doi:10.16186/j.cnki.1673-9787.2022010024

Received:2022-01-08

Revised:2022-05-23

Online Date: 2023-04-13

Study on surrounding rock stability of partially filled mining face underthe influence of filling stiffness and filling step（Online）

JI Yuxin, LI Hehe, SONG Gaofeng

School of Civil Engineering，North China University of Technology，Beijing 100144，China

Abstract:In order to further study the movement law of roof and overburden in partial backfill mining technology ，the equation is developed using the elastic foundation beam theory to reveal the relationship between the filling elastic foundation coefficient as well as the direct roof elastic modulus and the roof subsid- ence，a numerical model is developed using the Phase 2D，which studys and analyzes the overburden movement under different backfill stiffness and different backfill steps.The results show that the final subsidence of the direct roof decreases with the increase of the elastic foundation coefficient of the filling body； with the increase of roof elastic modulus，the direct roof subsidence in the working face decreases gradually， while the direct roof subsidence in the filling area does not change much. With the increase of filling body stiffness and backfill steps，the plastic zone in front of the longwall face，the deflection of direct roof in the working area and the vertical displacement of overburden above the longwall face all decrease accordingly， and in the influence of filling step on the stability of surrounding rock，the height width ratio is more significant than timely support.

Key words:partial backfill;backfill steps;filling body stiffness;direct roof subsidence;surrounding rock stability

CLC：TD322;TD823