# Study on Seepage Effect of Roadway Based on Polyformaldehyde(POM) Fiber Concrete
## 5 Conclusions  
This study investigated the enhancement of concrete impermeability using polyformaldehyde (POM) fibers for enhanced underground road stability and durability in seepage-condition underground road environments. The contribution of this study is in employing polyformaldehyde fiber concrete for enhanced road stability and seepage resistance in underground mining environments under the seepage of groundwater, an under-researched issue in mining engineering. In comparison to other conventional fibers, polyformaldehyde fibers have a great tensile capacity, alkalinity, and water-spreading capability, which have a great potential for concrete in resisting the seepage of water. The following key results were attained:  
1. Polyformaldehyde Fiber Concrete Improves Impermeability: The results of the test showed that a small amount of POM fibers can significantly enhance concrete impermeability. The best result was achieved when using a content amount of 5 kg/m\({}^{3}\) of fibers of a size of 30 mm, which reached a hydrostatic stress of 0.8 MPa, which was higher than that of the blank control group. 2. Favorable Length and Fiber Content: The test results showed that the 30 mm fibers of a 5 kg/m\({}^{3}\) content had the shortest seepage height, which yielded maximum impermeability. A fiber content amount of more than 7 kg/m\({}^{3}\) showed a drop in impermeability due to a lack of fiber dispersion and an increase in porosity. 3. Numerical Simulation Calibration: FLAC3D numerical simulation confirmed that polyformaldehyde fiber concrete improves road stability by reducing displacement under seepage. The polyformaldehyde fiber blend showed improved resistivity compared to normal concrete support systems. 4. Effect on Roadway Stability due to Groundwater seepage: In seepage, there was a minimal road displacement of polyformaldehyde fiber concrete, which was 30.5 mm  
Figure 16: Displacement of the roadway’s surrounding rock under a polyformaldehyde fiber concrete support, with displacement values in meters (m) as indicated by the color scale on the left. lower, and improved pore water pressure resistance, which showed its potential in roadway stability in groundwater-saturated environments. * The best content amount of polyformaldehyde fibers for concrete is 5 kg/m\({}^{3}\). This content level is a balance between realizing improved impermeability and maintaining an effective dispersion of fibers in a concrete matrix. Adding a higher content of fibers results in lower performance due to the aggregation of fibers and increased porosity. In conclusion, the use of polyformaldehyde fibers in concrete presents a promising solution for improving the impermeability and stability of underground roadways, especially in mining environments where groundwater seepage is a significant concern. This research contributes to the advancement of concrete technology, offering valuable insights into the application of polyformaldehyde fibers for durable, water-resistant construction materials. Overall, polyformaldehyde fibers' application in concrete is a viable alternative to improving stability as well as impermeability in underground roads, especially in mining regions with high groundwater seepage. The research contributes towards improving concrete technology by giving thoughtful insights into polyformaldehyde fibers' application in manufacturing water-resistant construction materials that are durable. The research is innovative because it examines polyformaldehyde fibers as a specialized application in improving stability as well as impermeability in underground mining regions, which is a research field that has not been extensively researched. Investigation, Y.S. and G.W. ; Resources, G.W. All authors have read and agreed to the published version of the manuscript.