Geoscience Reference
In-Depth Information
3.5
Natural Sample
Mixture Oven Dried
Mixture Air Dried
3.0
2.5
2.0
1.5
1.0
0.5
0
5
10
15
20
Organic Content (%)
25
30
35
40
45
Figure 4.7
Unconfined compressive strength as a function of organic content for a natural soil and
soil-peat mixture (
after
Mitchell, 1993. This material is reproduced with permission of John
Wiley & Sons, Inc.).
Figure 4.8
Vane shear strength vs. degree of humification (
after
Al-Raziqi
et al.
, 2003).
Figure 4.7. It can be seen that the unconfined compressive strength decreases
significantly with increasing organic content.
Figure 4.8 shows the decreasing trend between the degree of humification and the
vane shear strength of peat. In general, fibric peat (H1-H3) has higher shear strength
