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Triggs Technologies Inc
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Send e-mail to hgardner@wojh.rr.com with questions or comments about this web site .
CORRELATIONS OF WILDCAT DYNAMIC CONE RESISTANCE WITH N-VALUES
Realizing that American engineers rely heavily upon test boring SPT N-values for the strength of subsoils, we correlated the dynamic cone resistances of our Wildcat dynamic cone penetrometer with test boring SPT N-values in sands, silts, and clays. To do this, we Wildcat tested locations adjacent to test borings, examined and tested the borings' soil samples for grain size, calculated the dynamic cone resistances at sample elevations, and compared the borings' N-values with the Wildcat's dynamic cone resistances.
The data of our study showed that the Wildcat dynamic cone penetrometer has a Q d /N ratio of approximately 3.5, in sands, silts, and clays, for dynamic cone resistances up to 90 Kg/cm 2. . For dynamic cone resistances above 90 Kg/cm 2 , the correlation breaks down so that we only know that the N-value exceeds 25.
As a result of this study, we incorporated an N / column into our logging software, which lists the correlation-derived SPT N-value of every 4 inch depth of tested soil. Where dynamic cone resistances exceed 90 Kg/cm 2 (and N / would be some unknown quantity above 25) our logging program prints a 25+ in the N / column. (Continued on Page 2)
By slightly modifying one typical rod and purchasing our torque wrench, RAP loggng program, and Reusable Adhesion Point (RAP), you can produce logs with dynamic cone resistances, SPT N-values, and soil types. YES!!! The RAP reusable adhesive point allows you to detect and log buried organic seams.
WE NOW HAVE INTRODUCED OPTIONAL "NEW-JOINT" RODS HAVING 3.5 TIMES MORE
MALE JOINT MOMENT OF INERTIA, TO REDUCE FRACTURING
Our new joint rods are stronger and less expensive than our original joint rods. New Wildcats are equipped with the new joint rods. Users of original joint rods can upgrade to new joint rods or continue to use the original joint rods. We stock and sell both types. Both rod sets are made from the same l.06" OD, drawn over mandrel, 75,000 psi yield strength steel. The catalog nuimbers of the new joint rods end in an N.
CORRELATIONS OF WILDCAT DYNAMIC CONE RESISTANCES WITH CBR
Our field testing has correlated Wildcat Dynamic Cone Resistances in Kg/cm² with CBR. A close approximattion of in-place CBR values of soil would be 0.170 times the stratum's dynamic cone resistance. When you use this correlation, keep in mind that in-place CBR's will change when moisture and compaction changes.