Study on Seepage Effect of Roadway Based on Polyformaldehyde (POM) Fiber Concrete

This article presents the results of a study focused on enhancing the permeability resistance of roadways using polyformaldehyde fiber-reinforced concrete. The uniqueness of this study is its interest in polyformaldehyde fiber, which has not been widely studied in underground mining roadways, especially in relation to its impact on permeability resistance. The permeability resistance of polyformaldehyde fiber-reinforced concrete with different lengths (30 mm, 36 mm, 42 mm) and dosages (5 kg/m3, 7 kg/m3, 9 kg/m3) was tested by the step pressure method and seepage height method. The hydrostatic pressure and seepage height of polyformaldehyde fiber-reinforced concrete were analyzed, and the best polyformaldehyde fiber-reinforced concrete with the best permeability resistance was selected to carry out numerical simulation based on a phosphate mine in Yunnan Province. The changes in the pore water pressure, maximum principal stress, and displacement of the roadway’s surrounding rock under the influence of groundwater seepage were analyzed. The results show that the addition of polyformaldehyde fiber can effectively improve the impermeability of concrete. With the increase in length and dosage, the impermeability of the polyformaldehyde fiber concrete increases first and then decreases. Under ordinary support conditions, the surrounding rock of the roadway is affected by the seepage of groundwater over time, which leads to the roadway strength’s decline and creep deformation, necessitating the strengthening of the roadway’s anti-drainage measures. Under conditions of reinforcement with polyformaldehyde fiber concrete, the displacement of the top of the roadway obviously reduces, which can effectively improve the permeability resistance and stability of the roadway.