Mechanisms of Roadside Support and Application of Pier Column in Gob-Side Roadway Retaining

The stability control of roadside filling body is the key to keep the gob-side roadway retaining. According to the mechanical model of gob-side roadway retaining overlying strata, the paper analyzed the movement laws of main roof, especially the deformation process of key block B in the two stages. Based on this, we proposed and used the pier column supporting body as roadside support in the gob-side roadway retaining. We built a numerical model by using FLAC3D to analysis the supporting effect of pier column. All the above research results are applied in the tailway of W1305 working panel in Gaohe coal mine and have certain guidance to the practice of gob-side roadway retaining in other coal mine.