METHOD FOR DETERMINING EARTH SURFACE INTERPENETRATED CRACK DISTRIBUTION AND AIR LEAKAGE CHARACTERISTICS IN SHALLOW BURIAL COAL MINING

摘要

A method for determining earth surface interpenetrated crack distribution and air leakage characteristics in shallow burial coal mining. The method comprises the following steps: determining the similar experimental material ratio according to actual stratum data of a mine; laying a similar material model according to the geometric similarity and the power similarity; conducting coal bed excavation after the material strength and the raw rock strength are similar, and taking fracture development pictures after the model excavation is stable; conducting graying and vectorizing on the pictures by means of image processing software; importing the vectorized fracture images to numerical simulation software, and conducting calculation; and comparing the obtained result with measured data, and obtaining an accurate numerical model by means of continuous modification. By means of the method, the overlaying strata fracture distribution and air leakage characteristics under the shallow burial coal bed condition can be disclosed, and the beneficial reference is provided for the on-site situations such as the blockage of air leakage passageways.