Abstract: In order to achieve gob-side entry retaining with flexible filling body (filling gangue) under condition of hard and direct roof, uniaxial compression characteristics of sacked gangue body are gained by experiment, combined with the establishment of lateral overlying strata’s constructional model alongside gob side entry retaining, static load caused by overlying strata movement is quantitatively calculated. Dynamic effect of constructional model of roof is studied by means of dynamics, and dynamic load is quantitatively calculated. Thus, when filling width is designed as 2 meters, static load of filling body is 816 kN/m, and dynamic load is 257.3 kN/m with limestone’s fracture near the coal wall. Supporting demand of static load and dynamic load are satisfied by flexible filling body.

Key words: gob side entry retaining, hard roof, flexible filling, dynamic load, experiment