Built-in, automated quality assurance and quality control reporting includes capture of start and end positions, time and elevation as well as actual embedment depth, blow count
reporting, and inclination and orientation control.
During DPSH, blow count (N) necessary for a probe to penetrate an established depth interval (usually 20.
Influence of soil lateral friction with rods for the blow count
0 m depth influence of lateral fraction is not observed, blow count is very similar.
In DPSH of clay soils it has been noticed that in existence of indiscrete soil strata blow count rises together with the depth.
To evaluate the liquefaction potential of the soil layer, it appeared that the standard penetration test blow count
is the readily available parameter, and the simplified procedures proposed by Seed (1972) using blow count
number is widely accepted.
Similarly, corrected SPT blow count N can be obtained by substituting the values of M calculated from equation (2) and [?
The raw SPT blow count (N) values thus calculated are observed to be the same as those in the database (Fig.
Results of soil samples extracted from the 20-plus-foot depths required to comply with the specified cover tolerances of the project plan indicated a clean alluvial silt and alluvial grout with minimal blow counts
If someone is on your property who shouldn't be there, then the first blow counts
for a lot.
The most common deterministic procedure around the world for evaluating liquefaction resistance is "simplified procedure" developed originally by Seed and Idriss (1971) using blow counts
from the Standard Penetration Test correlated with a parameter called the cyclic stress ratio which represents the cyclic loading on the soil.
Each pipeline included the installation of approximately 600 linear feet of 30-inch RCP, through variable soil conditions from hard clays, with standard penetration blow counts
of over 50, to water-bearing sand pockets.