Surrounding Rock Stability and Control Technology of Expanded Roadway in “Three-soft” Thick Top Coal Mining Roadway

The construction process of gob-side entry retaining in 12209 Zhaojiazhai Mine includes “expanding lane and filling”. Calculated by theoretical analysis, the size of the filling wall is determined as 2.2 m, and FLAC^3D software is used to simulate the displacement of roadway and the distribution of surrounding plastic zone of 2.5 m, 3.0 m, 3.5 m and 4 m. It is determined that the size of 12209 lower lane is 3.5 m. Four kinds of support schemes after road expansion are proposed, and the “anchor + anchor cable + hydraulic lifting shed” is determined as the best solution, and successfully applied on site.