粉喷桩处理高速公路软土地基地基内附加应力及沉降计算分析

考虑高速公路路基承受柔性荷载的特点，采用弹性力学中Mindlin解与Boussinesq解联合求解柔性荷载下粉喷桩复合地基中及复合地基下卧层土中应力及沉降。计算表明由于桩的作用，加固区的附加应力大大减少，而下卧层的附加应力有所增加，从而导致下卧层的沉降增大。将此方法计算沉降与工程中常用计算方法及实测结果比较，Mindlin解与Boussinesq解联合求解法与实测能较好吻合。

DJM Pile Treated Soft Clay Foundation on Express Highway The Analysis of the Additional Stress in Composite Foundation and the Settlement of Composite Foundation

Considering the characteristic of expressway bearing flexible load, using Mindlin solution and Boussinesq solution of the elastic mechanic, the additional stress and settlement of composite foundation are acquired. The calculating results indicate that the stress is largely decreased in composite foundation and increased below composite foundation because of the pile action, which results i n the increase of the settlement below composite foundation. Compared with the test results and the results of other calculating method, the results using above method are best agreement with the test resul ts.