高速铁路桩承式结构路基地基沉降计算方法

采用Mindlin-Boussinesq联合求解桩间土的附加应力,再根据e-lgp曲线法(e为孔隙比,p为土体压力)计算地基沉降的方法对高速铁路两种刚性桩桩承式结构地基进行了沉降计算,并与现行计算方法及现场实测数据进行对比分析.分析表明:现有规范计算方法对高速铁路路基荷载作用下刚性桩桩承式结构,及超固结或结构性较强的地基土体沉降计算有局限性;Mindlin-Boussinesq联合求解刚性桩桩承式结构地基中桩间土的附加应力沿深度的分布规律符合实际工程分布情况;Mindlin-Boussinesq联合求解附加应力并根据e-lgp曲线法计算地基沉降的方法的计算沉降值与实测值较为接近,并能考虑刚性桩复合结构地基设置参数情况及地基土应力历史等影响因素.

Analysis on Settlement Calculation of Rigid Piled-structure Embankment in High-speed Railway

The Mindlin Boussinesq uniting solution is used to calculate the additional stress, and the settlement is calculated with the method of e lgp curve. And then, the calculation results are analyzed comprehensively by comparing with the existing calculation methods and the in situ measurement data. The research results show that the limitation exists in the settlement calculation of rigid piled structure embankment under embankment loads and over consolidated or strong structural soil by the method of existing code. The Mindlin Boussinesq uniting solution is used to calculate the additional stress of soil between piles in rigid piled structure embankment. The distribution along depth can accord with the actual engineering situation; and the settlement calculated by method of e lgp curve is relatively close to in situ measurement data, which can take the parameters of the rigid piled structure embankment and stress history of foundation soil into consideration.