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通过离心模型试验和数值分析两种手段,研究了软土低路堤下小型构筑物底部软土采用水泥搅拌桩复合地基和天然地基两种工况下路基的纵向差异沉降变化情况。由试验和数值分析结果得出结论:在低路堤路段下,小型构筑物底部采用水泥搅拌桩复合地基会提高路基承载力,加大软土构筑物与其两侧路基之间的纵向差异沉降量;天然地基下小型构筑物可与一般路基协调沉降。建议在低路堤荷载下,考虑取消小型构筑物下方软基加固处理,从而减小路基纵向差异沉降,提高路面行车舒适度。
Centrifuge model test and numerical analysis are used to study the longitudinal subsidence and subsidence of subgrade under the condition of cement mixing piles composite foundation and natural foundation under the soft soil low embankment. Based on the test and numerical analysis, it is concluded that under the low embankment section, the cement-mixed piles composite foundation at the bottom of small structures will increase the bearing capacity of the embankment and increase the longitudinal differential settlement between the soft soil structures and the roadbed on both sides. Under the small structures can be coordinated settlement with the general subgrade. It is suggested that under the low embankment load, the soft foundation reinforcement under the small structures should be canceled, so as to reduce the differential settlement in the longitudinal direction of the embankment and improve the road traffic comfort.