Multiple linear analysis of effect factors of inflection point offset
QIN Hongyan1,2， TI Zhengyi3， LI Yang1,3
1.School of Safety Engineering， North China Institute of Science and Technology， Beijing 101601， China；2.Key Lab of Mine Disaster Prevention and Control in Hebei Province， Langfang， Hebei 065201， China；3.School of Mining， Liaoning Technical University， Fuxin， Liaoning 123000， China
Abstract：Based on measured data and using multiple linear analysis， the influence of geology and mining condition on inflection point is studied in depth and the model of regression calculation for inflection point is established. The analysis shows that the main impact factors of inflection point offset including compressive strength of overlying strata， mining extent， dip angle of coal seam， mining depth and the thickness of epipedon， etc. Meanwhile， it is found that the error of the model is relatively large when the thickness of hard formation of overlying strata is more than 10 m. By using multivariable linear regression， the model of calculating inflection point offset is re－established when there is no hard formation more than 10 m thick. The model is demonstrated to have good degree of fitting， stability and accuracy which is able to meet the demand of ground movement and deformation prediction.
2018, Vol. 52 
