天津滨海新区典型软土地基强夯法有限元分析

针对中国天津滨海新区典型软土地基强夯法适用效果进行了有限元分析。采用有限元计算分析软件ABAQUS的显式分析模块，建立夯锤对土体冲击作用分析模型，计算分析获得冲击过程地基表面的接触力时程，将其作为强夯数值模拟的荷载输入模型，运用有限差分软件FLAC3D对天津滨海新区典型软土地基土体进行了单点多次夯击分析。结果表明：随着夯击次数的增加，单点夯击沉降量不断减小而累计夯击沉降量逐渐增大，8次夯击后累计夯击沉降量趋于一个稳定值；强夯作用后土体的孔隙水压和土体竖向应力呈半球状分布，在埋深方向上先增大后减小，在埋深5m处孔隙水压和竖向应力已很小，单点多次夯击最有效影响埋深大致在5m范围内；该研究结论对相关的强夯工程具有一定的参考价值。

Finite Element Analysis of Dynamic Consolidation Method on Typical Soft-soil Foundation in Tianjin Binhai New Area

Authors numerically analyzed the effect of a dynamic consolidation method on a typical soft-soil foundation in Tianjin Binhai New Area, China. Firstly, finite element analysis softwareABAQUS was used to establish an impact model of a rammer on soils obtaining a time history of interface contact force. Using this time history data as a load input, the finite difference softwareFLAC 3D was further employed to analyze the effect of a dynamic consolidation method on the typical soft-soil foundation. The effect on a single point tamped multiply was focused. Theresults show that with the increase of the tamping number, the tamping settlement increment is becoming smaller along with the total cumulative settlement increasing. A{ter tamped eighttimes, the total cumulative settlement increment approaches stable. Both excessive pore water pressure and vertical stress of soil have a half-spherical distribution. Along with the depth, thesevalues begin to gradually increase firstly and then gradually decrease. At the depth of about 5 m, the values of pore water pressure and vertical stress are already very small. Therefore, the mosteffective influence depth of this dynamic consolidation method is within about 5 m. The studyconclusion can provide a constructive reference for the relevant dynamic consolidation engineering application.