Oasys Suite Vdisp 是计算弹性土体在竖向载荷施加于矩形和圆形区域上时引起的法向位移和应力的专业软件，是预测多种基础荷载作用于不同土层时引起沉降变形的理想工具。

Vdisp calculates the vertical settlements (and stresses if required) within a layered elastic soil mass arising from vertical pressure loading applied to rectangular and circular loaded areas. The program is ideal for predicting the settlement that may arise due to the action of several foundation loads and gives the user an understanding of the settlement pattern likely to arise both beneath and beyond the loaded area being analysed.

The program assumes the soil is an elastic half-space when calculating the stress changes within the soil. Individual layer properties are used to calculate the vertical strain and the displacements resulting from these stresses. It effectively replaces the need for the engineer to use Newmark charts and other similar devices.

Program features include: loaded areas can be superimposed and can be specified to act at different levels a number of horizontal soil layers may be specified; the base of the bottom layer is assumed to be rigid a linear variation of modulus with level may be specified for each soil layer displacements and stresses may be specified for any soil layer analysis based on the equations of either Boussinesq or Mindlin.

An interactive link between Vdisp and the Oasys GSA structural analysis package is also available through a separate program (GSA Raft) for soil-structure interaction analysis of raft structures (e.g. basement slabs).