塑料排水板与粉喷桩处治软基拓宽路堤数值模拟

Numerical Simulation for Widening Embankments on Soft Ground Improved by Plastic Drainage Plates and DJM Piles

为明确塑料排水板与粉喷桩综合处治软土地基拓宽路堤的效果及其力学机理,以粉喷桩作为过渡区,通过建立三维非线性有限元数值模型,分析了新路堤填筑期间旧路基面竖向位移、新旧路基拼接处地基水平位移和地基超孔隙水压的分布,以及新路基工后新旧路基面的沉降变化,讨论了塑料排水板和粉喷桩综合处治时粉喷桩过渡区范围的适宜值。研究成果可为软土地基拓宽路堤的设计优化提供科学指导。

To further clarify the treatment effect and mechanical mechanism of Plastic Drainage Plates(PDPs)and Dry Jet Mixing(DJM)piles in treating soft soil for widening the embankment of soft ground,a three-dimensional nonlinear finite element numerical model is established,in which the DJM piles are used as the transition zone.The vertical displacement of the old embankment surface,the horizontal displacement of the foundation at the joint of the old and the new subgrades,the distribution of the excess pore water pressure of the foundation during the construction of the new embankment,and the settlement change of the embankment surface after the new embankment completed are analyzed.The suitable value of the transition zone for DJM piles is discussed when the PDPs and DJM piles are used comprehensively.The research results provide scientific guidance for the optimal design for widening embankments on soft ground.