Research And Practice On Compound Mining Technique Under Operation Railway Bridge

According to now mines horizontal production TIEFA coal industry group company's DAMINGmine 1 to receive, extend tense needs and first demonstration , this thesis put forward and implementthis well field river Wang railway bridge pick technical scheme again, under the prerequisite thatmaintains railway normal operation , 201.9kt return safely to pick bridge, produce per day 5313t inaverage , is highest to produce 8514 t per day , have realized the efficient goal of high yield , haveguaranteed that it is normal that pit production receive to extend , have gotten good effect in technicaleconomic aspect , take off the efficiency of high yield for the railway bridge thing of and other placesmine safely to open up technical channel, and have accumulated natural object to take off mineexperience. Subject study with Wang river 4-2 coal seam under the railway bridge after exploiting,quantity of bridge examine and state analysis for the starting point before 16-1 coal seam exploit, set upthe pattern and move the analysis result that influences out of shape to the earth's surface as the basis forthe first time with workface under the bridge, regard exploiting the earth's surface and sinking intocurve characteristic and stress nature , corresponding relation of the size as guidance, construct fromWang river railway bridge reality of the border set out , optimize the size of workface in the pit in thepit, cut 16-1 coal seam working range eyes move 50m to railway down direction of bridge, is it is it is itmove pieces of draw , low value stress that compress of basin in the horizontal sector to sink into onsecond mining to put 88m long bridge to take the lead in, make second mining derive the earth's surfacestress move to bridge out of shape to influence relatively little , with less bridge maintenance actions,ensure the working state of the bridge to play the key effect.. Under river Wang railway bridge sinceon July 25,2003, mining 16-1 coal seam since, the goods train and guest of mining area have keptalways to go to and back from normal pass. By instrumentation this bridge biggest sink 1323 mm,biggest sink speed the / of 43.66 mm day, biggest incline 9.4 mm/m; Bridge compressed amount is of35 mm. Through the enforcement of this project, for enterprise creation the 22.2 million Yuan ofeconomic benefits.KEYWORDS...