Study on design method of roadside filling-wall parameters based on multi-index test

In order to study the influence of the strength and width of the filling-wall on the deformation of the roadway and determine the reasonable filling parameters next to the roadway ， the model of the filling-wall bearing structure was established.Based on multi-index analysis test，the four levels of the two factors strength and width of the filling wall were accurately analyzed by comprehensive test design about the significance of the filling-wall horizontal displacement H，roof subsidence J，coal side horizontal displacement K，floor heave L of the gob-side entry.The study showed that the two factors of strength and width must be considered when roadside filling parameters were designed； the factors of strength and width had significant influence on the index H and L but very slight influence on the indexes J and K，main indexes H and L were seized， reference index J and K were considered， the interaction of strength and width was considered， the optimum combination of filling wall strength was 10 MPa and width was 2 m in No.3107 working face of Xinyuan Coal Mine.The research results were applied in the No.3107 working face and remarkable control effect of the surrounding rock was achieved.