循环荷载作用下有无侧向约束复合地基沉降对比分析

Comparative Analysis on the Composite Foundation Settlement with and without Lateral Constraint under Cyclic Loading

为探讨循环荷载作用下有无侧向约束夯实水泥土桩复合地基的变形性状,进行了循环荷载作用下有无侧向约束夯实水泥土桩复合地基室内大比例模型对比试验,基于模型对比试验实测结果,分析了侧向约束对夯实水泥土桩复合地基变形性状的影响。结果表明:有侧向约束的夯实水泥土桩复合地基的沉降明显低于无侧向约束夯实水泥土桩复合地基的沉降。侧向约束对降低复合地基沉降的效果随着循环荷载比的增大而变得更加显著。因此,侧向约束对限制软土的侧向变形、降低复合地基的沉降具有良好的作用。

To exploring the deformation character of the composite foundation with and without lateral constraint rammed soil-cement piles under cyclic loading, large-scale indoor model comparative tests are performed. Based on the test results, influence of the lateral constraint on the deformation of the composite foundation is analyzed. It shows that the settlement of the composite foundation with lateral constraint rammed soil-cement piles is smaller than that without the lateral constraint. Effect of the lateral constraint to reduce settlement of composite foundation becomes more significant with the increase of cyclic load ratio. Therefore, the lateral constraint has good effect to restrict the lateral deformation of soft soil and reduce the settlement of composite foundation.