软土地基桥台后回填固化粉煤灰工后沉降与差异沉降分析

Analysis on Post-construction Settlements and Differential Settlement of Solidified Fly Ash Backfills Adjacent to Abutment on Soft Clay Foundations

通过对桥台后软基路堤实际受力特性进行适当简化处理,提出了有限元分析的简化计算模型。采用ABAQUS有限元程序来模拟路堤填筑与工后变形的实际工况,就桥台后分别填筑固化粉煤灰、粉质粘土桥台后路面工后沉降及搭板与引道路面差异沉降进行了计算。对计算结果进行了分析,并与实际观测结果进行对比。研究结论表明:采用轻质材料固化粉煤灰可减少桥台后路面的工后沉降量及桥台搭板与引道交界处路面的差异沉降,有效降低桥头跳车现象的发生。研究结果可为固化粉煤灰在桥台回填工程中的应用提供理论依据。

A simplified FEM model is proposed after investigation of the mechanical conditions of the backfills adjacent to abutment.The factual construction circumstances of filling and post-construction settlements of the embankment are simulated by the ABAQUS program, and the post-construction settlement and differential settlement between slab and approach under the abutment is separately filled by the solidified fly ash and silt clay are calculated. The calculating results are analyzed and compared with the observed value, the research conclusion indicates that the post-construction settlements and the differential settlement between abutment and embankment can be greatly reduced by using solidified fly ash and decrease effectively the bump on bridge-approach.The research result provides the theory foundation for the solidified fly ash used as the filling of abutment.