Study On Broken Depth Of Damage Floor

Based on reading a wide range of relevant references at home and abroad, summed up the formulas of broken floor depth. Describe the effect of floor damage to broken floor depth. This paper analyses the stress states of the coalbed floor and have made great achievement. Based on the crack initiation criterion of damaged rock and underground pressure control theory, derived broken floor depth formulas under two states of stress-damage couping and flow-stress-damage coupled, gived two calculate methods of damage variable that are based on rock mechanics testing parameters and damage index of damage floor. Calculate the depth of 51302 workface in Liangzhuang, Xinwen coalbed and 7105 workface in Baizhuang, Feicheng coalbed by derived broken floor depth formulas. Regard 51302 workface floor as no damaged, damaged and damaged with flow and simulated broken floor depth by RFPA software. The simulated result is closed to the result by derived broken floor depth formulas. Realtime monitoring broken floor depth of 51302 workface and 7105 workface, Further verify the theoretical calculation can be applied. Find out the main factors to impact depth of destroyed floor, built forecast model by BP neural networks that use Matlab software. Forecast model is used in 51302 and 7105 workface and got results.Find out got results closer to reality than calculate results through comparing them. Based on the theory of milti-source information fusion, fused the depth results calculated by variety of broken floor depth methods, improve the prediction accuracy of the results. Take it used in Feicheng coalbed.