膨胀土引起的地面上抬变形及在场地评估中的应用(英文)

Upheaval deformations of ground induced by expansive soils and application to site assessment

回顾了预示膨胀土引起的地面上抬变形的方法和含膨胀土层场地的评估。基于软化模型提出了一个地面上抬变形的计算方法及其公式。给出了确定半空间无限体中土单元在自重下的膨胀势的关系式。对该含膨胀土层的水平场地的地面上抬变形计算方法做了详细说明。对一个含高膨胀压力的膨胀土层的场地计算了地面上抬变形 ,以说明膨胀层位置及厚度对地面上抬变形的影响。最后 ,将该地面上抬变形方法应用于含膨胀土层场地的评估 ,并以例显示了膨胀土层厚度和位置对场地评估的重要影响。

In this paper, the methods of prediction of upheaval deformations of ground induced by expansive soils and the assessment of site including expansive soil layers are reviewed. A method of prediction of the upheaval deformations on the basis of soil softening is formulated. Relationships to determine swelling potential of soil element in half-space under self weight are presented. The computation method of upheaval deformations on horizontal ground including expansive soil layers is explained in details. A site including expansive soil layer with high swelling pressure is chosen to illustrate the influence of thickness and position of expansive soil layer on upheaval deformations. Finally, the computation method of upheaval deformations of ground is applied to assessment of sites including expansive soil layers, and important influence of thickness and position of expansive soil layer on site assessment is shown.