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将桩承式加筋路堤技术应用于中低压缩性土地区高速铁路桥台和涵洞之间填方路基的处理,通过逐渐改变CFG桩桩长形成刚度均匀变化的地基加固区,严格控制线路纵向差异沉降。通过现场试验对桥台、涵顶和路基中心地基沉降进行了长期观测,同时对桩承式加筋路堤桩间土沉降、孔隙水压力、格栅上下表面土压力和格栅变形进行了长期监测分析。研究结果表明:桩承式加筋路堤可有效减小中低压缩性土地基沉降,总沉降小且很快趋于稳定;桩承式加筋路堤通过土拱效应和张拉膜效应将路堤荷载向桩帽传递,格栅下桩土应力比明显高于格栅上,张拉膜效应明显,格栅上桩土应力比接近1.0,土拱效应较弱;格栅在路肩处发挥的作用强于线路中心处。
The technology of pile-supported reinforced embankment is applied to the treatment of filled embankment between abutments and culverts of high-speed railway in medium-low compressive soil area. By gradually changing the pile length of CFG pile to form the foundation reinforcement zone with uniform stiffness variation, Differential settlement. The long-term observation of abutment settlement, culvert roof and embankment subsoil center settlement are carried out by on-the-spot test. At the same time, long-term monitoring of soil settlement, pore water pressure, soil pressure on the upper and lower surfaces of grille and deformation of grille are carried out. analysis. The results show that the pile-supported stiffened embankment can effectively reduce the settlement of the medium-low compressibility soil foundation, the total settlement is small and quickly tends to be stable. The pile-supported stiffened embankment will embankment load The stress of pile-soil under the grid is obviously higher than that of the grid. The effect of the tension membrane is obvious. The stress ratio of the pile-soil on the grid is close to 1.0, and the soil arching effect is weak. The grid plays a strong role in the shoulder At the line center.