A sample of an undisturbed soil is cut and fit into a consolidometer ring and loads are applied progressively until about 200 kPa (4 kip/ft^2) is reached. At this pressure the specimen is flooded with water for saturation and left for 24 hours. The consolidation test is carried on to its maximum loading. The resulting e-log p curve plotted from the data obtained is shown in Fig. 18.4.
The collapse potential Cp is then expressed as
Figure 18.4 Typical collapse potential test result
Table 18.1 Collapse potential values
Jennings and Knight have suggested some values for collapse potential as shown in Table 18.1. These values are only qualitative to indicate the severity of the problem.