塑料排水板加固软土地基的数值分析

主要对分层填筑情况下排水板处理的软土地基沉降进行数值模拟,分析荷载与沉降曲线关系,以便于工程应用。采用固结度等效原则,将砂井地基转换成平面应变有限元。对哈尔滨绕城高速公路软基路堤,利用ABAQUS有限元软件,进行二维有限元数值计算,并将模拟结果与监测数据进行对比,其吻合度较好。计算结果表明：排水板具有加快土体沉降,减少固结时间的作用;同时可为路面施工时间的确定提供依据,以保证试验路段的工后沉降满足设计要求。

Numerical Analysis on Soft Soil Foundation Consolidated by Plastic Drainage Board

The numerical value of soft soil foundation sedimentation consolidated by drainage board was simulated in layered architecture.The relation between the load and settlement curve was analyzed in order to make it convenient for engineering application.The equivalence principle of consolidation degree was adopted to transform the manhole foundation into the strain finite element on the plane.The finite element software ABAQUS was applied to conduct the numerical calculation of two-dimensional finite element against the soft base embankment of ring expressway in Harbin city.Comparing the simulation results with the monitoring data,the goodness of fit was just fine.The calculation results showed that the drainage board had the functions of accelerating the soil settlement and decreasing the consolidation time.Meanwhile,the basis for the determination on road construction time could be provided to ensure that the post construction settlement of the test section could meet the design requirements.