Division of “Three-Zones” in Goaf with High Gas Content Under Nitrogen Jnjection

For the problem that the method of “three zones” in high-gas goaf has not taken into account the disturbance of nitrogen gas and gas volume fraction, and nitrogen and gas disturbance coefficient is proposed. Using the method of analogy, we define the concept of oxidation loss value of oxygen volume fraction and obtain that the oxidation zone moves to deep goaf under the double impact of nitrogen and gas, and the oxidation zone width decreases. The three zones of N3042 working face are divided by the correction method based on temperature, the results are in good agreement.