桩承式格梁路堤荷载传递机制与变形特性分析OACHSSCD

Traditional pile-supported embankments often face problems such as lateral displacement,differential settlement and instability.The pile-supported grid beam embankment improves overall structural integrity through rigid grid beams atop the piles,yet its load transfer and deformation behav-ior require further investigation.In this study,three-dimensional trapdoor tests were conducted on grid beam embankments to clarify the evolution of the soil arching effect,the deformation characteristics of the fill,and the stress-strain behavior of the geotextile.The results indicate that:(1)the load transfer mechanism of unreinforced pile-supported grid beam embankments is primarily governed by the soil arching effect,whereas reinforced grid beam embankments experience three stages:an initial stage dominated by soil arching,a middle stage where soil arching and tensile membrane effects are coupled,a final stage dominated by the tensile membrane effect.(2)Increasing the fill height or grid beam replacement ratio significantly enhances the stability and magnitude of the soil arching effect.(3)Although reinforcement effectively controls embankment settlement and improves overall load-bearing efficiency,its constraint on differential settlement can,to some extent,inhibit the full devel-opment of the soil arching effect.