The Study of Distribution of Spontaneous Combustion "Three-Zone" in Gob Using the Law of the Roof Caving
Yali Wang · Caikuang yu anquan gongcheng xuebao · 2010
In view of the present situation that the intensity of the shallow coal seam overburden strata falls is much bigger,the roof destructiveness is serious,we analyze relationship between roof caving law and spontaneous combustion in goaf.We study the law of the shallow coal seam working face roof caving using similar simulation experiments,and arrange measuring points in goaf for testing gas sample to analyze the distribution rule of gob's gas density in the advancement process.The result shows that the working face gob from 0 to 120 m is natural accumulation area,from 120 m to 260 m is crushing accumulation area,and the oxygen concentration of gob is 18%~10%,in the distance to working face from 140 m to 260 m.The rule of the three-zone of spontaneous combustion in goaf using the above two methods has the very good uniformity,validating the accuracy of studying results.The studying result has provided the reliable basis for establishing against the fire fighting measure in the gob of working face.