Application of pile-net structure-based filter concrete slope protection in soft soil subgrade by the river
ZHANG Hao
Abstract：To address the issues of settlement control,slope stability,and ecological protection during the construction of highways on soft soil foundations adjacent to rivers,based on the actual engineering case of the sixth section of the Tianjin-Shijiazhuang Expressway,a pile-net-filtering collaborative theoretical model is established.The model employs a pile-net structure formed by prestressed high-strength concrete(PHC)piles and reinforced cushion layers,combined with a new scheme for filtering concrete slopes,and is compared with traditional methods.The research results indicate that the new scheme effectively improves the bearing capacity of the foundation and the stability of the subgrade,with post-construction settlement not exceeding 52 mum(37％less than traditional methods)and differential settlement less than 2.0 mm/m;the filtering slope reduces pore water pressure by 55.6％,and the safety factor increases by 14.4％compared to traditional slope protection schemes;the life-cycle cost is reduced by 19.6％,construction time is shortened by 66.7％,carbon emissions are decreased by 27.6％,suspended particulate matter emissions are reduced by 78.2％,and the pH value returns to neutral(7.6).This scheme effectively resolves the three major conflicts of bearing capacity-settlement,water flow-soil interaction,and construction window limitations,providing an efficient,stable,and environmentally friendly solution for similar soft soil foundation projects adjacent to rivers.
Keywords：pile-net structurefilter concrete slope protectionpipe pilesoft soil subgrade by the river
Publication Date：2025-11-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 70-77 )