路桥衔接段桩基参数的敏感性分析

Sensitivity Analysis of Pile Foundation Parameters of Road-bridge Connecting Section

桥头跳车已经成为目前非常普遍的道路危害。特别是东部沿海地区,软土分布广泛,桥台台背回填处会引发沉降突变。以往采取的加固措施更多的是解决表层不均匀沉降,注重控制绝对沉降,而忽视了衔接段到一般路段的平稳过渡,采用有限差分软件FLAC研究了路桥衔接段复合地基桩基加固的效果,得到了桩长、桩间距等桩基参数对路基水平位移、沉降、不均匀沉降、桩侧摩阻力和桩土应力比的敏感性,为路桥衔接段的桩基设计提供一定的依据和参考。

Vehicle bumping at bridge-head has become a common road damage at present,and especially in the east coastal areas,soft soil will result in sudden settlement of backfilling section of abutment.The former strengthening measures are focusing on surface uneven settlement and absolute settlement and ignoring the smooth transition from connecting section to normal road.And Fast Lagrangian Analysis of Continua (FLAC) can research the complex pile foundation strengthening effect and obtain the sensitivities of pile length and pile spacing to subgrade horizontal displacement,settlement,uneven settlement frictional resistance on pile side and pile soil stress ratio,which provide reference for the pile foundation design of road-bridge connecting section.