The invention discloses a gas extraction treatment method for secondary hole forming through a protective layer goaf, which comprises the following steps of: firstly, constructing a first-stage
drill hole from a current
coal seam to the protective layer goaf, injecting filling
colloid into the protective layer goaf through the first-stage
drill hole after the first-stage
drill hole is completed, and after the filling
colloid and broken rock
mass in the goaf are cemented and solidified, injecting the filling
colloid into the protective layer goaf; forming a
coal rock cementitious body for connecting the goaf top and bottom plates; construction continues to be conducted along the first-stage
drill hole, the
drill hole extends into the roof rock stratum through the
coal rock cementitious body until the
fissure zone is reached, and second-stage drilling is completed; and finally, a gas extraction
pipe is arranged in the
drill hole to perform gas extraction on the
fissure zone, by forming a coal rock cementitious body in the protective layer goaf and combining a two-stage secondary hole forming mode, gas extraction is performed on the upper
fissure zone by penetrating through the goaf from the current coal seam, and the goaf does not interfere with gas extraction. Therefore, the effect of gas extraction of the fissure zone is guaranteed, and subsequent safe mining of a coal seam is facilitated.