基于袋装砂井排水固结法处理软基的沉降过程流固耦合模拟

Fluid-solid coupling simulation of settlement process in soft ground based on drainage consolidation method with sand well

在软土分布地区,高速公路的"桥头跳车"、路面开裂等一直是困扰工程建设者的最主要问题,而对软土路基的沉降过程进行模拟预测则是其中的难点。利用改进的剑桥模型,采用FLAC3D有限差分软件,以珠江三角洲某高速公路试验段的地层数据进行袋装砂井排水固结法处理软土地基沉降过程的流固耦合模拟,通过模拟结果来对比实际检测的应力、应变情况。结果表明,表面沉降和分层沉降的模拟值与实测值能很好地吻合,模型能较为真实地反映路基沉降变形的实际情况。

The problems, such as pavement cracking, differential settlement between bridge and roadbed, are the most important matters that engineers must be up against. The simulation of soft ground settlement is one of the difficulties. This coupled simulation of seepage and consolidation mainly uses the improved Cambridge model, depends on the software FLAC^3D which is a finite difference software. As an example, the test sections＇ data of an expressway in the Pearl River Delta is used for simulating soft ground settlement, the accuracy of this modeling can be validated by contrasting between the results and actual monitoring data. The result shows that the simulating numerical values and the measured data has good match, whether for the surface settlement or for the stratified settlement, it means that the simulating model can be used to reflect the soft ground settlement.