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Table 1 List of statistics of standard penetration test results

From: Investigation and analysis of groundwater-derived damage to the Shahe ancient bridge site in Xi’an, China

Layer order Layer name Number of tests Actual hammering number N (beat)
Minimum value Maximum value Average value Standard deviation Coefficient of variation
Fine sand 4 16.0 27.0 20.5 5.4 0.27
Medium sand 13 16.0 29.0 24.8 4.9 0.20
Gravel 2 29.0 31.0 30.0 1.4 0.05