搭板联合长短桩加筋处治路桥过渡段沉降研究

Study on Settlement of Transition Section of Road and Bridge with Slab and Long and Short Pile Reinforcement Technology

为研究荷载作用下路桥过渡段搭板联合长短桩加筋路基的沉降响应,利用FLAC3D软件建立了路桥过渡段搭板联合长短桩加筋路基的三维模型,对比分析了搭板联合等长桩、直线型长短桩、阶梯型长短桩和长短桩加筋路基对处治路桥连接段差异沉降的效果。结果表明:搭板可以避免过渡段发生错台,但会导致发生二次跳车;搭板联合长短桩可显著减小路面差异沉降,处治后路面的沉降量曲线和纵坡曲线变化都更平稳;搭板联合长短桩加筋路基,随着与桥头结构距离的增加,道路整体纵坡的波动程度较搭板联合桩基更小,沉降变化更平缓,道路更加平顺,行车更舒适安全。

In order to study the settlement response of subgrade reinforced by approach slab and long and short piles in transition section of road and bridge under load,a three-dimensional model of subgrade reinforced by approach slab combined with long and short piles in transition section of road and bridge was established by FLAC3d software,and the effects of different settlement of road bridge connection section were compared and analyzed.The results show that the setting of approach slab can avoid the dislocation of the transition section,but it will lead to secondary vehicle jumping.The combined pile foundation of approach slab can significantly reduce the differential settlement of pavement,and the change of settlement curve and longitudinal slope curve of long and short piles are more stable.With the increase of the distance from the bridge head structure,the fluctuation degree of the overall longitudinal slope of the road is smaller than that of the combined slab pile foundation,and the settlement changes more gently,that is,the road is smoother,and the driving is more comfortable and safe.