to the corner of the longwall face (face advanced 20 m)Post withdraw for roof cavingFloor hove 0.2 m in tailgateSuperposition of first weighting and gate pillar abutment load

Apr 20, 1992,
at 2:45 AM
Headgate of middle slice of 1405 east panel, 55 m from the stopping linePost withdraw for roof cavingFloor hove 0.8 m; one miner was killedSuperposition of abutment load on barrier pillar and front abutment load

Dec 10, 1992,
at 9:10 AM
1.9Lower end of lower slice of 2406 east panel (face advanced 8 m)Weighting from immediate roofA loud sound; support toppled down; one miner was killedAbutment load on gateroad pillar and cave-in of immediate roof

Oct 2, 1993,
at 7:15 PM
2.596–105 m of lower end of 2405 panelPeriodic weightingRoof sagged 150 mm; floor hove 200 mm; 5 props toppled downPeriodic weighting

Feb 23, 1995,
at 00:20 AM
2.1Upper end of 1407 panelBlasting on the face130 supports were damaged; the longwall idled for two shifts; one miner was injuredFirst weighting

Apri 3, 1995,
at 9:13 PM
1.9Headgate of 1407 panelBlasting50 m of rib was damaged; 8 supports were brokenPeriodic weighting

Apri 3, 1996,
at 8:42 AM
2.9Tailgate of 1407 panelBlasting100 m of the tailgate was damaged; the longwall was idled for 3 days; 10 miners were severely injured; one miner was slightly injuredAbutment load on tailgate pillar and massive conglomerate strata movement

Jun 17, 1996,
at 3:40 AM
2Face of 2407 panelBlasting10 m of rib was damaged; 10 supports were twisted or broken; floor hove 300 mmMassive conglomerate strata movement, tectonic stress and abutment load on tailgate pillar

Jun 28, 1996,
at 8:46 AM
1.72407 tailgateBlasting5 m of rib was damagedAbutment load on tailgate pillar

May 10, 20001.6Upper corner of face of 3406 panelBlasting1 miner was severely injured; 12 props were distorted; roof fellAbutment load on tailgate pillar

Jul 5, 20011.7Face of 3407 panel advanced 83 mBlasting1 miner was killed; 13 were injured; gateroad was closed completely; 53 props were brokenStress concentration resulting from strata movement

Jun 29, 20022.9Face of 1409 panel advanced 197 mCoal cuttingFloor hove within crosscut to the tailgate entryGate pillar instabilities and conglomerate strata movement

Aug 16, 20062Development face of 1410 tailgateCoal cutting30 m of the tailgate was seriously deformed with roof sagging up to 1.5 m; header and stage loader were raised 0.5 m; tail of belt conveyor was twisted; stage loader was off the railSide abutment load

Sep 9, 20062Working heading of the tailgate of 1410 panelCoal cutting71 m of the tailgate was destroyed with 1.4–2.5 m roof-to-floor convergence and 1.0–2.3 m rib-to-rib convergence; two miners were killed; two were severely injured; energy released was  JConglomerate strata movement caused stress concentration on pillar and surrounding rock mass; fault