When you encounter a large, deep pile foundation, testing it with the CSL method requires testing and examining many profiles. A pile with six access tubes requires 15 profiles, and a pile with eight requires 28 profiles. The combinatorial formula is n*(n-1)/2. This can be a bit cumbersome to view and present to clients.
Thus, tomography can help, as it presents in 2D and better in three-dimensional (3D) a whole pile, and thus helps to zero in on a faulty profile in "one grasp."
Tomography also helps assess a specific pile location (slice) by calculating the "Effective Area." At Piletest, we calculate the effective area based on solid engineering knowledge using true 3D tomography.
A detailed paper on effective area as an assessment method can be found below.
Note: The 3D calculations engine comes at an extra cost, while 2D tomography is standard. We offer 3D tomography as a free service for initial tries. The 3D Tomography viewer is free and complements the CHUM basic package.
Below is the true 3D view of the CHUM 3DT viewer
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