Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
7.4.5. Estimated subsoil profile
Table 15: Zone factor Z value. Source: IS 1893 (Part 1) : 2002.
In order to develop an initial design for dredging works and foundations, a preliminary soil profile has been
estimated based on the site visits and the geological and geotechnical data given in 7.4.1.
The subsoil profile has been assumed as follows:
• Loose to medium dense sand from seabed to 5 m below seabed
• Medium to dense sand from 5 m to 15 m below seabed
• Moderately strong rock from 15 m below sea bed
Figure 114: Preliminary soil profile assumed for the feasibility design
It is important to clarify that this soil profile is only a preliminary estimation, and must be reviewed by a proper
geophysical and geotechnical study. Particularly, the field investigation shall include, at least, information from
side scan sonar, sub-bottom profiler, boreholes, soil samples and laboratory tests.
It is also important to note that the bedrock surface is expected to be uneven, since the weathering of gneiss
tends to create irregular profiles depending on the orientation and characteristics of the discontinuities. Among
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