To obtain the optimal load-reduction scheme and calculation method of earth pressure on the crown of the pipe. the load-reduction efficiency of rigid pipe and flexible pipe with different thicknesses and layers of expanded polystyrene (EPS) is investigated by model tests. and the law of load reduction is obtained by analyzing the earth pressure and the displacements of the filling aro... https://parisnaturalfoodes.shop/product-category/prem-iron-free/