In the construction project, foundation takes very important part. The main aim of the
foundation is to distribute the load from the upper structure to the ground layer under the
foundation. PT. Atlas Resources as a mining contractor has the project where located in the Siluq
Ngurai Village, West Kutai, East Kalimantan. The name of the project is Diva Kencana Borneo
Project which work on the coal mining. In coal mining, pile foundation can be used in the
conveyor. Conveyor is tool used for distribute coal from one place to another place.
In this final project, the author wants to redesign pile foundation using Cone Penetration
Test (CPT) data. There are a lot of method can be used to calculate the pile capacity. The CPT
data are calculated using three ways, first is direct calculation using The Dutch method,
Schmertmann’s method, and LCPC method; second is the calculation based on the soil properties
using α method, λmethod, and βmethod; and third is the calculation based on CPT – SPT
correlation using Meyerhof’s method and Briaud’s method.
Data analysis of those methods gives different result. All of the results of the analyses are
sufficient to resist the load that has to be carried by pile foundation. Maximum total load is not
more than 50 ton. The Dutch method, Schmertmann’s method, and LCPC method are the most
suitable methods for pile design. The calculation based on the soil properties using α method, λ
method, and βmethod give the highest value among the other methods. In this case, model
of the Su give big influence in the calculation. The calculation based on CPT - SPT correlation
using Meyerhof’s method and Briaud’s method give the smallest value among the other methods.
Conversion of the qc to the N value take important part in this section. The conversion can’t be
same interpret with the N value gotten directly from the field.