Control Technology of Soft Rock Floor Heave in Deep Mine Seam Gateway

In order to solve the serious floor heave deformation problems of water sump in the mine shaft bottom of Hujiahe Mine ,through the simulation in-door tes t with physical similar material,the high stress of the surrounding rock,poor floor lithology and no support conducted in the floor would be the major factors to cause the serious floor heave in the mine roadway.Based on the plastic ring theory and to improve the floor strength and the completed support structure stability,the comprehensi ve support technology with the bolt/steel mesh/shotretting/lining + reversed floor arch + floor bolt + reinforced bar mesh was applied to control the floor heave deforma tion of the mine roadway.The surface displacement observation results of the mine roadway showed that when the comprehensive support technology applied,the conve rgence between the two sidewalls of the mine roadway was not over 10 mm,the convergence between the roof and floor was not over 12 mm and the floor heave proble m of the water sump in the mine shaft bottom was effectively solved.