## 5 Conclusions  
The following conclusions are drawn from this study:  
* A calculation procedure has been developed to analyse pipes buried under haulage roads bearing a surface pressure of 1250 kPa using the finite element method and taking into account the residual lateral pressure due to the compaction of the fill. The model has been validated with experimental data. Likewise, a sensitivity analysis has been carried out to evaluate the following variables: model length, mesh size, contact and residual lateral load. * A parametric study has been carried out with 108 models, varying the diameter of the pipe, the width and height of the trench, the height of the pipe bed and the type of lateral filling. The trend in the behaviour of the forces acting on the pipe when the selected variables are modified has been estimated. The results indicate that the most influential variables on the pipe deflection and stress are the height of the backfill and the elasticity modulus of the lateral fill. * Changing the top fill height (H) from 3 m to 1 m increases stresses by approximately 60%. Likewise, changing the side fill material (EM) from 60,000 kPa to 30,000 kPa increases stresses by approximately 11%. * Pipe bedding height (C) does not significantly affect stresses under mining truck loads. This variable is more important during the construction stage, where the higher the bed height (C) in the first installation stage, the better the pipe is supported, reducing initial deflections. * The width of the trench does not significantly affect the stresses on the pipe. However, when the width increases, the results show that the stresses increase. Likewise, it is observed that if the width of the tire print is smaller than the pipe diameter, the efforts tend to increase; on the contrary, if the width of the tire print is greater than the pipe diameter, the efforts tend to be reduced. * The variables that most influence installation costs are the height and width of the trench, along with the quality of the filling materials. The greater the trench height, the lower the stresses that the pipe bears, but on the other hand the excavation costs are higher. Likewise, the better the material quality with respect to the elasticity modulus, the lower the stresses that the pipe bears, but in the same way it increases the costs of the installation. Lastly, a reduction in the trench width implies both a reduction in stress on the pipe and a reduction in installation costs. **Author Contributions:** Conceptualization, J.J.J.d.C.F. ; methodology, J.J.J.d.C.F. and N.S.V. ; validation, J.J.J.d.C.F., A.M.G.-A. and N.S.V. ; formal analysis, N.S.V. and A.M.G.-A. ; resources, J.J.J.d.C.F. and A.M.G.-A. and writing--review and editing, N.S.V. and A.M.G.-A. All authors have read and agreed to the published version of the manuscript. **Funding:** This research received no external funding. **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. **Data Availability Statement:** The data presented in this study are available on request from the corresponding author. The data are not publicly available due to privacy. **Conflicts of Interest:** The authors declare no conflict of interest. **Nomenclature**