Gob Floor Heave Characteristics And The Classification Measures Of Prevention And Control Under Deep Different Lithology Of Roof And Floor

With the increasing of coal mining in deep,the roadway surrounding of gob-side entry retaining deformed severely,particularly the large deformation of the roadway floor,which lead to hard governance,has seriously affected the stability of Gob.Studied and researched the floor heave of gob-side entry retaining under different lithology of roof and floor by means of theoretical analysis,numerical simulations,field industry test in this paper,offered theoretical foundation for gob-side entry retaining floor heave controlling under different conditions of the roof and floor.According to geological conditions of Guqiao Mine 1115(1)face,establish the mechanical model of floor of god-side entry retaining by using the knowledge of mechanics,and obtains the calculation formula of floor heave.In the four conditions of hard roof and hard floor,hard roof and soft floor,soft roof and soft floor,soft roof and hard floor,research the variation characteristics of the floor heave of god-side entry retaining with the change of roadway depth,filling belt width,the roadway width and mining height,meanwhile,analyse the main factors affecting floor heave.Based on the above research results,the paper put forward classification measures which prevent and control floor heave under different lithology of roof and floor.Theoretical results will be applied to the engineering practice,through the comprehensive management of the roof and floor,observe the displacement of floor.The field data shows that,the measures for different lithology of roof and floor control and prevent floor heave effectively,and achieve a good effect.