在建矿井奇台一矿主采B3煤层，厚度约22m ，埋深518～540m。中央辅助运输大巷沿煤层底板掘进。底板属极软岩，遇水易膨胀，出现底鼓现象。巷道掘进后，底板即鼓起，且速度较快，平均底鼓速度达10mm／d ，原采用常规浇筑混凝土底板的办法来加以治理，未获成功。后根据具体情况，在巷道底板中间开挖卸压槽，并采用反底拱支护方式来治理底鼓，效果良好，为软岩巷道底鼓治理提供了新的经验。%In a construction mine of Qitai No.1 mine ,a main mining seam was B3 seam ,a thickness of the seam was about 22m and a depth of the seam was 518~540m. A mine central auxiliary transporta‐tion roadway was headed along the seam floor. The seam floor was an ultra soft rock ,could be easily swelled with water and would cause a floor heave phenomenon.After the mine roadway headed ,the floor would be soon heaved ,the heave speed was fast and an average floor heave speed was 10mm/day. A previous conventional method with a site pouring concrete floor was applied to control the floor heave and the method was not success.Late ,according to the certain condition ,a pressure releasing groove was excavated in the middle of the mine roadway ,a reverse floor arch support method was ap‐plied to control the floor heave and excellent effect was obtained. Thus a new experience was provided to the floor heave control of the mine soft rock roadway.
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